Regulator Valve Adjustment; Flow Regulator Spool; Pressure Regulator Spool - jcb 214e Service Manual

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Section E
22 - 5
Variable Flow Pumps

Regulator Valve Adjustment

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/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.
Rep eat p ressure t est as d et ailed p reviously and
5
establish valve is set correctly.
Tighten locknut, refit cap.
6
B
9803/3280
Hydraulics
Service Procedures
2
) greater than the pressure in
A
S273401
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Pressure Regulator Spool

As previously explained, there is no 'main relief valve' to
control the system pressure (the pump swashplate angle will
increase or decrease according to pressure demand).
However in situations of maximum hydraulic stall, i.e. ram full
travel, the pressure in the circuit will achieve the setting of
the pressure regulator spool. To adjust the setting:
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 F and loosen locknut G.
4 Turn adjusting screw H clockwise to increase pressure
setting and anti-clockwise to decrease setting.
Rep eat p ressure t est as d et ailed p reviously and
5
establish valve is set correctly.
6 Tighten locknut, refit cap.
F
G
H
S273100
Section E
22 - 5
C
D
E
Issue 1