OM-05845
GHC SERIES
PAGE E-10
MAINTENANCE AND REPAIR
faces are clean, undamaged and free if any foreign
matter. Set aside and cover the seal stationary ele
ment and O‐ring; they will not be used until the ro
tor adjusting sleeve assembly (07A) is installed.
Position the pump on a flat surface with the drive
end facing up. Lightly oil the shaft of the rotor/shaft
assembly (03A). Slide the spring centering washer
and spring onto the shaft until fully seated against
the shaft shoulder.
Position the rotating portion of the seal on the shaft
with the sealing face toward the drive end of the
shaft. Place a clean tissue over the sealing face of
this rotating subassembly and slide it onto the
shaft until the seal retainer seats squarely against
the spring.
Assemble the rotor adjusting sleeve assembly
(07A) as described in
Rotor Adjusting Sleeve
and
position it on a flat surface with the drive end down.
Oil the O‐ring (O) and install it in the groove in the
O.D. of the rotor adjusting sleeve assembly (07A).
Lubricate the stationary element O‐ring and posi
tion the stationary element in the rotor adjusting
sleeve assembly with the sealing face up. Cover
the sealing face with a clean tissue and use thumb
pressure to press the stationary element into the
seat sleeve until fully seated. Remove the tissue
and proceed with pump reassembly.
Head/Idler Kit
(Figures E‐1 and E‐3)
If the idler pin (01AB) was removed, heat the head
(01AA) in an oven to 500
F (260
C) to ease instal
lation of the pin. Carefully install the pin in the head
with the chamfer side toward the head and the
milled flat side facing the crescent. (If the pin is
stepped, position it with the large chamfered end
toward the head.) Make sure the pin bottoms out in
the head.
NOTE
When properly installed, the pin will be positioned
0.010 inch below the surface of the crescent.
If removed, install the pipe plug (P) in the hole in the
suction side of the head (01AA).
Lightly oil the I.D. of the idler (02A), and use an ar
bor (or hydraulic) press to install the idler bushing
(02B) in the idler. The bushing should be centered
at both ends of the idler.
Place the head (01A) on a flat surface. Lightly oil the
idler bushing (02B) and pin (01AB); install the idler
assembly (02) on the pin. Spin the idler to make
certain that it moves freely on the pin.
Install the head gasket (01B) over the head. Care
fully position the head and idler against the hous
ing and engage the idler and rotor/shaft assembly
(03A).
Turn the rotor/shaft until the idler and rotor
teeth engage.
Do not
force.
Slide the head into the housing assembly. Rotate
the head assembly (01A) until the groove in the
head matches the groove in the housing. Secure
the head to the housing with the capscrews (B).
Rotor Adjusting Sleeve (07)
(Figures E‐1 and E‐2)
Clean the rotor adjusting sleeve and all component
parts as described in
Cleaning and Inspection
.
Inspect the parts for wear or damage and replace
as necessary.
Press the bearing (07AC) into the rotor adjusting
sleeve (07AA) until it bottoms out on the shoulder in
the rotor adjusting sleeve.
Apply 1 to 2 drops of “Loctite Thread Locker No.
272” or equivalent compound to the threads of the
bearing retaining nut (07AD) and use a suitable
spanner wrench (or special tool 48731-028 avail
able from Gorman‐Rupp) to screw the nut into the
rotor adjusting sleeve (07AA) until fully seated
against the bearing.
NOTE
Part or all of the seal assembly (05) must be in
stalled with the rotor adjusting sleeve. Check the
Parts List
furnished with your pump to identify the
seal, refer to
Seal Appendix
,
Section F
for installa
tion of the seal and related components, then pro
ceed as follows with rotor adjusting sleeve installa
tion.
Use caution
not to damage seal parts when
installing the rotor adjusting sleeve.
Loosen the socket head setscrews (GA). Slide the
rotor adjusting sleeve kit over the shaft. Use cau
tion not to damage installed seal components on
