Perkins 1706J-E93TA Operation And Maintenance Manual page 86

86
Maintenance Section
Belts - Inspect/Adjust/Replace
Inspect
Illustration 65
To maximize the engine performance, inspect the
belt (3) for wear and for cracking. Replace the belt if
the belt is worn or damaged.
• Inspect the belt for cracks, splits, glazing, grease,
displacement of the cord and evidence of fluid
contamination.
Ensure that the belt tensioner is securely installed.
Visually inspect the belt tensioner (1) for damage.
Check that the pulley on the tensioner rotates freely
and that the bearing is not loose. Some engines have
an idler pulleys (2). Ensure that the idler pulleys are
securely installed. Visually inspect the idler pulley for
damage. Ensure that the idler pulley can rotate freely
and that the bearing is not loose. If necessary,
replace damaged components.
Adjust
Belt adjustment is automatic.
Replace
To replace the belt, refer to Disassembly and
Assembly, Alternator Belt - Remove and Install.
Belts - Inspect/Adjust/Replace
(Fan Belts)
Belt tension should be checked initially between the
first 20 to 40 hours of engine operation.
For applications that require multiple drive belts,
replace the belts in matched sets. Replacing only one
belt of a matched set will cause the new belt to carry
more load because the older belt is stretched. The
additional load on the new belt could cause the new
belt to break.
If the belts are too loose, vibration causes
unnecessary wear on the belts and pulleys. Loose
belts may slip enough to cause overheating. If the
belts are too tight, unnecessary stresses are placed
on the pulley bearings and on the belts. Belts that are
too tight may shorten the service life of the
components.
Inspect
To maximize the engine performance, inspect the
belts for wear and for cracking. Also, check for fluid
contamination. Replace belts that are worn or
damaged.
Adjust
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Illustration 66
Typical example
1. Remove the belt guard, refer to OEM for the
correct procedure.
2. Loosen lock nut (3). Rotating nut (4)
counterclockwise will move pulley (1) and loosen
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belts (2). Rotating nut (4) clockwise will move
pulley (1) and tighten belts (2).
3. With the correct tension set, tighten nut (3).
Tighten nut (3) to a torque of 102 N·m (75 lb ft).
4. Use a suitable belt tension tool to set the belt
tension.
M0087475-03
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