Gorman-Rupp Pumps 54J20-B 1410811 and up - Manual (Page 27)

OM-01342 50 SERIES
MAINTENANCE & REPAIR PAGE E - 5
Work Surface
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 2. Loosening Impeller
The impeller bore is designed to accept a 2 inch
(50,8 mm) square block of wood or steel bar to aid
in removal of the impeller. Use an impeller wrench if
one is available. Turn the impeller counterclock­
wise (when facing the impeller). When the impeller
breaks loose, remove it from the impeller shaft. Use
caution when removing the impeller; tension on
the seal spring will be released as the impeller is re­
moved. Remove the lathe dog and shaft key.
Slide the impeller adjusting shims (43) off the shaft.
Tie and tag the shims or measure and record their
thickness for ease of reassembly.
With the impeller removed, inspect the wear ring
(6) for excessive wear or damage. If replacement is
required, remove the hardware (4 and 5) and install
5/16-18 UNC x 2-1/2 inch long jacking screws
(not supplied) in the threaded holes in the wear
ring. Tighten the jacking screws evenly (to prevent
binding) until the wear ring separates from the
pump casing.
Seal Removal and Disassembly
(Figures 1 and 4)
Carefully remove the assembled spring centering
washer and seal guard. Remove the seal spring.
Apply oil to the shaft and work it up under the bel­
lows. Slide the rotating portion of the seal off the
shaft.
Use a pair of stiff wires with hooked ends to remove
the stationary subassembly (consisting of the sta­
tionary element, seat and O‐rings).
An alternate method of removing the stationary
subassembly is to remove the seal housing (7) and
stationary subassembly from the pump casing as a
single unit.
To remove the seal housing, disengage the hard­
ware (10 and 11) and install 3/8‐16 UNC jacking
screws (not supplied) in the threaded holes in the
seal housing. Tighten the jacking screws evenly to
prevent binding and separate the seal housing
from the pump casing.
Slide the seal housing and stationary portion of the
seal off the shaft (26) as a single unit. Lay the seal
housing on a flat surface with the impeller side
down and use a suitably sized dowel to press the
stationary subassembly from the seal housing.
Remove the seal housing gasket (35).
If no further disassembly is required, refer to Seal
Reassembly.
Shaft and Bearing Removal and Disassembly
When the pump is properly operated and main­
tained, the shaft and bearings should not require
disassembly. Disassemble the shaft and bearings
only when there is evidence of wear or damage.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly
equipped shop by qualified personnel.
If not removed, remove the power source and ped­
estal mounting hardware. Separate the pedestal
(16) from the power source and retain the shaft key
(25).
Remove the pedestal drain plug (30) and drain the
lubricant from the pedestal. Clean and reinstall the
drain plug.
Remove the nuts (32) and separate the pedestal
from the pump casing (1). Remove the casing gas­
ket (12).