Gorman-Rupp Pumps 04A20-B 818101 and up - Manual (Page 25)

OM-01206 0 SERIES
MAINTENANCE & REPAIR PAGE E - 5
separate the pump casing and gasket (42) from
the seal plate and pedestal.
Tie and tag any leveling shims used under the cas­
ing feet to ease reassembly.
Inspect the wear ring (48) for excessive wear or
scoring. The wear ring is secured in the pump cas­
ing by a press fit. If replacement is required, use a
small bit to drill two holes through the ring horizon­
tally, 180
_ apart. Use a saw or chisel to complete
the cuts through the ring, and remove it from the
pump casing. Use caution not to damage the
pump casing bore when removing the wear ring.
Use caution not to damage the pump cas­
ing bore when removing the wear ring.
Impeller Removal
Before attempting to remove the impeller, remove
the bottle oiler and piping (13, 14, 15 and 16) to
prevent the seal lubricant from escaping when the
impeller is removed.
Immobilize the impeller by inserting a bar between
the impeller vanes, being careful not to damage
the vanes. Disengage the hardware (51, 52 and
53). Remove the bar from the impeller.
Install 3/8-16 UNC by 4‐inch long capscrews in
the tapped holes in the impeller. Use the caps­
crews and a suitable puller to remove the impeller
from the shaft. Use caution when removing the im­
peller; tension on the seal spring will be released as
the impeller is removed. Retain the impeller key (9).
Remove the impeller adjusting shims (59). Tie and
tag the shims or measure and record their thick­
ness for ease of reassembly.
Seal Removal and Disassembly
(Figures 1 and 2)
Remove the spring retainer, spring washer (60)
and seal spring. Lubricate the seal area of the shaft
and work oil up under the bellows. Slide the rotat­
ing portion of the seal off the shaft as a unit.
Use caution not to damage the seal plate
bore when removing the wear ring.
Remove the machine screws (54) and slide the
seal plate and stationary portion of the seal off the
impeller shaft (26) as a unit. Press the stationary
seal element and O‐ring out of the seal plate from
the back side.
Pry or press the oil seal (61) out of the seal plate.
Shaft And Bearing Removal And Disassembly
When the pump is properly operated and main­
tained, the pedestal should not require disassem­
bly. 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.
Remove the pedestal drain plug (35) and drain the
lubricant. Clean and reinstall the drain plug.
Remove the slinger ring (39). Disengage the hard­
ware (18 and 19) and slide the assembled bearing
cap (38) and oil seal (20) off the shaft. Remove the
O‐ring (37). Press the oil seal from the bearing cap.
Use snap ring pliers to remove the bearing retain­
ing ring (30) from the pedestal bore. Remove the
bearing shim set (29); tie and tag the shims, or
measure and record their thickness for ease of
reassembly.
Loosen, but do not remove, the machine screws
(27). Pry the retainer from the pedestal bore using
a pair of screwdrivers against the heads of the ma­
chine screws. After removing the retainer, tighten
the machines screws in the retainer.
Press the oil seal (24) from the bearing retainer,
and remove the O‐ring (31) from the pedestal bore.
Place a block of wood against the drive end of the
shaft and tap the shaft and assembled bearings
(21 and 23) from the bearing housing.