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
9803/3280
Section E
55 - 7
Issue 1
Loader Valve - Variable Flow