Dismantling and Assembly
Main Relief Valve (MRV)
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 SPOOL
• DAMAGE TO SEAL GROOVES
All or any of the above points may result in possible
problems with the valve.
Dismantling
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 and back up rings. DO NOT use worn
or damaged items.
Inspect the valve components for scratches, nicks or any
other type of damage, replace with new if required.
Assembly
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 10 and 11.
Adjust pressure setting as required, refer to Service
Procedures, Loader Valve - Pressure Testing.
Torque Settings
Item Nm kgf m lbf ft
3 5.4 0.6 4
50 - 7
Section E
Hydraulics
9803/3280
Section E
50 - 7
Issue 1
Loader Valve - Fixed Flow
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