GHC SERIES
OM-05845
PAGE E-11
MAINTENANCE AND REPAIR
the shaft. Screw the rotor adjusting sleeve into the
backhead until the rotor bottoms against the head.
It is recommended that a new bearing lock
washer (03B) be installed any time the ro
tor adjusting sleeve is disassembled. Re‐
use of an old lockwasher may create a pre‐
load condition on the bearing, resulting in
premature bearing failure.
Install the bearing lockwasher (03B) using a suit
able tool (or special tool 48731-027 available from
Gorman‐Rupp) to screw the bearing locknut (03C)
onto the shaft until tight. Align one of the slots in the
locknut with one of the tabs on the lockwasher,
and use a hammer and punch to bend the tab on
the lockwasher over into the slot on the locknut.
Proceed with
Setting End Clearance
.
SETTING END CLEARANCE
(Figures E‐1 and E‐5)
The end clearance between the head (01AA) and
the face of the rotor (03A) should be checked and
adjusted as required as part of a regular preventive
maintenance schedule, when performance drops
or the pump is disassembled. If disassembled,
reassemble the rotor adjusting sleeve kit as pre
viously indicated, then proceed as follows for ad
justment.
Tighten the rotor adjusting sleeve assembly (07A)
in the backhead assembly (06A) until the rotor bot
toms against the head, and install the bearing lock
washer (03B) and locknut (03C) as previously de
scribed. See Figure E‐5 and mark the rotor adjust
ing sleeve (07AA) at the beveled mark on the back
head (06AA).
BEVELED MARK
ROTOR ADJUSTING SLEEVE (07AA)
BACKHEAD (06AA)
NOTCH
Figure E‐5.
End Clearance Adjustment
The end clearance between the head (01) and ro
tor shaft (03A) should be set to the dimensions
shown in Table E‐1. Each of the notches on the ro
tor adjusting sleeve (07AA) represents approxi
mately 0.002 inch of end clearance. Back off the ro
tor adjusting sleeve assembly (07A) approximately
1/2 turn, then turn the sleeve back in until the mark
is the appropriate number of notches counter
clockwise of the beveled mark on the backhead to
obtain the recommended end clearance.
Tighten the setscrews (GA) until they bottom
against the backhead (06AA). 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.
JG,JJ,JL,JP
.006
.006
.008
.010
Dimensions are shown in inches.
For Hydraulic Sizes Not Listed, Viscosities Above 250,000, or
for Special Applications, Consult Your Local Gorman‐Rupp
Distributor or the Factory.
750
2500 25,000 250,000
225
225
225
225
Max. Visc. (SSU)
Max. Temp. (
_
F)
HYD. SIZE
Notes:
Table E‐1. End Clearance
