Isuzu Tilt Slide FYJ2000 Instruction Manual page 364

7-36
SERVICE AND MAINTENANCE
Engine model
With 50/60A alternator
With 90A alternator
Adjusting the Fan Belt
1. Loosen the mounting bolts and nuts at
2. Turn the adjusting bolt until the belt
3. After adjustment, firmly tighten the
Check to see if the deflection of the belt is
within the standard value when its center
part between the generator pulley and
the idler pulley is pressed with a force of
approx. 98 N (10.0 kgf/22 lb).
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.
Fan belt
Degree of deflection
New belt 6 - 7 mm (0.24 - 0.28 in)
When reused 8 - 9 mm (0.31 - 0.35 in)
New belt 6 - 7 mm (0.24 - 0.28 in)
When reused 8 - 9 mm (0.31 - 0.35 in)
the top and bottom of the generator.
tension is within the standard value
range.
loosened bolt and nuts.
Standard values
Vibration frequency
178 - 198 Hz
151 - 163 Hz
174 - 194 Hz
148 - 160 Hz