Gorman-Rupp Pumps PAH4C60C-B 1503565 and up - Manual (Page 39)

PAH SERIES OM-06479
MAINTENANCE & REPAIR PAGE E - 18
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 2)
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 (9). 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 1. If the suction spool (18) was re­
moved, install a new gasket (14) and secure the
spool to the pump casing with the previously re­
moved hardware (16 and 17).
Suction Head and Wear Ring Installation
(Figure 2)
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 1)
If the discharge check valve (23) was disas­
sembled 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 (1).
Priming Chamber Assembly And Installation
(Figure 6)
Clean and inspect the components of the priming
valve (1). Inspect the linkage and ensure the orifice
button (not shown) squarely engages the valve
seat. Replace the orifice button if required (see
Priming Chamber Removal and Disassembly
for orifice button removal).
If the orifice button was removed, screw the new
orifice button into the linkage bar until fully seated.
Align the hole in the linkage bar with the holes in the
bracket and reinstall the pivot pin. Secure the pivot
pin with the previously removed “e‐clip”.
Adjust the orifice button seating as necessary by
screwing the orifice button into or out of the linkage
bar. Proper adjustment is achieved when the ori­
fice button fully seats against the orifice before the
linkage bar on the float bottoms against the
threads on the orifice button. When adjustment is
complete, install and tighten the lock washer and
hex nut securing the orifice button.
Install the strainer (6) and priming valve gasket (4).
Lower the float into the priming chamber (5) and
secure the priming valve with the previously re­
moved hardware (2 and 3).
(Figure 5)
Install the baffle (9) and gasket (8) and use a sling
and suitable lifting device to position the priming
chamber assembly on the hopper spool (18, Fig­
ure 1). Secure the priming chamber assembly with
the hardware (6 and 7).