Gorman-Rupp Pumps PAH3B60-4045H 1493144 and up - Manual (Page 47)

PAH SERIES OM-06474
MAINTENANCE & REPAIR PAGE E - 24
aid this process. The I.D. of the tube should be
slightly larger than the O.D. of the shaft sleeve (7).
Install the shaft sleeve O‐ring (8) in the groove in
the I.D. of the sleeve. Lubricate the O‐ring and the
O.D. of the shaft sleeve with “P-80
R
Emulsion” or
water. Do not use oil or any substitute lubricant
other than water.
Slide the rotating subassembly (consisting of the
rotating element, retainer and bellows) onto the
sleeve until the rotating element is just flush with
the chamfered end of the sleeve. Slide the shaft
sleeve and rotating subassembly onto the shaft
until the seal faces contact and the shaft sleeve
seats against the shoulder on the impeller shaft.
Install the seal spring and spring centering washer.
Lubricate the seal assembly as indicated in
LUBRICATION, after the impeller has been in­
stalled.
Impeller Installation And Adjustment
(Figure 6)
Inspect the impeller (4) and replace it if cracked or
badly worn.
Install the same thickness of adjusting shims (5) as
previously installed. Install the impeller key (26) in
the shaft keyway. Align the keyway in the impeller
with the shaft key and press the impeller onto the
shaft until fully seated.
A clearance of .025 to .040 inch (0,64 to 1,02 mm)
between the impeller and the seal plate is neces­
sary for maximum pump efficiency. Measure this
clearance and add or remove impeller adjusting
shims as required.
Apply `Loctite Retaining Compound No. 242' or
equivalent to the threads of the impeller capscrew
(2). Install the roll pin (4) in the hole in the impeller.
Position the impeller washer over the end of the im­
peller shaft so the hole in the washer aligns with the
roll pin. Use a strap wrench to block impeller rota­
tion and torque the impeller capscrew to 180 ft. lbs.
(24,9 m. kg.).
Pump Casing Installation
(Figure 5)
Lubricate the O‐ring (5A) with light grease and in­
stall it in the groove in the O.D. of the seal plate.
Install a lifting eye in the uppermost hole in the
pump casing (1) for the pipe plug (8). Be sure to
screw the lifting eye tightly into the hole as far as it
will go. Attach a sling and suitable lifting device to
the lifting eye and use the lifting device to position
the pump casing over the rotating assembly. Install
the hardware (1 and 2) on the studs (6A) and use
the hardware to fully seat the pump casing against
the seal plate.
See Figure 4. If the suction spool (6) was removed,
install a new gasket (4) and secure the spool to the
pump casing with the previously removed hard­
ware (11 and 12).
Suction Head and Wear Ring Installation
(Figure 5)
If the wear ring (4) was removed, position the re­
placement wear ring in the suction head (3) and
use an arbor (or hydraulic) press to press it into the
suction head until fully seated.
Install the O‐ring (5) in the groove in the O.D. of the
suction head and lubricate it with light grease.
Position the suction head over the studs (6) and se­
cure with the hardware (1 and 2).
Discharge Check Valve Reassembly And
Installation
(Figure 4)
If the discharge check valve (1) was disassembled
to replace the flapper or cover O‐ring, position the
flapper in the valve body and check to ensure free
movement.
Install the valve cover O‐ring and secure the cover
to the body with the previously removed hardware.
Apply a small amount of light grease to the dis­
charge flange gasket to hold it in place and posi­
tion it against the pump casing flange. Support the
discharge check valve assembly using a sling and
a suitable lifting device. Using the previously re­
moved hardware, secure the discharge check
valve assembly and flange gasket to the pump as­
sembly (2). Secure the discharge check valve to its