Hitachi ZAXIS 135US-5B Operator's Manual page 379

Inspect belt, check and adjust tension
--- every 250 hours
Visually check the compressor and fan belts for wear.
Check fan belt tension by depressing the midpoint of the
belt with the thumb. Deflection must be shown in the right
figure with a depressing force of approximately 98 N (10
kgf ).
If cool air does not come out, or any other abnormalities are
found in air conditioner system, see your authorized dealer
for inspection.
Adjust Compressor Belt Tension
1. Loosen bolt (2) of tension pulley (1).
2. Move the tension pulley by adjusting bolt (3) under
tension pulley (1) until tension is correct.
3. Securely tighten bolt (2) of tension pulley (1).
4. Securely tighten adjusting bolt (3).
IMPORTANT: When a new belt is installed, be sure to re-
adjust the tension after operating the engine for 3 to 5
minutes at slow idle speed to be sure that the new belt
is seated correctly.
MAINTENANCE
Fan Pulley
Crank Pulley
Alternator Pulley
2
1
Air Compressor Pulley
7-105
Tension Pulley
14.6 to 16.4 mm
98 N (10 kgf)
ZX135US-5B
Fan Pulley
Crank Pulley
10 to 14 mm
98 N (10 kgf)
ZX225US-5B, 225USLC-5B
ZX135US-5B
1
2
3
Air Compressor Pulley
ZX225US-5B, 225USLC-5B
Compressor Pulley
M1U1-07-086
17 to 21 mm
98 N (10 kgf)
Air Compressor
Pulley
M1GR-07-007
3
M1U4-07-041
M1G6-07-013