Isuzu Q Series User Manual

SERVICE AND MAINTENANCE
- 5–8 -
Fan belt
Press the center of the span between pulleys (see the figure) of the belt with a force of
10.0 kgf (22 lb/98 N) and check the amount of deflection. The amount of deflection must
fall within the standard value range indicated below. Otherwise, adjust the tension.
When inspecting by vibration frequency, place and hold the sensor mike surface parallel
to the belt 10 mm (0.39 in) from the center of the span between pulleys (indicated by the
arrow) and tap the belt with a handle of screwdriver etc. to make the belt vibrated and
measure the value. Measure the value 2 or 3 times and calculate the average value.
The average value must be within the standard value range indicated below. Otherwise,
adjust the tension.
Also check the belt for cracks or other damage. If there are cracks or damage or if the
inspected value is not within the standard value range, replace the belt. Have adjustment
and replacement of the fan belt performed at an Isuzu Dealer.
Belt types
Amount of deflection
mm (in)
Vibration frequency
Hz
Power steering
pump drive belt
New belt 8.0 - 12.0 (0.31 - 0.47) 135 - 165
When reused 11.0 - 13.0 (0.43 - 0.51) 117 - 135
Generator drive belt
New belt 7.0 - 9.0 (0.28 - 0.35) 133 - 157
When reused 9.0 - 11.0 (0.35 - 0.43) 112 - 126
Generator drive
belt
Amount
of
deflection
Power steering
pump drive belt
Amount
of
deflection
CAUTION
Insufficient tension will result
in battery discharge or engine
overheating, whereas excessive
tension could cause damage to the
generator or V belt.
Check the fan belt without fail. If the
fan belt breaks, the brake booster will
not operate.
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Isuzu Q Series Specifications

General

Brand	Isuzu
Model	Q Series
Category	Utility Vehicle
Language	English