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Old 07-11-2011, 07:56 PM
Andyman Andyman is offline
Join Date: Nov 2009
Location: Florida
Posts: 231
Default Oil gun for grease fittings

I remember a thread not to long ago talking about converting a grease gun into a oil gun but we never heard much about how to do it or got any pictures. After my first failed attempt with a pistol grip grease gun i gave it another shot and bought a small lever gun from wal-mart. it seems to work great with just a zerk fitting put in it. I can't use it on my mill till i get a flexible hose on it.

How to:
remove the plunger
take the rubber washer and metal washer add the correct size bolt and secure it at the bottom
put some oil in it turn upside down and pump

here is a good site to read through but hopefully my pictures help someone.

1- A picture of the gun
2- The nut on the end of my bolt. If mine is held right side up it does leak i'm considering filling in the hole with weld.
3- no oil
4- a few pumps later oil comes out the fitting
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Old 07-12-2011, 07:26 AM
Lu47Dan's Avatar
Lu47Dan Lu47Dan is offline
Connoisseur of Old Iron
Join Date: Mar 2006
Location: N/W Pa.
Posts: 6,031

Andy, a new piston with twin o-rings might seal the oil inside the grease gun so you don't have to turn it upside down, just thread the piston end of the rod instead of having it pass through the piston.
Remember that you are operating a "High Pressure" grease gun not a "Low Pressure" oil gun. If you are pumping the oil into a sealed area the high pressure could blow a seal out. My JD 420 calls for a heavy oil for the rollers on that support the crawler on the rails of the tracks and a low pressure gun is not available anymore (the oil is not available either). So the cure is JD Cornhead grease in a high pressure gun, and to remember those seals are expensive to buy and take a day to replace.
Once I get started on the crawler I will modify a HP gun to a lower pressure to pump the cornhead grease.
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Old 07-12-2011, 11:56 AM
Andyman Andyman is offline
Join Date: Nov 2009
Location: Florida
Posts: 231


The reason you have to turn the gun upside down is so the oil can flow into the piston. Leaving it right side up it would only sit at the bottom since it isnt being compressed like grease. The reason it leaks from the bottom of the tube is because its not sealed good so if held right side up oil runs out of the tube
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Old 07-12-2011, 08:46 PM
Lew Hartswick Lew Hartswick is offline
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Join Date: May 2008
Location: Albuquerque NM
Posts: 4,831

I just use the gun without the plunger / cap and hold it with the open end up.
I had to change the zerks on the knee of the Bridgeport to 45 deg ones so
they point up and the one on the end of the table to a 90 deg, I believe.
Store it in an open top gallon can in an upright fashion.
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