GHS SERIES
OM-05450
PAGE E-11
MAINTENANCE AND REPAIR
When the recommended clearance has been de
termined from Tables E‐1 or E‐2, adjust the end
clearance as follows.
(Figures E‐1 and E‐6)
Loosen the setscrews (GA) in the rotor adjusting
sleeve. Turn the rotor adjusting sleeve (07AA)
clockwise until the rotor bottoms against the head
(zero clearance), and install the bearing lockwash
er (03B) and locknut (03C) as previously de
scribed. See Figure E‐6 and mark the rotor adjust
ing sleeve (07AA) at the beveled mark on the back
head (06A).
BEVELED MARK
ROTOR ADJUSTING SLEEVE (07AA)
BACKHEAD (06AA)
NOTCH
Figure E‐6.
End Clearance Adjustment
Each of the notches on the rotor adjusting sleeve
(07AA) represents approximately 0.002 inch (0,05
mm) of end clearance. Back off the rotor adjusting
sleeve approximately 1/2 turn, then turn the sleeve
back in until the mark is the appropriate number of
notches counterclockwise of the beveled mark on
the backhead to obtain the recommended end
clearance.
Tighten the setscrews (GA) until they bottom
against the backhead (06A). Rotate the pump
shaft to ensure free rotation. If the rotor binds or
scrapes against the head, back off the rotor adjust
ing sleeve until rotation is free.
Rotate the pump shaft to ensure free rotation. If the
rotor binds or scrapes against the head, back off
the rotor adjusting sleeve until rotation is free.
RELIEF VALVE DISASSEMBLY
(Figure E‐7)
NOTE
If the relief valve is low pressure, it will have one in
ternal spring (10AE). If the relief valve is high pres
sure, it will have two internal springs (10AE and
10AF).
Unscrew the cap (10AN) from the bonnet (10AK).
Remove the optional gasket (10AP, if so equipped).
Back off the adjustment capscrew (10AM) to re
lieve pressure on the spring(s) (10AE and/or
10AF).
Unscrew the bonnet from the valve body (10AA)
and remove the gasket (10AJ) or O‐ring (10C). Re
move the valve (10AD) and spring(s) (10AE and/or
10AF). The spring guide (10AH) is an O‐ring fit in
the bonnet. Remove and discard the O‐rings.
If the warning plate (10AB) must be replaced, re
move the drive screws (BM), and remove the plate.
