SCX180 TECHNOLOGY DRIVEN CONTROL FOCUSED. SSL-1000 Rev. 4/11 Supercedes Rev. 3/11

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1 SCX18 TECHNOLOGY DRIVEN CONTROL FOCUSED SSL-1 Rev. 4/11 Supercedes Rev. 3/11

2 Benefits/Features of SCX18 Improved efficiency means more work with less fuel Designed to minimize pressure drops High flow / low pressure drop capability in a compact package D ual tank rails that connect in each section Increased productivity by improving vehicle controllability Multi-function flow sharing, even when flow demand exceeds flow supply Pressure compensation provides consistent flow rates, regardless of load pressure Precise metering capabilities Simplified hydraulic system with features integrated into the main control valve M anual, hydraulic pilot operated, electrohydraulic, pneumatic control options L ow leakage capabilities W orks with fixed displacement or variable displacement PCLS pumps Optional priority inlet for steering or other priority functions Multiple outlet options including integrated pressure reducing valve for supplying pilot pressure to internal EH solenoids and to external pilot control circuits Integrated on-off solenoid to control pilot pressure supply for safety cut-out Optional dual hydraulic pilot and electrohydraulic control Ability to integrate electrohydraulic side shift clamp valve or ISO to SAE pattern select controls for tractor loader backhoes Optional LMI circuitry for cranes M anual levers available with E-H actuation SCX18 Applications Earthmoving Equipment Tractor Loader Backhoes Crawlers Excavators Wheel Loaders Low cost of ownership by utilizing a robust cost effective design C ost effective electrohydraulic sections have EH solenoids installed directly into the spool housing no bolt-on blocks or remote manifolds required High pressure ratings for NFPA or ISO standards Universal spools can be used in any type of spool section No load sense shuttles required, simplifying valve assembly and service Integrated filter screens on electrohydraulic proportional pressure reducing valves and load sense relief valves Complete Valve Family S CX18 is part of the SCX Platform which satisfies applications from 12-3 lpm. SCX is available in three sizes: SCX12, SCX18 and SCX3. Material/Personnel Handling Equipment Telehandlers Aerial Work Platforms

3 SCX 1 8 TAB L E OF C ON T E N T S SCX18 Cut Aways SCX18 Specifications SCX18 Technical Description, Product Benefits & Features Standard SCX18 Spools Standard Spool Flow Rates Standard Spool Pressure Drops (Inlet to Work Port) and Compensator Performance Standard Spool Pressure Drops (Work Port to Outlet) SCX18 Valve Assembly Inlet Selection Assembly Options Spool Section Assembly Options Outlet Selection Assembly Options Relief Valves, End Mechanisms & Kits HUSCO Overview HUSCO Worldwide Appendix 1 Appendix Open Center versus Closed Center Post-Compensated versus Pre-Compensated

4 SCX18 CUTAWAYS INLET SELECTION CUTAWAY Load Sense Relief Valve Cavity Top Outlet Port Top Inlet Port A Work Port Electrohydraulic Proportional Pressure Reducing Valve Sump Passage Pilot Pressure Supply Passage Work Port Feeder Core or Bridge Bridge Drain Passage Pump (Inlet) Passage Compensator Spool Load Hold Check Sump Port Inlet Gauge Port Optional End Inlet Port Load Sense Port Optional End Outlet Port ELECTROHYDRAULIC SPOOL SECTION CUTAWAY B Work Port Auxiliary Port Precision Spool with Metering Notches Spring Centered EndMechanism Optioinal Pilot Port Low Pressure or Tank Pressure Load Sense Passage Auxiliary Pump Passage (LS Feed) 3 OUTLET SECTION CUTAWAY Pilot Pressure Supply Port (to external device) Sump Passage for Electrohydraulic Sections Pilot Pressure Passage for Electrohydraulic Sections Optional Inlet Port or High Pressure Carry Over Port Optional Load Sense Port Optional Outlet Port Sump Port Pilot Pressure Supply Check Valve Pressure Reducing Valve Cavity

5 SCX18 SPECIFICATIONS SPOOL CONTROL OPTIONS: Manual Control Hydraulically Pilot Operated Control Electrohydraulic Control Pneumatically Pilot Operated Control SIZE: Section Width 48. mm 1.89 in SEALS: BUNA-N (standard) VITON (optional) STANDARD PORT SIZES (MAXIMUM): Inlet (P) 1-5/16-2 (SAE 16) Standard ISO G1 Work Ports (A) and (B) 1-1/16-12 (SAE 12) Standard ISO G3/4 7/8-14 (SAE 1) Optional ISO G1/2 High Pressure Carry Over (HPCO) 1-5/16-12 (SAE 16) ISO G1 Outlet (T) 1-5/16-12 (SAE 16) Standard ISO G1 1-5/8-12 (SAE 2) Optional ISO G1-1/4 STANDARD INTERNAL LEAKAGE RATES: Rated Work Port Leakage (A or BxT) tested with 7 bar (1,15 psi) Separate Section Assemblies P at 43 ± 4 C (11 ± 1 F) and mm 2 /sec ( SSU) 25 cm 3 /min 1.5 in 3 /min kinematic viscosity Finished Valve Assemblies 16 cm 3 /min 1. in 3 /min STANDARD OPERATING FLOWS: Rated Inlet Flow 23 lpm 6 gpm Rated Section Flow 18 lpm with 15 bar P-LS 48 gpm with 215 psi P-LS (Work Port Flow) differential pressure differential pressure STANDARD OPERATING PRESSURES: ISO Rating* NFPA Rating* Rated Inlet Pressure 345 bar 5, psi 28 bar 4, psi Rated Work Port Pressure 345 bar 5, psi 28 bar 4, psi Rated Outlet Pressure 64 bar 925 psi 52 bar 75 psi STANDARD OPERATING CONDITIONS: Fluid Mineral based oil (SAE 1W or equivalent) Fluid Temperature Range -29 to +14 C -2 F to +22 F Maximum Fluid Contamination Level ISO 2/17/14 * ISO rating is defined as 6 samples cycle tested at rated pressure for 1,, cycles without failure. NFPA rating is defined as 6 samples cycle tested at 1.23 x rated pressure for 1,, cycles without failure. Consult HUSCO Sales department for further detail on pressure rating specifications. Consult HUSCO Sales department for other options 4

6 SCX18 TECHNICAL DESCRIPTION SCX18 is a closed-center, load-sensing, sectional control valve with post-pressure compensation that offers a wide range of control options and flexibility. SCX18 can be used with fixed displacement pumps or with pressure-compensated, load-sensing variable displacement pumps and can be configured with one to ten working sections. The load sense (LS) pressure in an SCX18 valve is generated by the compensator spool using the HUSCO patented IsoComp method to copy the LS signal using oil supplied by the pump instead of stealing oil from the function. Using pump oil to generate the LS signal prevents function droop at the start of metering when a function is selected. When multiple functions are selected, the SCX18 will automatically resolve the highest function load pressure, which is then transmitted to the pump or inlet unloader (bypass compensator). This design eliminates the need for shuttles between sections, simplifying the assembly of the valve and offers excellent flow sharing capability (the valve will maintain the ratio of flows to each function, even when flow demand exceeds flow supply). Each SCX18 valve comes with a load sense relief valve (LSRV) with an integrated pressure compensated drain function. The LS drain ensures that LS pressure drains to tank once all spools are returned to the neutral position. Each section assembly has a built-in pilot pressure supply rail and a sump rail on each side of the valve for use with electrohydraulic (EH) proportional pressure reducing valves (EPRVs). It is recommended that the sump port be plumbed directly to tank to minimize any back pressure that may affect electrohydraulic solenoid valves (a maximum sump pressure of 7 bar (1 psi) is recommended). Work port pressure limiting is accomplished by using the optional auxiliary relief valves. Each working section comes standard with auxiliary relief valve cavities machined for both work ports. See Appendix 1 for a comparison of closed center to open center valve systems. See Appendix 2 for a comparison of post-compensated to pre-compensated valve systems. SCX18 PRODUCT BENEFITS & FEATURES 5 Excellent multi-function flow sharing with post-pressure compensation High flow, low pressure drop capability Compact size Dedicated electrohydraulic (EH) section Sections can be ordered electrically prepared, allowing conversion from pilot operated to EH operated in the field Lever option for EH and pilot operated sections Universal spools can be used in manual, pilot operated or EH sections Adjustable flow control option Stroke limiter option Allows for reduced flow from a given spool Manual override adjustment screw option Allows a spool to be shifted in a dead-engine situation

7 STANDARD SCX18 SPOOLS The SCX18 3-position spool is interchangeable between manual, pilot operated and electrohydraulically operated section assemblies. Each spool has a threaded hole on both ends, allowing any spool to be a left-handed or right-handed spool. Spool Flow Rate STANDARD SCX18 3-POSITION SPOOLS Flow rates are based on a 15 bar (215 psi) pump to LS differential pressure. Each spool is designed for the same flow rates for both work ports. Cylinder Spool Part Number Restricted Motor Spool Part Number 19 lpm (5 gpm) SCX18-S1 SCX18-S7 SCX18-S13 38 lpm (1 gpm) SCX18-S2 SCX18-S8 SCX18-S14 76 lpm (2 gpm) SCX18-S3 SCX18-S9 SCX18-S lpm (3 gpm) SCX18-S4 SCX18-S1 SCX18-S lpm (4 gpm) SCX18-S5 SCX18-S11 SCX18-S17 18 lpm (48 gpm) SCX18-S6 SCX18-S12 SCX18-S lpm (6 gpm) SCX18-S19 SCX18-S2 SCX18-S21 Full Motor Spool Part Number MANUALLY OPERATED HYDRAULICALLY PILOT OPERATED ELECTROHYDRAULICALLY OPERATED 6

8 STANDARD SPOOL FLOW RATES SCX18 STANDARD SPOOLS WORK PORT FLOW VERSUS PUMP-LS DIFFERENTIAL PRESSURE Pump-LS Differential Pressure (psid) Full Flow Spool 7 24 Work Port Flow (lpm) lpm (48 gpm) Spool 151 lpm (4 gpm) Spool 114 lpm (3 gpm) Spool 76 lpm (2 gpm) Spool Work Port Flow (gpm) lpm (1 gpm) Spool lpm (5 gpm) Spool Pump-LS Differential Pressure (bar) SCX18 STANDARD SPOOLS WORK PORT FLOWS VERSUS TRAVEL Flow (lpm) Full Flow Spool 18 lpm (48 gpm) Spool 151 lpm (4 gpm) Spool 114 lpm (3 gpm) Spool 76 lpm (2 gpm) Spool Flow (lpm) lpm (1 gpm) Spool 2 19 lpm (5 gpm) Spool Spool Travel (mm) Force Pilot Pressure Current (Amp) - 12 VDC 7 Notes: Force values are based on standard 3-position manual spring end mechanism 6151 Pilot pressure values are based on series of pilot operated end mechanisms Current values are based on the 12 VDC, 2 bar proportional pressure reducing valve

9 STANDARD SPOOL PRESSURE DROPS (INLET TO WORK PORT AND COMPENSATOR PERFORMANCE) SCX18 STANDARD SPOOLS INLET TO WORK PORT PRESSURE DROP Work Port Flow (gpm) Pressure Differential (bar) lpm (1 gpm) Spool 19 lpm (5 gpm) Spool 76 lpm (2 gpm) Spool 114 lpm (3 gpm) Spool 151 lpm (4 gpm) Spool 18 lpm (48 gpm) Spool Pressure Differential (psid) Work Port Flow (lpm) SCX18 STANDARD SPOOLS COMPENSATOR PERFORMANCE WORK PORT FLOW VERSUS LOAD PRESSURE Work Port Flow Rate (lpm) Load Pressure (psi) Work Port Flow Rate (gpm) Load Pressure (bar) 8

10 STANDARD SPOOL PRESSURE DROPS (WORK PORT TO OUTLET) INLET TO WORK PORT PRESSURE DROPS SCX18 FULL FLOW SPOOLS INLET TO WORK PORT PRESSURE DROP PUMPING INTO INLET HOUSING SCX18 FULL FLOW SPOOLS INLET TO WORK PORT PRESSURE DROP PUMPING INTO OUTLET HOUSING Flow (gpm) Flow (gpm) Section Section 1 9 Pressure Differential (bar) Section Pressure Differential (bar) Pressure Differential (bar) Section Pressure Differential (psid) Flow (lpm) Flow (lpm) WORK PORT TO OUTLET PRESSURE DROPS SCX18 FULL FLOW SPOOLS WORK PORT TO OUTLET PRESSURE DROP FLOWING OUT OF INLET HOUSING Flow (gpm) SCX18 FULL FLOW SPOOLS WORK PORT TO OUTLET PRESSURE DROP FLOWING OUT OF OUTLET HOUSING Flow (gpm) Pressure Differential (bar) Section 8 Section Pressure Differential (psid) Pressure Differential (bar) Section 1 Section Pressure Differential (psid) Flow (lpm) Flow (lpm) 9

11 SCX 1 8 VALV E A S S E M B LY 1

12 INLET SECTION ASSEMBLY OPTIONS SCX181-E INLET SECTION ASSEMBLIES Designed for use with variable displacement, pressure-compensated load-sensing pumps Inlets come standard with a load sense relief valve cavity machined for the 5693 load sense relief valve Inlets come standard with an inlet pressure relief valve cavity machined for relief valves or 5261 shut-off plugs See table below for port options 11 INLET SECTION ASSEMBLY TOP INLET PORT TOP OUTLET PORT END INLET PORT END OUTLET PORT INLET PRESSURE GAUGE PORT LOAD SENSE PORT SCX181-E1 1-5/16-12 (SAE 16) 1-5/16-12 (SAE 16) 1-5/16-12 (SAE 16) 1-5/16-12 (SAE 16) 9/16-18 (SAE 6) 9/16-18 (SAE 6) SCX181-E2 1-5/16-12 (SAE 16) 1-5/16-12 (SAE 16) /16-18 (SAE 6) 9/16-18 (SAE 6) SCX181-E5 ISO G1 ISO G1 ISO G1 ISO G1 ISO G1/4 ISO G1/4 SCX181-E6 ISO G1 ISO G ISO G1/4 ISO G1/4 Consult HUSCO Sales department for non-standard options.

13 INLET SECTION ASSEMBLY OPTIONS SCX181-C INLET SECTION ASSEMBLY (UNLOADER / BYPASS COMPENSATOR INLET) Designed for use with fixed displacement pumps Unloader has a standard 15 bar (215 psi) bias spring to create pump-to-ls differential pressure Inlet comes standard with a load sense relief valve cavity machined for the 5693 load sense relief valve Inlet comes standard with an inlet pressure relief valve cavity machined for the 636 series relief valve, 6156 relief valve or 6165 shut off plug See table below for port options Inlet to Outlet Pressure Differential (bar) UNLOADER INLET (BYPASS COMPENSATOR) PERFORMANCE Inlet Flow (gpm) Inlet Flow (lpm) Inlet to Outlet Pressure Differential (psid) INLET SECTION ASSEMBLY INLET PORT OUTLET PORT LOAD SENSE PORT SUMP PORT INLET PRESSURE GAUGE PORT SCX181-C1 1-5/16-12 (SAE 16) 1-5/16-12 (SAE 16) 9/16-18 (SAE 6) 9/16-18 (SAE 6) 9/16-18 (SAE 6) SCX181-C4 ISO G1 ISO G1 ISO G1/4 ISO G1/4 ISO G1/4 12 Consult HUSCO Sales department for non-standard options.

14 SPOOL SECTION ASSEMBLY OPTIONS All SCX18 catalog spool section assemblies come with the following standard features: 1-1/16-12 (SAE 12) Work Ports Work port circuit relief valve cavities machined for both A port and B port Independent load hold check Independent compensator spool 3-position spool section assemblies are available with the following control options: Manual, spring-centered Manual, 3-position detent Hydraulically pilot operated Pneumatically pilot operated Proportional or on/off electrohydraulically operated Hydraulically pilot operated, electrically prepared The following options are available for 3-position section assemblies: Auxiliary relief valve assemblies Spool stroke limiter assembly Spool manual override & stroke limiter assembly Adjustable flow control assembly Electrohydraulic shut-off plug assembly kit 13 The series of Tie Rod Kits include the standard tie rod part numbers and nuts required to build SCX18 valve assemblies. Tie rod kits for valve stacks of eight, nine or ten section assemblies come with compression washers (recommended for longer valve stacks). TIE ROD KITS Part Number Valve Assembly Size Part Number Valve Assembly Size Section Sections Sections Sections Sections Sections Sections Sections Sections Sections Tie rod nut installation torque = 91 N-M (67 FT-LBF)

15 SPOOL SECTION ASSEMBLY OPTIONS SPOOL SECTION ASSEMBLY ORDERING NOMENCLATURE SCX182 - SECTION CODE SPOOL CODE The table below contains the SPOOL CODES for 3-position section assemblies: Spool Type Spool Flow Rate lpm (gpm) Spool Code Cylinder Spool 19 lpm (5 gpm) 1 38 lpm (1 gpm) 2 76 lpm (2 gpm) lpm (3 gpm) lpm (4 gpm) 5 18 lpm (47.6 gpm) 6 Full Flow 19 Restricted Motor 19 lpm (5 gpm) 7 38 lpm (1 gpm) 8 76 lpm (2 gpm) lpm (3 gpm) lpm (4 gpm) lpm (47.6 gpm) 12 Full Flow 2 Full Motor 19 lpm (5 gpm) lpm (1 gpm) lpm (2 gpm) lpm (3 gpm) lpm (4 gpm) lpm (47.6 gpm) 18 Full Flow Consult HUSCO Sales department for non-standard options.

16 SPOOL SECTION ASSEMBLY OPTIONS 3-POSITION, MANUAL, RIGHT-HANDED SECTION ASSEMBLIES Section Code Work Port Spring Centered Detent A1A A1D A1B A1E 1-1/16-12 (SAE 12) x ISO G3/4 x 1-1/16-12 (SAE 12) x ISO G3/4 x 15

17 SPOOL SECTION ASSEMBLY OPTIONS 3-POSITION, HYDRAULICALLY PILOT OPERATED SECTION ASSEMBLIES Section assemblies use 25 bar (36 psi) centering springs, for use with the standard HUSCO pilot pressure controller See page 25 for spool stroke limiter and manual override options Section Code Work Port Pilot Port A1C A1F 1-1/16-12 (SAE 12) ISO G3/4 9/16-18 (SAE 6) ISO G1/4 16

18 SPOOL SECTION ASSEMBLY OPTIONS 3-POSITION, ELECTROHYDRAULICALLY PILOT OPERATED SECTION ASSEMBLIES Electrohydraulic section assemblies are spring centered and use HUSCO manufactured proportional pressure reducing valves (EPRV). Standard section assemblies come with integrated Deutsch DT4-2P female connectors and have 2 bar control pressure (29 psi) centered springs Standard section assemblies come with end pilot ports and 9/16-18 (SAE 6) o-ring port plug assemblies installed Pilot supply pressure feeding EH sections should be a minimum of 25 bar (362 psi) to ensure full spool shift. Maximum pilot supply pressure feeding EH sections should not exceed 25 bar (3,625 psi). Sump gallery connected to EPRV s should not exceed 7 bar (1 psi). See page 25 for spool stroke limiter and manual override options See page 22 for other EPRV options Section Code Work Port E1A 1-1/16-12 (SAE 12) E1B ISO G3/4 E1C E1D 1-1/16-12 (SAE 12) ISO G3/4 Voltage 12 VDC 12 VDC 24 VDC 24 VDC Command Current A A A A 17 Consult HUSCO Sales department for non-standard options.

19 OUTLET SECTION ASSEMBLY OPTIONS No inlet (P) port, outlet (T) port or load sense (LS) port options Outlets are available with the following options: No EH machining (end cover only) EH machining for pump pressure to feed EH pilot supply rails from internal pump rail* *NOTE: when using pump pressure to directly supply EH sections, inlet pressure must be limited to 25 bar (3,625 psi), to prevent exceeding the maximum supply pressure to the PPRVs EH machining for external pilot pressure supply to be fed into SCX18 valve to feed EH supply rails See table below for port options SCX183-C OUTLET SECTION ASSEMBLIES E OUTLET SECTION ASSEMBLY TOP SUMP PORT TOP PILOT SUPPLY PORT END SUMP PORT END PILOT SUPPLY PORT REQUIRES EXTERNAL PILOT PRESSURE SUPPLY INTERNAL PUMP PRESSURE USED TO SUPPLY EH SOLENOIDS* SCX183-C1 NONE NONE NONE NONE N/A N/A SCX181-C2 9/16-18 (SAE 6) NONE NONE NONE NO YES SCX181-C3 9/16-18 (SAE 6) 9/16-18 (SAE 6) NONE NONE YES NO SCX181-C4 ISO G1/4 NONE NONE NONE NO YES SCX181-C5 ISO G1/3 NONE NONE NONE YES NO 18 Consult HUSCO Sales department for other outlet options.

20 OUTLET SECTION ASSEMBLY OPTIONS SCX183-B OUTLET SECTION ASSEMBLIES Outlets come standard with machined cavity for pressure reducing valve for the purpose of generating a low pressure pilot supply for EH spool sections and for supplying external devices such as pilot circuits - See page 24 for options. See table below for port options Other options available: PPC Supply Port with on-off solenoid, LS dump solenoid, backhoe side-shift clam with on-off solenoid. 19 OUTLET SECTION ASSEMBLY END INLET PORT Consult HUSCO Sales department for other outlet options. END OUTLET PORT TOP SUMP PORT TOP PILOT SUPPLY PORT LOAD SENSE PORT SCX183-B14 1-5/16-12 (SAE 16) 1-5/16-12 (SAE 16) 9/16-18 (SAE 6) 9/16-18 (SAE 6) 9/16-18 (SAE 6) SCX183-B4 NONE NONE 9/16-18 (SAE 6) 9/16-18 (SAE 6) 9/16-18 (SAE 6) SCX183-B8 ISO G1 ISO G1 ISO G1/4 ISO G1/4 ISO G1/4

21 RELIEF VALVES, END MECHANISMS AND KITS LOAD SENSE RELIEF VALVE AND DRAIN REGULATOR ASSEMBLY The 5693 is the standard load sense relief valve for the SCX18 valve line. Installed into the inlet housing, it limits the maximum LS pressure, which therefore limits the maximum inlet (P) pressure also has an integrated pressure compensated LS drain, which drains off LS pressure when none of the spools are selected. The relief valve is protected against contamination with an integrated 1μ filter has a setting range of 62-3 bar (9-4,35 psi). The standard catalog setting for 5693 is 214 bar (3,1 psi) and can be adjusted to suit the requirements needed for each application. SURGE WORK PORT RELIEF VALVE ASSEMBLY The 636 Relief Valve Assembly is a direct acting relief valve with integrated anti-void (anti-cavitation) function and is the standard work port relief valve option (shock valve). The 636 can also be used in some inlet housings to prevent fast inlet (P) pressure spikes from damaging the main control valve or the rest of the hydraulic system. Relief valves are set at 1 lpm (2.6 gpm) and have a recommended maximum flow rate of 75 lpm (19.8 gpm). The relief valve setting is stamped on the RV plug (for example: 2 = a setting of 2 bar (2,9 psi)). Part Number Setting (bar) Setting (psi) , , , , , , , ANTI-VOID (ANTI-CAVITATION) PERFORMANCE Flow (gpm) Flow (gpm) Pressure Drop (bar) Flow (lpm) Pressure Drop (psid) Pressure Drop (bar) Flow (lpm) Pressure Drop (psid) 2 Consult HUSCO Sales department for non-standard RV settings.

22 RELIEF VALVES, END MECHANISMS AND KITS WORK PORT ANTI-VOID (ANTI-CAVITATION) VALVE ASSEMBLY AND SHUT-OFF PLUG ASSEMBLY The 614 is the standard anti-void assembly, designed to prevent cavitation in the valve work port. The 614 has AV stamped on the plug. The 6165 is the standard shut-off plug assembly, designed to block off the work port RV cavity when no RV is required and the inlet (P) pressure RV cavity when no inlet RV is required. PRESSURE REDUCING VALVE ASSEMBLY FOR PILOT PRESSURE SUPPLY The pressure reducing valve reduces inlet (P) pressure down to down to a lower pressure pilot supply. It is used in the SCX183-B Outlet Section Assemblies for SCX18 valve assemblies that require internal or external pilot pressure supply comes with 3 bar (435 psi) nominal pressure setting and can be adjusted between1.3 bar (15 psi) to 4. bar (55 psi). The valve is protected against contamination with an integrated 1μ filter. A PRESSURE REDUCING VALVE SHUT-OFF PLUG ASSEMBLY A series of shut-off plug assemblies are available to plug the pressure reducing valve cavity in SCX183-B Outlet Section Assemblies, in case the pressure reducing valve is not required. 21 Part Number Pilot Supply Source 4554* Inlet Supply 4555 External Supply 9/16-18 (SAE 6) Port 4587 External Supply ISO G 1/4 Port *Note: When using the 4554 Shut-Off Plug, inlet pressure must be limited to 25 bar (3,625 psi) maximum, to prevent exceeding the maximum supply pressure supplied to the EPRVs.

23 RELIEF VALVES, END MECHANISMS AND KITS ELECTROHYDRAULIC PRESSURE REDUCING VALVES (EPRV) HUSCO Electrohydraulic Pressure Reducing Valves (EPRV) are IP69 rated and come with an integraded 1μ filter on the pilot pressure supply ( B ) gallery of the EPRV. HUSCO EPRVs work with a maximum supply pressure of 25 bar (3,625 psi), require a 1 Hz PWM command signal and can operate in a temperature range of -3 C to 12 C (oil temp) and -3 C to 8 C (amibent air temp). The EPRV electrical coil has a 1% duty cycle rating and a Class H insulation rating. The sump port on the main control valve assembly should be connected to the system reservoir with a minimum amount of back pressure (a maximum back pressure of 7 bar (1 psi) is reccommended). EPRVs can be used for either proportional control or on-off ( bang-bang ) control. See table below for connector style, threshold current & pressure, maximum current & pressure resistance characteristics. EPRV Part No D D D D A2 Connector Style Connector Color Voltage (VDC) Resistance at 2 C (Ω) Threshold Current (ma) Maximum Current (ma) Threshold Control Pressure (bar) Maximum Control Pressure (bar) Deutsch DT4-2P Black ±.27 6 ± Deutsch DT4-2P Natural (beige) ±.27 6 ± Deutsch DT4-2P Blue ±.4 3 ± Deutsch DT4-2P Grey ±.4 3 ± Amp Junior Power Timer Black ±.27 6 ± ELECTROHYDRAULIC CONVERSION ASSEMBLY KIT The Conversion Kits will plug the EH solenoid cavity on EH sections and provides a port for connecting pilot pressure to the spool spring chamber in order to shift the spool as a hydraulically pilot operated section. The kit allows a section assembly to be electrically prepared (machined for EPRV solenoid valves but built to be hydraulically pilot operated). When a customer wants to update from pilot operated control to EH control, the section can be easily upgraded to EH in the field without the need for a costly valve removal. Part Number Pilot Port 9/16 (SAE 6) ISO G1/4 22

24 RELIEF VALVES, END MECHANISMS AND KITS ADJUSTABLE FLOW CONTROL KIT The SCX18 adjustable flow control works by providing an adjustable orifice that can regulate the flow of a full flow spool from approximately 6 lpm (15 gpm) to 15 lpm (4 gpm). Due to the extra restriction that is added with the adjustable flow control assembly, the maximum flow rate of a given spool is reduced when the flow control is installed. The graph below shows the flow adjustment range with standard SCX18 spools when using the adjustable flow control assembly. The flow control is most effective with full flow spools. When used with lower flow rate spools, the range of adjustment decreases. Assembled into the compensator bore in place of the standard compensator spool and plug assembly, the adjustable flow control assembly and compensator can be installed into an existing section assembly, making it ideal for vehicle upgrades or retro-fits in the field. Flow Control Assemblies are available with a plastic rabbit-turtle knob, or with a steel shaft for connection to an adjustment shaft. Work Port Flow (lpm) FLOW CONTROL ADJUSTMENT RANGE USING SCX18 STANDARD SPOOLS 18 lpm (48 gpm) Spool 151 lpm (4 gpm) Spool 114 lpm (3 gpm) Spool 76 lpm (2 gpm) Spool Work Port Flow (gpm) Flow Control Adjustment (turns)

25 RELIEF VALVES, END MECHANISMS AND KITS END MECHANISM KITS FOR 3-POSITION HYDRAULICALLY PILOT OPERATED SECTIONS The SCX18 end mechanisms for hydraulically pilot operated sections come standard with a 25 bar (36 psi) centering spring and are available with a variety of ports for connecting to a hydraulic pilot joystick. Kits are available with three different porting options: end port only, side port only, or both end port and side port. End Port Side Port /16-18 (SAE 6) 9/16-18 (SAE 6) 9/16-18 (SAE 6) 9/16-18 (SAE 6) 9/16-18 (SAE 6) 9/16-18 (SAE 6) PF 1/4 ISO G 1/4 PF 1/4 ISO G 1/4 END MECHANISM KITS FOR 3-POSITION ELECTROHYDRAULICALLY OPERATED SECTIONS SCX18 end mechanisms for electrohydraulically actuated sections come standard with a 2 bar (29 psi) centering spring, designed to work with the 2 bar HUSCO electrohydraulic EPRV. Kits are available with a 9/16-18 (SAE 6) o-ring port (for connecting to a hydraulic pilot joystick or using the stroke limiter assembly) or without a port End Port 9/16-18 (SAE 6) ISO G 1/4 PF 1/4 24 Consult HUSCO Sales department for pilot caps with non-standard port options.

26 RELIEF VALVES, END MECHANISMS AND KITS ADJUSTABLE STROKE LIMITER KIT AND MANUAL OVERRIDE KIT The Adjustable Stroke Limiter provides a mechanical stop that can be adjusted to limit the travel of a spool. It can be used to limit the maximum flow of a given spool or as a fine tuning mechanism when trying to match the flow from sections or work ports exactly. The Manual Override Kit provides spool stroke limiting also allows a spool to be manually shifted far enough to lower a machine implement in case of a dead engine situation. Both and are compatable with pilot operated and electrohydraulically operated sections. TANG END & SEAL PLATE KITS FOR MANUAL SECTIONS END MECHANISM KITS FOR 3-POSITION MANUAL SECTIONS 3-position, spring centered end mechanisms come with a standard 15 N (34 LBF) spring. 25 Consult HUSCO Sales department for non-standard centering spring forces.

27 APPENDIX 1 OPEN CENTER VERSUS CLOSED CENTER The following hydraulic circuits & graphs represent efficiency gains going from an open center valve with fixed displacement pump to a closed center valve with inlet unloader (bypass compensator) with fixed displacement pump to a closed center valve with pressure-compensated load-sensing variable displacement pump. The following table compares the system costs and efficiencies of an open center system, a closed center system with unloader (bypass compensator) and a closed center system with a pressure-compensated load-sensing variable displacement pump. Open Center System Fixed displacement pump Pressure differential across spool depends on flow Unloader (Bypass Compensator) System Fixed displacement pump Unloader (bypass compensator) spool diverts excess flow Constant pressure differential maintained Pressure Compensated Load Sense System (PCLS) Variable displacement pump Load sensing valve Pump flow varied to maintain constant pressure differential 26

28 APPENDIX 2 POST-COMPENSATED VERSUS PRE-COMPENSATED The following hydraulic circuits represent the basic design of post-pressure compensated and pre-pressure compensated closed center valve systems. There are several differences in the two styles of valve design, which are determined by the basic valve geometry and design. The most noticeable difference however, is that post-compensated valves continue to offer excellent flow sharing when flow demand exceeds flow supply, while pre-compensated valves will only meet the flow demands of the lowest loaded functions (causing higher loaded functions to slow down or stop moving). TRADITIONAL POST-PRESSURE COMPENSATED CIRCUIT Key Features: Pressure differential acting on the compensator spool is picked downstream of the main spool metering orifice Load sense signal from each function is picked up before the load sense shuttle All compensator spools reference the same resolved load sense signal Key feature for maintaining flow sharing Pump to load sense pressure differential is controlled by the pump or the inlet unloader (bypass compensator) Resulting Characteristics: When flow demand exceeds flow supply, the compensators will split the pump flow to all functions proportional to the main spool metering orifice of each spool Great flow sharing, even when exceeding flow supply. Maximum function pressure is limited using optional auxiliary relief valves Load Sense pressure limiting on individual functions is not available TRADITIONAL PRE-PRESSURE COMPENSATED CIRCUIT Key Features: Pressure differential acting on the compensator spool is picked from either side of the main metering orifice Load sense signal from each function is picked up after the load sense shuttle Compensator spools reference a load sense signal picked up before the load sense shuttle Allows load sense pressure limiting on individual functions Pump to load sense pressure differential is controlled by the compensator springs 27 Resulting Characteristics: When flow demand exceeds flow supply, the lowest loaded functions will take priority over the highest loaded function Highest loaded functions may stop moving, depending on flow demand

29 HUSCO OVERVIEW For over 6 years, HUSCO International has been designing and producing innovative and high performance hydraulic and electrohydraulic products in the agriculture, construction, forestry and material handling industry. Today HUSCO control products can be found on a variety of leading off-highway equipment throughout the world. Dedicated to meeting and exceeding the changing control needs of the off-highway market for today and well into the future, HUSCO employs an extensive engineering staff for the design of platform and customized products to provide costeffective solutions to maximize the efficiency, productivity, controllability and reliability of vehicles. HUSCO s extensive global engineering and vehicle fit-up and testing capabilities enable HUSCO to be an extension of OEM engineering teams to provide fast response and efficient solutions to global and regional market demands. This reduces product development cycles, improves the end product, and has led to HUSCO becoming a global hydraulic controls leader. Visit the HUSCO website at for a complete list of HUSCO sales offices and distributors.

30 HUSCO WORLDWIDE World Headquarters HUSCO International, Inc Pewaukee Road Waukesha, WI Phone: Fax: European Headquarters HUSCO International, Ltd. 6 Rivington Road Whitehouse Industries Estate Runcorn, Cheshire, England WA7 3DT Phone:(44) Fax: (44) Whitewater Operations HUSCO International, Inc Universal Boulevard Whitewater, WI 5319 Phone: Fax: Iowa Operations HUSCO International, Inc. 14 Generac Drive Maquoketa, IA Phone: Fax: HUSCO Brazil Rua Jaragua 397 sala 72 Porto Alegre RS Brazil Phone: (55) Fax: (55) Locally Focused

31 CONTROL FOCUSED - TECHNOLOGY DRIVEN China Headquarters HUSCO Hydraulics (Shanghai) Ltd. No. 235 Jiangtian Road East Song Jiang Industrial Zone Shanghai, 216 India Headquarters HUSCO Hydraulics Pvt, Ltd. Plot A4-Talegaon Industrial Area Pune, maharastra 4157, India Phone: (91) Fax: (91) Globally Driven 3

32 CONTROL FOCUSED TECHNOLOGY DRIVEN THE SCX PLATFORM IS A FAMILY OF CLOSED CENTER POST-PRESSURE COMPENSATED SECTIONAL VALVES DESIGNED SPECIFICALLY FOR THE CONSTRUCTION, MATERIAL HANDLING, AND FORESTRY EQUIPMENT MARKETS. THE SCX PLATFORM IS AVAILABLE IN THREE DIFFERENT SIZES: SCX12, SCX18 AND SCX3. World Headquarters HUSCO International, Inc Pewaukee Road Waukesha, WI Phone: Fax: European Headquarters HUSCO International, Ltd. 6 Rivington Road Whitehouse Industrial Estate Runcorn, Cheshire, England WA7 3DT Phone: (44) Fax: (44) China Headquarters HUSCO Hydraulics (Shanghai) Ltd. No. 235 Jiangtian Road East Song Jiang Industrial Zone Shanghai, 216 P.R. China Phone: (86) Fax: (86) India Headquarters HUSCO Hydraulics Private Ltd. Plot A4 - Talegaon Floriculture Ind. Estate - MIDC Village - Navlakh Umbre, Talegaon, Puna 4157, India Phone: (91) HUSCO Brazil Rua Jaragua 397 sala 72 Porto Alegre RS Brazil Phone: (55) Fax: (55) HUSCO International

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