55 - 9
Dismantling and Assembly
Loader Lift 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 18 is not
damaged when removing it from the valve block.
Hold the spool in a suitable clamp, use a punch to separate
detent shaft 19 from coupling 20. Unscrew coupling 20 and
remove spring 22, spacer 23 and cups 21 and 24.
Use a suitable press to compress spring 14 and remove
retaining ring 12. Take care not to lose detent balls 16.
Assembly
Renew all 'O' rings and back-up rings.
When fitting coupling 20, clean the threads then apply a
small quantity of JCB Threadlocker & Sealer to the threads
of the spool.
When fitting spool seals 26 and 27 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
20 8 0.8 6
28 13.5 1.38 10
29 13.5 1.38 10
31 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 Capscrew
11 Detent housing
12 Retaining ring
13 Retainer
14 Spring
15 Piston
16 Detent balls
17 Washer
18 Spool assembly
19 Detent shaft
20 Pivot coupling
21 Spring cup
22 Spring
23 Spacer
24 Spring cup
25 O-ring
26 O-ring
27 O-ring
28 Primary shuttle housing
29 Shuttle plug assembly
30 Ball bearing
31 Plug
32 O-ring
33 Spring
34 Poppet
Section E
Hydraulics
9803/3280
Section E
55 - 9
Issue 1
Loader Valve - Variable Flow
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