Dismantling and Assembly
Electric Detent Spool - Manual
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
When removing ' O' rings and seals, use an appropriately
rounded tool that WILL NOT cause any damage to the spool
or seal grooves, for instance, item
3
, which is a wiper seal
and is a press fit in the counterbore.
Care must be taken to ensure that the spool
12
is not
damaged when removing it from the valve block.
Use tool 992/10100 to hold the spool, remove circlip
13
and
'clapper'
14
. Unscrew spool end
15
and remove spring
17
with cups
16
and
18
.
Check for surface contamination on the under side of the
seal plates
2
,
8
and
10
. Clean if necessary. Check for the
flatness of the seal plate. If found to be bent - replace with
new (any work previously carried out on this valve may have
resulted in the bending of the seal plate).
Assembly
1
Fit the boot
1A
to the seal plate
2
.
2
Fit a new lipseal
4
into the valve block, ensure square.
Fit wiper
3
on top of lipseal.
3
Fit the seal plate and boot assembly to valve block but
do not torque tighten capscrews
1
at this stage. Ensure
wiper locates into seal plate.
4
Use clean hydraulic oil as a lubricant. From the bottom,
insert sp ool t hrough t he valve b loc k, d o not use
excessive force when fitting, a turning motion should
ease the spool through the valve block.
5
Check that the tang end of the spool passes through
the boot without dislodging or damaging the boot.
Ensure that the tang aligns with the control rod and
that the boot is not distorted and is located in the spool
land.
6
Torque tighten cap screws
1
.
7
When fitting spool end
15
, clean the threads thoroughly
using JCB Cleaner/Degreaser, leave it for 10 minutes
then apply a small quantity of JCB Threadlocker and
Sealer to the threads of the spool.
8
Make sure that the chamfer on item
14
faces away from
the solenoid, item
6
.
9
Renew lipseal
11
. Make sure the lipseal is not trapped
or damaged.
10
Fit lipseal
11
and seal plate
10
to the valve block
section. Torque tighten capscrew
5
on completion.
Check the operation of the solenoid
6
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.
Run the engine and inspect the valve for external leaks.
Torque Settings
Item
Nm
kgf m
lbf ft
1
9.5
0.96
7
5
9.5
0.96
7
15
9.5
0.96
7
50 - 17
Section E
9803/3280
Section E
50 - 17
Issue 1
Loader Valve - Fixed Flow
