Repair Service Manual

REPAIR MANUAL

KUBOTA Z402 and Z602 engines

Adjusting and tuning

The basic adjustments are located on the injection pump or injection pump housing.

1. Engine Stop

2. Min acc. stop

3. Max acc. stop

4. Acceleration lever

5. Idle adjust screw

6. Engine stop lever

7. Max load adjust screw

Idle adjust

Idle adjustment is made from screw 5.

However, idle speed must be reduced by 50 rpm by the min acceleration stop (2) and

compensated with the idle adjust screw (5) to avoid untimely engine stalling.

Load adjust

Max load adjustment is done with screw 7.

However, modifying this adjustment is not authorized. Adjustment of this screw is highly sensitive

and may cause excessive smoke or lack of power. In case of problem linked with this adjustment,

and once all other causes have been eliminated, call after-sales.