OM--04621
GHA SERIES
PAGE E--10
MAINTENANCE AND REPAIR
(06AE). If so equipped, press the second bearing
(06AS) into the throttle bushing sleeve until fully
seated against the first bearing.
Install a new gasket (06B) over the throttle bushing
sleeve (06AD). Secure the backhead assembly
(06A) to the housing (04A) with the capscrews (B).
Secure the foot bracket (08A) to the backhead as-
sembly (06A) with the previously removed hard-
ware (B and D).
Backhead Kit (06
)
Reassembly
(Packing Seal or Clamped Seat Seal Options
Only)
Packing and clamped seat seal pumps use a shaft
bushing in place of the shaft bearing (06AE) shown
in Figure E-1.
Use an arbor (or hydraulic) press and a suitably
sized sleeve to press the shaft bushing (06AE) into
the throttle bushing sleeve (06AD) until it is flush
with the face of the sleeve.
Position the backhead (06AA) on the bed of an ar-
bor (or hydraulic) press with the rotor end facing
up. Use an arbor (or hydraulic) press to install the
assembled throttle bushing sleeve and throttle
bushing in the backhead until fully seated.
Install a new gasket (06B) over the throttle bushing
sleeve (06AD). Secure the backhead assembly
(06A) to the housing (04A) with the capscrews (B).
Secure the foot bracket (08A) to the backhead as-
sembly (06) with the previously removed hardware
(B and D).
Rotor/Shaft (03) Installation
Inspect the rotor/shaft assembly (03A) for exces-
sive wear, scoring or scratches along the shaft
sealing surface. If replacement is required, the
shaft and rotor must be replaced as an assembly.
Small scratches can be dressed with a fine file or
emery cloth. Replace the rotor/shaft assembly or
any other parts if wear or damage is extensive.
If your pump is equipped with a mechanical seal,
the seal assembly must be installed before instal-
ling the rotor/shaft assembly. Refer to
Seal Appen-
dix, Section F
, for installation of the seal and re-
lated components. After installing the seal, slide
the rotor/shaft assembly into the housing and
backhead.
Head/Idler Kit (01 and 02)
(Figures E-1 and E-3)
Use caution when handling the idler (02A)
and the rotor shaft assembly (03A). These
parts have sharp edges which will grow
sharper with use.
If the idler pin (01AB) was removed, apply Loctite
No. 565 PST pipe sealant to the I.D. of the idler pin
bore in the head (01AA). Position the pin in the
head with the larger diameter chamfered end to-
ward the head. Use an arbor (or hydraulic) press to
press the pin into the head until it bottoms out.
NOTE
When properly installed, the pin will be positioned
0.010 inch below the surface of the crescent.
The pipe plugs (P)
must
be installed in the
holes in the head. Otherwise, abrasive liq-
uid will be circulated to the idler pin, result-
ing in excessive wear to the pump. Install
the pipe plugs (P) in the side of the head.
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). If so equipped,
install the idler pin sleeve (01AG). Install the idler
assembly (02). 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
