Checking Belt Tensioner Spring Tension and Belt Wear (7800)

Checking Belt Tensioners

Belt drive systems equipped with automatic (spring) belt tensioners cannot be adjusted or repaired. The automatic belt tensioners are designed to maintain proper belt tension over the life of the belt. If tensioner spring tension is not within specification, replace tensioner assembly.

Release tension on fan drive belt (A) and alternator/compressor belt (B) using a long handle (13 mm; 1/2-in.) breaker bar in tension arm.

Remove the belts.

Release tension on tension arm and remove breaker bar.

Replace tensioner assembly.

2. Check that the tensioner arm stop (X) is in contact with the fixed stop (Y).

If they do not have contact replace tensioner assembly.

A-Spring tensioner
B-Spring tensioner
X-Cast stop
Y-Cast stop

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Checking Belt Wear

The belt tensioner is designed to operate within the limit of arm movement provided by the cast stops (X and Y) when correct belt length and geometry is used.

Visually inspect cast stops (X and Y) on belt tensioner assembly.

If the tensioner stop (X) on swing arm is hitting the fixed stop (Y), check mounting brackets (alternator, belt tensioner, idler pulley) and belt length. Replace belt as needed.

X-Cast stop
Y-Cast stop

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