Isuzu Tilt Slide FYJ2000 Instruction Manual page 363

Engine model
With 50/60A alternator
With 90A alternator
SERVICE AND MAINTENANCE
Inspecting the Fan Belt
Press the center of the span between
pulleys (see the figure) of the belt with a
force of 98 N (10.0 kgf/22 lb) and check
the amount of deflection. The amount of
deflection must fall within the standard
value range indicated below. Otherwise,
adjust the tension or replace the belt.
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)
Standard values
Vibration frequency
178 - 198 Hz
151 - 163 Hz
174 - 194 Hz
148 - 160 Hz
7-35