55 - 5
Dismantling and Assembly
Auxiliary 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.
Care must be taken to ensure that the spool 13 is not
damaged when removing it from the valve block.
Hold the spool in a suitable clamp, unscrew bolt 14 and
remove spring 17, spacer 16 and cups 15 and 18.
Assembly
Renew all 'O' rings and back-up rings.
When fitting bolt 14, clean the threads then apply a small
quantity of JCB Threadlocker & Sealer to the threads of the
spool.
When fitting spool seals 19 and 20 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
14 8 0.8 6
21 67 6.9 50
25 13.5 1.38 10
26 13.5 1.38 10
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 Centering spring housing
13 Spool assembly
14 Bolt
15 Spring cup
16 Spacer
17 Spring
18 Spring cup
19 O-ring
20 O-ring
21 Plug
22 O-ring
23 Spring
24 Poppet
25 Primary shuttle housing
26 Shuttle plug assembly
27 Ball bearing
Section E
Hydraulics
9803/3280
Section E
55 - 5
Issue 1
Loader Valve - Variable Flow
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