Thrush PC2G - Manual (Page 6)

than the diameter of the shaft. Spring tension will probably prevent the sleeve from
remaining in position axially until the impeller is locked against it.
5. When replacing mechanical seal only (21 & 22) wipe the sealing faces of the seat and
seal washer clean. Lubricate these surfaces and shaft sleeve (19) with a clean soap
solution. Put seat and O-Ring (21) on shaft sleeve (19), smooth side to pump end. Slide
the entire rotating assembly onto the sleeve. Carbon in seal head must mate with seal
seat.
6. Replace snap ring (20). The shaft sleeve with the seal rotating assembly on it may not
be replaced onto the pump shaft. Spring tension will probably prevent the sleeve from
remaining in position axially until the impeller is locked against it.
7. Press casing wear ring (39) in casing if change is necessary. Rings should not be
hammered into place. Use a press, or clamp the parts in a bench vise, using wooden
blocks to protect the rings. It may be necessary to pin or dowel the rings after assembly
if the insert of casing has had rings replaced before, since each re-assembly can stretch
or tear metal and thereby loosen the fits. If the facilities are available it is good practice
to take a very light finish cut or to ream the inside diameter of the casing rings after
pressing to restore roundness. When rings are pressed, they may get squeezed out of
shape.
8. Replace bracket wear ring (16) in bracket (15), if applicable.
9. Carefully place sleeve gasket (23) on motor end of impeller. Assemble impeller key (14)
and impeller (37) to shaft. Secure impeller with impeller washer gasket (33), impeller
washer (34), impeller bolt gasket (36) and impeller bolt (35),
10. Replace casing gasket (27) on bracket (15). Slide entire motor-bracket assembly into
casing (28) being careful not to damage casing gasket (27). With assembly properly
positioned in casing (28), replace capscrews (30). Turn all capscrews in and tighten
evenly. Replace all hold down bolts securing motor assembly to foundation.
11. Install the two pipe plugs (29) in the pump casing. Position the casing gasket (27) and
casing (28) against the pump bracket and secure with capscrews (30).
12. Replace all relief, cooling, flushing or drain lines.
13. Read carefully the section of the manual titled – INSTALLATION.
14. Connect electricity to the motor.
15. Open suction and discharge valves.
SERVICE
The THRUSH pump requires no maintenance other than periodic inspection, occasional cleaning
and lubrication of bearings. The intent of inspection is to prevent breakdown, thus obtaining
optimum service life. The liquid end of the pump is lubricated by the fluid being pumped and
therefore does not require periodic lubrication. The motor, however, may require lubrication, in
which case, the motor manufacturers’ recommendation should be followed.