82E-5 – 98E-5 SERIES 11-5
11. ELECTRIC WIRING
11.2.2 Starting motor
In the cases listed below the warranty shall not be deemed to apply. Please be sure to read these conditions
carefully when planning to use it with other equipment. Also be certain to give appropriate guidance on usage to
the user.
(1) Starting performance in the case of using an untested battery
The starting performance of the engine is closely dependent on the battery capacity. This battery capacity is
itself affected by the climate and the type of equipment installation. Confer with Komatsu in advance after
checking these conditions and fix the battery capacity on the basis of confirmatory tests.
(2) When the resistance of the battery cable exceeds the specified value
The combined total resistance of the battery cable in both directions between the starting motor and battery
should be within the value indicated on the wiring diagram. The starting motor will malfunction or break
down if the resistance is higher than the specified value.
(3) When the resistance of the starting circuit exceeds the specified value
The combined total resistance of the wiring between the starting motor and key switch (or power relay or
safety relay, depending on the application) should be within the value indicated on the wiring diagram.
Engine starting will be difficult if the resistance is higher than the specified value. This can also cause weld-
ing of the magnet switch at the point of contact and resultant burning of the armature coil.
(4) When there is no safety relay
Over-running (when the electric current flows for too long) is a major cause of starting failure. This burns the
armature coil and causes clutch failure. Excessive work and failure of the key switch to return properly are
the main causes of over-running. The user must be given sufficient warning about this.
Be sure to use the safety relay to prevent over-running. This safety relay is supplied as an option. Consult
Komatsu first when planning to install a safety relay at your own. In the case of failure to consult with
Komatsu, our warranty will not be applied to all the electrical equipment.
(5) When there is too much rust due to the entry of water
The water-proofing of the starting motor is equivalent to R2 of JIS D 0203. This guarantees that there will be
no damage from the sort of exposure encountered in rain or when water is poured on from a bucket. You
should, however, avoid the use of high-pressure washing and steeping in water.
(6) Regarding the heat resistance of the starting motor
The starting motor has heat resistance for an ambient temperature of 80°C and surface temperature of
100°C. Insulators must be installed to prevent overheating when used near high temperature parts such as
the exhaust system.
(7) Corrosion of magnet switch contact point by corrosive gas.
When using equipment with a dry clutch, ammonium gas generated by friction is liable to corrode the con-
tact of the magnet switch. Be sure to install a vent in the clutch case.
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