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
9803/3280
Section E
50 - 9
Issue 1
Loader Valve - Fixed Flow
