DAYCO PRODUCTS LLC 89947 belt tensioner for the 2008-2024 Freightliner Cascadia 6-cylinder 14.8L, the 2009-2024 Cascadia 6-cylinder 12.8L, the 2011-2024 Cascadia 15.6L and other vehicles holds the drive belt at the right tension while the engine runs.
- Automatic belt tensioner that keeps tension on the drive belt
- Belt drive position: alternator and air conditioning, fan, water pump and main drive
Quick facts
- Part: DAYCO PRODUCTS LLC 89947 belt tensioner
- Also called: serpentine belt tensioner
- Fits: the 2008-2024 Freightliner Cascadia 6-cylinder 14.8L, the 2009-2024 Cascadia 6-cylinder 12.8L, the 2011-2024 Cascadia 15.6L and other vehicles
- Position: Alternator and air conditioning, fan, water pump, main drive
Before you replace the tensioner, rule out the belt itself and the accessories it drives, since a worn belt or a tired alternator or water pump bearing can make similar squeals. A worn serpentine belt tensioner can show up as squealing or chirping from the belt area, belt wear on one edge, or a pulley that looks loose or wobbly. The engine takes one tensioner on its belt drive, and this listing is one.
Fits
This tensioner is listed for a wide range of Freightliner models, including the 2011-2024 Freightliner M2 112 6-cylinder 12.8L and the 2012-2024 114SD 6-cylinder 12.8L. If your truck is not named here, find its year and engine in the "Vehicles it fits" section.
Specifications
- Position: Alternator and air conditioning, fan, water pump, main drive
- Quantity per application: 1
- Type: automatic belt tensioner
Interchange: ALT09279 · 680030 · 49603 · 38667 · 689447 · 910585A
This part cross-references / interchanges with the following part numbers:
ALT09279, 680030, 49603, 38667, 689447, 910585A, 4722001070, A4722001070, A4722001570, EA4722000570, A4722000270, EA4722001070, 4722000570, 4722000870, 4722000970, 4722001470
Frequently Asked Questions
Is this the right Freightliner Cascadia belt tensioner for the 2009-2024 6-cylinder 12.8L?
Yes. DAYCO PRODUCTS LLC 89947 is listed for the 2009-2024 Freightliner Cascadia 6-cylinder 12.8L, and also for the 2008-2024 Cascadia 6-cylinder 14.8L and the 2011-2024 Cascadia 15.6L.
Is the DAYCO 89947 tensioner listed for the 2011-2024 Freightliner M2 112 6-cylinder 12.8L?
Yes. DAYCO PRODUCTS LLC 89947 is listed for the 2011-2024 Freightliner M2 112 6-cylinder 12.8L. For a different truck, look up its year and engine in the "Vehicles it fits" section.
Which belt drive positions is the DAYCO 89947 tensioner listed for?
The catalog position is alternator and air conditioning, fan, water pump, main drive. The listing is one tensioner.
Does DAYCO PRODUCTS LLC 89947 replace part number 910585A?
Yes. 910585A is a cross-reference number for DAYCO PRODUCTS LLC 89947, so a tensioner marked 910585A is replaced by this one.
What can I look at on a belt tensioner without running the engine?
With the engine off and cool, look for cracks, rust or oil on the housing and a pulley that sits crooked or wobbles. A shop can test belt tension and tensioner movement with the engine running.
