Gorman-Rupp Pumps PAH8A60C-B 1537579 and up - Manual (Page 34)

PAH SERIES OM-06455
MAINTENANCE & REPAIR PAGE E - 12
necessary and keep personnel away
from suspended objects.
Use only replacement parts provided or
approved by Gorman‐Rupp. Use of non‐
authorized parts may result in damage to
the equipment and/or injury to personnel
and will invalidate the warranty.
Priming Chamber Removal And Disassembly
(Figure 4)
Disconnect both the suction piping and the air dis­
charge tubing from the priming chamber assembly
(1). Support the priming chamber assembly using
a sling and a suitable lifting device. Remove the
hardware (6 and 7) and separate the priming
chamber assembly, gasket (8) and baffle (9) from
the pump assembly.
(Figure 5)
Remove the hardware (2 and 3) securing the prim­
ing valve (1) to the priming chamber (5). Carefully
lift the valve components from the priming cham­
ber. Remove the gasket (4) and clean the mating
surfaces.
If the priming valve float is stuck or the strainer (6) is
clogged, it can usually be cleaned without further
disassembly.
The only serviceable part of the priming valve is the
orifice button (not shown). If liquid continues to by­
pass through the priming chamber after adjusting
the orifice button (see Priming Chamber Reas­
sembly and Installation for adjustment), the but­
ton may require replacement. To replace the orifice
button, remove one of the “e‐clips” from the pivot
pin closest to the orifice button and remove the piv­
ot pin. This will allow the linkage to be raised high
enough to access the orifice button.
Remove the hex nut and lock washer securing the
orifice button to the linkage bar and unscrew the
orifice button from the linkage bar.
Discharge Check Valve Removal and
Disassembly
(Figure 1)
Support the discharge check valve assembly (16)
using a sling and a suitable lifting device. Remove
the hardware (not shown) and separate the dis­
charge check valve assembly and gasket (not
shown) from the pump assembly (1).
The flapper and cover O‐ring are the only service­
able parts of the check valve. If the flapper requires
replacement, remove the hardware securing the
cover. Separate the cover and O‐ring and remove
the flapper.
Suction Head and Wear Ring Removal
(Figure 2)
The wear ring (10) is easily accessible and may be
serviced by removing the suction head (2). Before
attempting to service the pump, remove the lower­
most pipe plug (5) from the pump casing drain the
pump. Clean and reinstall the drain plug.
It is not necessary to remove the suction spool (11,
Figure 1) from the suction head unless replace­
ment of the spool, gasket (8, Figure 1) or suction
head is required. To remove the suction head, re­
move the back cover nuts (15) and two diagonally
opposing locking collars (13). Use the adjusting
screws (12) to press the suction head out of the
pump casing.
Remove and discard the O‐ring (3).
Inspect the wear ring and, if replacement is re­
quired, install two 5/8-11 UNC‐2B capscrews (not
supplied) in the tapped holes in the suction head
and use the screws to press the wear ring out of the
suction head.
Pump Casing Removal
(Figure 2)
If the impeller (1, Figure 3) is to be removed, the im­
peller screw (2, Figure 3) must be removed before
removing the pump casing (1). With the discharge
check valve removed, insert a soft metal bar or rod
through the discharge port to block impeller rota­
tion.
Use an impact wrench with a hex key to loosen the
impeller capscrew, then remove the capscrew,