What kind of grease for Chicago Pneumatic impact wrench clutches? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-15-2013, 05:13 PM
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What kind of grease for Chicago Pneumatic impact wrench clutches?

I brought home a new Chicago Pneumatic CP7748 1/2" impact wrench today from the local NAPA store. In the owners manual it calls for "CP Pneu-Lube Synthetic Clutch Grease 8940158455" for the clutches. It's a "Molybased Clutch Grease", described as "Synthetic grease, specially formulated to extend the life of your CP impact wrench clutches". All the impact wrenches I've had before you take a little plug out and put air tool oil in the clutches. I called the NAPA store, they don't know anything about this lube, and they don't have any of it.

Do any of you guys know what grease I can use in this. This is the highest load 1/2" wrench anybody makes as far as I know, it's rated at 920 ft/lbs in reverse. I figure this thing will either break the rusted bolts in the spring shackles on my wife's S10 loose or flip the truck over backwards! I wonder if I can just use a regular chassis grease that has "moly" in it? Thanks in advance for any help you can give me, I really need to get the better half's truck fixed!
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Old 08-15-2013, 06:55 PM
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I have always used Marvel Air tool oil and never had any problems. My 1/2" CP impact is over 30 years old and has never been apart. My CP 3/8" ratchet is about 20 years old and still going strong as is my 3/8" CP impact.

Vince
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Old 08-15-2013, 07:34 PM
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The older CP and a Campbell Hausfeld impact (both are shot) I have both take air tool oil to lube the cluthes, but this new one doesn't have the allen screw to take out to put in oil, it has a small grease fitting where you have to use one of the "needles" for a grease gun to put the grease in.
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