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Operating Instructions and Parts Manual 

25818

4/17

2017 OEMTOOLS™

Air Grease Gun

LOADING INSTRUCTIONS

Loading Grease Cartridge
1.  Remove the head from grease gun body.
2.  Pull back on the T-handle until the follower is fully retracted 

into the container tube and locked into position.

3.  Remove the cap from the grease cartridge and place the open 

end into the body.

4.  Push the cartridge completely into the body.
5.  Twist slightly to seal the follower in the tube.
6.  Remove the seal from end of grease cartridge.
7.  Screw the head back onto the body.
8.  Release the lock on the follower rod and push into the body.
9.  Prime the gun by fully extending and closing the lever handle a 

few times.

10. You are now ready to use the grease gun.

BULK LOADING WITH GREASE FILLING PUMP

(with OEMTOOLS™ 25780, 25748 and 25750)

NOTE: 

Always remove the old grease cartridge if installed.

1.  The proper filler adapter for the pump should be installed onto 

the grease gun.

2.  Insert the filler adapter into the filler fitting on the pump.
3.  Hold the grease gun firmly to the filler pump and fill the  

grease gun.

SUCTION FILLING

1.  Remove the head from the body of the grease gun.
2.  Stick the open end of the grease gun 2” into the grease.
3.  Pull the follower rod back into the grease gun, filling the body 

with grease. 

4.  Lock the rod when it is fully retracted.
5.  Replace the head.
6.  Release the follower rod and push it into the body.
7.  The gun is now ready for use.

NOTE:

 If you experience an air lock during the operation of 

the gun, loosen the head of the gun half way to one full turn, 

allowing the air to escape. Re-tighten the head and continue 

use of the grease gun.

Figure Description

Qty.

1

Body

1

2

Air Fitting

1

3

Switch

1

4

Trigger Pin

1

5

Trigger

1

6

Body Screw

4

7

Air Plunger

1

8

Short Spring

1

9

Housing Cap

1

10

Adapter

1

11

Hex Spout (Nylon)

1

11B

Nozzle

1

12

Filler Plug

1

13

Air Vent Valve

1

14

Gasket

1

15

Plunger Nut

1

17

Plunger

1

18

Backlash Gasket

1

19

Long Spring

1

20B

Container Tube

1

21

Container Cap

1

22

Piston Rod

1

23

Plunger Handle

1

24

Catch Plate

1

PARTS LIST

PARTS DIAGRAM

NOTE:

 

Not all components of the Grease Gun are replacement items, but 

are illustrated as a convenient reference for location and position in 

the assembly sequence. 

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