Electrical Tests; Pump / Motor Separation; Pump Disassembly - Pentair BERKELEY TMH Series Owner's/Operator's Manual

ELECTRICAL TESTS

The following electrical checks can be made with
pump installed.
Risk of high voltage electrical shock when
testing. Can stun, burn, or kill. Only qualified
electricians should perform these tests. When testing,
use all normal precautions for the voltages involved.
Circuit (Winding) Resistance Test (Figure 4)
Incoming
Power
Ohmmeter
Set at Rx1 or
Voltmeter
Set on LO
Ohms
Figure 4: Circuit (Winding) Resistance Test
1. Shut off main power supply and disconnect motor wires.
2. Attach two ohmmeter leads to pairs of cable wires in
turn (black and red wires on three wire single phase
units). Compare readings with data provided in motor
manual.
3. If reading is considerably higher than chart, an open
circuit (broken wire) is indicated; if reading is con-
siderably lower, a short circuit is indicated. In either
case, remove pump from well and repair unit.
NOTICE: Be sure to include cable and winding resistance.
Multiply cable length by the per-foot cable resistance (see
Table 4, Page 2) and add winding resistance from motor
chart to get total.
Ground Check (Figure 5)
Incoming
Power
Ohmmeter
Set at Rx100K
or Voltmeter
Set on H1
Ohms
Figure 5: Ground Check
1. Shut off main power supply and disconnect motor wires.
2. Attach one ohmmeter lead to pipe or METAL well
casing and the other lead, in turn, to each individual
motor wire.
3. If resistance reading goes to zero after touching any
of the wires, the pump should be raised to determine
location of ground fault (cable, motor, or splice).
Controller
G
L3
L2
L1
Ground
To Pump
7071 0616
Controller
G
L3
L2
L1
Ground
To Pump
7072 0616
4. Raise pump, watching resistance reading. When re sis-
tance goes to infinity, fault has come out of the water.
If ground fault is located in cable or splice, repair it.
5. If ground fault appears to be located in motor, remove
pump from well. Cut cable at motor side of splice and
determine whether or not motor is grounded. If motor
indicates complete ground (resistance reading goes to
zero) replace unit.
If motor is not grounded, re-check splice and cable.

PUMP / MOTOR SEPARATION

Refer to Repair Parts, Page 10 .
NOTICE:
Removing Pump From Motor
1. Remove the cable guard from the pump; cut the cable
off of the motor leads just above the splice.
2. Remove the nuts (4" motors) or bolts (6" motors)
holding the pump to the motor. Using suitable lifting
apparatus, hoist pump off of motor.
3. If you are returning the motor to the factory, cut motor
lead above cable splice, leaving motor lead installed
in motor. Don't work on the motor before returning it.
To prevent damage in transit, crate the motor as it was
when shipped new.

Pump Disassembly

1. Remove the suction screen.
2. Remove coupling from shaft.
3. Fasten pump in chain vise.
4. Remove the discharge.
5. Remove the last stage bowl. Bowls are held together
with thread-locking compound. You may need to heat
the bowls to loosen the threads.
NOTE: Threads are left hand.
Risk of burns. Use proper safety
equipment when handling hot bowls.
6. Bolt the fixture to the pump suction bracket. Add 3/16"
spacer between shaft and fixture to lift shaft assembly
and aid in impeller removal.
7. Slip the collet driver, large end first, over the shaft and
tap on the impeller to loosen the collet. Do not use a
pipe wrench or any other tool that could damage or
scar the impeller or the pump shaft.
8. Remove the impeller and the collet. Mark the impeller
and the bowl as they come off so that they can be
reassembled as a pair.
9. Repeat steps 5, 7 and 8 for all stages.
10. Clean each part. Dress down any burrs raised during
disassembly. Make sure all flanges and mating fits are
free of burrs, rust, and dirt.
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