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Section E
2 - 5
Relief Valve Pressures
Loader Valve - Precision Control (Servo)
(Machines up to serial no. 931159)
*
Main Relief Valve (M.R.V.)
Unloader Valve
Auxiliary Relief Valves (A.R.V.)
Loader
Shovel Ram Head Side
Shovel Ram Rod side
Bolt on Auxiliary Spool (extending dipper, if fitted)
Top relief valve
Bottom relief valve
Note: Instructions for pressure testing and adjustment are described in Service Procedures, Loader Valve - Pressure
Testing.
Component Key:
1
Arms lift service
2
Shovel service
3
Auxiliary (optional)
4
Pump section 1 - inlet
5
Pump section 2 - inlet
6
Pressure test port
7
Unloader Assembly
8
Unloader solenoid
9
Auxiliary relief valve
10
Tank port
11
High pressure carry-over (HPCO) port
12
Service ports
13
Load hold check valve assemblies
14
Main relief valve (MRV)
15
Bolt on auxiliary spool
16
Data plate
9803/3280
Hydraulics
Technical Data
5
Purchased from www.WorkshopManuals.co.uk
bar
kgf/cm
227 - 231
232 - 235
203 - 207
207 - 211
172 - 175
175 - 179
308 - 312
315 - 318
136 - 140
139 - 142
205 - 208
209 - 212
1
7
15
9
8
@
@
6
13
@
@
4
9
14
Section E
2
lbf/in
2
3300 - 3350
2950 - 3000
2500 - 2550
4475 - 4525
1975 - 2025
2975 - 3025
2
3
9
@
@
13
13
16
@
@
9
A402480
Issue 3*
2 - 5
10
11
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