Gorman-Rupp Pumps PA6F60-4045T 1521221 and up - Manual (Page 36)

PA SERIES OM-06189
MAINTENANCE & REPAIR PAGE E - 14
ing 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 hopper spool (6, Figure
3).
(Figure 7)
Remove the hardware (2 and 3) securing the prim­
ing valve (1) to the priming chamber lid (7). Careful­
ly 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 (10)
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 lockwasher securing the
orifice button to the linkage bar and unscrew the
orifice button from the linkage bar.
If replacement is required, remove the hardware (5
and 6) securing the priming chamber lid. Remove
all of the old adhesive and replace the linear O‐ring
(8).
Discharge Check Valve Removal and
Disassembly
(Figure 3)
Remove the discharge piping. Support the dis­
charge check valve assembly (11) using a sling
and a suitable lifting device. Remove the attaching
hardware (not shown) and separate the discharge
check valve assembly and gasket from the pump
assembly (1).
The flapper and gasket are the only serviceable
parts of the check valve. If the flapper requires re­
placement, remove the hardware securing the
cover and gasket. Separate the valve cover and re­
move the flapper.
Pump Casing And Wear Ring Removal
(Figure 4)
Before attempting to remove the pump casing, re­
move the lower most pipe plug (4) and drain any
liquid from the pump casing. Clean and reinstall
the pipe plug.
See Figure 3, disengage the hardware (4 and 5)
and remove the hopper spool (6) and gasket (2)
from the pump casing.
If the impeller (2) is to be removed, it is recom­
mended that the impeller lock screw (50) be loos­
ened before removing the pump casing (1). With
the discharge check valve removed, insert a piece
of wood through the discharge port to block impel­
ler rotation. If the discharge check valve has not
been removed, disengage the hardware (47) and
remove the cleanout cover and gasket (45 and 46).
Insert the wood block to immobilize the impeller
through the cleanout cover opening.
The impeller lock screw is secured with “Loctite
Threadlocker No. 262”. To remove the screw, apply
heat directly to the head of the screw. While the
lock screw is hot, use an allen head socket and a
breaker bar to apply steady, even torque to break
the lock screw loose. Apply additional heat as re­
quired.
NOTE
When loosening the impeller lock screw, use a
breaker bar with an extension, if necessary, but do
not use an impact wrench. Make sure the allen
head tooling is in excellent condition to avoid strip­
ping or damage to the screw.
After the impeller lock screw breaks loose, remove
the wood block. If removed, reinstall the cleanout
cover and gasket, and secure with the previously
removed hardware before continuing with pump
casing removal.
Support the pump casing (1) using a suitable hoist
and sling. Disengage the hardware (42, 43 and
44). Reinstall two of the capscrews in the tapped
holes in the back plate (6) and tighten the screws in
an alternating pattern to jack the pump casing free