Cat Excavator Thumb Cylinder

Cat Excavator Thumb Cylinder parts list
Image	Fits Model	Description	Details	Part #	Price	Product Details
	See Details	416D/E/F, 420D/E/F, 430D/E/F, 450E/F, 307D, 308D, 308E, 308E2 CR	Thumb Cylinder Seal Kit		2764172	$54.00	View Info

Replacement thumb cylinders and thumb cylinder seal kits for Caterpillar mini excavators, covering hydraulic thumb actuation components for 307D, 308D, and 308E series machines.

Fits Models At A Glance

307 Series: 307D
308 Series: 308D, 308E, 308E2 CR

Key Notes

Application: Hydraulic thumb clamping and material handling on mini excavators
Components: Complete thumb cylinders and seal kits for rebuilds
Cross Fitment: Select seal kits also fit 416-450 series backhoe loaders
Condition: New and rebuild-ready options available

Why Choose Broken Tractor

✅ Verified thumb cylinder fitment across Cat models
✅ Fast shipping from two US locations
✅ Knowledgeable staff for cylinder and seal matching

Frequently Asked Questions

What hydraulic thumb cylinder parts fit a Cat 308 excavator?

Broken Tractor carries the Cat thumb cylinder seal kit 2764172, which fits the 308D, 308E and 308E2 CR mini excavators. The kit is used to rebuild the hydraulic thumb cylinder that drives thumb clamping and material handling. Match part number 2764172 to the kit on your machine before ordering.

What thumb cylinder parts fit a Caterpillar 307 excavator?

For the Caterpillar 307D, Broken Tractor offers the thumb cylinder seal kit 2764172. The same kit also fits the 308D, 308E and 308E2 CR, so one part number covers several Cat mini excavator models.

Should I rebuild or replace a Cat excavator thumb cylinder?

It depends on the condition of your cylinder. Broken Tractor offers both complete thumb cylinders and seal kits for rebuilds. A seal kit like 2764172 is the choice when you plan to reseal your existing cylinder, and a complete cylinder is the choice when you want to swap the whole unit.

How do I make sure I order the right Cat excavator thumb cylinder seal kit?

Match the part number on your existing kit or cylinder and confirm your exact model, such as the 307D, 308D, 308E or 308E2 CR. Fitment can vary between machines, so if you are unsure, call (800) 909-7060 and our parts team can help match the correct cylinder or seal kit.