Starting Motor - Doosan DX140R Shop Manual

Starting Motor

Rotation Check
If the starter solenoid is making a sound but the engine is not
rotating, turn the keyswitch to the OFF position, and attempt to
bar the crankshaft in both directions.
Bar the engine using the barring tool, Part Number 3824591.
If the crankshaft will bar over, attempt to start the engine. If the
starter motor cranks the engine, check the starter motor pinion
gear and flywheel ring gear for damage.
If damage to the starter motor pinion gear and/or flywheel ring
gear is found when replacing the components, make sure to
measure the distance from the starting motor mounting flange to
the forward face of the front side of the flywheel ring gear. Follow
the measure step of this procedure.
If the crankshaft does not rotate or requires more than the
normal effort to bar, check for an internal malfunction or a
problem with the drive unit and/or accessories.
If the engine cranking speed is too slow/will not crank at all and
the engine rotates freely:
Make sure the wiring connections are clean, tight and not
damaged.
Check the battery voltage. Refer to the OEM service manual
and/or manufacturer for specifications.
Check the voltage at the starting motor during cranking. If the
voltage drops more than 2.4 VDC on a 12-VDC system and 4.8
VDC on a 24-VDC system, check that all connections are clean
and tight.
If the cables are correct and the voltage drop exceeds the limit,
replace the starting motor.
QSB4.5 Engine
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