Dismantling and Assembly
Standard 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
Remove the lever linkage from the tang (lever) end of the
spool.
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 8 is not
damaged when removing it from the valve block.
Hold the spool in clamp 992/10100, unscrew bolt 9 and
remove spring 12, spacer 10 and cups 11 and 13.
Check for surface contamination on the under side of the
seal plates 2 and 14. 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
section 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 spool through the valve block, do 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 bolt 9, 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 all the parts move freely, check that
item 10 does not interfere with item 13.
9 Renew 'O' ring15. Make sure the 'O' ring is not trapped
or damaged.
10 Fit seal 15 and seal plate 14 to the valve block section.
Torque tighten capscrew 5 on completion.
Re-connect the lever mechanism to the tang (lever) end of
the spool.
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
9 9.5 0.96 7
50 - 13
Section E
Hydraulics
9803/3280
Section E
50 - 13
Issue 1
Loader Valve - Fixed Flow
To Next Page
Loading...
Need help?
General
