Fan Belt Adjustment
Illustration 66 g06109234
Typical example
1. Remove the belt guard, refer to OEM for the
correct procedure.
2. Loosen lock nut (3). Rotating nut (4) counter-
clockwise 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.
Replace
For applications that require multiple drive belts,
replace the drive belts in matched sets. Replacing
one drive belt of a matched set will cause the new
drive belt to carry more load because the older drive
belts are stretched. The additional load on the new
drive belt could cause the new drive belt to fail.
To replace the alternator belt, refer to Disassembly
and Assembly, Alternator Belt - Remove and Install.
To replace the fan belts, refer to Disassembly and
Assembly, V-Belts- Remove and Install.
Belt Tension
Table 16
Alternator and Fan Belt Tension
Belt Type Belt Size New Belt
Tension
Used Belt
Tension
with fewer
than 10
Hours in
Operation
Reset Belt
Tension
Alternator
belt
10 mm
(0.39370
inch)
645 ± 44
N
(145 ± 10
lb)
512 ± 44
N
(115 ± 10.
lb)
311 ± 44
N
(70 ± 10
lb)
Fan Belt 5V/5VX
15 mm
(0.59055
inch)
801 ± 44
N
(180 ± 10
lb)
645 ± 44
N
(145 ± 10
lb)
378 ± 44
N
(85 ± 10
lb)
Note: Do not set the belt tension when the belts are
hot.
i06942621
Belts - Inspect/Replace
(General Information for Poly
Vee Belts)
The polly vee belt may also be called the micro rib
belt.
M0076814-03 83
Maintenance Section
Belts - Inspect/Replace
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