Pump should only be serviced by qualified person-
nel.
Be sure to prime pump (Page 6) before starting up
after service.
Before removing or trap cover:
1. STOP PUMP before proceeding.
2. CLOSE GATE VALVES in suction and discharge
pipes.
3. RELEASE ALL PRESSURE from pump and piping
system.
To avoid dangerous or
fatal electrical shock
hazard, turn OFF power to
motor before working on
pump or motor!
Aside from lubricating trap
cover O-Ring, no lubrication or
regular maintenance is needed
beyond reasonable care and
periodic cleaning of the trap
basket.
If shaft seal is worn or damaged, repair as follows:
Pump disassembly/Removing Old Seal:
Disconnect power supply to motor.
1.
Disconnect electrical wire at motor. Close any gate
valves in the suction and discharge piping. Drain
pump. Remove pump hold down bolts. Disconnect
pipe unions or clamps adjacent to pump. Withdraw
complete pump/motor assembly.
2.
Remove six screws (Key No. 3, Page 10) and withdraw
tank body (Key No. 19, Page 10). Remove tank body
O-Ring (Key No. 5, Page 10).
3.
Loosen two screws and remove motor canopy. If
motor has a capacitor, partially unscrew clamp and
move capacitor to one side.
Risk of electrical shock.
Do not touch
capacitor terminals with body or any metal object.
4.
Hold motor shaft with a 7/16” wrench on the shaft
flats. Turn impeller (Key No. 8, Page 10) counter-
clockwise when facing it and unscrew the impeller.
Remove spring portion of seal (Key No. 6, Page 10)
from impeller sleeve. Remove diffuser (Key No. 7, Page
10).
5.
Unscrew four motor throughbolts. Remove seal plate
(Key No. 4, Page 10). Remove stationary components
of seal (Key No. 6, Page 10) from seal plate.
Pump Reassembly/Installing New Seal:
1.
Carefully examine the seal “L” cup and tank body
O-Ring (Key No. 5, Page 10). Replace if material shows
any sign of damage or deterioration.
2. Check the mechanical seal (Key No. 6, Page 10) for
scoring on the contact surfaces and also for any dam-
age to the spring or retainer. Replace seal if necessary.
3. Press the stationary components of the seal (“L” cup
and ceramic seat) into the seal plate (Key No. 4, Page
10) using finger pressure only. Make sure components
are firmly and evenly seated.
4. Align the tab on the diffuser with the groove in the seal
plate (Key No. 4, Page 10) and install the diffuser (Key
No. 7, Page 10).
5.
Slide the spring portion of the seal (Key No. 6, Page
10) over the sleeve of the impeller (Key No. 8, Page 10)
until it butts against the impeller shroud. (Make sure
the carbon surface faces the ceramic surface).
6. Insert the impeller sleeve through the opening in the
seal plate (Key No. 4, Page 10).
7. Install the slinger (Key No. 2, Page 10) on the end of
the impeller sleeve.
8.
Steps (3) through (7) result in subassembly of seal
plate, diffuser, impeller, seal and slinger (Key Nos. 4, 7,
8, 6, and 2 respectively, Page 10). Attach the sub-
assembly to the motor as follows:
i.
Fit impeller sleeve over motor shaft.
ii.
Align motor throughbolts with mounting holes in
seal plate (Key No. 4, Page 10).
iii. Hold motor shaft with a 7/16” wrench on the shaft
flats and screw on impeller (Key No. 8, Page 10).
iv. Move capacitor back into position and tighten ca-
pacitor clamp.
v.
Secure the four motor throughbolts making sure
that the seal plate (Key No. 4, Page 10) butts firmly
against the motor endbell.
vi. Replace motor canopy and tighten two screws.
9.
Install the tank body O-Ring (Key No. 5, Page 10) in the
recess in the seal plate (Key No. 4, Page 10).
10. Fit the tank body (Key No. 19, Page 10). Install and
tighten six capscrews (Key No. 3, Page 10).
11. Re-install pump. Re-connect union couplings and elec-
trical wiring.
8
PUMP SERVICE
WARNING
Hazardous voltage. Can
shock, burn, or cause
death.
Disconnect power before
working on pump or motor.
Summary of Contents for CRAFTSMAN 390.262801
Page 11: ...11...
