16 - 5
Main Relief Valve and Auxiliary Relief
Valves
Note: The M.R.V. X and loader valve A.R.V.'s Y are identical
in design.
Removal
(Assumes seat and floor plate removed.)
Ensure that the engine is stopped and hydraulic pressure
released from the system.
Each valve is removed by unscrewing nut 1.
Dismantling and Assembly
The manufacturers do not recommend renewing individual
components of the M.R.V. or A.R.V.'s. Each valve should be
renewed as a unit if a component is defective.
Renew all 'O' rings. Lubricate parts with JCB 'Special'
Hydraulic Fluid before assembly.
The M.R.V. can be tested/adjusted in situ (see page E/16 - 6).
The A.R.V's are tested/adjusted on a bench (see page E/16 - 7).
Replacement
Replacement is a reversal of the removal procedure.
Torque Settings
Item Nm kgf m lbf ft
1 44.75 4.6 33
Section E
Hydraulics
9803/8500
Section E
16 - 5
Issue 3
Valves
S167881
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