AMT 316A-95, Specifications Information And Repair Parts Manual

Specifications Information and Repair Parts Manual  

316A-95, 316B-95, 393A-95, 393B-95, 

394G-95,  394H-5,  394J-95,  394K-95,  399D-95                                                           

394K-250-00

1

1/2017

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.

©2017 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.

Sewage/Trash Pumps

Refer to pump manual 1808-634-00 for General Operating and Safety Instructions.

Pumps must be operated in specific ranges as noted on respective curves 
on page 3 (Figure 3). Failure to adhere to curve will result in damage and 
cavitation to pump thus voiding warranty. 

UNPACKING

Refer to Repair Parts Illustration and Repair Parts List to aid in identifying 
parts. Unpack and separate all pump components from container making sure 
all parts are accounted for.

Package should contain:
1.  Pump and motor completely assembled.
2.  Suction strainer.
3. 

Specifications Information & Repair Parts Manual.

4. 

General Operating Instructions & Maintenance Manual.

MAINTENANCE

Note: 

For information pertaining to the motor and motor parts, consult the 

motor manual or contact the nearest authorized service representative or the 
manufacturer.

Make certain that the unit is disconnected from the power source before 
attempting to service or remove any component.

MECHANICAL SEAL REPLACEMENT

Should the mechanical seal, which consists of a seal seat (stationary) and seal 
head (rotating), require replacement, proceed as follows and refer to Repair 
Parts illustration that corresponds to your pump model (316A/B = Figure 4, 
393A/B = Figure 5, 394G/H/J/K = Figure 6, 399D = Figure 7). The seal should 
be replaced if the adapter or impeller is replaced. If the pump is equipped with a 
shaft sleeve (JM motor) it may be easier to replace the sleeve with the rotating 
seal head.

NOTE:

 Always replace the seal seat and head as a unit, never replace the seal 

seat or seal head individually.

316A & 316B:

1.  Remove four bolts (Ref. No. 9). Pull casing (Ref. No. 1) from adapter.
2.  Remove casing O-ring (Ref. No. 7). Remove screw (Ref. No. 11). Pull 

volute (Ref. No. 2) from adapter.

3.  Remove impeller lock nut (Ref. No. 18). Unscrew impeller (Ref. No. 3) 

from motor shaft (Ref. No. 17). Use a rubber mallet or soft block of wood 
to loosen impeller. Turn it counterclockwise. 

4.  Remove the impeller shim(s) (Ref. No. 4).
5.  Remove the seal head (Ref. No. 5) from motor shaft.
6.  Remove four screws (Ref. No. 13). Pull adapter (Ref. No. 8) from motor.
7.  Push seal seat (Ref. No. 6) from adapter. Clean seal seat bore in adapter.
8.  Check motor shaft for damage. Motor shaft must be smooth and free from 

scratches or score marks. Clean shaft of any debris or remnants of old 
seal head.

393:

1.  Remove four bolts (Ref. No. 9). Pull casing (Ref. No. 1) from adapter.
2.  Remove casing O-ring (Ref. No. 7). Remove two screws (Ref. No. 11). 

Pull volute (Ref. No. 2) from adapter.

3.  Using a hex key remove impeller screw (Ref. No. 18) and O-ring (Ref. No. 

25). Slide impeller (Ref. No. 3) from motor shaft (Ref. No. 17).

4.  Remove the impeller shim(s) (Ref. No. 4) and impeller drive key (Ref. No. 

21)

5. 

Slide the seal head (Ref. No. 5) off the shaft sleeve (Ref. No. 19).

6.  Remove four screws (Ref. No. 13). Pull adapter (Ref. No. 8) from motor.
7.  Push seal seat (Ref. No. 6) from adapter. Clean seal seat bore in adapter.

DESCRIPTION

This sewage/trash pump is a heavy duty, centrifugal, motor driven, self-priming (to 20 ft. lift) unit, after initially filling casing with liquid. Pump is equipped with a 

silicon carbide mechanical seal, cast iron wear surfaces and a stainless steel clog-resistant impeller. Units are used to handle water containing sewage, stones, 

sticks, mud and other solids: maximum diameter ½ the discharge NPT size. Handle liquids from 40º to 180º F (4º to 82º C) for use with nonflammable fluids com

-

patible with pump component materials. All units come with built-in suction check valve to aid priming efficiency and easily removable casing/clean out cover and 

volute for quick debris clean out. An NPT threaded seal wash port is provided on Models 393A-95, 393B-95, 394G-95, 394H-95, 394J-95, 394K-95 and 399D-95. 
Units are powered by totally enclosed fan cooled (TEFC) motors, single or three phase power. Motor includes stainless steel shaft or stainless steel shaft sleeve.

Figure 1 & 2 - Mechanical Seal Replacement