Question about Chicago Pneumatic 1/2" Heavy Duty Air Ratchet - CP828H

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Chicago Pnuematic air ratchet runs continuously

When air is attached the ratchet automatically runs without squeezing the trigger

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Under the lever you push to make it operate you will se a pin .if this pin is stuck down the ratchet will run all the time.also this could be a bad O ring on this same part,

Posted on May 31, 2009


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When trigger is pushed lost of air through the exhaust. never spins ratchet

take some oil and lube the head of the ratchet real good and then take a wrench and put it over the square socket attachement and try working it back and forward and also keep working the position knob .if this frees it up put 5 or 6 drops of oil in the air intake connector and plug yor air line into it and pull yor trigger .remember run it in both directions.hope this helps.

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The manual is available here: . This is a global edition of the manual with only a few pages of information in each language. The important pages pages 1 and 12-13, if English is your primary language.

I hope this helps.

Cindy Wells

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Where do you oil the air ratchet

Put a few drops in the end where the air hose connects every time you use it. Put oil in the air inlet end and squeeze the trigger to force the oil through to lubricate the rotor vanes and bearings. Also do this before you store the ratchet in the drawer so that oil sits in the ratchet protecting the internals when not in use keeping the rust away.

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See your Snap-on sales rep. or get it repaired at your local air tool repair centre. It is basically a Chicago Pneumatic ratchet.

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1 Answer

I have an old Chicago Pneumatic 3/8 air ratchet. It appears to be a CP 886 or CP 828? I hooked it up the first time and it started up without the handle being pushed down? Air comes out of the top and...

Hi and welcome to FixYa, I am Kelly. I apologize for the much delayed response but I was helping another customer and your post appeared after I answered that post so I am going to respond now.

You will have to determine the part number of your Air drive.

The seals are dried out and cracked. Also the spring for the trigger is probably broken or the plunger is stuck down.

The CP828 parts can be found here:
The parts you probably need are items 3, 5, 7, 30 and 34. Possibly even item 109. That just repairs the trigger. You still need to repair the motor and head. See item 800 of the link for the repair kit. $33.75 Also note what item numbers above are in the kit.

The repair kits can be also located here: Notice there are several versions of the CP air motors. I send this link because there are three types of ratchet heads and it lists both the CP828 and CP886 repair parts.

You should be able to breathe life back into this thing with just a repair kit.... and possibly a few other trigger parts.

Thanks for choosing FixYa,

Feb 26, 2011 | Chicago Pneumatic Air Tools & Compressors

1 Answer

My air impact runs without squeezing the trigger.

if u take the tail outa ur gun u will see that da gause filter inside has broke gone inside and holding da valve open pick it out wit a seal pick r somethin

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1 Answer

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The trigger valve is leaking. Disassemble it and find if the seal has failed or is sticking. This is a fairlky common problem with air tools,
ake sure you ALWAYS out air tool oil in the tools daily.

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My 1/4 ratchet operates with air applied, without moving the pin. The pin and spring are there and free. This ratchet has sat in my tool box for 10+ years. Was there a plastic "ball" that used to be in...

Most CP ratchets have an oring that seals the trigger valve. You can remove the screw on the top of the trigger and then remove the spring and valve pin. There should be an oring around the bell of this pin. You can probably get away with using any oring that is the same size, and not having to get the exact oring from the manufacturer.

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1 Answer

Ratchet Question

* Are easy and economical to use. * Have fewer moving parts for longer wear. * Provide more power and torque than many electric-powered tools.

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