AMT 4292-96, Specifications Information And Repair Parts Manual

[Type text] 
 

4292-251-00 1 

2/2015 

Specifications Information and Repair Parts Manual

4292-96

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 specifications 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 insure 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. 

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 nonflammable, non-abrasive liquids compatible with pump component materials. 
  

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 flats 

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 flats. 
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 first) 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. 
 

SHIM ADJUSTMENT 

When installing a replacement impeller (Ref. No. 9) or motor (Ref. No. 
1), it may be necessary to vary the number of shims (Ref. No. 8) to 
insure proper running clearance between impeller and casing (Ref. No. 
10).  
 
Proceed as follows: 

NOTE: 

A proper running clearance is less than 0.0l0. 

1. 

For impeller replacement, add one 0.010" shim in addition to 
those removed originally. 

2. 

For motor replacement, add two 0.0l0" shims removed 
during assembly. 

3. 

Reassemble pump using MECHANICAL SEAL 
REPLACEMENT for reference. 

IMPORTANT: 

Insure that casing is in place and check shaft to make 

sure it is turning freely (use screwdriver slot or two flats at rear of 
motor to turn shaft). If it turns freely, check to insure that casing cover 
and casing are fitted metal-to-metal where they meet on outside. If 
they are not metal-to-metal, tighten hex nuts (Ref. No. 12) 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. 

Figure 1- Mechanical Seal Replacement