Introduction HGA/HGB Series The HGA and HGB series Hydraguide steering units are designed for applications such as large agricultural equipment including tractors, combines and other self-propelled, specialized harvesting equipment. In addition, these units are frequently specified for many medium-to-heavy-duty applications such as logging and construction equipment and marine and mining applications. HGA/HGB Series Features Full Pressure Shaft Seal The Parker full pressure input shaft seal is able to withstand full system back pressure up to the pressure rating of the Hydraguide. This enables operation of auxiliary hydraulic functions downstream of steering. Linear Valve Spool The linear valve spool is less subject to stick and damage in the event of system contamination and allows generally better control. Pressure Dams Pressure dams provide a barrier of pressurized system oil between metered oil and return. Pressure dam valving provides more precise steering due to the reduction of lost leakage oil from the metering element. Vaned Rotor (HGA Only) The spring biased vanes in the rotor tips reduce leakage between pockets in the metering group. This provides more precise and positive steering. Pressure Balanced Metering Group All Parker designs utilize a pressurized envelope around the metering package (rotor set commutator) to reduce slippage leakage and provide more precise steering control. Manual Emergency Steering A ball check valve allows manual steering in emergencies when pump flow is interrupted. If the vehicle is large enough to require more than 100 ft.-lb. steering wheel torque in the manual mode, another means of emergency steering is recommended. D18
Specifications HGA/HGB Series HGA Hydraguide Series 08 10 12 14 16 20 24 28 32 Displacement English 1 5.94 7.42 8.91 10.40 11.88 14.85 17.82 20.79 23.74 (in 3 /rev) (cm 3 /rev) Metric 97.4 121.6 146.0 170.5 194.7 243.4 292.1 340.7 389.1 Operating Pressure Maximum 2500 2500 2500 2500 2500 2500 2500 2500 2500 (psi) (Bar) 175 175 175 175 175 175 175 175 175 Operating Temperature Maximum 200 200 200 200 200 200 200 200 200 ( F) ( C) 93.3 93.3 93.3 93.3 93.3 93.3 93.3 93.3 93.3 Continuous 5 5 5 10 10 10 10 11 12 Flow Rated 18.9 18.9 18.9 37.9 37.9 37.9 37.9 41.6 45.4 (gpm) (liters/min) Recommended 2 3.0 4.0 4.5 5.5 6.0 7.5 9.5 11.0 12.0 (120 rpm) 11.4 15.1 17.0 20.8 22.7 28.4 36.0 41.7 45.4 Weight 17.3 17.5 17.7 17.9 18.2 18.5 18.8 19.4 20.0 (lbs) (kg) 7.85 7.94 8.01 8.12 8.26 8.39 8.53 8.80 9.07 "A" Dimensions 3 7.09 7.21 7.34 7.46 7.59 7.84 8.09 8.34 8.59 (in) (mm) 180.1 183.1 186.4 189.5 192.8 199.1 205.5 211.8 218.2 1 English dimensions are control values; metric values are conversions. 2 For two handwheel turns per second. 3 Length from mounting face to end of Hydraguide. Fluid/Filtration Automatic transmission fluid (ATF) or contact your Parker Sales Engineer for other fluid recommendations. Use 20-50 micrometer nominal filtration. 120 HGA Delta P -vs- Flow at 130 F (54.5 C) (113 SUS) Inlet Flow (LPM) 4 8 11 15 18 23 26 30 34 38 8.3 D 100 6.9 80 5.5 (PSI) 60 40 LOW FLOW HIGH FLOW 4.1 2.8 (BAR) 20 1.4 1 2 3 4 5 6 7 8 9 10 Inlet Flow (GPM) Option 1: Use low flow unit for 5 GPM or less. Option 2: Use high flow unit for 5 to 10 GPM. D19
Dimensions HGA Series Open Center "A" See Chart 4.37 3.55 See Input Shaft Page 1.78 2.20 1.22 2.38 LT 1.34 25 3.57 Dia. 1.16 1.06 IN OUT AUX RT 1.645 Dia. 2.125 Pilot Dia. 5/16-18 UNC-2B Thd. 4 Holes Equally Spaced on a 2.875 Dia. Bolt Circle Mounting Screw Engagement Must Not Exceed.48 SAE 9/16-18 Strght. Thd. O-Ring Ports (4) This Port Pressurized When Input Shaft is Rotated Clockwise Load Sense "A" See Chart 4.37 3.55 See Input Shaft Page 1.78 2.20 1.22 2.38 LT 1.34 25 3.57 Dia. 1.16 1.06 LS OUT IN RT 1.645 Dia. 2.125 Pilot Dia. 5/16-18 UNC-2B Thd. 4 Holes Equally Spaced on a 2.875 Dia. Bolt Circle Mounting Screw Engagement Must Not Exceed.48 SAE 9/16-18 Strght. Thd. O-Ring Ports (5) This Port Pressurized When Input Shaft is Rotated Clockwise A Dimensions Series 08 10 12 14 16 20 24 28 32 (in) 7.09 7.21 7.34 7.46 7.59 7.84 8.09 8.34 8.59 (mm) 180.1 183.1 186.4 189.5 192.8 199.1 205.5 211.8 218.2 2. Mounting screw engagement must not exceed.48. 3. Low flow units are used with 5 GPM or less flow from pump. 4. High flow units are used with more than 5 GPM flow from pump. 5. Reversing units should be used with balanced area cylinders. D20
Dimensions HGA Series Power Beyond "A" See Chart 4.37 3.55 See Input Shaft Page 1.78 2.96 2.20 1.22 2.38 1.34 25 LT 3.57 Dia. 1.16 1.06 IN AUX OUT RT 1.645 Dia. Plugged on Closed Center Unit 2.125 Pilot Dia. 5/16-18 UNC-2B Thd. 4 Holes Equally Spaced on a 2.875 Dia. Bolt Circle Mounting Screw Engagement Must Not Exceed.48 SAE 9/16-18 Strght. Thd. O-Ring Ports (5) This Port Pressurized When Input Shaft is Rotated Clockwise D A Dimensions Series 08 10 12 14 16 20 24 28 32 (in) 7.09 7.21 7.34 7.46 7.59 7.84 8.09 8.34 8.59 (mm) 180.1 183.1 186.4 189.5 192.8 199.1 205.5 211.8 218.2 2. Mounting screw engagement must not exceed.48. 3. Low flow units are used with 5 GPM or less flow from pump. 4. High flow units are used with more than 5 GPM flow from pump. D21
Columns HGA Series Column Mount Direct Wheel Mount 3.45 3.02.874.875 Dia. "B" Length To Suit Wheel "W".50.858 Dia. Gage 1.75 Dia..372.374 Dia..623 Taper Per Foot 13/16-20 UNEF-2A Thd. Standard Column Hornwire Column 3.08.770.785 Dia. 5.62* "B" Length To Suit Wheel "W".50 * Dimension is 4.62 for SK000014-1075 Column Straight Spline Shaft 3.08.770.785 Dia. Full Bolt Groove Shaft 4.06.812 1.43 Notes: 2. Diameter of all columns is 1.75 inches. 3. Column support is required for columns longer than 14.25 inches. 4. Contact brush, screws, wheelnuts and spacer for horn button contact are assembled by customer. 5. For 'B' length see HGA Steering Column Selection Chart, page 30. D22
Specifications HGB Series HGB Hydraguide Series 16 24 32 40 48 64 Displacement English 1 30 45 60 75 90 120 (in 3 /rev) (cm 3 /rev) Metric 491.7 737.6 983.4 1229.3 1475.1 1966.8 Operating Pressure Maximum 2500/3000 4 2500/3000 4 2500/3000 4 2500/3000 4 2500/3000 4 2500/3000 4 (psi) (Bar) 175/210 175/210 175/210 175/210 175/210 175/210 Operating Temperature Maximum 200 200 200 200 200 200 ( F) ( C) 93.3 93.3 93.3 93.3 93.3 93.3 Continuous 35 35 35 35 35 35 Flow Rated 132.5 132.5 132.5 132.5 132.5 132.5 (gpm) (liters/min) Recommended 2 15.5 23.0 31.0 **35.0 **35.0 **35.0 (120 rpm) 58.7 87.1 117.3 132.5 132.5 132.5 Weight 37.0 40.0 43.0 46.0 49.0 52.0 (lbs) (kg) 16.78 18.14 19.51 20.87 22.23 23.59 A Dimensions 3 9.77 10.27 10.77 11.27 11.77 12.77 (in) (mm) 248.1 260.8 273.5 286.2 298.9 324.3 1 English dimensions are control values; metric values are conversions. 2 For two handwheel turns per second. 3 Length from mounting face to end of Hydraguide. 4 Special housing for 3000 psi operation available. Fluid/Filtration Automatic transmission fluid (ATF) or contact your Parker Sales Engineer for other fluid recommendations. 120 HGB Delta P -vs- Flow at 130 F (54.5 C) (113 SUS) Inlet Flow (LPM) 19 39 57 76 95 114 132 151 8.3 D Use 20-50 micrometer nominal filtration. 110 100 7.6 6.9 90 80 6.2 5.5 High Flow or Low Flow (PSI) 70 4.8 (BAR) 60 4.1 50 3.4 40 2.8 30 2.1 20 1.4 10.7 5 10 15 20 25 30 35 40 Inlet Flow (GPM) Option 1: Use low flow unit for 5 GPM or less. Option 2: Use high flow unit for 5 to 10 GPM. D23
Dimensions HGB Series Open Center SAE 1 1/16-12 Strght. Thd. O-Ring Ports (2) "A" See Chart 4.21 See Input Shaft Page 2.38 1.96 1.34 2.46 1.84 5.00 Dia. 1.25 1.12 LT OUT RT IN 1.645 Dia. 2.125 SAE 7/8-14 Strght. Thd. O-Ring Ports (2) 4.75 2.62 2.25 1.12 3.81 2.25 3/8-16 UNC-2B thd..62 Deep (4 Holes) (Unit Must Be Mounted on These Bosses) A Dimensions Series 16 24 32 40 48 64 (in) 9.77 10.27 10.77 11.27 11.77 12.77 (mm) 248.1 260.8 273.5 286.2 298.9 324.3 2. Reversing units should be used with balanced area cylinders. D24
Dimensions HGB Series Power Beyond SAE 1 1/16-12 Strght. Thd. O-Ring Ports (2) "A" See Chart 4.21 See Input Shaft Page 2.38 1.96 1.34 2.46 1.84 5.00 Dia. 1.25 1.12 LT OUT RT IN 1.645 Dia. 2.125 2.64 AUX SAE 7/8-14 Strght. Thd. O-Ring Ports (2) 2.62 3.69 SAE 1-1/16-12 Strght. Thd. O-Ring Port 1.53 SAE 1-1/16-12 Strght. Thd. O-Ring Port 4.75 D 2.25 1.12 2.25 3/8-16 UNC-2B thd.62 Deep (4 Holes) (Unit Must Be Mounted on These Bosses) 3.87 A Dimensions Series 16 24 32 40 48 64 (in) 9.77 10.27 10.77 11.27 11.77 12.77 (mm) 248.1 260.8 273.5 286.2 298.9 324.3 D25
Dimensions HGB Series Load Sense SAE 1 1/16-12 Strght. Thd. O-Ring Ports (2) "A" See Chart 4.21 See Input Shaft Page 2.38 1.96 1.34 2.46 1.84 5.00 Dia. 1.25 1.12 LT OUT RT IN 1.645 Dia. 2.125 3.40 SAE 7/8-14 Strght. Thd. O-Ring Ports (2) 1.34 2.62 SAE 9/16-18 Straight Thd. O-Ring Port 0.36 4.75 2.25 1.12 3.81 2.25 3/8-16UNC-2B thd..62 Deep (4 Holes) (Unit Must Be Mounted on These Bosses) A Dimensions Series 16 24 32 40 48 64 (in) 9.77 10.27 10.77 11.27 11.77 12.77 (mm) 248.1 260.8 273.5 286.2 298.9 324.3 D26
Columns Column Mount 4.06 HGB Series Direct Wheel Mount 5.62* "B" Length To Suit Wheel "W".50 * Dimension is 4.62 for SK000014-1075 Column Standard Column Hornwire Column "B" Length To Suit Wheel "W".50 5.62* "B" Length To Suit Wheel "W".50.858 Dia. Gage 1.75 Dia..623 Taper Per Foot 13/16-20 UNEF-2A Thd. * Dimension is 4.62 for SK000014-1075 Column D Straight Spline Shaft 3.08.770.785 Dia. Full Bolt Groove Shaft 4.06.812 1.43 Notes: 2. Diameter of all columns is 1.75 inches. 3. Column support is required for columns longer than 14.25 inches. 4. Contact brush, screws, wheelnut, and spacer for horn button contact are packaged and assembled by customer. 5. For 'B' length see HGB Steering Column Selection Chart, page 30. D27
Model Number Explanation Hydraguide Series HGA HGB HGA/HGB Series X X X X X HGA Displacement HGB Displacement XX in 3 /rev cm 3 /rev 08 5.94 97.4 10 7.42 121.6 12 8.91 146.0 14 10.40 170.5 16 11.88 194.7 20 14.85 243.4 24 17.82 292.1 28 20.79 340.8 32 23.74 389.1 XX in 3 /rev cm 3 /rev 16 30 491.7 24 45 737.6 32 60 983.4 40 75 1229.3 48 90 1475.1 64 120 1966.8 X Flow Type* 1 Low Flow 2 High Flow XX XX Shaft XX XX XX System Type Column Direct Wheel Full Bolt Straight Integral Mount Mount Groove Spline Column** Open Nonreversing 20 21 30 31 40 Center Reversing 22 23 32 33 42 Closed Center Nonreversing 24 25 34 35 44 Power Beyond Nonreversing 26 27 36 37 46 Load Sense/ Nonreversing 28 29 38 39 48 Demand Example: HGA10120 signifies HGA Hydraguide series unit with 7.42 in 3 /rev displacement, open center, nonreversing and column mount shaft. * HGA Low Flow 0-5 GPM High Flow 5-10 GPM HGB Low Flow 0-25 GPM High Flow 25-35 GPM ** Use A1 or A2 Columns D28
Steering Column Selection HGA/HGB Series HGA/HGB Part Number B Length in (mm) Specification Standard A10760 7.60 (194.06) 7/8" x 36; no horn contact A10960 9.60 (243.8) 7/8" x 36; no horn contact SK000007-0875 8.75 (222.2) 7/8" x 36; no horn contact SK000007-1075 10.75 (273.0) 7/8" x 36; no horn contact SK000007-1275 12.75 (323.8) 7/8" x 36; no horn contact SK000008-1625 16.25 (412.7) 7/8" x 36; no horn contact SK000008-1675 16.75 (425.4) 7/8" x 36; no horn contact SK000008-2375 23.75 (603.2) 7/8" x 36; no horn contact SK000008-2825 28.25 (717.5) 7/8" x 36; no horn contact SK000008-3125 31.25 (793.7) 7/8" x 36; no horn contact SK000008-3625 36.25 (920.7) 7/8" x 36; no horn contact SK000008-3875 38.75 (984.2) 7/8" x 36; no horn contact Hornwire A20760 7.60 (194.06) 7/8" x 36; single horn contact A20960 9.60 (243.8) 7/8" x 36; single horn contact SK000014-1075 10.75 (323.8) 7/8" x 36; single horn contact SK000014-1275 12.75 (323.8) 7/8" x 36; single horn contact SK000014-1475 14.75 (374.6) 7/8" x 36; single horn contact SK000014-1675 16.75 (425.4) 7/8" x 36; single horn contact SK000014-2375 23.75 (603.2) 7/8" x 36; single horn contact SK000014-3125 31.25 (793.7) 7/8" x 36; single horn contact SK000014-3175 31.75 (806.4) 7/8" x 36; single horn contact D Notes: 1. Horn button kit not included on steering column. Order part number 465611 separately. 2. Steering wheel nut included with column. 3. For column lengths not shown above, contact your Parker Sales Engineer. D29