Group 30, Hydraulic Control Valve/Lift Circuit
SM 765, Nov ’06 Hydraulic Control Valve/Lift Circuit Specifications and Description • 30-1-1
Specifications
Hydraulic Fluid Type: Clark specification MS-68 (Clark
part #1802155 and #1800236)
Main Relief Valve Setting: 20.6 to 21.1 MPa (2988 to
3060 psi) at rated flow.
Auxiliary Relief Valve Setting: 13.7 to 14.2 kPa (1987 to
2060 psi) at rated flow.
Rated Flow: 76 L/min (20 gpm).
Maximum Pressure Drop at Rated Flow:
Inlet to outlet: 689 kPa (100 psi).
Lift spool (spool #l):
− Inlet to cylinder port: 689 kPa (100 psi)
− Cylinder port to outlet: 550 kPa (80 psi).
Tilt spool (spool #2):
− Inlet to cylinder port: 689 kPa (100 psi)
− Cylinder port to outlet: 550 kPa (80 psi).
Auxiliary spools (spools #3 and #4):
− Inlet to cylinder port: 345 kPa (50 psi)
− Cylinder port to outlet: 207 kPa (30 psi).
Service Intervals
Hydraulic System Relief Pressure Check: Every year or
every 2000 hours of operation.
Section 1
Hydraulic Control Valve/Lift Circuit
Specifications and Description
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