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Section E
2 - 8
Relief Valve Pressures
Excavator Valve - Fixed Flow
Boom Ram Head Side
Boom Ram Rod Side
Bucket Ram Head Side
Centremount (17' , 15' 6" backhoe - except knuckle)
Centremount (14' backhoe, 15' 6" backhoe with a knuckle fitted) 248 - 255
Sideshift
Bucket Ram Rod Side (Machines with Rockbreaker only)
Dipper Ram Head Side
Dipper Ram Rod Side
Slew Left and Right
Weight:
44 kg (97 lbs) - Centremount
46 kg (101 lbs) - Sideshift
Note: Instructions for pressure testing and adjustment are described in Service Procedures, Loader Valve - Pressure
Testing.
† System shown is for JCB plus pattern and JCB diagonal pattern. For ISO system, the boom and dipper spools change
position, i.e. boom is position 2 and dipper is position 5. The bottom ARV from spool 5 will also be swapped with the
bottom ARV from spool 2.
Component Key:
1
Bucket crowd
2
Dipper †
3
Stabiliser
4
Stabiliser
5
Boom †
6
Slew
7
Auxiliary relief valve
8
9
9803/3280
Hydraulics
Technical Data
1
2
7
0
0
!
!
0
0
7
7
Purchased from www.WorkshopManuals.co.uk
bar
248 - 255
345 - 352
310 - 317
248 - 255
248 - 255
248 - 255
248 - 255
262 - 269
8
Tank port
9
High pressure carry-over (HPCO) port
10
Service ports
11
Load hold check valve assemblies
12
Make-up check valve assembly
13
Inlet port
14
Hydraclamp solenoid
3
4
5
7
0
0
0
!
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0
0
0
7
Section E
kgf/cm
lbf/in
2
2
253 - 260
3600 - 3700
351 - 358
5000 - 5100
316 - 323
4500 - 4600
253 - 260
3600 - 3700
253 - 260
3600 - 3700
253 - 260
3600 - 3700
253 - 260
3600 - 3700
253 - 260
3600 - 3700
267 - 274
3800 - 3900
6
7
0
£
!
@
0
7
A401470
2 - 8
$
Issue 2*
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