Specications Information and Repair Parts Manual 2761-98 thru 282D-98 & 2821-98 thru 282M-98
2761-255-00 1 9/2016
Please read and save this Repair Parts Manual. Read this manual and the General Operating Instructions carefully before attempting to assemble, install, operate
or maintain the product described. Protect yourself and others by observing all safety information. The Safety Instructions are contained in the General Operating
Instructions. Failure to comply with the safety instructions accompanying this product could result in personal injury and/or property damage! Retain instructions
for future reference. AMT reserves the right to discontinue any model or change specications at any time without incurring any obligation.
©2016 AMT Pump Company, A Subsidiary of The Gorman-Rupp Company, All Rights Reserved.
Periodic maintenance and inspection is required on all pumps to ensure proper operation. Unit must be clear of debris and sediment. Inspect for leaks and loose bolts. Failure to do so
voids warranty.
Self-Priming Centrifugal Pumps
High Volume Dewatering Stainless Steel Models
Refer to pump manual 1808-634-00 for General Operating and Safety Instructions.
MAINTENANCE
Make certain that unit is disconnected from power source before
attempting to service or remove any components!
NOTE: The pump casing should be removed and inspected periodically to
ensure that any foreign material is not clogging internal pump parts. This unit
is equipped with a dual volute pump casing. One of the volutes runs 180°, all
the way from the side opposite the discharge into the discharge through a
completely enclosed passageway. If foreign material clogs this area, it can be
dislodged by using a wire or long spring.
MECHANICAL SEAL REPLACEMENT
Refer to Figures 1 and 2
IMPORTANT: Always replace both seal seat (Ref. No. 7) and seal head (Ref.
No. 8) to ensure proper mating of components! Recommend replacing casing
seal (Ref. No.6) if wear or damage is present.
1. Unthread fasteners (Ref. No. 5) and remove casing (Ref. No. 12) and
casing seal (Ref. No. 6) from adapter (Ref. No. 4)
2. Unscrew impeller fastener (Ref. No. 11) and impeller (Ref. No. 10)
separately by turning each counterclockwise.
NOTE: Most motors use an open end 7/16” wrench across ats on rear of
motor shaft (remove bearing cap for access) to prevent shaft from turning.
Other motor shafts have a screwdriver slot instead of ats.
3. Unscrew fasteners (Ref. Nos. 3 & 16) and remove adapter, foot (Ref. No.
17) and handle (Ref. No. 2) from motor (Ref. No. 1) mounting face. Seal
head will come loose at this time.
4. Push seal seat from adapter recess with a screwdriver.
5. Clean adapter recess before inserting new seal seat.
6. Carefully wipe polished surface of new seal seat with a clean cloth.
7. Wet rubber portion of seal seat with a light coating of soapy water.
8. Press new seal seat squarely into cavity in adapter. If seal seat does not
press squarely into cavity, it can be adjusted in place by pushing on it with
a piece of pipe. Always use a piece of cardboard between pipe and seal
seat to avoid scratching seal seat. (This is a lapped surface and must be
handled very carefully.)
9. After seal seat is in place, ensure that it is clean and has not been marred.
10. Using a clean cloth, wipe shaft and make certain that it is perfectly clean.
11. Secure adapter, foot and handle on motor mounting face. Carefully guide
motor shaft through seal seat.
12. Apply a light coating of soapy water to inside rubber portion of seal head
and slide onto shaft (with sealing face rst) so that rubber portion is just
up over shaft shoulder.
Do not touch or wipe polished face of seal head.
13. Replace any impeller shims (Ref. No. 9) that may have been removed in
disassembly. (See “Shim Adjustment” below).
14. Screw impeller back into place, tightening until it is against shaft shoulder.
15. Replace impeller nut and tighten until snug.
16. Remount casing and casing seal on adapter.
SHIM ADJUSTMENT
When installing a replacement impeller (Ref. No. 10) or motor (Ref. No. 1), it
may be necessary to adjust number of shims (Ref. No. 9) to ensure proper
running clearance between impeller and casing. Proceed as follows:
NOTE: A proper running clearance is less than 0.010”.
1. For impeller replacement, add one 0.010”shim in addition to those
removed originally.
2. For motor replacement, add two 0.010” shims in addition to those removed
during disassembly.
3. Reassemble the pump as described in steps 15, 16 & 17.
IMPORTANT: Be sure that the casing is snugly in place and check shaft to
make sure it is turning freely (use screwdriver slot in motor to turn shaft). If it
turns freely, check to ensure that adapter and casing are tted tight together. If
they are not, tighten fasteners (Ref. Nos. 3, 5 and 17) and recheck shaft for free
turning. Tighten carefully, turning shaft while tightening so that motor bearings
are not damaged in the event that too many shims were installed. If shaft seizes
before fasteners are completely tight, disassemble pump and remove one shim
and repeat reassembly.
DESCRIPTION
These centrifugal pumps are self-priming (to 20 ft. lift) units designed for high volume liquid transfer, irrigation, dewatering, lawn sprinkling, etc. These pumps can
also accommodate semi-solids (up to 3/8” dia.), sediment laden liquids, and liquids with entrained air or gases. Units are constructed of 300 series investment
cast stainless steel and include Viton® elastomers. They are direct coupled to NEMA 56J frame, 3450 RPM motors which require eld wiring, no controls are
supplied. Each pump is equipped with a apper valve to shorten re-prime time after initially lling casing with liquid. Handles liquids from 40º to 200º F (4º to 93º
C). For use with nonammable, non-abrasive liquids compatible with pump component materials.
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AMT Pumps 282E-98
