Hitachi GM7000 231327 - Manual (Page 26)

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Pressure Control Replacement
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 10.
1. Relieve pressure.
2. Disconnect both hoses at the pressure control
while holding the fitting or elbow (A) firmly. See the
CAUTION, below. Note the original location of
each hose to be sure you reassemble them cor-
rectly at the end of this procedure. See Fig. 21.
CAUTION
Do not allow the elbow (A) to turn when removing or
connecting the hoses. Turning the fitting or elbow
can shift the calibration of the pressure control.
3. Remove the four mounting screws and washers
(302, 303, 304) from the pressure control cover
(76). See Fig. 22.
4. Carefully remove the pressure control cover (76)
so as not to stress the cables.
5. Disconnect the black and white wires of the pres-
sure control cable (314) from the pressure control
cover.
6. Disconnect the potentiometer cable assembly
(310) from the pressure control cover.
7. Disconnect the red power lead (B) from the ON/
OFF switch.
8. Loosen the ground terminal screw (317) and
disconnect the ground lead (C).
9. Pull off the pressure control cover.
Fig. 21
63 76 TO
FIL-
TER
A
A
1 To the pump.
1
2 To the filter.
2
06873
06872A
Fig. 22
304
B
C
302
304
303
317
310
314
76
WARNING
Do not attempt to adjust or calibrate the pressure
control. If the pressure control is faulty, replace it.
10. Reassemble in the reverse order; attach ground
wire (C), power lead (B), and the black and white
connectors. Attach the pressure control cover (76)
using the four mounting screws and washers (302,
303, 304).