JCB Backhoe Reservoir Tank

JCB Backhoe Reservoir Tank parts list
Image	Fits Model	Description	Details	Part #	Price	Product Details
	See Details	3CX, 4CX, JS200, JS220, JS330, JS360, JS460, 407ZX, 408ZX, 409, 409ZX, 411, 412S, 416, 2155, 2170	Coolant Expansion Tank		331/34633	$104.00	View Info

Coolant expansion tanks and coolant reservoir replacements for JCB backhoe loaders, covering the 3CX and 4CX series machines across multiple generations of use. These tanks maintain proper coolant system pressure and fluid levels, helping prevent overheating and engine damage in demanding job site conditions.

Fits Models At A Glance

3CX / 4CX Series: 3CX, 4CX

Key Notes

Application: Coolant expansion and overflow reservoir for backhoe loader cooling systems
Part Reference: OEM-equivalent coolant expansion tank; cross-references to JCB part 331/34633
Condition: New replacement units available for direct swap fitment
Compatibility Tip: Verify chassis serial number before ordering to confirm correct tank configuration

Why Choose Broken Tractor

✅ OEM-matched fitment for JCB backhoe cooling systems
✅ Fast shipping from Baton Rouge, LA and Kimbolton, OH
✅ Experienced parts team ready to verify compatibility

Frequently Asked Questions

What expansion tank fits a JCB 3CX backhoe?

Broken Tractor offers a coolant expansion tank, SKU 331/34633, that fits the JCB 3CX backhoe loader. It is an OEM-equivalent replacement that cross-references to JCB part 331/34633. Tank configuration can vary, so verify your chassis serial number before ordering.

Does the JCB 3CX expansion tank also fit the JCB 4CX?

Yes, the coolant expansion tank we carry, SKU 331/34633, fits both the JCB 3CX and 4CX backhoe loaders. Fitment can still depend on your machine's configuration, so match the part number to your old tank or confirm your chassis serial number first.

What does the coolant reservoir tank do on a JCB backhoe?

The coolant expansion tank holds overflow coolant and helps maintain proper coolant system pressure and fluid level on JCB 3CX and 4CX backhoes. Keeping that system working correctly helps prevent overheating and engine damage during hard work on the job site.

Is the replacement JCB backhoe expansion tank new or used?

The coolant expansion tank Broken Tractor offers for the JCB 3CX and 4CX is a new, OEM-equivalent replacement unit. It is designed for direct swap fitment in place of the original tank, JCB part 331/34633.

How do I make sure I order the right reservoir tank for my JCB backhoe?

Start by checking your chassis serial number and matching the part number on your old tank to JCB part 331/34633. Tank configuration can differ between JCB 3CX and 4CX machines, so confirming those details helps avoid ordering the wrong tank. If you are unsure, call our parts team at (800) 909-7060 to verify compatibility.