Joystick Controllers
Dismantling and Assembly
Dismantling
The illustration shown on the opposite page is intended as a
guide to dismantling. Be sure to note the location of all
components when dismantling. Although some components
may appear to be identical they are not interchangeable.
Make sure that components are assembled in their original
positions.
Great care should be taken when dismantling and
assembling a valve to avoid the following:-
• Contamination
• Damage to spools
• Damage to seal grooves
Any of the above may result in possible problems with the
operation of the valve.
1 Remove the joystick controller from the machine, refer
to Joystick Controller - Removal and Replacement.
2 Carefully prise back the rubber gaiter 1, loosen lock nut
2 and unscrew the handle 3.
3 Unscrew the universal joint assembly 4. Take care to
keep all the shims 5 together.
4 Remove the retaining plate 6. Carefully withdraw the
regulating valve assemblies 7 from the valve body 8.
Assembly
Assembly is the reverse of the dismantling sequence.
1 Clean the valve components in an appropriate solvent.
2 Renew all 'O' rings and back-up rings.
3 Lubricate parts with JCB Hydraulic Fluid before
assembling. Make sure that all the parts move freely.
Torque Settings
Item Nm kgf m lbf ft
2 40 4.1 29.5
4 50 5.1 36.9
Regulating Valve Assemblies
Each of the regulating valve assemblies 7 can be removed
as shown. Care must be taken to ensure that the spool is
not damaged when removing it from the valve body. Note
that all spools are similar in appearance but must not be
interchanged as they are matched to their bores. All spools
have the same centring and sealing components.
50 - 3
Section D
Controls
9803/3280
Section D
50 - 3
Issue 1
Precision Control (Servo)
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