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M0087475-06
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
Illustration 82
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
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.
5. Reinstall the belt guard, refer to OEM for the
correct procedure.
If new drive belts are installed, check the drive belt
tension again after 30 minutes of engine operation at
the rated rpm.
Belt Tension Chart
Table 18
New Belt Tension
801 N (180 lb)
Replace
To replace the fan belts, refer to Disassembly and
Assembly, V-Belts- Remove and Install.
Belts - Replace
Note: This procedure applies to engines in constant
speed applications.
The fan belts must be replaced as a set.
For the correct procedure for removing and installing
the drive belts, refer to the Disassembly and
Assembly.
Coolant (Commercial Heavy-
Duty) - Change
Clean the cooling system and flush the cooling
system before the recommended maintenance
interval if the following conditions exist:
• The engine overheats frequently.
g06262893
• Foaming is observed.
• The oil has entered the cooling system and the
coolant is contaminated.
• The fuel has entered the cooling system and the
coolant is contaminated.
Note: Inspect the water pump and the water
temperature regulator after the cooling system has
been drained.
Maintenance Section
Belts - Replace
Used Belt Tension
Reset Tension
645 N (145 lb)
378 N (84 lb)
97
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