CALL or TEXT (800) 909-7060

Parts Request Blog About Us Contact Us Account

Case Dozer Engine Belt Tensioner

Case Dozer Engine Belt Tensioner parts list
Image	Fits Model	Description	Details	Part #	Price	Product Details
	See Details	40XT, 60XT, 70XT, 75XT, 85XT, 90XT, 95XT, 480E, 480E LL, 580E, 580 Super E, 580K, 580 Super K, 590 Turbo, 680L, 650, 650G, 750H, (750K Series I), 850D, 850E, 850G, 850H, (850K Series I), 855D, 855E, 1150E, 1150G, 1150H, 1155E, 1840, 584E, 585E	Engine Belt & Tensioner Kit		BT-CASE-BELT-TENS-KIT	$74.00	View Info
	See Details	480E, 480F, 580K, 580SK, 590, 680K, 680L, 780C, 780D, 450C, 550, 550E, 550G, 550H, 650, 650G, 650H, 650K, 750H, 750K, 850D, 850E, 850G, 850H, 850K, 1150E, 1150G, 1150H, 455C, 855D, 855E,1155E, 521D, 621, 621B, 621C, 75XT, 85XT, 90XT, 95XT	Fan Support Bracket (60mm)		J911922	$214.00	View Info
	See Details	40XT, 60XT, 70XT, 75XT, 85XT, 90XT, 95XT, 570LXT, 570MXT, 580K, 580 Super K, 580L, 580 Super L, 580M, 580 Super M, 590 Turbo, 590 Super L, 590 Super M*, 680K, 680L, 780C, 780D, 450C, 550, 550E, 550G, 650, 650G, 650K, 750K, 850E, 850G, 850H, 850K, 1	Bearing, Fan Support		J910739	$54.00	View Info
	See Details	480E, 480E LL, 580E, 580 Super E, 580K, 580 Super K, 590 Turbo, 680L, 650, 650G, 750H, 750K Series I, 850D/E/G/H, 850K Series I, 855D/E, 1150E/G/H, 1155E, 1840, 40XT, 60XT, 70XT, 75XT, 85XT, 90XT, 95XT, 584E, 585E, 586E, 621	Engine Fan Belt (Cummins Engine)		J911559	$18.00	View Info
	See Details	480E, 480F, 580 Super E, 580K, 580 Super K, 580L, 580 Super L, 590 Turbo, 590 Super L, 680L, 780C, 580M, 580 Super M, 590 Super M, 450C, 650K, 750H, 850K, 1150G, 1840, CX130, CX160, 688, 880D, 9010, W11B, W14B, 621, 721, 821, 836C, 845B, 885, etc	Engine Belt Tensioner		J936203	$64.00	View Info

Engine belt tensioners, fan belts, fan support bearings, and complete belt and tensioner kits for Case crawler dozers running Cummins engines, covering multiple generations of 450, 550, 650, 750, 850, and 1150 series machines.

Fits Models At A Glance

450 Series: 450C, 455C
550 Series: 550, 550E, 550G, 550H
650 Series: 650, 650G, 650H, 650K
750 Series: 750H, 750K
850 Series: 850D, 850E, 850G, 850H, 850K
855 Series: 855D, 855E
1150 Series: 1150E, 1150G, 1150H, 1155E

Key Notes

Application: Drives and maintains tension on the cooling fan and accessory belt system
Engine: Fits Cummins-powered Case crawler dozers
Components: Belt tensioners, fan belts, fan support bearings, and full kits available
Condition: New replacement components for reliable service life

Why Choose Broken Tractor

✅ Cummins-specific fitment verified across Case dozers
✅ Fast shipping from two US locations
✅ Knowledgeable support for tensioner and belt matching

Frequently Asked Questions

What does the engine belt tensioner do on a Case dozer?

The belt tensioner drives and maintains proper tension on the cooling fan and accessory belt system on Cummins-powered Case crawler dozers. Keeping the belt at the correct tension helps the fan and accessories run reliably and reduces belt slippage and premature wear. We carry new replacement tensioners such as SKU J936203 for Case dozer applications.

Which Case dozer models does the fan belt and tensioner kit fit?

The Engine Fan Belt & Tensioner Kit (SKU BT-CASE-BELT-TENS-KIT) fits Cummins-powered Case dozers including the 650, 650G, 750H, 750K Series I, 850D, 850E, 850G, 850H, 850K Series I, 855D, 855E, 1150E, 1150G, 1150H, and 1155E. Because fitment can vary by serial number and series, match the part number to your machine or confirm with the parts team before ordering.

Do I need to replace just the belt or the tensioner too on a Case 850D?

You can replace the fan belt on its own with SKU J911559, but if the tensioner is worn or the belt has been running loose it is worth replacing both together. Broken Tractor offers a complete Engine Fan Belt & Tensioner Kit (SKU BT-CASE-BELT-TENS-KIT) that covers the 850D and other Cummins Case dozers so the belt and tensioner are matched.

What is the fan support bearing for on a Cummins Case dozer?

The fan support bearing supports the cooling fan assembly so it spins true and holds proper belt alignment. A worn support bearing can cause noise, wobble, and uneven belt wear. We carry the Cummins Engine Fan Support Bearing (SKU J910739) and the Case Cummins Engine Fan Support (SKU J911922) for many Case dozer models.

How do I confirm the right belt tensioner for my Case dozer?

Match the part number to your machine and verify by your model and serial number, since fitment can differ across the 450, 550, 650, 750, 850, 855, and 1150 series. Our support team can help you match the correct tensioner, belt, or fan support for your Cummins-powered Case dozer; call (800) 909-7060.

Privacy Policy | Terms & Conditions

Building Quality Since 2006 | Copyright © 2026 Broken Tractor LLC - All Rights Reserved