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Section E
62 - 4
Dismantling and Assembly
Precision Control (Servo)
(Machines up to serial no. 931159)
Load Sense Drain Regulator and Relief Valve
The numerical sequence shown on the illustration is intended
as a guide to dismantling.
Note that components 6 - 13 can be dismantled and
assembled without disturbing components 1 - 5. If
components 1 - 5 are dismantled, the valve must be reset to
the correct operating pressure after assembly.
For assembly the sequence should be reversed.
Great care should be taken when dismantling and
assembling a valve to avoid the following:-
Contamination
Damage to spools
Damage to seal grooves
Any of the above may result in possible problems with the
operation of the valve.
When Dismantling
When removing 'O' Rings and seals, use an appropriatly
rounded tool that WILL NOT cause any damage to the seal
grooves.
Discard ALL 'O' Rings and back-up rings. DO NOT use
worn or damaged items.
Inspection
Inspect the valve components for scratches, nicks or any
other type of damage, replace with new if required.
When Assembling
Renew all 'O' rings and back-up rings.
Lubricate parts with JCB Hydraulic Fluid before assembling.
Make sure that all the parts move freely.
Make sure that the 'O' rings and back-up rings are fitted the
correct way, items 7 and 8.
Be sure to fit filter screen 11 the correct way round.
Adjust pressure setting as required.
Torque Settings
Item
Nm
kgf m
1
8 - 11
0.8 - 1.1
9803/3280
Hydraulics
Excavator Valve
lbf ft
6 - 8
Purchased from www.WorkshopManuals.co.uk
Section E
62 - 4
Issue 2*
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