Dismantling and Assembly
Auxiliary Relief Valves (ARV) and
Load Hold Check Valves (LHCV)
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.
The ARV's are identical in design but have different pressure
settings, refer to Technical Data.
The LHCV's are identical.
Dismantling
When removing 'O' rings and seals, use an 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.
Dismantle sub-assembly 14 from item 1 using a special tool
(see Service Tools). The special spanner locates in cross
holes B.
Make sure that small drilling A is not blocked.
Ensure good condition of seating faces on poppet 18 and on
the mating face of the valve block.
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.
Fit back-up ring 13 on the upper side of 'O' ring 12.
Fit flat face of sleeve 9 against shoulder of poppet 10.
Torque tighten item 14 using the special tool (see Service
Tools), until its shoulder seats firmly against item 1.
Pressure test the relief valves, refer to Service Procedures,
Loader Valve - Pressure Testing.
Torque Settings
Item Nm kgf m lbf ft
1 65 6.6 48
3 24 2.5 18
15 81 8.3 60
50 - 9
Section E
Hydraulics
9803/3280
Section E
50 - 9
Issue 1
Loader Valve - Fixed Flow
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