Hitachi ZAXIS 120-6 class Operator's Manual page 390

Hydraulic excavator

Table of Contents

ZX200-6, 240-6, 300-6, 330-6 class

IMPORTANT: Loose fan belt may result in insufficient

battery charging, engine overheating, as well as

premature belt wear. A belt that is too tight can

damage both water pump/alternator bearings as well

as the belt.

Check fan belt tension by depressing the midpoint between

the fan pulley and the alternator pulley by your thumb

with a depressing force of approximately 98 N (10 kgf ).

Deflection must be within the value illustrated in the right.

Visually check the belt for wear. Replace it if necessary.

Adjust Drive Belt Tension

1. Loosen lock nut (1) at the top of alternator (3), and lock

nut (4) at the bottom of alternator (3).

2. Adjust belt tension by moving alternator (3) forward or

backward by using adjustment bolt (2).

3. Securely tighten lock nuts (1) and (4).

Standard Tightening Torque:

Lock nut (1) : 76 N·m (7.6 kgf·m)

Lock nut (4) : 127 N·m (12.7 kgf·m)

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.

Alternator Pulley

98 N (10 kgf)

ZX200-6, 240-6 class

98 N (10 kgf)

ZX300-6, 330-6 class

Crank Pulley

Crank Pulley

Troubleshooting