Case Dozer 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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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 crawler dozers powered by Cummins 4B/4BT390 and 6B/6BT590 engines, covering new and used cooler assemblies that regulate oil temperature and protect internal engine components under heavy load.
Fits Models At A Glance
- 850 Series: 850D, 850E, 850G, 850K Series 1
- 855 Series: 855D, 855E
- 1150 Series: 1150E, 1150G, 1150H
- 1155 Series: 1155E
Key Notes
- Application: Cools engine oil to maintain viscosity and prevent overheating
- Engine Fitment: Cummins 4B/4BT390 and 6B/6BT590 configurations
- Part Numbers: Cross-references include J921557 and J921558
- Condition: New and quality used cooler assemblies available
Why Choose Broken Tractor
- ✅ Verified fitment across Case dozer engine platforms
- ✅ Fast shipping from two US locations
- ✅ Knowledgeable support for hard-to-find parts
Frequently Asked Questions
What does the engine oil cooler do on a Case dozer?
The engine oil cooler regulates oil temperature to maintain viscosity and prevent overheating under heavy load. Keeping oil at the correct temperature helps protect internal engine components during sustained work. Broken Tractor carries new and quality used cooler assemblies for Case crawler dozers.
Which oil cooler fits a Case 850D dozer?
The Case 850D uses the oil cooler for the Cummins 6B/6BT590 engine, part number J921558. That same cooler also fits the 850E, 850G, 850K Series 1, 855D/E, 1150E/G/H, and 1155E dozers. Match the part number or confirm the engine configuration with our parts team before ordering.
What is the difference between the J921557 and J921558 oil coolers?
The J921557 cooler is built for the Cummins 4B/4BT390 engine, while the J921558 is for the Cummins 6B/6BT590 engine. Choosing the correct one depends on which Cummins engine your Case dozer runs. Confirm your engine configuration and match the part number so you order the right cooler.
How do I know if my Case dozer oil cooler is bad?
Signs of a failing oil cooler include engine oil running hotter than normal or trouble keeping oil temperature down under load, since the cooler is what maintains proper oil viscosity. A worn or clogged cooler can no longer regulate temperature and puts internal engine parts at risk. Broken Tractor offers new and used replacement cooler assemblies for these Case dozer engine platforms.
Do these oil coolers fit both new and older Case dozers?
Fitment covers a range of Case dozer models across the 850, 855, 1150, and 1155 series, and depends on which Cummins engine is installed. Because coverage varies by model and engine, match the part number to your machine or confirm fitment with the Broken Tractor parts team at (800) 909-7060 before ordering.
