Gorman-Rupp Pumps 13A2-B 710664 and up - Manual (Page 28)

OM-00621 10 SERIES
MAINTENANCE & REPAIR PAGE E - 5
Back Cover Removal
The wear plate assembly (32) is easily accessible
and may be serviced by removing the back cover
assembly (40). Loosen the clamp bar screw (46)
and remove the clamp bar (45). Pull the back cover
and wear plate from the pump casing. Remove the
back cover gasket (39). Clean the mating surfaces
of the back cover plate and pump casing.
Inspect the wear plate and replace it if badly scored
or worn. To remove the wear plate, disengage the
hardware (36 and 37) securing it to the back cover.
If no further disassembly is required, see Back
Cover Installation.
Pump Casing Removal
To service the impeller (2) or seal assembly (3), dis­
connect the discharge piping. Remove the hard­
ware securing the pump casing (1) to the base. Tie
and tag any leveling shims used under the casing
mounting feet to ease reassembly.
Remove the nuts (30) securing the pump casing
and gasket set (31) to the pedestal (15) and seal
plate (9). Separate the casing from the seal plate
and pedestal.
Remove the gasket set (31) from the pedestal and
seal plate. Tie and tag the gaskets, or measure and
record their thickness for ease of reassembly.
Impeller Removal
Before removing the impeller, turn the cross arm on
the automatic grease cup (8) clockwise until it rest
against the cover (see Figure 4). This will prevent
the grease from escaping when the impeller is re­
moved.
Disconnect the power source.
Immobilize the impeller by wedging a block wood
between the vanes. If removed, install the shaft
key (21). Install a lathe dog on the drive end of the
shaft (22) with the “V” notch positioned over the
shaft keyway.
With the impeller rotation still blocked, strike the
lathe dog sharply in a counterclockwise direction
(when facing the drive end of the shaft). The impel­
ler may also be loosened by using a long piece of
heavy bar stock to pry against the arm of the lathe
dog in a counterclockwise direction (when facing
the drive end of the shaft) as shown in Figure 2.
Use caution not to damage the shaft or keyway.
When the impeller breaks loose, remove the lathe
dog and wood block and unscrew the impeller
from the shaft.
Turn
Counterclockwise
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 2. Loosening Impeller
Unscrew the impeller from the shaft. Use caution
when removing the impeller; tension on the seal
spring will be released as the impeller is un­
screwed.
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (32)
off the impeller shaft. Tie and tag the shims, or
measure and record their thickness for ease of
reassembly.
Seal Removal and Disassembly
(Figures 1 and 3)
Remove the grease cup and piping (6, 7 and 8)
from the seal plate. Slide the seal plate and seal as­
sembly off the shaft as a unit. Carefully remove the
rotating and stationary seal elements, packing
rings, stationary washers, seal spring and shaft
sleeve from the seal plate.
Inspect the seal liner (10) for wear or grooves
which could cause leakage or damage to the seal
packing rings. The seal liner is a press fit in the seal
plate and does not normally require replacement.