Temptek G-500 Series, Instruction Manual

Page: 43 / 64

Temperature Control Unit : VTO Series with G500 Series Instrument
Page: 43
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
5.2 PUMP SEAL REPLACEMENT
A. Most units use a pump seal that is a carbon/ceramic shaft seal assembly including a
stationary member, rotating member and tension spring.
B. The life cycle of the pump seal is determined by hours of use, operating temperature and
water quality. Poor water quality is the primary reason for premature pump seal failure.
C. The operator should follow this procedure to replace the pump seal:
1. Disengage process operations and relieve all system pressure.
2. Disengage main power supply following all lock out tag out requirements. Verify
the display is off.
3. Remove the lift-off access panel and set aside (Figure 5.1B).
4. Drain machine by removing the pump casing drain plug.
5. Remove the three motor wire leads from the motor wiring terminals. The operator
should “map” the wire terminal locations to ensure correct rewiring. The power
cord should be removed from the motor housing.
6. Locate and remove the 4 pump casing bolts. These bolts secure the motor and
motor adapter to the pump casing.
7. Separate the motor and adapter from the pump casing to expose the pump
impeller. Remove the motor and adapter from the unit and place on a workbench
to continue the procedure.
8. Locate and remove the dust cap from the motor to expose slotted motor shaft.
The motor shaft is free to rotate, but must be secured to remove the impeller. To
secure the motor shaft, insert a flat bladed screw driver in slot to hold the shaft
stationary.
9. Locate and remove impeller locking screw. Using a socket and ratchet, the
impeller retaining screw can be removed. Once removed, the impeller can be
“unthreaded” from the motor shaft to expose the pump seal assembly.
10. Remove all seal parts. Note seal component arrangement to facilitate
reassembly.
11. Clean the motor shaft and lubricate with a mild soap solution.
12. Install new stationary seal member in pump casing cavity. Be certain the
stationary seal member is fully squared and seated in cavity.