55 - 7
Dismantling and Assembly
Loader Shovel Spool
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 spool
or seal grooves.
Place a suitable rod through the eye end of spool 21.
Care must be taken to ensure that the spool 21 is not
damaged when removing it from the valve block.
Hold the spool in a suitable clamp, Unscrew coupling 22 and
remove spring 24 and cups 23 and 25.
Relief valve assembly 30 can be dismantled for cleaning
purposes only. Individual parts for the relief valve are not
available (except seal kits).
Assembly
Renew all 'O' rings and back-up rings.
Inspect gasket 14, replace with a new one if required.
When fitting coupling 22, clean the threads then apply a
small quantity of JCB Threadlocker & Sealer to the threads
of the spool.
Check the operation of the solenoid 12 after assembly by
connecting a 12V supply . The spool should be held when it
is pushed into the detent position and returned when the
supply is disconnected.
When fitting spool seals 34 and 35 refer to the procedure
Fitting Spool Seal.
ALWAYS fit three shim (item 5) in between each valve block
section as shown.
Run the engine and inspect the valve for external leaks.
Torque Settings
Item Nm kgf m lbf ft
1 41 4.1 30
6 6 0.55 4
10 8 0.8 6
15 2.7 0.27 2
22 11 1.1 8
26, 30 67 6.9 50
Item Description
1 Tie rod nuts
2 End cover
3 Valve section
4 O-ring
5 Shim
6 Bolt
7 Dust boot
8 Dust guard
9 Seal
10 Bolt
11 Washer
12 Detent Solenoid
13 Tube
14 Gasket
15 Capscrew
16 Washer
17 Armature Plate
18 Spring
19 Centering Spring Housing
20 O-ring
21 Spool
22 Coupling
23 Spring cup
24 Spring
25 Spring cup
26 Plug
27 O-ring
28 Spring
29 Poppet
30 Relief valve assembly
31 O ring
32 Back-up ring
33 O-ring
34 O-ring
35 O-ring
36 Primary shuttle housing
37 Shuttle plug assembly
38 Ball bearing
Section E
Hydraulics
9803/3280
Section E
55 - 7
Issue 1
Loader Valve - Variable Flow
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