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Section E
55 - 3
Dismantling and Assembly
Priority Inlet Section
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
Remove tie rod nuts 1 and end cover 2. Separate the valve
sections 3 take care not to lose shims 5. Remove and
discard 'O' rings 4.
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.
Inspect screen A, make sure the screen is clean and free of
dirt.
Take care not to lose ball bearing 17.
If required, the relief valve assembly 9 can be dismantled for
cleaning. It is important to note that this relief valve is fitted
as a standard part of the inlet section. However, in this
application it does not perform any duties. This is because
the steer system pressure is controlled by a relief valve in
the orbitrol steer unit (see Steering section), NOT relief valve
assembly 9.
After assembling the relief valve, screw the adjusting screw
18 fully into the valve housing. This will ensure assembly 9
does not interfere with the steer system pressure.
9803/3280
Hydraulics
Loader Valve - Variable Flow
Purchased from www.WorkshopManuals.co.uk
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 11 and 12
ALWAYS fit three shim (item 5) in between each valve block
section as shown.
After assembly, make sure the steering operates correctly.
The steer circuit will always have priority (see descriptions).
Torque Settings
Item
Nm
kgf m
1
41
4.1
7
67
6.9
9
67
6.9
13.5
1.38
16
Item
Description
Tie rod nuts
1
2
End cover
3
Valve section
4
O-ring
5
Shim
6
Tie rod
7
Plug
8
O-ring
9
Relief valve assembly
10
O-ring
11
O-ring
12
Back-up ring
13
Spring
14
Spool
15
Expansion plug
16
Shuttle plug assembly
17
Ball bearing
18
Adjusting Screw
Section E
55 - 3
lbf ft
30
50
50
10
Issue 1
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