Gorman-Rupp Pumps PAH3A60C-B 1524589 and up - Manual (Page 33)

PAH SERIES OM-06472
MAINTENANCE & REPAIR PAGE E - 12
(Figure 6)
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)
Remove the hardware (not shown) securing the
discharge check valve bracket to the base.
Support the discharge check valve assembly (23)
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 (4) is easily accessible and may be
serviced by removing the suction head (3). Before
attempting to service the pump, remove the lower­
most pipe plug (8) from the pump casing (7) and
drain the pump. Clean and reinstall the drain plug.
It is not necessary to remove the suction spool (18,
Figure 1) from the suction head unless replace­
ment of the spool, gasket (14, Figure 1) or suction
head is required. To remove the suction spool, dis­
engage the hardware (16 and 17, Figure 1) secur­
ing it to the pump casing.
Remove the hardware (1 and 2) and securing the
suction head to the pump casing. Install two
5/8-11 UNC‐2B capscrews (not supplied) in the
tapped holes in the suction head and use the caps­
crews to press the suction head out of the pump
casing. Remove the capscrews from the suction
head.
Remove and discard the O‐ring (5).
Inspect the wear ring and, if replacement is re­
quired, install two 3/4-10 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. Remove the capscrews from the
suction head.
Pump Casing Removal
(Figure 2)
Remove the uppermost pipe plug (8) from the
pump casing and install a lifting eye in the hole. Be
sure to screw the lifting eye tightly into the hole as
far as it will go. Attach a sling and suitable lifting de­
vice to the lifting eye and support the pump casing.
Remove the hardware (1A and 2A) and use the lift­
ing device to pull the pump casing straight away
from the rotating assembly (10).
Remove and discard the pump casing O‐ring (5A).
Draining Oil From Seal Cavity
(Figure 3)
If any further disassembly is to be performed on the
pump, the seal oil cavity must be drained to pre­
vent the oil in the seal cavity from escaping as the
pump casing is removed.
Position a clean container under the seal cavity
drain plug (15B). Remove the plug and drain the oil
from the seal cavity into the container. For shorter