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Mitsubishi Electric Corporation (MELCO)
Service Bulletin ME003-P
STARTER MOTORS (105P70)
Figure 1 - 105P70 STARTER
A starter is one of the parts installed to the
flywheel housing. MELCO’s 105P70 starter
uses the planetary gear reduction system,
actualizing a compact and high-power
starter. This starter weighs approximately 30
pounds (13.5 kg), extremely lightweight, and
excels in handling.
In addition, this starter uses an overhung
mechanism in the output shaft supporting
structure designated to protect the inner
starter parts from dust or water/oil splash.
1. Principle of operation
* When handling the starting system, be
sure to refer to the wiring diagrams issued
by the vehicle manufacturer to insure an
understanding of the whole starting circuit.
Figure 2 - BASIC STARTING CIRCUIT (GROUND-
FLOAT TYPE)
Figure 2 shows the circuit diagram for the
105P70 Ground-float type (sometimes
referred to as Insulated or Isolated Ground).
The circuit diagram contains a start switch, a
magnetic switch, and a starter solenoid.
When the start switch is closed, the current
flows through the magnetic switch windings.
The magnetic switch contacts are closed,
enabling the current to flow through the
windings in the starter solenoid. The clutch
is thrust forward with the movement of the
plunger and the lever (shown in figures 3),
the pinion starts to rotate slowly by the
above-mentioned current to engage with the
ring gear. When the secure engagement is
made, the main contacts in the starter
solenoid are closed, and cranking takes
place.
When the engine does not start during the
initial cranking attempt, the start switch must
be turned off within 30 seconds to protect
the starter from excessive heat. If the starter
motor is operated continuously for 30
seconds, it is necessary to allow the starter
motor to be cooled off for at least 2 minutes
before the next operation.
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