Cat 955 Series Track Loader Cylinders

Cat 955 Series Track Loader Cylinders parts list
Image	Fits Model	Description	Details	Part #	Price	Product Details
	See Details	955L	Sem. (L.H.) Cylinder Tube		3G8080	$652.00	View Info

Cat 955 Series Track Loader Cylinders

This category covers bucket lift and tilt cylinder tubes and rebuild parts for Caterpillar 955 series crawler track loaders — the long-running 955K and 955L "Traxcavator" machines. These loaders were built in huge numbers and are still working on farms and small job sites today, so replacement cylinder tubes and seal kits keep them digging and loading. Broken Tractor stocks cylinder tubes and rebuild components ready to ship, all built to accept OEM-style seal kits.

Fits Models At A Glance

955K, 955L — with cylinder tube coverage across serial ranges 61H, 71J, 85J, 64J, 08Y, 13X, and 57M

Fitment note: The 955K became the 955L at serial 85J6247, when Caterpillar switched from the D330 engine to the 3304. The cylinders and seal kits carry across both models, but confirm your serial number before ordering, and note whether you need the left-hand or right-hand tube.

What's In This Category

Cylinder Tubes

Semi-finished left-hand cylinder tube (3G8080) for the 955L. This is the tube half of the bucket lift/tilt cylinder — replace it when the bore is scored or worn but the rod, gland, and piston are still serviceable. The 3G8080 is the left-hand mate to the 3G8081 cylinder used across the 955K and 955L.

Rebuild Reference — Cylinder Numbers & Specs

The 955K and 955L bucket cylinders across all serial ranges (61H1-UP, 71J1-UP, 85J1-UP, 08Y1-UP, 13X1-UP, 57M1-UP, 64J1-UP) carry cylinder numbers 3G8081, 5J6213, 5J6214, 7J9637, and 7J9638 with a 2-1/2" rod and 5" bore. A second cylinder set (6J2339, 6J2340, 8J5713, 8J5704, 8J8498) runs a 2" rod and 4-1/2" bore. Match your cylinder casting number and rod/bore dimension when ordering a seal kit.

Fitment Tip

The 955K and 955L share the same cylinder and seal-kit design across the entire production run, so the seal kits fit all serial numbers (61H, 71J, 85J, 64J, 08Y, 13X, 57M). The catch is which cylinder you have — the loader uses cylinders in two sizes: a 2-1/2" rod / 5" bore group and a 2" rod / 4-1/2" bore group. Look at the casting number stamped on the cylinder tube and measure the rod to confirm which you're rebuilding. The "X" suffix sometimes seen on serial numbers (like 85J875X) is just a factory identifier and is ignored for parts lookup — your real serial is the number without the X. The 955 serial number and cylinder casting numbers are the fastest way to match the right part. Call us with them and we'll confirm before you buy.

Frequently Asked Questions

What cylinder tube fits my Cat 955L track loader?

The semi-finished left-hand cylinder tube 3G8080 fits the 955L. It's the tube portion of the bucket lift/tilt cylinder and is the left-hand mate to the 3G8081 cylinder used across the 955K and 955L. Because it's a semi-finished tube, confirm your machining requirements and whether you need the left-hand or right-hand side before ordering.

Do the 955K and 955L use the same hydraulic cylinders?

Yes. The 955K and 955L share the same bucket cylinder and seal-kit design across the entire production run. The 955K officially became the 955L at serial number 85J6247, when Caterpillar switched from the D330 engine to the 3304 (78P prefix), but the cylinders carried over. Seal kits fit all serial ranges — 61H, 71J, 85J, 64J, 08Y, 13X, and 57M.

How do I know which seal kit my 955 cylinder needs?

The 955K/955L uses cylinders in two sizes. One group (cylinder numbers 3G8081, 5J6213, 5J6214, 7J9637, 7J9638) has a 2-1/2" rod and 5" bore. The other group (6J2339, 6J2340, 8J5713, 8J5704, 8J8498) has a 2" rod and 4-1/2" bore. Look at the casting number stamped on your cylinder and measure the rod diameter to determine which seal kit you need before ordering.

What does the "X" mean at the end of my 955 serial number?

The "X" suffix on a Cat serial number (for example, 85J875X) is a factory identifier that shows where the machine was built. It's superfluous for parts and serial lookups and is ignored by the Cat parts system. Your true serial number is the number without the X — so 85J875X is looked up as 85J0875. Use the number without the X when ordering cylinder parts.

Is my 955 a K or an L model?

The 955L replaced the 955K starting at serial number 85J4672, but the engine changeover happened later — the 3304 engine (78P prefix) came in from 85J6247 and up, while earlier machines used the D330. If your serial is below 85J6247 and the engine hasn't been swapped, it likely has a D330 and may still be badged as a K. The cylinders and seal kits are the same either way, so for parts purposes the K/L distinction doesn't change your cylinder order.

Where is the serial number on a Cat 955 track loader?

The 955K and 955L serial number is on the machine's serial number plate and is also stamped on the frame. It's an 8-character serial like 85J11513. You'll also want the casting number stamped on the cylinder tube itself when ordering cylinder tubes or seal kits, since the 955 uses two different cylinder sizes.

Not sure which cylinder tube or seal kit fits your machine? Call or text us at (800) 909-7060 or submit a parts request and we'll match it to your serial and cylinder casting number.