2 - 1
Section E
Hydraulics
9803/7130
Section E
2 - 1
Issue 1
Technical Data
System Type An engine driven gear pump provides a fixed flow
output to supply the steering, loader and excavator
hydraulic circuits. This is supplemented by an auxiliary
gear pump on some machine configurations where
additional flow is required.
Main Hydraulic Pump
Model/Reference Single/67910
Rotation Clockwise
Mounting Engine Timing Case
Flow at 2000 rev/min and system pressure litres/min UK gal/min US gal/min
72 15.84 19.02
Auxiliary Hydraulic Pump (if fitted)
Model/Reference Single/4240J
Rotation Anti-Clockwise
Mounting Auxiliary Take-Off
Flow at 2000 rev/min and system pressure litres/min UK gal/min US gal/min
28 6.16 7.39
Relief Valve Operating Pressures bar kgf/cm
2
lbf/in
2
Main Relief Valve (M.R.V.) 227 232 3300
Auxiliary Relief Valves (A.R.V.)
Loader
Shovel Ram Head Side (pilot-operated) 241 246 3500
Shovel Ram Rod Side (pilot-operated) 275 281 4000
Auxiliary Ram Head Side (direct acting) 241 246 3500
Auxiliary Ram Rod Side (direct acting) 241 246 3500
Excavator
Slew Ram Head Side 262 267 3800
Slew Ram Rod Side 262 267 3800
Boom Ram Head Side 248 253 3600
Boom Ram Rod Side 316 267 4495
Dipper Ram Head Side 248 253 3600
Dipper Ram Rod Side 248 253 3600
Bucket Ram Head Side 248 253 3600
Hydraulic Tool Circuit (HTC) (if fitted) 138 141 2000
Return Line Filter bar kgf/cm
2
lbf/in
2
By-pass pressure 1.72 1.76 25
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