Gorman-Rupp Pumps PA6F60-4045T 1521221 and up - Manual (Page 37)

OM-06189 PA SERIES
MAINTENANCE & REPAIR PAGE E - 15
from the back plate. Use caution to ensure that the
pump casing does not fall onto and damage the
imepller.
Inspect the wear ring (49) for excessive wear or
scoring. The wear ring is a press fit into the pump
casing. If replacement is required, use a small bit to
drill three holes horizontally, 120
_ apart, through
the wear ring. Use a chisel or other suitable tool to
complete the cuts through the wear ring. Use cau­
tion not to damage the pump casing bore. Remove
the wear ring sections from the pump casing.
If no further disassembly is required, see Pump
Casing and Wear Ring Installation.
Impeller Removal
(Figure 4)
Before attempting to remove the impeller, remove
the pipe plug from the seal oil reservoir (3) and
drain the seal lubricant into a clean container. In­
spect the oil for water, dirt, or cloudy condition
which could indicate seal failure.
With the reservoir drained, disconnect the hoses
(39) from the back plate (6) and drain any residual
lubricant from the hoses and back plate. This will
prevent the oil from escaping when the impeller is
removed.
NOTE
When removing the impeller as described below,
use extreme caution not to damage the impeller,
shaft or bearings.
Remove the impeller lock nut and washer (50 and
51). Install two wedges, 180
_ apart, along the im­
peller vanes between the impeller and back plate.
Use a pair of hammers to tap both wedges at the
same time to force the impeller off the shaft. Retain
the impeller key (48).
Seal Removal
(Figures 4 And 8)
Remove the impeller shims (52). Tie and tag the
shims for ease of reassembly. Remove the seal
spring.
Slide the rotating portion of the seal (consisting of
the shaft sleeve and O‐ring, bellows and retainer,
and rotating element) off the shaft as a unit.
Apply oil to the sleeve and work it up under the rub­
ber bellows. Slide the bellows and retainer off the
sleeve. Remove the sleeve O‐ring.
It is recommended that the lip seal (7) and V‐ring
(8) be replaced whenever the mechanical seal is
replaced. Remove the hardware (40 and 41) and
slide the back plate (6), lip seal (6) and stationary
seal seat off the shaft as a unit.
Press the seal stationary element out of the back
plate from the back side. Pry the oil seal (7) out of
the back plate.
Remove the V‐ring (8).
If no further disassembly is required, refer to Seal
Installation.
Separating Pump Frame And Drive Assembly
From Engine
(Figure 5)
Further disassembly requires separating the pump
frame and drive assembly from the engine. Sup­
port the pump frame (13, Figure 4) using a suitable
hoist and sling.
Disengage the hardware (6 and 7) securing the en­
gine bracket (25, Figure 4) to the engine bellhous­
ing. Separate the pump frame and drive assembly
from the engine by pulling the pump frame straight
away from the engine.
As the assemblies separate, the flexible portion of
the coupling assembly (3) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
two allen head setscrews from the bushing (2).
Screw one of the setscrews into the puller hole on
the circumference of the bushing. As the coupling
and bushing separate, remove the bushing, and
slide the coupling off the shaft. Remove the shaft
key (20, Figure 4).
It is not necessary to remove the outer ring of the
coupling from the engine flywheel unless the cou­
pling must be replaced. To remove the ring, disen­
gage the hardware (4 and 5) securing it to the fly­
wheel.