Thrush PC2G - Manual (Page 5)

4. Remove all relief, cooling, flushing or drain lines, if present, from the pump.
5. Remove capscrews (30) from bracket (15) and pull bracket assembly from casing (28).
Remove casing gasket (27).
6. Unscrew impeller bolt (35) and remove impeller washer (34), taking care not to damage
gaskets (33 & 36).
7. Slide impeller (37) and impeller key (14) from the shaft, again taking care not to damage
sleeve gasket (23) located behind impeller. Remove sleeve gasket (23).
8. Casing wear ring (39) is pressed into casing (28) with an interference fit and must be
removed with a “puller” if replacement is necessary.
9. If replacing seal cartridge assembly (19,20,21, & 22), slide seal assembly off the shaft.
10. If replacing mechanical seal only (21 & 22), slide seal assembly off the shaft (19).
Remove snap ring (20) at spring end. Remove spring and seal head (22). The rubber in
seal head (22) may be partially adhered to shaft sleeve (19). Remove seat and O-Ring
(21). The sleeve should be carefully cleaned to remove any residue in seal area and
checked for abrasion or corrosion. The sleeve under the seal may be polished lightly to
32 RMS finish before replacing seal assembly (21 & 22). DO NOT REUSE A PITTED
SLEEVE.
11. The seal cavity of the bracket (15) should be cleaned of all residues. Make sure the
1/32-inch radius in the seal cavity is not damaged during disassembly since a sharp edge
can easily cut the O-Ring during re-assembly.
12. Remove capscrews (26) and washers (25) to take off support foot (24).
13. Remove impeller key (14) from the shaft and remove water slinger (66).
NOTE: THE MECHANICAL SEAL IS A PRECISION PRODUCT AND MUST BE TREATED AS
SUCH. DURING REMOVAL, GREAT CARE MUST BE TAKEN TO AVOID DROPPING ANY
PART OF THE SEAL. TAKE PARTICULAR CARE NOT TO SCRATCH THE LAPPED FACES
ON THE WASHER OF THE SEALING SEAT. DO NOT PUT A SEAL BACK INTO SERVICE
UNTIL THE SEALING FACES OF THE WASHER AND SEAT HAVE BEEN LAPPED OR
REPLACED.
REASSEMBLY
1. Mount bracket (15) by screwing capscrews (30) and pipe plug (31) evenly into motor to
assure alignment. Turn the capscrews in an even amount. Attach the bracket support
foot (24) by placing washers (25) over capscrews (26) and screwing them into position.
2. Thoroughly inspect the seal cavity in the bracket for burrs or nicks which could damage
the seat of the seal. APPLY A FILM OF SOAP PASTE OR FLAX SOAP (DO NOT USE
OIL OR GREASE) TO THE SEAT AND O-RING (21).
3. If replacing seal cartridge assembly, remove cardboard spacer and slide assembly (19,
20, 21 & 22) onto motor shaft.
4. If it is not possible to insert seal assembly with fingers, press into place a piece of tubing
with the end cut square and with matching diameter. Tubing should be slightly larger