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
9803/3280
Section E
55 - 5
Issue 1
Loader Valve - Variable Flow
