This article explains how to adjust the valve adjustment on a JCB loader
Note: If a new regulator valve is fitted, or a valve stripped,
cleaned and rebuilt, then the pressure spool should be
backed off to a low pressure. This will prevent inadvertent
damage to the pump.
Flow Regulator Spool
The pressure in the pump out line (pressure test connector
B) should be 20 bar (290 lbf/in2) greater than the pressure in
the load sense line (pressure test connector A). If not adjust
the regulator flow spool as described below:
1
Lower the backhoe bucket and loader shovel to rest on
the ground; stop the engine; operate the control levers
to vent residual hydraulic pressure.
2
Gain access to the regulator valve assembly (mounted
on the pump).
3
Remove cap C and loosen locknut D.
4
Turn adjusting screw E clockwise to increase pressure
setting and anti-clockwise to decrease setting.
5
Repeat pressure test as detailed previously and
establish valve is set correctly.
6
Tighten locknut, refit cap
