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Section E
62 - 5
Dismantling and Assembly
Precision Control (Servo)
(Machines up to serial no. 931159)
Hydraclamp Valve
The numerical sequence shown on the illustration is intended
as a guide to dismantling. For assembly the sequence
should be reversed.
The following points MUST be avoided when dismantling
and assembling the valve:
•
CONTAMINATION
•
DAMAGE TO BALL SEAT AND PISTON
•
DAMAGE TO SEAL GROOVES
All or any of the above points may result in possible
problems with the valve.
When removing 'O' rings and seals, use an appropriately
rounded tool that WILL NOT cause any damage to the seal
grooves. Discard ALL 'O' rings DO NOT use worn or
damaged items.
Note that the hydraclamp comprises two separate valve
assemblies; the clamp valve assembly shown at A and the
solenoid assembly shown at B.
Dismantling
Unsecrew the clamp valve assembly A from the excavator
valve block. Withdraw the piston 3 from the excvator valve
block, if necessary use thin nose pliers.
Hold the body 1 and undo the spring retaining plug 4.
Withdraw the spring 5 and ball 6.
Undo the nut 7 and remove solenoid coil 8. Undo the valve
stem 9.
Make sure that all components and associated cross drillings
are clean and free from debris.
Inspect the valve components for scratches, nicks or any
other type of damage, particularly on the ball and seat faces.
Carefully inspect the outside diameter of the piston 3 and its
bore in the excavator valve block for damage or excessive
wear. Renew components as required.
Assembly
Renew all 'O' rings.
Lubricate parts with JCB Hydraulic Fluid before assembling.
Make sure that all the parts move freely.
Ensure that the small drilling C in the piston 3 is clear.
Do not over-tighten the solenoid assembly, it may affect the
operation of the solenoid, use the spanner flats and torque
tighten to figure indicated in the table.
9803/3280
Hydraulics
Excavator Valve
Purchased from www.WorkshopManuals.co.uk
Check the operation of the electric hydraclamp, refer to
Circuit Descriptions, Excavator Valve - Precision Control
- Hydraclamp Valve Operation.
Torque Settings
Item
Nm
kgf m
4
8 - 11
0.8 - 1.1 6 - 8
7
4.7 - 6.1 0.5 - 0.6 3.5 - 4.5
9
41 - 48
4.1 - 5
1
4
5
A
A402950
Section E
62 - 5
lbf ft
30 - 36
2
6
C
3
9
8
7
10
B
Issue 1
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