PILOT-BEARING 3734733 - Caterpillar

Illustration 1 g03120939
(Belt guard removed for visibility)
View of the belt and the belt tensioner on the front of the engine
(1) Belt tensioner Engine Belt Inspection
Inspect the belt for wear and for cracking. Replace the belt if the belt is not in good condition.Check the belt tension according to the information in the SpecificationsManual, "Belt Tension Chart".Slippage of loose belts can reduce the efficiency of the driven components. Vibration of loose belts can cause unnecessary wear on the following components:
Belts
Pulleys
BearingsReplacement
Remove the belt guard.
Illustration 2 g03123244
Typical belt tensioner installation
(2) Square hole for ratchet
Insert a ratchet with a square drive into the square hole that is located in the tensioner for the belt.
Rotate the tensioner counterclockwise in order to relieve tension on the belt. Remove the belt.
Install the new belt correctly, as shown. Be sure that the belt is fully seated on the pulleys. The correct tension will automatically be applied when the ratchet is removed.
install the belt guard. Adjusting Fan Drive Belts
Note: Prior to tensioning, check the threaded rod for lubricant. The threaded portion should be lubricated.Note: For correct tension, follow the instructions on the OEM drawing for the specific radiator. The deflection distance and force will be listed. If the force is given in Newtons (N), then convert to kgf by dividing by 9.81.
Remove pulley guards.
Loosen the four fasteners on the idler system.
Using a belt tension tool, set the lower marker at the deflection distance required on the lower scale. Set the upper marker ring against the edge of the top tube.
Place the belt tension tool against the top of the belt at the center of the span. Apply a force at right angles to the belt. Apply enough force to deflect the belt to the point where the marker ring is level with the top of the adjacent belt.
Adjust the tension until the belt tension tool indicates approximately 8.5 kgf.
To adjust the tension, adjust the locknut of the threaded adjusting rod.
Turn the nut clockwise to shorten the rod and increase belt tension. Turn the nut counterclockwise to lengthen the rod and decrease belt tension. Note: Do not over tension the belts.
Tighten the four fasteners on the idler system. Torque fasteners to 210 N m (155 lb ft).
Install pulley guards.
Run engine for 20 minutes. Recheck belt tension.