Gorman-Rupp Pumps PAH4B60-QSB4.5P 1526774 and up - Manual (Page 40)

PAH SERIES OM-06609
MAINTENANCE & REPAIR PAGE E - 18
to prevent injuries to personnel or dam­
age to equipment. If slings or chains are
used to move the pump or components,
make sure that the load is balanced;
otherwise serious personal injury or
death could result. Suction and dis­
charge hoses and piping must be re­
moved from the pump before lifting.
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 7)
Disconnect both the suction piping and the air dis­
charge tubing from the priming chamber assembly
(4, Figure 4). Support the priming chamber assem­
bly using a sling and a suitable lifting device. Re­
move the hardware (6 and 7) and separate the
priming chamber assembly, gasket (8) and baffle
(9) from the spool (7, Figure 4).
(Figure 8)
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 4)
Remove the hardware (not shown) securing the
discharge check valve bracket to the base.
Support the discharge check valve assembly (12)
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 5)
The wear ring (3) 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 (6) from the pump casing drain the
pump. Clean and reinstall the drain plug.
It is not necessary to remove the suction spool (7,
Figure 4) from the suction head unless replace­
ment of the spool, gasket (3, Figure 4) or suction
head is required. To remove the suction head, dis­
engage the hardware (5 and 6) securing it to the
pump casing.
Remove the back cover nuts (14) and two diago­
nally opposing locking collars (13). Use the adjust­
ing screws (12) to press the suction head out of the
pump casing.
Remove and discard the O‐ring (4).
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.