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Section E
2 - 10
Relief Valve Pressures
Excavator Valve - Precision Control (Servo)
(Machines up to serial no. 931159)
*
Boom Ram Head Side
Boom Ram Rod Side
Bucket Ram Head Side
Bucket Ram Rod Side
Dipper Ram Head Side
Dipper Ram Rod Side
Slew Left and Right
Load Sense Relief Valve †
Note: Instructions for pressure testing and adjustment are described in Service Procedures, Loader Valve - Pressure
Testing.
† Note: For pressure testing and adjustment of the load sense relief valve, see Service Procedures, Pressure Testing, Load
Sense Drain Regulator and Relief Valve.
Component Key:
1
Bucket
2
Dipper
3
Stabiliser
4
Stabiliser
5
Boom
6
Slew
7
Auxiliary relief valve
8
Tank port
8
9803/3280
Technical Data
1
2
15
7
7
10
10
10
11
11
11
10
10
10
7
7
Purchased from www.WorkshopManuals.co.uk
Hydraulics
bar
248 - 255
345 - 352
248 - 255
248 - 255
248 - 255
248 - 255
262 - 269
208 - 212
9
Pilot operated check valve (hydraclamp)
10
Service ports
11
Load sense valve
12
Load sense drain regulator and relief valve
13
Inlet port
14
Hydraclamp solenoid
15
Auxiliary spool
5
3
4
7
10
10
10
11
11
11
10
10
10
7
Section E
kgf/cm
lbf/in
2
2
253 - 260
3600 - 3700
351 - 358
5000 - 5100
253 - 260
3600 - 3700
253 - 260
3600 - 3700
253 - 260
3600 - 3700
253 - 260
3600 - 3700
267 - 274
3800 - 3900
213 - 216
3025 - 3075
6
12
7
10
13
11
10
9
7
14
2 - 10
A402500
Issue 3*
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