Maintenance 7
In stallation of Rotating Part of Seal
Unit
(Figure 5D)
1. Reinstall seal plate using extreme caution not to hit
ceramic portion of seal on motor shaft.
2. Inspect shaft to make sure that it is clean.
3. Clean face of sealing washer with clean cloth.
4. Lubricate inside diameter and outer face of rubber
drive ring with soapy water and slide assembly on
motor shaft (sealing face first) until rubber drive ring
hits shaft shoulder.
5. Screw impeller on shaft until impeller hub hits shaft
shoulder. This will automatically locate seal in place
and move the sealing washer face up against seat
facing. Reinstall impeller screw (if used).
5939 0412
Figure 5
A - Seal removal - rotating half
Mechanical seal
stationary half
Polished surface
Shaft shoulder
D - Seal installation - rotating half
Seal plate
3/4” socket or pipe
Rubber
drive ring
C - Seal installation - stationary half
Turn over
Cardboard washer
(supplied with seal)
Sealing
face
Mechanical seal
rotating half
Rubber surface
Impeller
B - Seal removal - stationary half
Risk of electric shock. Can shock, burn or kill. To guard against accidental personal injury, the electric
power to the pump should be turned off when conducting the checking procedures outlined. There are obvious
exceptions, however, and service personnel should take necessary safeguards against the hazard of electrical shock.
Problem
Probable Cause(s)
Remedy
Pump fails to pump.
Pump not properly primed.
Make sure pump casing and suction line are
full of water. See priming instructions.
Pump has reduced
capacity and/or head.
Air pockets or leaks in suction line.
Check suction piping.
Clogged impeller.
Remove and clean.
Pump loses prime.
Air leaks in suction line.
Check suction piping.
Excessive suction lift and operating too near
shut-off point.
Move pump nearer to water level.
Water level drops while pumping,
uncovering suction piping.
Check water supply. Add length of pipe to
suction to keep submerged end under water.
Mechanical troubles
and noise.
Bent shaft and/or damaged bearings.
Take motor to authorized motor repair shop.
Suction and/or discharge piping not properly
supported and anchored.
See that all piping is supported to relieve
strain on pump assembly.
Troubleshooting
