WTR2-640
Chapter 5: Maintenance
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Maintaining the Pump
Disassembling the Pump
Before opening the pump chamber:
•
Make sure that any pressure in the chamber has been completely vented!
•
Make sure that the motor cannot be inadvertently started while you work on the pump!
Failure to follow these precautions may result in serious injury or death!
1. Mark the head and casing before disassembly to insure proper reassembly. The
idler pin, which is offset in the pump head, must be positioned toward and equal
distance between port connections to allow for proper flow of liquid through the
pump.
2. Remove the head from the pump. Do not allow the idler to fall from the idler pin.
To prevent this from happening, tilt the top of the head back when removing.
Avoid damaging the head gasket.
3. Remove the idler and the bushing assembly.
4. Insert a length of hardwood or brass through the port opening between the rotor
teeth to keep the shaft from turning. Bend up the lockwasher tang with a spanner
wrench. Remove the locknut and lockwasher from the shaft.
5. Loosen Allen head setscrews in the face of the thrust bearing assembly. Remove
the thrust bearing assembly by threading out of the bracket.
6. Loosen the radial setscrews in the thrust bearing assembly and remove the end
cap using the spanner wrench.
7. Remove the bearing spacer collars and the ball bearing.
8. Using snap ring pliers, remove snap ring from shaft.
9. Remove two nuts holding seal gland plate and seal gland in place. Slide seal
gland off of the shaft being careful not to damage the lip seal.
10. Using a soft headed hammer, gently tap on the end of the rotor shaft until the rotor
and shaft assembly can be completely removed from the pump. Note the
mechanical seal may stick to the shaft causing initial resistance when the shaft is
removed.
11. Remove the mechanical seal parts from the bracket.
12. Clean all parts thoroughly and examine for wear and damage. Check lip seals,
ball bearing, bushings and idler pin and replace if necessary. Check all other
parts for nicks, burrs, excessive wear and replace if necessary.
13. Wash bearings in clean solvent. Blow out bearings with compressed air. Do not
allow bearings to spin; turn them slowly by hand. Spinning bearings will damage
race and balls. Make sure bearings are clean, then lubricate with non-detergent SAE
30 weight oil and check for roughness. Roughness can be determined by turning
outer race by hand.
14. Casing can be checked for wear or damage while mounted on bracket.
