3TNM72 Starter Motor Assy For Excavator PC30 119125 - 77010 119125
- 77011 12V
Specification
| Part Name: Starter motor assy | Part Code: 119125 - 77011 |
| Category: Spare parts | Cylinders Number: 3 |
| Application: Excavator engine | Test staus: Normal |
| Type: Eddy Injection | Industrial Engine: 3TNM72 |
| Voltage: 12V | |
Description
What is a Starter Motor?
What are the symptoms of a bad starter motor: When starting a car
with a fully charged battery, there is a single click or nothing
happens at all. The starter motor doesn't run, even though there is
a 12-Volt power at the starter control terminal.
Another symptom is when the starter motor runs, but fails to turn
over the engine. Often, this might cause a loud screeching noise
when starting the car. Of course, this could also be caused by
damaged teeth on the ring gear of the flex plate or flywheel.
Starter solenoid
Starter solenoidStarter solenoid.A typical starter solenoid has one
small connector for the starter control wire (the white connector
in the photo) and two large terminals: one for the positive battery
cable and the other for the thick wire that powers the starter
motor itself.
The starter solenoid works as a powerful electric relay. When
activated, through the control terminal, the solenoid closes the
hi-current electric circuit and sends the battery power to the
starter motor. At the same time, the starter solenoid pushes the
starter gear forward to mesh with the ring gear of the engine
flexplate or flywheel.
How the starting system works:
When you turn the ignition key to the START position, or press the
START button, if the transmission is in Park or Neutral, the
battery voltage goes through the starter control circuit and
activates the starter solenoid. The starter solenoid powers the
starter motor. At the same time, the starter solenoid pushes the
starter gear forward to mesh it with the engine flywheel (flexplate
in an automatic transmission). The flywheel is attached to the
engine crankshaft. The starter motor spins, turning over the engine
crankshaft allowing the engine to start. In cars with a push button
start, the system disengages the starter as soon as the engine
starts running.
