Case Backhoe Engine Oil Cooler parts list
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680K, 680L, 780C, 780D, 850D/E/G, 850K Series 1, 1150E/G/H, 855D/E, 1155E, W14B/C, 621, 621B/C/D, 1088, 9030, 9030B, CX290 |
Engine Oil Cooler (5.9) |
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J921558 |
$85.00
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See Details
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580 Super E, 580K, 580 Super K, 580L, 580 Super L, 480E, 480F |
Engine Oil Cooler |
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J921557 |
$85.00
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View Info |
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Engine oil coolers for Case backhoe loaders running Cummins 4B/4BT390 and 6B/6BT590 power, including replacement cooler assemblies for 580 and 680 series machines.
Fits Models At A Glance
- 580 Series (4B/4BT390): 580 Super E, 580K, 580 Super K, 580L, 580 Super L
- 480 Series (4B/4BT390): 480E, 480F
- 680 Series (6B/6BT590): 680K, 680L
Key Notes
- Application: Transfers heat from engine oil to maintain operating temperature under load.
- Engine Coverage: Cummins 4B/4BT390 and 6B/6BT590 platforms.
- Part Numbers: J921557 for 4-cylinder, J921558 for 6-cylinder applications.
- Condition: Replacement coolers built to OEM fitment specs.
Why Choose Broken Tractor
- ✅ Verified Cummins engine and model fitment
- ✅ Fast shipping from two US locations
- ✅ Knowledgeable team backing every Case order
Frequently Asked Questions
What engine oil cooler fits a Case 580K backhoe?
The Case 580K uses engine oil cooler J921557, which is built for the Cummins 4B/4BT390 4-cylinder engine. The same cooler fits the 580 Super E, 580 Super K, 580L, 580 Super L, 480E and 480F backhoes. Broken Tractor offers it as a replacement cooler built to OEM fitment specs.
What oil cooler fits a Case 680K or 680L backhoe?
The Case 680K and 680L take engine oil cooler J921558, made for the Cummins 6B/6BT590 6-cylinder engine. It is the 6-cylinder counterpart to the J921557 cooler used on 580 and 480 series backhoes.
What is the difference between Case oil cooler J921557 and J921558?
The difference is the engine they fit. J921557 is for Case backhoes with the 4-cylinder Cummins 4B/4BT390, and J921558 is for backhoes with the 6-cylinder Cummins 6B/6BT590. Check which Cummins engine is in your machine before ordering, because the two coolers are not interchangeable between engine platforms.
What does the engine oil cooler do on a Case backhoe?
The engine oil cooler transfers heat out of the engine oil so the engine stays at its proper operating temperature under load. On Case backhoes with Cummins 4B/4BT390 and 6B/6BT590 engines, it is part of the engine cooling setup that protects the engine during heavy digging and loading work.
How do I make sure I order the right oil cooler for my Case backhoe?
Start with your backhoe model and the Cummins engine it runs, then match it to part number J921557 for the 4B/4BT390 or J921558 for the 6B/6BT590. If your machine has had an engine swap or you are unsure of the original engine, compare the part number on your old cooler or confirm with our parts team. You can call (800) 909-7060 for help verifying fitment.
