Series 51 Hydraulic Proportional Controls HZ, HA ... - Sauer-Danfoss

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Series 51 Hydraulic Proportional Controls Service Manual HP Controls Operation Functional Description The HP and HC two-line hydraulic proportional controls vary the motor displacement between maximum and minimum by feeding hydraulic signal pressure to both ends of a piston. A pin connects the piston to the 4-way valve. A threshold spring and ramp spring(s) act on the opposite end of the 4-way valve. As deferential pressure moves the piston, it shifts the 4-way valve that ports servo supply pressure to the ends of the servo piston. A threshold spring and ramp spring(s) act on the opposite end of the 4-way valve. The threshold adjustment screw varies the threshold spring force and the signal pressure required to move the 4-way valve and start the change in displacement. The ramp spring(s)—two used in 160 cc and 250 cc motors, one in 80 cc and 110 cc motors—increases the force on the 4-way valve as the servo piston moves toward minimum displacement. This provides a motor displacement proportional to the input signal delta pressure. Optional orifices at locations T1, T2, T3, T7, and T8 regulate shift speed. HP Schematic Diagram XB XA P101 871 26 11009446 • Rev AC • November 2010 A B M4 M3 Max. displ. X2 X1 HP Control The HP control consists of a ported housing that mounts onto the multifunction block. The ported housing contains a shuttle valve, a piston, a connecting pin, and a bias spring. Shuttle Valve The shuttle valve ports higher signal pressure to the top of the piston. It ports lower signal pressure to the bottom of the piston. Connecting Pin The connecting pin links the piston to the 4-way valve. The bias spring holds the piston and pin against the 4-way valve. M1 L1 L2 M5 M2
Series 51 Hydraulic Proportional Controls Service Manual HP Controls Repair Disassembly 1. Using a 4 mm internal hex wrench remove screws (M36). 2. Remove the housing cover (M10). Remove gasket (M12). 3. Remove spring (M16). 4. Remove housing (M1HP) with the shuttle valve assembly. 5. Remove the pilot piston (M14). Remove and discard O-ring (M24). 6. Remove pin (M18) from the multifunction block. 7. Use screw (M36) as a threaded puller to remove plug (M28). Remove O-ring (M30). 8. Remove shuttle spool (M26). 9. Remove plug (M32). Remove O-ring (M30). HP Control Legend 11009446 • Rev AC • November 2010 M30 M12 M26 M30 M10 Item Wrench size Torque M18 M36 4 mm internal hex 6.4 Nm [4.7 lbf•ft] M14 M24 M16 P101 873 27
Page 1 and 2: Series 51 Hydraulic Proportional Co
Page 3 and 4: Introduction Pressure measurements
Page 5 and 6: Safety Precautions Series 51 Hydrau
Page 7 and 8: Overview General Instructions Serie
Page 9 and 10: General Description (continued) Ser
Page 11 and 12: Port locations and Gauge Installati
Page 13 and 14: Pressure Compensator OverRide (PCOR
Page 15 and 16: Optional PCOR Housing (continued) S
Page 17 and 18: Optional Multifunction block (conti
Page 25: Series 51 Hydraulic Proportional Co
Page 31 and 32: Repair (continued) Series 51 Hydrau
Page 35 and 36: Repair (continued) C Caution! Read

Series 51 Hydraulic Proportional Controls HZ, HA ... - Sauer-Danfoss

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