PM25 VRILE DISPLCEMENT PUMP CLOSED LOOP CIRCUIT T E C H N I C L C T L O G
PM25 - Variable displacement pump POCLIN HYDRULICS OVERVIEW PM25 is a variable displacement, axial piston pump, with swashplate system, for closed loop hydrostatic transmissions. It provides a continuously variable flow rate between zero and maximum in forward and reverse direction. Flow rate is proportional to rotation speed and swashplate angle. It can feature a charge pump to keep the circuit pressurised. This avoids risk of cavitations and ensures a good performance of the transmission. It offers several types of control: servo hydraulic, hydraulic automotive, direct or servo mechanical, electrical and electro-proportional. It is equipped with high pressure relief valves and can be delivered with auxiliary gear pumps. It is available in single or tandem versions. s options, PM25 can be featured with flushing valve, filter on charge pressure line and safety devices to ensure safe operation of the machine. Displacement Theoretical Flow at rated speed cm³/rev [in³/rev.] L/min [GPM] PM25-20 PM25-25 PM25-28 20,5 [1.25] 73,8 [19.50] 25,7 [1.57] 92,5 [24.44] Rated speed rpm 3 600 Rated pressure bar [PSI] 250 [3 625] Max. Pressure bar [PSI] 350 [5 076] Mounting flange Controls SE Hydraulic, hydraulic automotive, direct or servo mechanical, electrical, electro-proportional Mass kg [lb] from 13 [28.7] to 18 [39.7] Rotation Clockwise or Counterclockwise 28 [1.71] 100,8 [26.63] 2 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 CONTENT MODEL CODE 4 TECHNICL SPECIFICTIONS 6 Features 6 Main dimensions 7 Port characteristics 7 Model Code OPERTING PRMETERS 9 Operating parameters 9 Charge pressure 9 Case pressure 9 Pressure ratings 9 Speed ratings 9 Inlet pressure 10 Theoretical output 10 Poclain Hydraulics recommandations for fluid 10 Fluid and filtration 11 Viscosity range 11 SYSTEM DESIGN PRMETERS 12 Sizing equations 12 Redundant braking system requirement 12 Loop flushing 12 Reservoir 13 Case drain usage for tandem pump 13 Differential pressure 13 earing life and external shaft loading 14 Hydraulic unit life 15 Mounting flange loads 15 FETURES 16 High pressure relief valve 16 Charge relief valve 17 Charge pump 18 Displacement limiters 19 y-pass 19 Mounting flange and shafts 20 uxiliary mounting pad 22 Tandem pumps 24 Gear pumps 25 CONTROLS 26 Direct mechanical control 26 Mechanical servo control with feed back 28 Hydraulic servo control 30 Electrical on-off servo control 32 Electrico-proportional servo control 34 Hydraulic automotive control 36 OPTIONS 39 Roller bearing 39 Fluorinated elastomer seals 39 UNF threads ports 39 Filter on pressure line 40 External connections for filter 41 Pressure cut-off valve 41 Mechanical inching 42 Hydraulic inching 42 Neutral position switch 43 Flushing valve 44 Finishing coat 44 Customized identification plate 45 nti-stall valve 45 Technical specifications Operating System design Features Options Controls 29/05/2017 3
MODEL CODE PM25 - Variable displacement pump POCLIN HYDRULICS MODEL 1 2 3 4 5 6 1 Displacement cm 3 /rev [in 3 /rev] 20,5 [1.25] 20 25,7 [1.57] 25 28 [1.71] 28 2 Mounting flange and shaft SE ; z=13; 16/32 D.P. SE ; z=15; 16/32 D.P. SE ; Key shaft Ø 22,22 mm [dia. 0.87 in] Shaft for secondary tandem pump S3 S4 C3 T1 3 Control Direct mechanical control Mechanical servo control with feed back Hydraulic servo control Hydraulic automotive control 12V Hydraulic automotive control 24V Electrical on-off servo control with return spring without electrovalve Electrical on-off servo control with return spring and electrovalve 12V Electrical on-off servo control with return spring and electrovalve 24V Electrical on-off servo control without electrovalve Electrical on-off servo control with electrovalve 12V Electrical on-off servo control with electrovalve 24V Electro-proportional servo control 12V Electro-proportional servo control 24V M S D12 D24 00 12 24 C00 C12 C24 P12 P24 5 High pressure relief valve setting Max. system pressure bar [PSI] Without valve (only check valve) 00 150 [2 175] 15 200 [2 900] 20 250 [3 625] 25 300 [4 351] 30 350 [5 076] 35 4 Restrictor mm [in] Without restrictor 00 Ø 0,6 [dia. 0.023] 06 Ø 0,7 [dia. 0.027] 07 Ø 0,8 [dia. 0.031] 08 Ø 0,9 [dia. 0.035] 09 Ø 1,0 [dia. 0.039] 10 Ø 1,2 [dia. 0.047] 12 Restrictors can be assembled for controls type,, C, P, S, D. 6 Rotation Clockwise Counter clockwise R L 4 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 CODE 7 8 9 10 11 Model Code Technical specifications 7 Charge relief valve setting bar [PSI] Without charge relief valve 00 10 [145] (Only for control M) 10 22 [319] (For all controls) 22 8 Charge pump displacement cm 3 /rev [in 3 /rev] Without charge pump 00 9,1 [0.55] (For all auxiliary mounting pads) 08 12 [0.73] (For auxiliary mounting pad or S) 12 9 uxiliary mounting pad Without auxiliary mounting pad German group 2 flange SE flange; z = 9 Tandem (without charge pump) S G T 10 Gear pump cm 3 /rev [cu.in/rev] Without gear pump 00 German group 2 flange (if digit 9 = G) SE flange (if digit 9 = ) 4,0 [0.24] 04 6,0 [0.37] 06 8,5 [0.52] 08 11,0 [0.67] 11 14,0 [0.85] 14 16,5 [1.00] 17 19,5 [1.19] 20 4,0 [0.24] 04 6,0 [0.37] 06 8,5 [0.52] 08 11,0 [0.67] 11 14,0 [0.85] 14 16,5 [1.00] 17 19,5 [1.19] 20 22,5 [1.37] 22 26,0 [1.59] 26 11 Options Without option 00 Roller bearing CR Fluorinated elastomer seals EV Filter on pressure line without clogging indicator F0 Filter on pressure line with clogging indicator F2 External connections for filter F3 UNF Threads ports FU Mechanical inching for control D IC Hydraulic inching for control D HI Pressure cut-off valve LP Neutral position switch for control MI Flushing valve VS Finishing coat P Customized identification plate DP nti-stall valve SD Operating System design In case of request for a combination of several options, please contact your Poclain Hydraulics application engineer for further information. Features Options Controls 29/05/2017 5
PM25 - Variable displacement pump POCLIN HYDRULICS TECHNICL SPECIFICTIONS Features Displacement Theoretical flow at rated speed (3600 rpm) Max. Theoretical absorbed power at 320 bar [4 641 PSI] Theorical absorbed torque at 100 bar [1 450 PSI] Moment of inertia Internal charge pump Charge relief valve setting High pressure relief setting Mounting flange Mass cm³/rev [in³/rev.] L/min [GPM] PM25-20 PM25-25 PM25-28 20,5 [1.25] 73,8 [19.50] 25,7 [1.57] 92,5 [24.44] 28 [1.71] 100,8 [26.63] KW 39,4 49,3 53,8 N.m [in.lbf] kg.m² [slug.ft²] cm 3 /rev [in 3 /rev] bar [PSI] bar [PSI] kg [lb] 32,6 [288] 40,9 [362] 0.0014 [0.0010] 9,1 [0.55] or 12 [0.73] From 10 [145] to 30 [435] Max. 350 [5 076] SE 18 [39.7] with control M 22,2 [48.9] with controls,, C, P, S 24,7 [54.4] with control D 44,6 [395] 6 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Main dimensions PM 25 - SE - splined shaft with servo hydraulic control and without auxiliary mounting pad 1 2 3 4 5 6 7 8 9 10 11 S4 S Model Code 91 [3.58] 91 [3.58] 63 [2.48] 118 [4.65] +0 Ø 101,6-0.054 +0 [dia. 4.00-0.002 ] 0-0.05 0-0.002 9,5 [0.37 ] 88,5 [3.48] 26 [1.02] 26 [1.02] 35 [1.38] Clockwise (R) X Counter clockwise (L) 145 [5.71] 66,5 [2.62] Ø 15 [dia. 0.59] Technical specifications Operating 142 [5.59] 174 [6.85] 48 [1.89] 195 [7.68] 27 [1.06] 71 [2.79] 95 [3.74] 33 [1.30] 11,5 [0.45] View X System design 48 [1.89] 90,5 [3.56] 138 [5.43] 68,5 [2.70] 90 [3.54] 33 [1.30] 11,5 [0.45] 11 [0.43] 11 [0.43] 143,5 [5.65] 88,5 [3.48] 43 [1.69] Features Port characteristics M1 R G1 G2 M2 T2 T1 S Port Function ISO 1179-1 ISO 11926-1 (standard) (option FU) - Services 3/4 GS 1 1/6-12-UNF G1/G2 uxiliary 1/4 GS 9/16-18-UNF M1/M2 - pressure 1/4 GS 9/16-18-UNF / Servo control pilot 1/4 GS 9/16-18-UNF R Servo pilot pressure 1/4 GS - S Suction 3/4 GS 1 1/6-12-UNF T1/T2 Drain 1/2 GS 3/4-16-UNF Options Controls 29/05/2017 7
PM25 - Variable displacement pump POCLIN HYDRULICS 8 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 OPERTING PRMETERS Operating parameters Model Code Speed ratings System pressure Inlet pressure Case pressure Charge pressure Servo case pressure PM25-20 PM25-25 PM25-28 Minimum 700 Max. without load min -1 (rpm) 3 900 Max. with load 3 600 Rated 250 [3 625] Maximum bar [PSI] 370 [5 366] Minimum low loop 10 [145] Mini continuous bar (abs.) 0,8 [11.6] Mini (cold start) [PSI abs.] 0,5 [7.2] Continuous 1,5 [21.7] bar [PSI] Maximum (cold start) 2,5 [36.2] Standard version 10 [145] for control M; 22 [319] for other controls Max. charge pressure bar [PSI] 30 [435] Maximum bar [PSI] 30 [435] Technical specifications Operating Charge pressure charge flow is required to maintain a positive pressure in the low pressure loop of a closed loop hydrostatic transmission. Charge pressure ensures proper lubrication and rotating group operation. It is recommended to maintain the charge pressure at a minimum of 10 bar [145 PSI] above case pressure. For more details, refer to charge pump paragraph, page 18. Case pressure Case pressure must be maintained within the limits shown in the table ''Operating parameters''. Ensure housing is always filled with hydraulic fluid and especially during start-up of the machine. System design Pressure ratings Maximum peak pressure It is the maximum allowable pressure. It is equivalent to the maximum setting of the maximum high pressure relief valve. self-propelled machine can reach the maximum peak pressure value no more than 1-2% of that work cycle. Features Work cycle fundamental factor for ensuring correct hydrostatic transmission sizing is the machine work cycle (pressure-time ratio, seasonality, pressure vs. percentage of time at max. displacement, machine type). Part service life depends on the correct choice in relation to the work cycle. Overloads It is mandatory to protect parts against any possible overloads. Speed ratings The table ''Operating parameters'' gives minimum and maximum rated speeds. Note that all displacements might operate under different speed limits. Definitions of these speed limits appear below. Maximum speed is the highest operating speed allowed. Over speeding reduces pump life time, can lead to loss of hydrostatic power and braking capacity. Never exceed the maximum speed limit under any operating conditions. Nominal speed is the speed offering the maximal efficiency. Options Controls 29/05/2017 9
PM25 - Variable displacement pump POCLIN HYDRULICS Inlet pressure Charge pump inlet pressure is key for acceptable pump life and performances. continuous inlet pressure of not less than 0,8 bar abs. [11.6 PSI abs.] is recommended. continuous inlet pressure less than 0.5 bar abs. [7.2 PSI abs.] indicates inadequate inlet design or a restricted filter. Pressures less than 0.5 bar abs. [7.2 PSI abs.] can happen at cold start, but should increase with oil temperature. Theoretical output Theoretical output flow is a function of pump displacement and speed. It is relevant to size the rest of the circuit. Theoretical flow does not take into account losses due to leakage or variations in displacement. Refer to performances, page 6, for volumetric and overall efficiencies at various operating speeds and pressures. Poclain Hydraulics recommandations for fluid Poclain hydraulics recommends the use of hydraulic fluids defined by the ISO 15380 and ISO 6743-4 standards. For temperate climates, the following types are recommended. HM 46 or HM 68 for fixed installations. HV 46 or HV 68 for mobile installations. HEES 46 for mobile installations. These specifications correspond to category 91H of the CETOP standard, parts 1, 2 and 3 of the DIN 51524 standard, and grades VG32, VG 46 and VG68 of the ISO 6743-4 standards. It is also possible to use TF, HD, HF, HFC or HFD type hydraulic fluid upon Poclain Hydraulics specific approval of the components operating conditions. Standardized designations for the fluids HM : Mineral fluids having specific antioxidant, anticorrosion and antiwear properties (HLP equivalent to DIN 51524 parts 1 and 2). HV : HM mineral fluids providing improved temperature and viscosity properties (DIN 51524 part 3). HEES :iodegradable fluids based on organic esters. It is also possible to use a fluid that meets the biodegradability criteria and is compatible in the event of accidental food contact. The IOHYDRN FG 46 fluid designed by the company Total has undergone testing of its properties and performance on our test benches. Since this type of fluid has not yet been categorized, it is the responsibility of machine manufacturers to validate its compatibility with all of the components used in order to guarantee that the intended functions will be fulfilled and this for the desired life time of all equipment items. For biodegradable fluids, consult your Poclain Hydraulics application engineer During operation, the temperature of the oil must be between 0 C [32 F] and 80 C [176 F]; the minimum and maximum temperatures may be exceeded momentarily by ± 20 C [± 68 F] for a duration of less than 30 minutes. For all applications outside these limits, please consult with your Poclain Hydraulics application engineer. 10 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Fluid and filtration The contaminating particles suspended in the hydraulic fluid cause the hydraulic mechanisms moving part wear. On hydraulic pumps, these parts operate with very small dimensional tolerances. In order to reach the part life, it is recommended to use a filter that maintains the hydraulic fluid contamination class at a max. of: Model Code 9 according to NS 1638 22/18/13 according to ISO 4406:1999 ccording to the type of application decided for the pump, it is necessary to use filtration elements with a filtration ratio of: 20 to 30 100 Making sure that this ratio does not worsen together with the increasing of the filter cartridge differential pressure. If these values cannot be observed, the component life will consequently be reduced and it is recommended to contact the Poclain Hydraulics Customer Service. Filters on charge circuit Filters on the charge circuit (F0-F2) are designed without by-pass. The max. pressure drop on the filtration part must not exceed 2 bar [29 PSI] (3 bar [43.5 PSI] in case of cold starting) at pump full rating. To monitor the pressure drop, It is recommended to use the clogging indicator on the filtration element (F2 option). Contact your Poclain Hydraulics pplication engineer, each time the pump is not charged by its internal charge pump. Filters on charge circuit are mounted on the pump special support. Filters assembling The suction filter is mounted on the suction line. Check that the pressure before the charge pump is 0.8 bar abs. [11.6 PSI abs.], measured on the pump suction port (0.5 bar [7.2 PSI] for cold starting). Technical specifications Operating Viscosity range For both max. efficiency and life of the unit, the operative viscosity should be chosen within the optimum range of: opt = optimum operating viscosity from 16 to 36 mm 2 /s [from 74.1 to 166.8 SUS] referred to the closed loop temperature. Working conditions: the following limits of viscosity apply min = 5 mm 2 /s [23 SUS] short-duration at a max. permissible leakage oil temperature of 90 C [194 F] max = 1000 mm 2 /s [4 634 SUS] short-duration, on cold start. mm 2 /s For brief instants during the cold starting [SUS] System design 1600 1000 600 400 200 100 60 40 20 10 VG 32 VG 22 VG 46 VG 68 VG 100 Optimum viscosity 5 23-40 -25-10 0 10 30 50 70 90 115 C -40-13 14 30 86 122 158 194 239 [ F] Hydraulic fluid temperature range 7414 4634 2780 1854 927 463 278 185 93 46 For brief instants with leakage oil at 90 C Features Options Controls Ensure fluid temperature and viscosity limits are concurrently satisfied. 29/05/2017 11
PM25 - Variable displacement pump POCLIN HYDRULICS SYSTEM DESIGN PRMETERS Consult your Poclain Hydraulics application engineer to validate your design parameters before using the pump in your application. Sizing equations The following equations are helpful when sizing hydraulic pumps. Generally, the sizing process is initiated by an evaluation of the machine system to determine the required motor speed and torque to perform the necessary work function. First, the motor is sized to transmit the maximum required torque. The pump is then selected as a flow source to achieve the maximum motor speed. V g.n. v Output flow Q = (l/min) 1000 SI units US units Input torque M = V g. p 20.. m (N.m) Input power P = M. n. Q. p = 30 000 600. t (kw) Output flow Q = V g.n. v 231 [GPM] Input torque M = V g. p 2.. m [lbf.in] M.n. Q. Input power P = = p [hp] 198 000 1714. t V g =Displacement per revolution cm 3 /tr [in 3 /rev] p = p o - p i (system pressure) bar [PSI] n = Speed min -1 [rpm] v = Volumetric efficiency m = Mechanical efficiency t = Overall efficiency ( v. m) Redundant braking system requirement Unintended vehicle or machine movement hazard. The loss of hydrostatic drive line power, in any mode of operation (forward, neutral, or reverse) may cause the system to lose hydrostatic braking capacity. You must provide a braking system, redundant to the hydrostatic transmission, sufficient to stop and hold the vehicle or machine in the event of hydrostatic drive power loss. Loop flushing Closed circuit may require a flushing valve to meet temperature and cleanliness requirements. flushing valve takes a part of hot fluid flow from the low pressure loop of the system loop for cooling and filtering. Make sure that the charge pump provides adequate flow for the flushing valve flushing and the flushing valve does not cause charge pressure to drop below recommended limits.. M1G1 G2 R M2 See option VS page 44 for more information T1 T2 S 12 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Reservoir The reservoir provides clean fluid, dissipates heat, and removes entrained air from the hydraulic fluid. It allows for fluid volume changes associated with fluid expansion and cylinder differential volumes. Minimum reservoir capacity depends on the volume needed to perform these functions. Typically, a capacity of one half the charge pump flow (per minute) is satisfactory for a closed reservoir. Open circuit systems sharing a common reservoir require greater fluid capacity. Model Code Locate the reservoir outlet (suction line) near the bottom, allowing clearance for settling foreign particles. Use a 100-125 μm screen covering the outlet port. Place the reservoir inlet (return lines) below the lowest expected fluid level, as far away from the outlet as possible. Use a baffle (or baffles) between the reservoir inlet and outlet ports to promote de-aeration and reduce fluid surging. Case drain usage for tandem pump Technical specifications On tandem pumps, and to ensure lubrification of both pumps, excess flow from the second pump charge relief valve must be routed into the housing of the first pump. -1-1 M1-1 G1-1 R-1 M2-1 -1-2-2 M1-2 G1-2 G2-2 R-2 M2-2 -2 Operating T -1 S -2 System design Differential pressure The differential pressure is the High pressure relief valve setting minus Charge relief valve setting. M1 G1 G2 R M2 High pressure relief valve setting = Max. system pressure Features Differential pressure T1 T2 S Charge relief valve setting Options Controls 29/05/2017 13
PM25 - Variable displacement pump POCLIN HYDRULICS earing life and external shaft loading earing life: earing life is a function of speed, pressure, swashplate angle and external loads. Oil type and viscosity impact bearing life. earing life ( 10 hours) PM25-28 12 900 Normal bearing life in 10 hours is shown in the above table. Figures have been calculated under the following operating conditions : a continuous differential pressure of 130 bar [1 885 PSI], 1 800 rpm shaft speed, maximum displacement, without any external shaft side load. The data is based on a 50% forward, 50% reverse duty cycle, standard charge pump size, and standard charge pressure. Shaft Loads: PM25 pumps are designed with bearings that can accept external radial and thrust loads. The external radial shaft load limits depend on the load position, orientation, and operating conditions of the unit. The maximum permissible radial load (Re), is based on the maximum external moment (Me), and the distance (L) from the mounting flange to the load. It may be determined using the table and formula below. Thrust (axial) load limits are also shown. Re = Me / L ll external shaft loads affect bearing life. In applications with external shaft loads, minimize the impact by positioning the load at 90 or 270 as shown in the figure. Contact your Poclain Hydraulics representative for an evaluation of unit bearing life if: Continuously applied external loads exceed 25 % of the maximum allowable radial load Re. The pump swashplate is positioned on one side of center all or most of the time. The unit bearing life ( 10 ) is critical. External moment (Me) N.m [in.lbf] Maximum shaft thrust in (T in ) N [lbf] PM25-28 44 [389] 1 000 [224.8] at 120 bar [1 740 PSI] and 3 600 rpm Radial and thrust load position L 0 Re End view of shaft Re 90 Re 270 Re Tout Tin xis of swashplate rotation 180 Re For an accurate calculation, consult your Poclain Hydraulics application engineer. 14 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Hydraulic unit life Hydraulic unit life is the life expectancy of the hydraulic components. It depends on speed and system pressure even if, system pressure is the dominant operating variable. High pressure, generated by high load, reduces hydraulic unit life. Design the hydraulic system according to the expected machine duty cycle. Take in consideration the expected percentages of time at various loads and speeds. sk your Poclain Hydraulics representative to calculate an appropriate pressure based your hydraulic system design. If duty cycle data is not available, input power and pump displacement are used to calculate system pressure. Model Code ll pressure limits are differential pressures (referenced to charge pressure), taking a normal charge pressure in consideration. PM25 pumps will meet satisfactory life expectancy if applied within the parameters specified in this technical documentation. For more detailed information on hydraulic unit life see Operating in page 9. Mounting flange loads dding tandem mounted pumps, and/or tandem auxillary pump(s), subjecting pumps to shock loads may generate excessive loads on the front mounting flange. The overhung load moment for multiple pump mounting can be estimated as shown in the figure bellow Technical specifications Overhung load example Mounting flange CG pump 1 uxiliary pad CG pump 2 Operating L1 L2 System design Estimating overhung load moments W = Weight of pump (kg) L = Distance from mounting flange to pump center of gravity (CG) M R = G R (W 1 L 1 + W 2 L 2 +... + W n L n ) M S = G S (W 1 L 1 + W 2 L 2 +... + W n L n ) Features Where: M R = Rated load moment (N.m) M S = Shock load moment (N.m) G R *= Rated (vibratory) acceleration (G s) (m/sec²) G S *= Maximum shock acceleration (G s) (m/sec²) *Calculations will be carried out by multiplying the gravity (g = 9.81 m/sec²) with a given factor. This factor depends on the application. llowable overhung load moment are shown in the above table. Exceeding these values requires additional pump support. Rated moment (MR) N.m [in.lbf] Shock load moment (MS) N.m [in.lbf] PM25-20 370 [3 274] 600 [5 310] PM25-25 370 [3 274] 600 [5 310] PM25-28 370 [3 274] 600 [5 310] For an accurate calculation, consult your Poclain Hydraulics application engineer. Options Controls 29/05/2017 15
PM25 - Variable displacement pump POCLIN HYDRULICS FETURES High pressure relief valve The high pressure relief valves maintain circuit pressure in the proper range. The check valves allow charge flow to replenish the low pressure loop of the circuit. The high pressure relief valves ensure a high pressure protection of the high pressure loop of the circuit. High pressure relief valves are available in a range of settings. When high pressure relief valves are not desired, pumps is equipped with charge circuit check valves only. High pressure relief valves are intended for transient overpressure protection and are not intended for continuous pressure control. Flow over relief valves for extended periods of time may result in severe heat build up. High flows over relief valves may result in pressure levels exceeding the nominal valve setting and potential damage to system components. 1 2 3 4 5 6 7 8 9 10 11 High pressure relief valve vailable setting bar [PSI] Without - 00 M1G1 G2 R M2 150 [2 175] 15 With 200 [2 900] 20 250 [3 625] 25 T1 T2 S 300 [4 351] 30 350 [5 076] 35 High pressure relief valve ISO VG46 hydraulic fluid at 50 C [122 F] 400 bar PSI 5 801 Pressure 300 200 4 351 2 900 100 1 450 0 25 50 75 100 L/min 6.6 13.2 19.8 26.4 GPM Flow The high pressure relief valve setting is not the differential pressure between and ports (see page 13). 16 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Charge relief valve The charge pressure relief valve provides a relief outlet for charge circuit. This valve is used to set the charge pressure of the circuit. Flow through the valve is ported to case. The nominal charge relief setting is referenced to case pressure. Model Code Incorrect charge pressure settings may result in the inability to build required system pressure and/or inadequate loop flushing flows. Ensure correct charge pressure under all conditions of operation to maintain pump control performance. 1 2 3 4 5 6 7 8 9 10 11 Operating Technical specifications Charge relief valve vailable setting bar [PSI] M1G1 G2 R M2 Without - 00 With Only for control M 10 [145] 10 For all controls 22 [319] 20 T1 T2 S System design Charge relief valve Features bar ISO VG46 hydraulic fluid at 50 C [122 F] PSI Pressure difference 30 25 20 15 10 5 0 435 362.6 290 217.5 145 72.5 0 500 1000 1500 2000 2500 3000 Pump speed (rpm) Options Controls 29/05/2017 17
PM25 - Variable displacement pump POCLIN HYDRULICS Charge pump Charge flow is required on all PM25 pumps used in closed circuit installations. The charge pump provides flow to make up internal leakage, maintain a positive pressure in the main circuit, provide flow for cooling and filtration, replace any leakage losses from external valving or auxiliary systems, and to provide flow and pressure for the control system. Many factors influence the charge flow requirements. These factors include system pressure, pump speed, pump swashplate angle, type of fluid, temperature, size of heat exchanger, length and size of hydraulic lines, control response characteristics, auxiliary flow requirements, hydrostatic motor type, etc. Unusual application conditions may require a more detailed review of charge pump sizing. Charge pressure must be maintained at a specified level under all operating conditions to prevent damage to the transmission. Poclain Hydraulics recommends testing under actual operating conditions to verify this. M1G1 G2 R M2 T1 T2 S Charge pump sizing/selection In most applications a general guideline is that the charge pump displacement should be at least 20% of the main pump displacement. 1 2 3 4 5 6 7 8 9 10 11 Charge pump Displacement cm³/rev [in³/rev] Rated speed rpm Without - - 00 With For all auxiliary mounting pads Only auxiliary mounting pad 9,1 [0.55] 3900 08 12 [0.73] 3900 12 Contact your Poclain Hydraulics application engineer for more information. 18 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Displacement limiters PM25 are designed with mechanical displacement (stroke) limiters. You can limit maximum displacement of the pump to a certain percent of its maximum displacement to near zero in both direction. The displacement limiters are located on the both sides of the servo piston and are adjustable by screw. Model Code Take care in adjusting displacement limiters to avoid an undesirable condition of output flow or speed. Retorque the sealing lock nut after every adjustment to prevent an unexpected change in output conditions and to prevent external leakage during pump operation. PM25 with control M Max. displacement adjustement PM25 with other controls Max. displacement adjustement Technical specifications Operating Max. displacement adjustement Neutral position adjustement Max. displacement adjustement System design y-pass PM25 features a by-pass function. y-passing Port and Port is achieved by unscrewing a screw located on the cover. The by-pass connect the ports - and must be use only in emergency case and only for short movement. Features M1G1 G2 R M2 T1 T2 To avoid leakage, do NOT exceed two turns of the screw. y-pass valve is intended for moving a machine for very short distances at very slow speeds. It is NOT intended as tow valve. S Options Controls 29/05/2017 19
PM25 - Variable displacement pump POCLIN HYDRULICS Mounting flange and shafts SE - Splined shaft 1 2 3 4 5 6 7 8 9 10 11 S3 13 teeth Max. torque: 220 Nm [1947 in.lbf] 10 [0.39] 31 [1.22] Splined NSI 92.1a-1996 Pitch 16/32 DP Pressure angle 30 Tolerance class: 5 +0-0.054 Ø 101,6 +0 [dia. 4.00-0.002 ] M6 16 [0.63] 20 [0.79] 41 [1.61] 9.5 0-0.05 S4 15 teeth Max. torque: 360 Nm [3186 in.lbf] 8 [0.31] 38 [1.50] Ø 101,6 [dia. 4.00 ] +0-0.054 +0-0.002 M6 16 [0.63] 25 [0.98] Splined NSI 92.1a-1996 Pitch 16/32 DP Pressure angle 30 Tolerance class: 5 46 [1.81] 9.5 0-0.05 20 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 SE - Key shaft C3 1 2 3 4 5 6 7 8 9 10 11 Model Code Ø = 22,22 mm [dia. 0.87 in] Max. torque: 220 Nm [1947 in.lbf] 8 [0.31] 33 [1.30] Technical specifications +0-0.054 Ø 101,6 +0 [dia. 4.00-0.002 ] Operating 4,5 [0.18] 25 [0.98] System design Options Controls 25,08 [0.99 ] Features 0-0.2 0-0.08 M8 19 [0.75] 6,35 [0.25 ] +0.000-0.036 +0.000-0.001 +0.000-0.013 Ø 22,22 +0.000 [dia. 0.87-0.0005 ] 41 [1.61] 9.5 0-0.05 29/05/2017 21
PM25 - Variable displacement pump POCLIN HYDRULICS uxiliary mounting pad SE flange 1 2 3 4 5 6 7 8 9 10 11 00 Without charge pump 8 With charge pump: 9,1 cm 3 /rev [0.55 in 3 /rev] 12 With charge pump: 12,0 cm 3 /rev [0.73 in 3 /rev] Max. Torque: 80 N.m [708 in.lbf] Splined NSI 92.1a-1996 Pitch 16/32 DP Pressure angle 30 9 teeth Tolerance class: 5 33,5 [1.32] 20 [0.79] 130,4 [5.13] Ø 106,4 [dia. 4.19] 4 x M10 201 [7.91] 8 [0.31] 35 [1.38] +0.071 Ø 82,55 +0.036 [dia. 3.25 ] +0.003 +0.001 Do not rotate the auxiliary mounting pad cover. 22 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 German group 2 flange 1 2 3 4 5 6 7 8 9 10 11 G Model Code 00 Without charge pump 08 With charge pump: 9,1cm 3 /rev [0.55 in 3 /rev] Max. torque: 48 N.m [425 in.lbf] Technical specifications 14,5 [0.57] 60 [2.36] +0.000 Ø 52 +0.030 100,4 [3.95] 60 [2.36] [dia. 2.04 ] +0.000 +0.001 Operating 115,4 [4.54] 30 [1.18] 205 [8.07] 6,5 [0.25] 2,5 [0.10] 8 [0.31] 39 [1.53] -0.025-0.061 8 [0.31 ] -0.001-0.002 System design 8 x M10 18 [0.71] Splined NSI 92.1a-1996 Pitch 16/32 DP Pressure angle 30 9 teeth Tolerance class: 5 Features Do not rotate the auxiliary mounting pad cover. Options Controls 29/05/2017 23
PM25 - Variable displacement pump POCLIN HYDRULICS Tandem pumps Max. torque intermediate coupling 200 N.m [1 770 in.lbf] Front axial pump Rear axial pump Next pump M e imput torque M e1 for the first pump M e2 for the second pump M e3 for the next pump Torque required by auxiliary pumps is additive. Ensure requirements don t exceed shaft torque ratings. Front axial pump Rear axial pump + 1 2 3 4 5 T1 6 7 8 9 10 11 00 T Number of charge pump in the tandem 0 charge pump xial pump Front Rear Mounting flange and shaft SE ; 13 teeth SE ; 15 teeth Shaft for secondary tandem pump S3 S4 Charge pump uxiliary mounting flange Without 00 Tandem fitting T T1 Without 00 SE flange Without auxiliary mounting pad S 1 charge pump* Front Rear SE ; 13 teeth SE ; 15 teeth Shaft for secondary tandem pump S3 S4 T1 Without 00 Tandem fitting T With 08 or 12 SE flange Without auxiliary mounting pad S * The charge pump can only be located on the rear axial pump. Ports T and G of the first pump must be connected with ports T and G of the second pump. 24 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25-1 -1 M1-1 G1-1 R-1 M2-1 -1-2-2 M1-2 G1-2 G2-2 R-2 M2-2 -2 Model Code T Gear pumps -1 1 2 3 4 5 S -2 6 7 8 9 10 11 Technical specifications uxiliary mounting pad Displacement Pressure Dimension Mass Efficiency Continuous max. pressure Gear pump Max. intermittent pressure Max. peak pressure C Operating cm 3 /rev [cu.in/rev] bar [PSI] bar [PSI] bar [PSI] mm [in] mm [in] mm [in] Kg [lb] % G German group 2 04 06 08 11 14 4 [0.24] 6,0 [0.37] 8,5 [0.52] 11,0 [0.67] 14 [0.85] 250 [3 625] 250 [3 625] 250 [3 625] 250 [3 625] 250 [3 625] 270 [3 915] 270 [3 915] 270 [3 915] 270 [3 915] 270 [3 915] 290 [4 205] 290 [4 205] 290 [4 205] 290 [4 205] 290 [4 205] 90,3 [3.55] 93,6 [3.68] 97,8 [3.85] 101,9 [4.01] 106,9 [4.21] 88 [3.46] 100 [3.94] 2,30 [5.07] 2,45 [5.40] 2,60 [5.73] 2,70 [5.95] 2,80 [6.17] 95* System design C 17 16,5 [1.01] 230 [3 335] 240 [3 480] 250 [3 625] 111,1 [4.37] 2,95 [6.51] 20 04 19,5 [1.19] 4 [0.24] 210 [3 045] 250 [3 625] 220 [3 190] 270 [3 915] 230 [3 335] 290 [4 205] 116,1 [4.57] 93,0 [3.66] 3,10 [6.84] 2,30 [5.07] Features SE flange 06 08 6,0 [0.37] 8,5 [0.52] 250 [3 625] 250 [3 625] 270 [3 915] 270 [3 915] 290 [4 205] 290 [4 205] 96,3 [3.68] 100,5 [3.96] 2,45 [5.40] 2,60 [5.73] 11 11,0 [0.67] 250 [3 625] 270 [3 915] 290 [4 205] 104,6 [4.12] 2,70 [5.95] C 14 17 20 22 26 14 [0.85] 16,5 [1.01] 19,5 [1.19] 22,5 [1.37] 26 [1.59] 250 [3 625] 230 [3 335] 210 [3 045] 190 [2 755] 170 [2 465] 270 [3 915] 240 [3 480] 220 [3 190] 200 [2 900] 180 [2 610] 290 [4 205] 250 [3 625] 230 [3 335] 210 [3 045] 190 [2 755] 109,6 [4.21] 113,8 [4.37] 118,8 [4.68] 123.8 [4.87] 129,6 [5.10] Gear pumps are always delivered flanged on the axial pump. They can not be sold alone. 130,4 [5.13] 95 [3.74] 2,80 [6.17] 2,95 [6.51] 3,10 [6.84] 3,25 [7.17] 3,40 [7.50] 95* * Value collected during the testing at 1500 rpm Options Controls 29/05/2017 25
PM25 - Variable displacement pump POCLIN HYDRULICS CONTROLS Direct mechanical control 1 2 3 4 5 M 6 7 8 9 10 11 The variation in pump displacement is obtained by rotating the lever shaft in a clockwise or counter-clockwise direction. The lever shaft is directly linked to the pump swashplate. The angle is at 15 for 20,5 cm 3 /rev [1.25 in 3 /rev] displacement and at 18 for 25,7 cm 3 /rev [1.57 in 3 /rev]. M1G1 G2 R M2 Flow rate determination Rotation Control Output Input Clockwise (R) X Y Counter clockwise (L) X Y T1 T2 S X Y 100% displacement cm 3 /rev [in 3 /rev] X/Y angle 20,5 [1.25] 13,5 25,7 [1.57] 17 28 [1.71] 18,5 Control shaft torque at 3000 rpm Control shaft torque at 1500 rpm N.m [in.lbf] N.m [in.lbf] 30 265.5 30 265.5 20 200 bar [2 900 PSI] 177 20 200 bar [2 900 PSI] 177 10 100 bar [1 450 PSI] 88.5 10 100 bar [1 450 PSI] 88.5 0 0 25 50 75 100 0 0 25 50 75 100 The spring return feature in the control unit is not a safety device. 26 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Dimensions Ø 18 [dia. 0.71] Ø 6 [dia. 0.24] System design Model Code Operating Features Options Controls 63 [2.48] 103 [4.05] 93,5 [3.68] 85 [3.35] Technical specifications See page 7 for other dimensions and port characteristics. 60,5 [2.38] 29/05/2017 27
PM25 - Variable displacement pump POCLIN HYDRULICS Mechanical servo control with feed back 1 2 3 4 5 6 7 8 9 10 11 The variation in pump displacement is obtained by rotating the drive lever situated on the servo control. n internal channel, linked to the charge pump, feeds a hydraulic servo valve which supplies oil into the cylinder which is in turn linked to the pump swashplate. The maximum rotation of the Iever, with respect to 0 is 42,5 for both rotation directions; thus permitting the optimum control of the displacement. t every lever angle there is a corresponding pump displacement. On the (T) return arm of the rotating distributor a restrictor (Rs) is mounted which regulates the servo control shifting speed, thus avoiding sudden accelerations and stoppages. The effort of moving the lever is independent of the pressure and rpm. Flow rate determination Rotation Control Output Input Clockwise (R) X Y Counter clockwise (L) X Y Rs M1G1 G2 R M2 To prevent damage to the control a positive mechanical stop must be provided for the control linkage. T1 T2 S N.m Control lever torque vs Control lever rotation [in.lbf] 3 26.5 2 17.7 X 42,5 max. 1 8.85 0 0-1 -8.85 Y 42,5 max. -2-3 -40-30 -20-10 0 10 20 30 40-17.7-26.5 Control shaft rotation (degrees) The spring return feature in the control unit is not a safety device. 28 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Dimensions 26 [1.02] 0 Ø 12-0.05 0 [dia. 0.47-0.002 ] 3 x Ø 9 [dia. 0.35] Model Code Restrictor System design Options Controls Operating Technical specifications 50,5 [1.99] 45 [1.77] 48 [1.89] Features 166 [6.53] 132,5 [5.21] 3 [0.12] 123,5 [4.86] See page 7 for other dimensions and port characteristics. 21,5 [0.85] 15 [0.59] 48 [1.89] 90,5 [3.56] 29/05/2017 29
PM25 - Variable displacement pump POCLIN HYDRULICS Hydraulic servo control 1 2 3 4 5 S 6 7 8 9 10 11 The variation in pump displacement is obtained by adjusting the pressure on the and servo control connections by means of a hydraulic proportional joystick (containing pressure reduction valves). The joystick supply can by obtained by taking pressure from the auxiliary pump (G connection). The servo control response time can be adjusted by inserting a restrictor on the joystick supply line (from 0.6 to 1,2 mm [from 0.02 to 0.05 in] or between the joystick and servo piston of the pump. The servo control operation curve in both control directions goes from 6 to 15 bar [from 87 to 217 PSI]. The adjustment curve of the hydraulic control system has to be wider (from 5 to 16 bar [from 72.5 to 232 PSI]). Restrictors M1G1 G2 R M2 Flow rate determination Rotation Pressure Output Input Clockwise (R) Counter clockwise (L) T1 T2 S 20 bar [PSI] 290 15 217.5 10 145 5 72.5 0 50 Pump displacement (%) 100 The spring return feature in the control unit is not a safety device. 30 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Dimensions Restrictor 91 [3.58] 91 [3.58] Model Code 48 [1.89] Options Controls Operating 118 [4.65] Technical specifications 10 [0.39] System design Features 48 [1.89] See page 7 for other dimensions and port characteristics. 90,5 [3.56] 29/05/2017 31
PM25 - Variable displacement pump POCLIN HYDRULICS Electrical on-off servo control Control with return spring 1 2 3 4 5 6 7 8 9 10 11 The reaching of the maximum displacement in a time defined by the restrictors (Rs) which are positioned between the electrovalve and the (T) drain is obtained by the continuous starting of an ON-OFF electrovalve with an open-circuit CETOP 3 connection. If the electro-valve motion is stopped, the pump goes back to 0 position thanks to the servo control springs. Supply voltage Without 12V 24V 00 12 24 t a b p Rs M1 G1 T1 T2 S EV2 Rs Rs EV1 Rs M1 G1 G2 R G2 R M2 M2 The pump can be supplied either without electrovalve (00) or with electrovalve (12, 24 ). T1 T2 S Control without return spring 1 2 3 4 5 6 7 8 9 10 11 The variation in pump displacement is obtained by the energizing of an ON-OFF electrovalve with a closed center CETOP 3 connection. The displacement reached is in relation to the starting time of the electro-valve and to the diameter of the restrictors (Rs) which are placed between the electrovalve and the drain (T). Supply voltage Without 12V 24V C00 C12 C24 t a b p Rs M1 G1 T1 T2 S EV2 Rs EV1 G2 R M2 The pump can be supplied either without electrovalve (C00) or with electrovalve (C12, C24). Rs Rs M1 G1 G2 R M2 The servo control is without springs and the setting of the pump at a certain displacement is guaranteed by the closed center of the electrovalve. T1 T2 S Flow rate determination Rotation Control Pressure Output Input Clockwise (R) EV1 EV2 Counter clockwise (L) EV1 EV2 The spring return feature in the control unit is not a safety device. 32 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Dimensions 38,5 [1.51] Restrictor 95 [3.74] EV1 95 [3.74] EV2 Model Code Restrictor Options Controls Operating 175,5 [6.91] 164,4 [6.47] 95 [3.74] Technical specifications EV1 00 and C00 48 [1.89] 48 [1.89] System design Features CETOP 3 EV2 90,5 [3.56] Type of connector: DIN 43650 See page 7 for other dimensions and port characteristics. 29/05/2017 33
PM25 - Variable displacement pump POCLIN HYDRULICS Electrico-proportional servo control 1 2 3 4 5 6 7 8 9 10 11 y means of a potentiometer and a control card, a voltage signal is applied to the proportional electrovalve coils which adjust the pressure of the servo control connected to the pump swashplate. t every position of the potentiometer lever, there is a corresponding swashplate position. The flow rate direction depends on which coil is excited. The adjustment speed can be controlled by ramps installed on the card and by restrictors (Rs) positioned between the electrovalve and the servo control. Supply voltage 12V 24V P12 P24 Flow rate determination Rotation Pressure Output Input Clockwise (R) EP1 EP2 Counter clockwise (L) EP1 EP2 EP2 Rs EP1 Rs M1G1 G2 R M2 T1 T2 S 1400 700 The current must not exceed 1500 m under 12V and 800 m under 24V. Current (m) (12V) 1200 1000 800 600 500 400 Current (m) (24V) 600 300 0 50 100 Pump displacement (%) The spring return feature in the control unit is not a safety device. 34 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Dimensions Model Code Restrictor EP1 EP2 Restrictor Operating System design Options Controls 165,5 [6.51] Technical specifications 43 [1.69] EP1 68 [2.68] 68,4 [2.69] 48 [1.89] 48 [1.89] See page 7 for other dimensions and port characteristics. Features EP2 90,5 [3.56] Type of connector: DIN 43650 29/05/2017 35
PM25 - Variable displacement pump POCLIN HYDRULICS Hydraulic automotive control 1 2 3 4 5 6 7 8 9 10 11 In relation to the input rotation rate, the pump swashplate positioning cylinder is actuated by the pressure of the adjustment valve and a 4/3 electro-hydraulic valve, progressively positioning the swashplate. This provides a continuously variable pump displacement. The direction of the supplied flow is determined by which of the two solenoids is energized. The pilot pressure increases proportionally to the rotation plate. pump displacement increase corresponds to the higher pilot pressure. In case the prime mover is overloaded, the rotation rate decreases and the pilot pressure is reduced causing a pump displacement reduction with a corresponding drop in absorbed power. n "Inching" lever (option IC) is available to reduce the pilot pressure independently of the pump rotation speed. The hydraulic automotive control is also available with an hydraulic inching (HI). For that the port K must be connected to a pressure reducer valve ( see page 42). Supply voltage 12V 24V D12 D24 Flow rate determination Rotation Pressure Output Input Clockwise (R) E1 E2 Counter clockwise (L) E1 E2 M1 G1 D IC G2 R M2 IC= Mechanical inching EV2 EV1 Rs2 Rs1 T1 T2 S 36 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Dimensions with option IC 38,5 [1.51] Restrictor Restrictor 134 [5.27] EV1 95 [3.74] EV2 Model Code 3 x Ø 9 [dia. 0.35] 175,5 [6.91] 164,4 [6.47] 3 [0.12] Port K Options Controls Technical specifications 48 [1.89] Operating EV1 15,25 [0.60] System design 84,75 [3.34] Features 45 [1.77] 71 [2.80] 48 [1.89] 15 [0.59] 94 [3.70] Mechanical inching lever See page 7 for other dimensions and port characteristics. EV2 90,5 [3.56] 29/05/2017 37
PM25 - Variable displacement pump POCLIN HYDRULICS 38 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 OPTIONS Roller bearing Model Code 1 2 3 4 5 6 7 8 9 10 11 CR It is an optional high capacity bearing. Depending on the characteristics of shaft load, the duty cycle of the application and the expected life time of your application, Roller bearing might be needed. Consult your Poclain Hydraulics pplication Engineer. Technical specifications Fluorinated elastomer seals 1 2 3 4 5 6 7 8 9 10 11 EV Standard NR sealing are designed to resist to temperature up to 90 C [194 F] and to HV type oils. If your application is outside these limits, Fluorinated elastomer seals might be recommended. Operating Consult your Poclain Hydraulics pplication Engineer. UNF threads ports 1 2 3 4 5 6 7 8 9 10 11 FU System design M1 R G1 G2 M2 T2 T1 S Port Function ISO 11926-1 - Services 1 1/6-12-UNF G uxiliary 9/16-18-UNF M1/M2 Gauge 9/16-18-UNF / Servo control pilot 9/16-18-UNF S Suction 1 1/6-12-UNF T1/T2 Drain 3/4-16-UNF Features Options Controls 29/05/2017 39
PM25 - Variable displacement pump POCLIN HYDRULICS Filter on pressure line The PM25 pumps can have a pressure filter without clogging indicator (F0) or with clogging indicator (F2). The flow thru the filter is only the flow that entry in the close loop. The filter fitness is of 10 micron. The max. working pressure is 30 bar [435 PSI]. Maximum pressure difference between filter cartridge input and output is 2 bar [29 PSI]. When reaching 2 bar [29 PSI], the cartridge has to be changed. Tightening torque: 35 Nm [309 in.lbf]. 1 2 3 4 5 6 7 8 9 10 11 F0 Without clogging indicator F2 With clogging indicator M1 G1 G2 M2 M1 G1 G2 M2 NC 2 bar [29 PSI] T1 T2 S T1 T2 S M1 G1 G2 142 [5.59] M2 Ø 62 [dia. 2.44] 94,5 [3.72] 35 [1.38] 115,5 [4.55] 150 [5.90] Clogging indicator Clogging indicator specification Differential working adjustment Working temperature Max. vibration level Connector type Current range 2 1 3 ± 0,2 bar [44 ± 3 PSI] -30 C ~ 110 C [-22 F ~ 230 F] 50 g MP super seal, 2 way 0,1-0,2 max. 1 2 Normally closed contact. Thread of the clogging indicator is internally connected to ground. 40 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 External connections for filter 1 2 3 4 5 6 7 8 9 10 11 F3 Model Code M1 33 [1.30] 33 [1.30] 11,5 [0.45] 11,5 [0.45] R G1 G2 C M2 11 [0.43] 11 [0.43] M2 C G1 = to filter on line G2 = Return from filter on line R G2 S G1 M1 Rs2 M5 T2 M6 Rs1 T1 Technical specifications Pressure cut-off valve 1 2 3 4 5 6 7 8 9 10 11 LP Operating The function of the cut-off valve is to avoid that the pump absorbed power exceeds the machine engine power. The cut-off valve is connected to and piston pump s high pressure lines and is usually set at 20 to 30 bar [290 to 435 PSI] lower than the maximum relief valve of the closed circuit. The cut-off valve acts on the servo control operating pressure in order to reduce the pump displacement and the adsorbed power. M1 G1 G2 R M2 System design 0.8 Features X T1 T2 R S View X M1 113 [4.45] G1 G2 Max deep of the nipples for the connections M1-M2 and G1-G2-R must be 10 mm. M2 Pressure cut-off setting Options Controls 29/05/2017 41
PM25 - Variable displacement pump POCLIN HYDRULICS Mechanical inching 1 2 3 D12 or D24 4 5 6 7 8 9 10 11 IC For hydraulic automotive control D. n "Inching" lever is available to reduce the pilot pressure independently of the pump rotation speed. See Hydraulic automotive control (D) page 36. Hydraulic inching 1 2 3 D12 or D24 4 5 6 7 8 9 10 11 HI M1 G1 G2 R C M2 D Towards hydraulic joystick From hydraulic joystick Rs2 Rs1 K H M1 R K Rs1 61.5 [2.42] T1 T2 S G1 49 [1.65] Port Function ISO 1179-1 K External servo pilot 1/8 GS G2 C T1 For hydraulic automotive control D is available an hydraulic inching HI that consist in a connection K on the pump body to be connect with a pressure reducer valve (for example brake pedal V002 or V012). See hydraulic automotive control (page 36). M2 42 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Neutral position switch 1 2 3 4 5 For the control it is possible to obtain a micro switch to avoid the start of the engine if the lever of the control is not in center (zero position). 6 7 8 9 10 11 MI Model Code Rs M1 G1 G2 R M2 Technical specifications T1 T2 S Operating 101 [3.98] 50,5 [1.99] G1 M1 R 117,5 [4.62] System design G2 Features M2 Options Controls Type of connector: Deutsch DT04-2P 29/05/2017 43
PM25 - Variable displacement pump POCLIN HYDRULICS Flushing valve 1 2 3 4 5 6 7 8 9 10 11 VS inside the pump cover, a purge valve can be fitted with discharge inside the pump casing by means of a calibrated hole. The exchange valve is useful in case the temperature of the oil in the closed circuit is too high. M1 G1 G2 R M2 T1 T2 S X R M1 112 [4.41] G1 G2 M2 Finishing coat 1 2 3 4 5 6 7 8 9 10 11 P The pumps can be delivered with finishing coat when requested. Standard paint is RL 9005 (black color). Consult your Poclain Hydraulics application engineer for other colors of topcoat. 44 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Customized identification plate 1 2 3 4 5 6 7 8 9 10 11 DP Model Code It is possible to provide our products with dedicated plate (your part number engraved on the plate) when requested. This option is available only for minimum volume of 50 pieces. Consult your Poclain Hydraulics application engineer for other possibilities. Technical specifications nti-stall valve 1 2 3 4 5 SD option consists of a block valve (same body as automotive valve) which provide a pressure signal for the servo piston of the pump related to the speed of engine. In case of engine overload and consequent rpm reduction the SD valve reduces the pressure for the servo piston and the pump de-stroke consequentially with an anti-stall effect. 6 7 8 9 10 11 SD Operating For application of this option please contact your Poclain Hydraulics application engineer. System design Options Controls Features 29/05/2017 45
PM25 - Variable displacement pump POCLIN HYDRULICS 46 29/05/2017
POCLIN HYDRULICS Variable displacement pump - PM25 Options Controls Features System design Operating Technical specifications Model Code 29/05/2017 47
Poclain Hydraulics reserves the right to make any modifications it deems necessary to the products described in this document without prior notification.the information contained in this document must be confirmed by Poclain Hydraulics before any order is submitted. Illustrations are not binding. The Poclain Hydraulics brand is the property of Poclain Hydraulics S.. 29/05/2017 35767C www.poclain-hydraulics.com