Thrush OLD User Manual
Page 3
MAINTENANCE AND SERVICE
PUMP DIS-ASSEMBLY
1.
It is unnecessary to disconnect piping or casing to service GTV, TVB, and Old Style TV Series pumps. All
service and maintenance can be performed by removing pump assembly from casing.
2.
Disconnect wiring to the motor.
3.
Remove bolts (20), connecting casing (17) and adapter (6) and entire pump assembly can be withdrawn
from casing by lifting the motor.
4.
Remove impeller bolt (14) by turning it counter clockwise. Pull off the impeller by wedging around its
periphery and slip out the impeller key from its shaft groove.
5.
Slide spring-loaded carbon rotating face (9 & 10) off impeller shaft.
6.
Remove seal seat (8) and O-ring (7) from bracket. Clean seal cavity if required.
7.
Inspect shaft sleeve (4) for damage. Replace if necessary.
8.
The GTV, TVB, and Old Style TV shaft sleeve is a sweat fit to the motor shaft. To remove existing
sleeve, heat with torch until sleeve can be slid easily off the motor shaft. The same procedure is used to
install a new sleeve. Heat new sleeve until it slides on motor shaft. Allow cooling before installing new
seal.
PUMP RE-ASSEMBLY
1.
Lightly lubricate seal O-ring (7) with water-soluble soap and press stationary seal assembly into adapter
(6). (Do not use oil or grease).
2.
Slide seal assembly (9 & 10) onto shaft sleeve. Lubricate bellows with water-soluble soap.
3.
Replace impeller key (2) in shaft groove.
4.
Replace impeller cap screw and tighten by turning clockwise
5.
Remove old casing and adapter gasket and clean off any pieces that may have been broken off on the
casing. Put new gasket on adapter.
6.
Lower pump assembly into casing. Use caution to properly align impeller into casing so that it will be
damaged. Tighten up cap screws evenly and in rotation.
7.
Fill pump casing with water and vent all air by loosening air vent plug (5).
8.
Re-connect motor rewiring. Check motor rotation to insure proper operation. The motor should turn
clockwise when viewed from the motor end and counter-clockwise when viewed from the casing end.
Figure 1 - A & B