There are probably tens of thousands of Ingersoll Rand P185 tow behind air compressors in use and for sale around the world. I have not been able to get any specific information on this venerable compressor from IR, except that it’s a portable – being that it’s a towed air compressor – and that it’s supposed to provide 185 CFM of air flow when running optimally.
What’s here on this Ingersoll Rand P185 Tow Behind Compressor page?
- status on the P185
- a 185 compressor manual and parts manual for no-charge download
- library of questions and responses
- section to ask your own question about this model and get help from other users
It appears as though Ingersoll Rand is no longer selling portable construction compressors, preferring to manufacture and sell construction equipment like jackhammers and what not as well as industrial air compressors.
We understand that the portable construction compressor business was sold to Doosan Portable Power. If you have information confirming this, we would appreciate an update via the comment form below.

Have a look, add your question here about the Ingersoll Rand P185 tow behind air compressor, and if you can help another user with some knowledge or advice, please add a comment.
All IR P185 compressor users, and me, say thanks,
Just in – Ingersoll Rand 185 manual.
And a big thank you to Doug from S.D.Ca for this P-185 parts manual.
Feel free to download either to your computer.
Having an issue with your Ingersoll Rand (IR) P185 tow behind air compressor?
If you scan the existing postings below, you may find an answer already there. If not, scroll to the bottom of the page and add your question.
Can you answer one? Please leave your advice as a comment on any of the existing postings about the IR P-185 air compressor.
Thanks from all of us.
Bill
Existing Ingersoll Rand P185 tow behind compressor questions and responses:
Ingersoll Rand 185 won’t stay running
Adjust air pressure on an I/R 185
Ingersoll Rand 185 pumping oil with air
Ingersoll Rand P185WJD parts catalogue
I/R 185 spitting hydraulic oil
Ingersoll Rand 185 intermittent shut down
Ingersoll Rand 185 blowing air out of pressure relief
Hi, I have a 94’ ingersoll-rand 185 pull behind unit. Worked fine until yesterday. For some reason when you turn it on it runs really high, same high (speed) when you push the service air button before it lowers its idle to normal. It runs high and nothing happens, you push the service air button and nothing happens not is there trapped pressure anywhere, as if the air compressor is not even connected to the engine. It just turns on and stays idling high. Need some help….
In need of a set of doors for a 175/185 tow behind compressor please let me know if anyone out there has any or knows where to possibly get some. Thank you.
I would like to swap the Yanmar engine in my Ingersoll Rand 185 air compressor with a John Deere engine. Is there conversion instructions out there?
Can’t find a parts diagram for the 185 we have. Need a radiator cap that has no numbers on it to help identify it. Runs the 3179 for the motor if that helps. Have the serial number but can’t find the model. Tried some of the local auto parts to match and there’s no old school people that know how to use a micrometer anymore
We currently own a 2002 185 Ingersoll Rand We’re looking for a trailer kit for it Can I buy a universal one
Hi i have a 185 WIR. Any body know the difference between the WIR i have and the WJD referenced above?
Does an Ingersoll Rand P185 tow behind need a license plate in California?
My R185 is blowing smoke out of the air valve on the front, the same valve I use for my jack hammer?
I see the operator manual on this site but not the parts manual if you could point me in that direction?