JCB Excavator Coolant Expansion Tank parts list
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JS360, JS370, 406, 407, 409, TM180, TM220, TM220, 506-23TC, 508-66TC, 509-23TC, 509-45TC, 510-55TC, 526-56, 527-58, 531-70, 532-60, 532-70AG, 533-105, 535-125, 535-140, 535-95, 536-60DS, 536-95AG, 538-60AG, 538-70AG, 540-140, 540-170, 540-180R, 540-2 |
Coolant Expansion Tank |
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334/G3689 |
$162.21
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JS360, JS370, 406, 407, 409, TM180, TM220, 4160, 4190, 506-23TC, 508-66TC, 509-23TC, 509-45TC, 510-55TC, 526-56, 527-58, 531-70, 532-60, 532-70, 533-105, 535-140, 535-95, 536-60DS, 536-70, 536-95, 538-60, 538-70, 540-140, 540-170, 540-180R, 540-200, |
Coolant Expansion Tank (Tier 4 Machines) |
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334/G3688 |
$126.09
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3CX, 4CX, JS200, JS220, JS330, JS360, JS460, 407ZX, 408ZX, 409, 409ZX, 411, 412S, 416, 2155, 2170 |
Coolant Expansion Tank |
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331/34633 |
$104.00
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Coolant expansion reservoir tanks for JCB excavators, designed to maintain proper coolant levels and system pressure across a wide range of JS-series machines. Available with or without sensor provision to match Tier 4 and earlier engine configurations.
Fits Models At A Glance
- JS200 Series: JS200, JS220
- JS300 Series: JS330, JS360, JS370
- JS400 Series: JS460
Key Notes
- Sensor Compatibility: One variant includes integrated sensor provision for Tier 4 engine monitoring systems
- Cap Included: Select tanks ship with pressure cap fitted
- Application: Coolant overflow and pressurized expansion control for JCB excavator cooling systems
- Part Numbers: Covers OEM references 331/34633, 334/G3688, and 334/G3689
Why Choose Broken Tractor
- ✅ Direct OEM cross-reference for accurate fitment
- ✅ Fast shipping from Baton Rouge, LA and Kimbolton, OH
- ✅ Knowledgeable staff ready to confirm compatibility
Frequently Asked Questions
Which coolant expansion tank fits a JCB JS200 or JS220 excavator?
Broken Tractor offers the coolant expansion tank under OEM reference 331/34633 for the JCB JS200 and JS220. The same tank is also listed for the JS330, JS360 and JS460 excavators. Match the part number on your old tank before ordering to confirm fitment.
Which coolant expansion tank fits a JCB JS360 excavator?
The JCB JS360 has three listed options: 331/34633, 334/G3688 and 334/G3689. The correct tank depends on your machine's engine configuration and serial number, including whether it has a Tier 4 engine with coolant sensor monitoring. Check the part number on your existing tank, or call (800) 909-7060 so the parts team can confirm the right one.
What is the difference between JCB coolant tank 334/G3688 and 334/G3689?
The 334/G3688 is a coolant expansion reservoir tank that ships with the pressure cap fitted. The 334/G3689 includes an integrated sensor provision for Tier 4 engine monitoring systems. Both are listed for the JCB JS360 and JS370 excavators, so pick the version that matches your engine setup.
Does a JCB excavator coolant expansion tank come with a cap?
Some do. The 334/G3688 reservoir tank ships with the pressure cap already fitted. For the other tanks Broken Tractor carries, check the product listing or confirm with the parts team before ordering if you need a cap.
What does the coolant expansion tank do on a JCB excavator?
The coolant expansion tank handles coolant overflow and pressurized expansion in the JCB excavator cooling system. It helps keep the coolant level and system pressure where they should be as the engine heats up and cools down. On Tier 4 machines, the sensor version also works with the engine monitoring system.
