GORMAN-RUPP PA4C60-4045H, Инструкция по установке, эксплуатации и обслуживанию

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OM−06078 PA SERIES
MAINTENANCE & REPAIR PAGE E − 15
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 metal bar or rod blocking impeller rotation. If re-
moved, 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 capscrews (40). Reinstall
two of the capscrews in the tapped holes in the
back plate (6) and tighten the screws in an alternat-
ing pattern to jack the pump casing free from the
back plate.
Use caution to ensure that the pump
casing does not fall onto and damage the imepller.
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 (37) 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
(34) from the back plate and drain any residual lu-
bricant 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 (48 and
49). 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 (46).
Seal Removal
(Figures 4 and 8)
Remove the seal spring. Remove the impeller
shims (52). Tie and tag the shims for ease of reas-
sembly.
Slide the rotating portion of the seal (consisting of
the shaft sleeve (51) and O-ring (7), bellows and re-
tainer, 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 (8), spring (9)
and V-ring (10) be replaced whenever the mechan-
ical seal is replaced. Remove the hardware (39)
and slide the back plate, lip seal and spring, 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 lip seal and spring
out of the back plate.
Remove the V-ring.
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 (16, Figure 4) using a suitable
hoist and sling.
Disengage the hardware (5 and 6) securing the en-
gine bracket (22, 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 (2) will remain on the shaft.