Figure 14-9. Solenoid Shift Lever

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Figure 14-8. Pedal Shift Starter

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TM-9-8000 Principles of Automotive Vehicles Manual

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Section II. CONTROL SYSTEMS

TM 9-8000

Figure 14-9. Solenoid Shift Lever

Operation.

(1)

When the starter is not

prevents the engine from driving the starter. When the

pinion is disengaged from the flywheel automatically, it is

operating, the pinion is out of mesh and entirely away

held in this position by a latch until the starter switch is

from the flywheel gear. When the starter switch, which

closed again.

may be foot or hand operated, is closed and the total

available battery voltage is impressed on the starter, the

(2) Advantages. The chief advantages claimed

armature immediately starts to rotate at high speed. The

for this type of starter are listed below.

pinion, being weighted on one side and having internal

screw threads, does not rotate immediately with the shaft

(a) It is simple in construction.

but, because of its inertia, runs forward on the revolving

threaded sleeve until it meets or engages with the

(b)

flywheel gear. If the teeth of the pinion and the flywheel

The mechanism is automatic in

meet instead of engaging, the drive spring allows the

operation, requiring no action by the operator other than

pinion to revolve and forces it into mesh with the

pressing the starter switch.

flywheel. When the pinion gear is engaged fully with the

flywheel gear, the pinion then is driven by the starter

through the compressed drive spring and cranks the

the starter is permitted to pick up speed before the load

engine. The drive spring acts as a cushion while the

is applied.

engine is being cranked against compression. It also

breaks the severity of the shock on the teeth when the

(d) The engine is given a high cranking

gears engage and when the engine kicks back due to

torque immediately, thus requiring little cranking and

ignition. When the engine fires and runs on its own

minimizing the demand on the battery.

power, the flywheel drives the pinion at a higher speed

than does the starter, causing the pinion to turn in the

(3) Disadvantages. The chief disadvantages

opposite direction on the threaded sleeve and

are listed below.

automatically disengages from the flywheel. This

(a) The quick impulse given to the pinion is

likely to cause nicking or breaking of the teeth when

TA233580

14-7