CASE A. 7K1151 - Caterpillar

Illustration 5 g06124040
Insert a 1/2 inch ratchet into the square hole in the belt tensioner to release the tension on the belt.
Use the ratchet to rotate the belt tensioner in the clockwise direction.
Remove the old belt, and discard the belt.
Illustration 6 g06124042
Install the new belt.
Allow the belt tensioner to rotate in a counter clockwise direction, and remove the 1/2 inch ratchet when the tensioner engages the new belt.
Illustration 7 g06124043
Check the belt tensioner. If the tensioner is against either one of the stops, discard and replace the tensioner.Refer to Disassembly and Assembly, KENR8384, "797F Engine Supplement", "Belt Tightener - Remove and Install" for more information on replacement of the belt tensioner.
Illustration 8 g06124044
Install the belt guards.
Install the belt guard bolts, and tighten the bolts to the proper torque.Alternator Belt and Tensioner
Inspection
Illustration 9 g06250205
Inspect the belt through the sight window.
Illustration 10 g06250202
(A) New belt
(B) Worn belt
Inspect the condition of the serpentine belt. Over time the belt ribs will lose material (C). The space between the ribs will increase (D). The loss of material will cause the pulley sheave to contact the belt valley. This will lead to belt slippage and accelerated wear (E). Replace the belt if the belt is worn or frayed.Note: Refer to Special Instruction , M0086279 for additional information on belt failure.
Illustration 11 g06250214Note: This engine is equipped with a belt tensioner that automatically adjusts the belt to the correct tension. The tensioner for the belt cannot be adjusted. Make sure that the belt tensioner is between the stops to allow proper tension on the belt.
Check the belt tension. If the tensioner is against either one of the stops, discard and replace the belt.Note: Belts that have more than 4,000 hours have exceeded the intended life target for most applications. Extension of life is possible for some applications through regular belt inspections.Replacement
Illustration 12 g06124051
Remove the belt guard bolts, and store the bolts for reuse.
Remove the belt guards, and store the guards for reuse.
Illustration 13 g06124053
Insert a 1/2 inch ratchet into the square hole in the belt tensioner to release the tension on the belt.
Use the ratchet to rotate the belt tensioner in a counter clockwise direction.
Remove the old belt, and discard the belt.
Illustration 14 g06124070
Install the new belt.
Allow the belt tensioner to rotate in a clockwise direction, and remove the 1/2 inch ratchet when the tensioner engages the belt.
Illustration 15 g06124060
Check the belt tensioner. If the tensioner is against either one of the stops, discard and replace the tensioner.Refer to Disassembly and Assembly, KENR8384, "797F Engine Supplement", "Belt Tightener - Remove and Install" for more information on replacement of the belt tensioner.
Illustration 16 g06124065
Install the belt guards.
Install the belt guard bolts, and tighten the bolts to the proper torque.