AMT 2820-98, Specifications Information And Repair Parts Manual, Page: 3 / 8

[Type text]
2761-257-00 3 2/2015
Specifications Information and Repair Parts Manual 2820-98, 2820-99, 2760-99, & 2761-99
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BEARING HOUSING SERVICE FOR MODELS
2760-99, 2820-98 AND 2761-99
1. Remove the front pump assembly as described under
Mechanical Seal Replacement (Steps 1, 2 & 3).
2. Disassemble the bearing housing (Ref. No. 12) from pump
adapter (Ref. No. 19) by removing the four hex head cap
screws (Ref. Nos. 20 and 21).
3. Remove the shaft bearing (Ref. No. 22) and shaft (Ref. No.
14) as an assembly by first removing the snap ring (Ref. No.
17). Push the shaft bearing assembly out of the bearing
housing by rapping on the threaded end of the shaft with a
soft mallet, or block of wood and a hammer.
4. The ball bearings can now be removed from the shaft.
5. If shaft bearings have been removed from shaft, replace by
sliding bearing on shaft to shoulder. Replace shaft bearing
assembly by sliding assembly into housing threaded end
first. Push shaft bearing assembly completely in by gently
tapping on keyway end of shaft with a soft mallet. Replace
snap ring.
6. Reverse steps 1 thru 3 to reassemble pump.
IMPORTANT: After pump is assembled, it is necessary to rotate pump
shaft by hand to check for striking of the impeller. If striking or rubbing
occurs, adjust impeller shims as required (See Shim Adjustment).
BEARING HOUSING SERVICE FOR MODEL 2820-99
1. Remove the front pump assembly as described under
Mechanical Seal Replacement (Steps 1, 2 & 3).
2. Remove the shaft bearing assembly (Ref. No. 14) by first
removing the snap ring (Ref. No. 17). Push the shaft bearing
assembly out of the bearing housing by rapping on the
threaded end of the shaft with a soft mallet, or block of wood
and a hammer.
3. Flinger washer (Ref. No. 13) will come loose at this time.
4. Replace shaft bearing assembly by sliding assembly into the
housing, threaded end first. Push shaft bearing assembly
completely in by gently tapping on keyway end of shat with a
soft mallet. Replace snap ring.
5. Reverse steps 1 thru 3 to reassemble pump.
IMPORTANT: After pump is completely assembled it is necessary to
rotate pump shaft by hand to check for striking of the impeller. If
striking or rubbing occurs, adjust impeller shims as required (See Shim
Adjustment).
SHIM ADJUSTMENT
When installing a replacement impeller (Ref. No. 6), it may be
necessary to vary the number of shims (Ref. No. 16) that will be
required. This is done by adding one shim more than was removed
and reassembling the pump as follows:
IMPORTANT:
When the clearance between the impeller and casing
(Ref. No. 5) exceeds 1/16" at the face of the impeller or 1/8" on the
outside diameter of the impeller, it may be necessary to take corrective
action.
1.
Insure that the casing is snugly in place and check the shaft
(Ref. No. 14) to make sure it is turning freely. If it turns
freely, check to insure that the adapter (Ref. No. 19) or
bearing housing (Ref. No. 12) and casing are firmly seated,
compressing gasket (Ref. No. 11) where they meet on the
outside. If a gap exists, tighten the fasteners (Ref. No. 1) and
recheck the shaft for free turning. Tighten carefully, turning
shaft while tightening. If shaft seizes before fasteners are
completely tight, disassemble pump and remove one shim
and repeat reassembly.
2. If at any time during shim adjustment the shaft does not turn
free or the impeller strikes when turning the shaft, repeat
Shim Adjustment procedure.