Case CX300C Seal Kits & Cylinders

Case CX300C Seal Kits & Cylinders parts list
Image	Fits Model	Description	Details	Part #	Price	Product Details
	See Details	CX240BLR, CX250C, CX260E LC, CX290B, CX300C	Dipper Arm Cylinder Seal Kit		MMV80090	$228.00	View Info

Hydraulic cylinder seal kits and replacement cylinders for the Case CX300C excavator, covering dipper arm cylinder seal kits and related hydraulic components for reliable digging performance.

Fits Models At A Glance

CX C Series: CX250C, CX300C
CX B Series: CX240BLR, CX290B
CX E Series: CX260E LC

Key Notes

Application: Dipper arm cylinder seal kits for excavator hydraulic circuits
Components: Rod seals, piston seals, wipers, and O-rings in complete kits
Fitment: Cross-compatible across multiple CX series excavator models
Condition: New replacement seal kits and cylinder assemblies available

Why Choose Broken Tractor

✅ Verified fitment for Case excavator hydraulics
✅ Fast shipping from two US locations
✅ Knowledgeable support for cylinder rebuilds

Frequently Asked Questions

What does the dipper arm cylinder seal kit for the Case CX300C include?

The seal kit includes rod seals, piston seals, wipers, and O-rings to service the dipper arm cylinder on the CX300C hydraulic circuit. It is a complete kit intended for rebuilding a worn cylinder rather than replacing the entire assembly. Broken Tractor lists this seal kit under SKU MMV80090.

Does the CX300C dipper arm seal kit fit other Case excavator models?

Yes, this seal kit (SKU MMV80090) is cross-compatible across several Case CX series excavators, including the CX240BLR, CX250C, CX260E LC, CX290B, and CX300C. Because fitment can vary by serial number, match the part number to your machine or confirm with our parts team before ordering.

Should I rebuild the CX300C dipper arm cylinder or replace the whole cylinder?

If the cylinder body and rod are still in good shape, rebuilding it with the seal kit (SKU MMV80090) restores sealing without the cost of a full assembly. If the rod is scored or the barrel is damaged, a complete replacement cylinder is the better choice. Broken Tractor carries both new replacement seal kits and cylinder assemblies for Case excavators.

What are signs the dipper arm cylinder seals on a Case CX300C are worn?

Common signs include hydraulic oil leaking around the rod or wiper, the dipper arm drifting or sagging under load, and slower or weaker digging performance. These symptoms usually point to failed rod or piston seals that a seal kit can address. If leaks continue after resealing, inspect the rod and barrel for wear.

How do I confirm the right seal kit for my Case CX300C?

Match the part number on your existing cylinder to the seal kit, since fitment can depend on serial number and configuration. Our seal kit for the CX300C is listed under SKU MMV80090. For help confirming the correct kit, call our parts team at (800) 909-7060.