Dong Feng ZB25, Operator'S Manual, Page: 54 / 112

Factory Direct Tractors
brakes by lengthening the pull rod (8) on the side
with the longest skid mark or shorten the pull rod
on the side with the shortest skid mark and test
again. Repeat the adjustments until the brakes are
synchronised and well balanced.
Eventually the brake pads will wear out and
require replacing. For your safety regularly check
and maintain the brakes to keep them working
well. Don’t wait till the linings are completely
worn out causing damage to other brake system
components.
6.6 Electrical system
The tractor is fitted with a 12V electrical system
and is negative-earth as per standard convention.
6.6.1 Battery
The tractor is equipped with a 6-QA-100S battery.
When the ammeter’s pointer turns towards the
“+”, positive side the battery is charging, and when
ammeter’s pointer turns towards “-”, the negative
side the battery is discharging. The battery is
charging while the tractor is working in normal
conditions.
An AVO meter can be used to check the batteries
charge state. Do not short circuit the battery to
assess its state of charge. A hydrometer can also
be used to check the batteries charge level. Do
not connect positive to the body of the tractor.
The electrolyte level of the battery lies between
the “UPPER” and “LOWER” marks on the battery.
Once it is under the “LOWER” mark, distilled water
should be added.
When the battery is low on charge, the tractor will
be hard or impossible to start. The battery needs
to be charged from an external power source.
Persistently trying to start the engine with a low
charge battery can damage the electrical system
including the starter motor.
Points for attention:
1. When charging the battery, loosen or remove all
battery vent plugs.
2. Make sure that all cells of the battery are
immersed in electrolyte. Add distilled water in a
well-ventilated area as required.
3. When the specific gravity of the electrolyte
becomes 1.28 - 1.29g/cm3, the charging process
has completed. (Using the hydrometer)
4. After charging, let the battery ‘rest’ for at least 40
minutes before putting it into service.
6.6.2 Fuse
Before replacing a blown fuse with a new one of the
same current rating, determine the exact causes of
the failure and make the necessary repairs.
Mechanical Adjustment
Fuse box
Fuse No. Electric circuits to be protected Current rating
1 Main power circuit 30A
2
Oil pressure gauge, Water temp gauge and horn
10A
3 Electronic voltage regulator 5A
4
Headlight, left & right turning indicator lamp
10A
5
Clearance lights, Rear working light, Brake light
10A
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