Specications Information and Repair Parts Manual 4292-96
4292-251-00 1 3/2015
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.
©2015 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.
1-inch Self Priming
Refer to pump manual 1808-634-00 for General Operating and Safety Instructions.
SPECIFICATIONS
Suction Inlet…………………………………………………………..1” NPT
Discharge Outlet……………………………………………………..1” NPT
Power Supply……………………………………………..……115V, 60 Hz
Motor………………….…1/2 HP, 3450 RPM NEMA 56J Frame, 1.0 S.F.
Basic Construction…………………………………….……Cast Aluminum
Seals……………………………..Carbon, Ceramic, SS w/ Buna-N Seals
MAINTENANCE
Make certain that unit is disconnected from power source before
attempting to service or remove any components!
MECHANICAL SEAL REPLACEMENT
Refer to Figures 1 and 2
IMPORTANT: Always replace both the seal seat and the seal head to
insure proper mating of mechanical seal components!
1. Unthread cap screws (Ref. No. 12) and remove pump casing (Ref.
No. 10) and O-ring (Ref. No. 5) from adapter (Ref. No. 3).
2. Unscrew impeller (Ref. No. 9) from the motor shaft.
NOTE: Some motors use an open end 7/16” wrench across the ats on the
rear of the motor shaft (remove bearing cap for access) to prevent shaft from
turning. Other motor shafts have a screwdriver slot instead of the ats.
3. Unthread cap screws (Ref. No. 4) and remove the adapter from the
motor mounting face. The seal head (Ref. No. 7) and the impeller
shims (Ref. No. 8) will come loose at this time.
4. Push seal seat (Ref. No. 6) from the adapter recess with a
screwdriver.
5. Clean the adapter recess before inserting a new seal seat.
6. Carefully wipe the ceramic surface of the new seal seat with a
clean cloth.
7. Wet the rubber portion of the seal seat with a light coating of soapy
water.
8. Press the new seal seat squarely into the cavity in the adapter.
If the seal seat does not press squarely into the cavity, it can be
adjusted in place by pushing on it with a piece of pipe. Always
use a piece of cardboard between the pipe and the seal seat to
avoid scratching the seal seat (this is a lapped surface and must be
handled very carefully).
9. After the seal seat is in place, ensure that it is clean and has not
been marred.
10. Using a clean cloth, wipe the shaft and make certain that it is
perfectly clean.
11. Secure the adapter on the motor mounting face. Reuse any shims
or spacers which may have been removed. Carefully guide motor
shaft through the seal seat.
12. Apply a light coating of soapy water to the inside rubber portion of
seal head and slide onto the shaft (with the sealing face rst) so
that the rubber portion is just over the shaft shoulder.
Do not touch or wipe the face of the carbon (black) part of the seal head.
13. Replace any shim washers which may have been removed in
disassembly.
14. Screw the impeller back in place, tightening until it is against the
shaft shoulder.
15. Remount O-ring and casing on the adapter.
IMPORTANT: Always inspect casing O-ring gasket (Ref. No. 5) whenever the
unit is disassembled. Replace when cracked or worn.
DESCRIPTION
This self-priming centrifugal pump is designed to handle many water transfer services such as storm draining, light irrigation, emergency water supply, swimming
pool and spa tub draining, etc. Pump can self-prime to 6 feet suction lift (with casing full of water), handling clear to sediment laden liquids containing solids up to
1/8” in diameter. Handles liquids from 40º F to 180º F (4º to 82º C). Pump is supplied with two 1” NPT x 3/4” garden hose adapters. For use with nonammable,
non-abrasive liquids compatible with pump component materials.
