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Operating Instructions and Parts Manual 

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3/18

2018 OEMTOOLS

MINI GREASE GUN 

WARNING

: If lubricating automotive parts, always 

reference the vehicle maintenance manual prior to use.

WARNING

: If lubricating automotive parts, always be 

cautious of moving parts and pinch points.

WARNING

: If lubricating automotive parts, park the 

vehicle on a level surface, turn the vehicle off, and chock 

all wheels prior to performing vehicle maintenance. 

WARNING

: Pressure will build within the Grease 

Gun during normal use. Keep extremities clear of the 

extension or adapters during use, as pressure may cause 

these fittings to burst or abruptly detach from the Head 

Assembly.

GREASE GUN CARTRIDGE INSTALLATION 

INSTRUCTIONS

1.  Unscrew the Head Assembly from the Cylinder of the 

Grease Gun.

2.  While supporting the Cylinder with one hand, slowly 

pull back the Follower Rod until fully extended. There is 

a narrow groove at the end of the Follower Rod that will 

lock into the End Cap of the Cylinder. 

3.  While supporting the Follower Rod with constant 

tension, allow the Follower Rod to lock into place.

WARNING

:

 

DO NOT place fingers between the 

Follower Rod and End Cap. If the locking mechanism fails 

or the Follower Rod is released prematurely, the spring-

loaded Following Rod will recoil rapidly which may cause 

personal injury.
4.  Remove the Plastic Cap from the Grease Cartridge. 

Insert the open end into the open Cylinder of the 

Grease Gun. Allow the bottom of the Cartridge to 

contact the lower rim of the Cylinder.

5.  Remove the seal from the top of the Grease Cartridge.

6.  Screw the Head Assembly back onto the Cylinder. 

Tighten completely, then unscrew about 1.5-2 turns.

NOTE: The Head Assembly needs to be loose to allow air 

to bleed from the Cylinder.
7.  Pull the Follower Rod and release locking mechanism. 

Carefully allow the Follower Rod to retract into the 

Cylinder. 

NOTE: Air will leave the Cylinder as the grease is pushed 

to the Head Assembly.
8.  Once air is released completely, tighten the Head 

Assembly completely.

9.  Pump the Lever Handle repeatedly, pressure will build 

and grease will begin to flow from the Coupler. 

PRODUCT MAINTENANCE

1.  Prior to each use, inspect the Grease Gun for damage 

and misaligned/leaking connections. Discontinue use 

if any damage that will affect the performance of the 

Grease Gun is noted.

2.  Check Coupler for any dirt or debris. Use a clean, dry 

cloth to remove.

3.  After each use and extended periods of storage, use a 

clean, dry cloth to wipe all grease and debris from the 

Grease Gun.

DISPOSAL

At the end of the useful life of the OEMTOOLS™ Mini 

Grease Gun, dispose of the components in accordance 

with all federal, state and local regulations.

TROUBLESHOOTING

Problem

Causes

Solutions

Grease Gun fails  

to dispense grease

Cold grease

Allow grease to warm  

(DO NOT attempt to heat Grease Gun)

Air is trapped in Cylinder

Loosen head, repeatedly pull the Follower Rod and 

allow to retract. This will “bleed” the trapped air.

Grease Gun Coupler/

Extension is blocked

Clean dirt and debris from the Head Assembly and 

Coupler/Extension

No suction/tension when  

the Lever Handle is operated

Piston is damaged

Replace Grease Gun

Grease leaks from the back  

of the gun

Grease is too thin  

for use with this Grease Gun

Use a thicker grease

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