Gorman-Rupp Pumps 13A65-B 776101 and up - Manual (Page 28)

OM-02146 10 SERIES
MAINTENANCE & REPAIR PAGE E - 5
Inspect the check valve parts for wear or damage.
If replacement is required, remove the hardware
(62 and 63) and separate the check valve gasket
(60) and weights (59 and 61).
If no further disassembly is required, see Suction
Check Valve Installation.
Back Cover Removal
The wear plate assembly (42) is easily accessible
and may be serviced by removing the back cover
assembly (47). Loosen the clamp bar screw (52)
and remove the clamp bar (53). Pull the back cover
and wear plate from the pump casing. Remove the
back cover gasket (46). 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 (43 and 44) securing it to the back cover.
If no further disassembly is required, see Back
Cover Installation.
Pump Casing Removal
To service the impeller or seal assembly, discon­
nect the discharge piping. Remove the hardware
securing the pump to the base. Disconnect the
power source. Tie and tag any leveling shims used
under the pump mounting feet to ease reassembly.
Remove the nuts (36) and separate the pump cas­
ing and gasket set (39) from the seal plate (14) and
pedestal (20). Clean the mating surfaces of the
seal plate and pump casing. Tie and tag the gas­
kets, or measure and record their thickness for
ease of reassembly.
Impeller Removal
Immobilize the impeller by wedging a block of
wood between the vanes. If removed, install the
shaft key (27). Install a lathe dog on the drive end of
the shaft (28) 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 in a counterclockwise direction.
Turn
Counterclockwise
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 2. Loosening Impeller
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (12)
off the impeller shaft. Tie and tag the shims or mea­
sure and record their thickness for ease of reas­
sembly.
Seal Removal and Disassembly
Slide the shaft sleeve (15) and rotating portion of
the seal off the shaft as a single unit. Measure and
record the distance from the impeller end of the
sleeve to the end of the seal retainer, or use a felt‐tip
marker to scribe a line on the sleeve at this location.
Loosen the setscrews securing the retainer to the
sleeve and slide the rotating portion of the seal off
the sleeve.
Slide the seal plate and stationary seal compo­
nents off the shaft as a single unit. Place the seal
plate on a flat surface with the impeller side down.
Remove the nuts (38) and separate the seal clamp
(34) and stationary portion of the seal from the seal
plate.
If no further disassembly is required, see Seal
Reassembly and Installation.