OM−01155
0 SERIES
MAINTENANCE & REPAIR
PAGE E − 7
Impeller Removal
(Figure 1)
The impeller (2), wear ring (5) and seal assembly
(3) may serviced by removing the cover plate (16).
To remove the cover plate, disengage the nuts (12)
securing the cover plate to the pump casing (1).
Remove the cover plate gasket (17).
To remove the impeller, see Figure 2 and remove
one of the pipe plugs (4) located in the gearbox.
Screw the threaded sleeve on the gear jam tool
(P/N 48781−002, Figure 3) into the pipe plug hole.
Slide the pin through the sleeve until the beveled
end of the pin engages the teeth of the drive gear
(25). Screw the adjustment nut onto the sleeve un-
til the pin firmly engages the teeth of the drive gear
and jams rotation. Check to ensure that the pinion
shaft (1) will not turn.
ADJUSTMENT NUT
THREADED SLEEVE
PIN
Figure 3. 48781−002 Gear Jam Tool
NOTE
If the gear jam tool does not prevent shaft rotation,
the drive gear or key may be damaged. If so, the
shaft and pump end must be disassembled to un-
screw the impeller.
See Figure 2 and remove the drive shaft key (16)
and slinger ring (15) from the drive shaft (17). Re-
move the lower most drain plug (24) and drain the
gearbox lubricant. Clean and reinstall the drain
plug. Disengage the hardware (10 and 11) and re-
move the bearing cover (13), oil seal (18), and gas-
ket (6) from the gearbox housing (5).
See Figure 1 and remove the hardware (7 and 8) se-
curing the pump casing (1) to the gearbox. Use a
1−inch diameter brass rod (or wooden dowel) and
a hammer to tap the shaft and assembled pump
parts from the gearbox.
Be careful
not to damage
the outboard pinion shaft bearing (12, Figure 2)
while driving the shaft out. Once the assemblies
have been separated, secure the shaft gear teeth in
a
soft-jawed
vice and proceed with the impeller re-
moval.
An impeller wrench (P/N 8516) or a 1−inch square
steel bar may be used to remove the impeller. In-
sert the tool completely into the square recess pro-
vided in the impeller hub, and turn the impeller in a
counterclockwise direction (when facing the im-
peller). Use caution when removing the impeller;
tension on the seal spring will be released as the
impeller is removed. If used, leave the gear jam tool
in place after removing the impeller.
NOTE
If the steel insert inside the impeller has stripped
loose, drill two 3/16−inch (5 mm) diameter by 7/16
inch (12 mm) deep holes 180
_
apart into the impel-
ler and steel insert.
Be sure
not to damage the shaft
threads. Install two pins in the drilled holes to se-
cure the impeller to the insert.
The pins are used for impeller removal
only
. If the insert has stripped loose from
the impeller,
replace the impeller
.
Do not
reinstall an impeller with the insert secured
by pins.
After removing the impeller, inspect the seal guard
(13) for excessive wear or scoring. The seal guard
is secured to the impeller by a press fit. If replace-
ment is required, apply heat before pulling it off the
impeller.
Seal Removal and Disassembly
(Figure 1)
Carefully remove the seal spring. Apply oil to the
shaft and work it up under the bellows. Remove the
rotating portion of the seal from the shaft.
Use a pair of stiff wires with hooked ends to remove
the stationary seat and O-ring from the pump cas-
ing.
