Air Compressor- Piston & Rod Assy (4P3966)

DescriptionAir Compressor- Piston & Rod Assy for sale, with part number 4P3966. Give us a call to get a fast online quote to verify options, pricing and availability. We are available Mon-Fri 8am-5pm EST to assist you.

Part #: 4P3966
Weight: 4.31

WARNING : Cancer and Reproductive harm. See www.P65Warnings.ca.gov

*Please call to help verify fitment and always confirm the part number before ordering.

Pricing & Availability

This part is quoted individually — new, rebuilt and used options are often available. Get a fast online quote, or call or text a real parts person.

Call or Text 1-800-255-6253

Quotes answered Mon–Fri 8am–5pm EST

Fitment Guarantee If it doesn’t fit, we make it right — fast.

Fast Order Processing Most orders ship within 1–2 business days.

Real Parts People Call, text, or chat with a parts expert.

Fits These Machines

Partial list from OEM application data. Not sure? Call or text us with your model and serial number and we’ll verify fitment.

Caterpillar 24

120H NA 14G 1673C 163H 160H NA 160H 14H 160K 160H ES 143H 140K 2 140K 140H 140H ES 140G 135H 12H NA 12K 12H 120K 12H ES 120K 2 120H ES 120H

About Our Conditions

Condition	What you get	Warranty
New Aftermarket	New aftermarket part made to fit this application, AMS-branded, hardware kit included	12 months
Rebuilt	Professionally rebuilt to spec; refundable core charge, return label provided (30 days, same part number, rebuildable)	6 months
Used	Inspected used take-offs — call or text for current availability and pricing	Call for details

Not all inventory / options shown. Our goal is to provide new, rebuilt and used options! Call or get a quick quote!

Don't see what you're looking for? New aftermarket, used and rebuilt options!

Need a little extra help? Give one of our friendly, knowledgeable parts experts a call and we'll have your machine back up and running in no time.

Call a Parts Expert!

Cody Debord did a fantastic job finding the the final drives for my old obsolete excavator, working through all the issues and patiently solving one problem after another, until I was up and running and completely satisfied with the entire experience...

Jim Holmes

Dealt with Brandon G. Dude knows his parts and had what I needed. We received the part and due to the value I decided it was safer to use brand new. I paid for return shipping and received a credit back for the part. The whole process was smooth.

Matt Boike

Brooke Bussard has always went above and beyond great customer service. I have dealt with her 4-5 times in the past year and every time she has been awesome to work with. She’s always gotten me everything at a great price.

Jason Stewart

Customer support is very helpful, Racheal communicated promptly and professionally. I even had a concern with a certain product and pricing that didn’t work out as planned, and one of the managers, Matt, emailed me directly to take care of the situation...

Marc Hadfield

Knowledgeable and helpful staff, good pricing and availability on in stock or sourced parts.