Gorman-Rupp Pumps PAH4A60-6068H 1511893 and up - Manual (Page 48)

OM-06441 PAH SERIES
MAINTENANCE & REPAIR PAGE E - 25
collars on the adjusting screws. Use the collars to
turn the adjusting screws clockwise until the holes
in the locking collars realign with the tapped screw
holes in the back cover plate. Secure the locking
collars to the back cover plate with the hardware
(15 and 16). Install the two remaining hand knobs
snugly against the adjusting screws.
Remove the first two back cover nuts from their
studs. Turn the adjusting screws clockwise until
they engage the pump casing. Install the locking
collars and hardware (15 and 16). Reinstall the
back cover nuts.
Be sure the wear ring does not scrape against the
impeller when the shaft is turned.
After the face clearance has been set, tighten the
hardware securing the rotating assembly to the
pump casing.
Discharge Check Valve Reassembly And
Installation
(Figure 4)
If the discharge check valve (12) 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). Secure the discharge check valve to its
support bracket using the previously removed
hardware.
Priming Chamber Assembly And Installation
(Figure 8)
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 7)
Install the baffle and gasket (8 and 9) and use a
sling and suitable lifting device to position the prim­
ing chamber assembly on the pump suction spool
(7, Figure 5). Secure the priming chamber assem­
bly with the hardware (6 and 7).
Reconnect both the suction piping and the air dis­
charge tubing to the priming chamber assembly.
LUBRICATION
Seal Assembly
(Figure 6)
Before starting the pump, remove the vented plug
(13) and fill the seal cavity with approximately 170
ounces (5 liters) of SAE No. 30 non‐detergent oil to
the center of the sight gauge (10A). Clean and rein­
stall the vented plug. Check the oil level regularly
and maintain it at the middle of the sight gauge.
Bearings
(Figure 6)
The bearing housing was fully lubricated when
shipped from the factory. Check the oil level regu­
larly through the sight gauge (10)
and maintain it at
the midpoint of the gauge. When lubrication is re­
quired, remove the air vent (13A) and add SAE No.
30 non‐detergent oil through the opening. When
lubricating a dry (overhauled) intermediate, fill the