Page 16 of 38
Disassembly & Reassembly for 70A, 120A, & 330 Pumps
Minor Disassembly for Fluid Chamber Inspection
1.
Remove all burrs on drive shaft with a file or emery paper. Also check for any deposit of paint. Special care should be taken around
the keyway and beveled corner on the drive shaft. These two areas are normally where burrs occur. Burrs or paint will cause an
obstruction in the bushing area.
2.
Drain oil from gear case by removing lower drain plug (38). Remove six cap screws (41) on face of gear case cover (40).
3.
Remove gear case cover by sliding over shafts.
4.
If the timing gears (4) are a slip fit on the shafts. Check that the gears have the correct timing marks before removal. If necessary,
mark them again. Remove the gears by loosening the setscrews. There are two in each gear. Then slide gears off drive end of shaft.
If gear keys are sheared a gear puller may be required. NOTE: Mark gears so that in reassembly the gears may be remounted on
the shafts from which they were removed. Remove two gear keys.(6)
5.
If interference fitted (IF) timing gears (4) are furnished. Check that the gears have the correct timing marks before removal. If
necessary, mark them again. IF gears do not have setscrews. First attempt to remove them can be can be made with a standard gear
puller. If the gear puller was not successful in removing the gears, heat the gear OD with a torch and use a hydraulic jack to remove
the gears.
NOTE:
Mark gears so that in reassembly the gears may be remounted on the shafts from which they were removed. Remove two gear
keys.(6)
WARNING
Wear heat-resistant gloves when handling hot components.
6.
If Packing is used (reference assembly on page 13). Remove packing gland nuts (32) and slide packing gland (30) out of the way.
Then remove packing (29) from both seal chambers in the impeller housing. If pump is equipped with mechanical seals, see below
for general instructions and refer to the seal instructions that were shipped with the pump. Also, reference Page 39 for additional
packing information. If Tuffseals are used (reference assembly on page 15). Loosen Tuffseal set screws that lock the cartridge seal’s
collar onto the shaft, on the impeller housing side. Also, reference Page 40 for additional Tuffseal information. If mechanical seals
are used (reference assembly on page 17). Remove pipe plugs (24) from impeller housing stuffing boxes. This allows access to
the mechanical seal set screws holding the seal to the shaft. Mark the shaft where the mechanical seal is so that the correct seal
working length can be referenced upon re-assembly. Then loosen the mechanical seal set screws. Loosen the mechanical seal
gland nuts (32) and allow the mechanical seal gland to be loose on the housing. Thus, when the shafts are pulled out of this area
when removing the faceplate assembly the gland will not fall off. Allow it to hang loosely on the studs. Also, reference Page 41 for
additional mechanical seal information.
7.
Remove hex head bolts (23) on outboard side of faceplate. Make note on which side the drive shaft is located for reassembly.
Remove entire faceplate assembly by sliding away from impeller housing.
CAUTION
Faceplate assembly will be heavy and not balanced. Use proper lifting methods. This assembly includes the impellers and shafts
installed in the faceplate. CAUTION: DO NOT DISTURB the bearing carrier (19) on the bearing bridge on the faceplate. These caps
hold the adjustment of the clearance of the impellers in relation to the fluid chamber. If further disassembly is required, refer to major
disassembly instructions.
Fluid Chamber Check Points
Procedure No. 1 - Check for twisted shaft
1.
Place faceplate group upright in vise.