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Specifications Information and Repair Parts Manual  

     

3941-96, 3942-D6, 3943-96, 3944-96 & 3946-96

                                                           

3941-252-00

1

6/2016

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 specifications 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.

3-Inch Trash Pump

Refer to form 1808-633-00 for General Operating and Safety Instructions.

MAINTENANCE

To prevent accidental starting, always remove the spark plug or 

disconnect and ground the spark plug wire before attempting to service 

or remove any component. 

CLEANING

These units are designed so that for most cleanout or clogging problems it 

should not be necessary to remove hoses or piping. The suction area and 

impeller chambers can be reached by removing (2) threaded handles (Ref. No. 

22), suction cleanout cover plate (Ref. No. 21) and gasket (Ref. No. 20). 

NOTE:

 When replacing cleanout cover plate, carefully wipe clean all surfaces 

on which the gasket has contact. Also, make sure the gasket is in position.

MECHANICAL SEAL REPLACEMENT 

Refer to figures 1 and 2.

NOTE:

 Always replace the seal seat (Ref. No. 8), seal cartridge (Ref. N. 9), 

and shaft sleeve (Ref. No. 10) to ensure proper mating of mechanical seal 

components!

1.  Unthread cap screws (Ref. No. 24) to remove casing (Ref. No. 19) and 

casing seal (Ref. No. 7) from adapter (Ref. No. 9).

2.  Unthread screws (Ref. No. 13) and remove volute (Ref. No. 14) from 

adapter.

3.  Unscrew impeller (Ref. No. 12) from the engine shaft. Remove the 

impeller shims (Ref. No. 11), shaft sleeve and seal cartridge from engine 

shaft. Use a rubber mallet or soft block of wood to loosen impeller. Turn 

counterclockwise.

4.  Unthread cap screws (Ref. No. 3) and remove the adapter from the engine 

mounting face.

5.  Push seal seat from the adapter recess with a screwdriver.

6.  Clean the adapter recess before inserting a new seal seat.

7.  Carefully wipe the polished surface of the new seal seat with a clean cloth.

8.  Wet the rubber portion of the seal seat with a light coating of soapy water.

9.  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).

10.  After the seal seat is in place, ensure that it is clean and has not been 

marred.

11.  Using a clean cloth, wipe the shaft and make certain that it is perfectly 

clean.

12.  Secure the adapter on the engine mounting face.

NOTE: 

Tighten cap screws EVENLY to avoid cracking rabbet on engine 

mounting face.

13.  Apply a light coating of soapy water to the inside rubber portion of seal 

cartridge and slide onto the shaft sleeve. Slip the shaft sleeve with seal 

cartridge onto the engine shaft.

IMPORTANT:

 Before installing new shaft sleeve, apply a bead of non-

hardening, pliable sealant (such as Permatex® Form-A-Gasket® No. 2) to 

motor shaft shoulder.

14.  Replace any impeller shim removed in disassembly.

15.  Screw the impeller back in place tightening until it is seated against shims 

and shaft sleeve.

16.  Remount volute with fasteners.

17.  Refer to section entitled SHIM ADJUSTMENT at this time if shaft sleeve 

or any other parts listed therein have been replaced.

18. 

Inspect position of flapper valve assembly (Ref. No.15) to ensure proper 

movement and seating.

19.  Replace o-ring seal on volute rabbet.

NOTE:

 Always inspect o-ring seals. Replace when cracked or worn. Wet 

o-ring with soapy water for ease of assembly.

20.  Remount casing.

21.  Remount any other parts and reconnect spark plug wire. Pump should 

now run with renewed original performance.

SHIM ADJUSTMENT

1.  When installing a replacement impeller, engine, shaft sleeve, adapter or 

volute, it may be necessary to vary the number of impeller shims (Ref. 

No. 11) that will be required. This is easily done by adding one 0.010” 

shim more than was removed and reassembling pump as described in 

Mechanical Seal Replacement section.

2. 

Ensure that volute (Ref. No. 14) and adapter (Ref. No. 4) are fitted firmly 

(check fastener Ref. Nos. 3 & 13). Remove spark plug wire from engine 

and turn engine over by pulling the recoil starter. If engine does not run 

freely, disassemble pump and remove one shim.

3.  Proper running clearance is 0.010”.

4.  Follow the above procedure until proper clearance is obtained. This will 

ensure maximum performance.

DESCRIPTION

These trash pumps are high capacity, heavy duty, centrifugal, engine driven, self-priming (to 20 ft. lift) portable units. The pumps are equipped with a precision 
lapped mechanical seal to reduce leakage, carrying handle and a clog-resistant impeller capable of handling solids up to 1-1/2” diameter (up to 25% by volume). 

A 3” NPT suction strainer is included. Handles liquids from 40º to 180º F (4º to 82º C). For use with nonflammable liquids compatible with pump component 

materials.

NOTE:

 Electric-start models require a 12-volt, 32 amp hour battery (not included).

Содержание 3941-96

Страница 1: ...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 10 After the seal seat is in place ensure that it is clean and has not been marred 11...

Страница 2: ...surfaces does the cast iron wearplate show deterioration Occasionally a stone or hard object might get caught in the impeller and cause damage to the volute cutwater In these cases follow the instructions below for replacement and refer to Figure 1 1 Disassemble pump for access as described in Mechanical Seal Replacement steps 1 and 2 2 Replace parts as necessary NOTE When replacing volute wearpla...

Страница 3: ... 96 3944 96 3946 96 3941 252 00 3 6 2016 For Repair Parts contact dealer where pump was purchased Please provide following information Model Number Serial Number if any Part description and number as shown in parts list Figure 2 Repair Parts Illustrations 3 Inch Trash Pump ...

Страница 4: ...s Ref No 16 16 Flat Head Screw SS 1 17 3 NPT Male Discharge Flange Kit 3941 080 90 1 includes Flange 4 Bolts and Gasket 17A Fill Plug and O Ring kit 3SXB 170 90 1 18 3 4 NPT Pipe Plug 1 19 Casing 2113 001 00 1 20 Cleanout Gasket Incl w Ref KIT 1 21 Cleanout Plate 2115 002 01 22 Cleanout Handle 1601 000 00 2 23 Flat Washer 2 24 Hex Head Screw 4 25 Flat Washer 8 26 Raising Block 1990 021 00 2 27 Hex...

Страница 5: ...Specifications Information and Repair Parts Manual 3941 96 3942 D6 3943 96 3944 96 3946 96 3941 252 00 5 6 2016 NOTES ...

Страница 6: ...Specifications Information and Repair Parts Manual 3941 96 3942 D6 3943 96 3944 96 3946 96 3941 252 00 6 6 2016 NOTES ...

Страница 7: ......

Страница 8: ...www amtpump com ...

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