Page 167 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 9.3: Overhaul the Axial starting motor

Objectives

At the end of this exercise you shall be able to
• remove the starter motor
• dismantle the starter motor
• test solenoid switch
• test the armature and commutator
• check continuity of field coils
• check clutch plates
• check end cover’s shaft bushes
• assemble starter motor
• test the starter motor for performance
• fit the starter motor on the engine.

Requirements

Tools / Instruments • Face plate for rebushing drive

• Trainees tool kit - 1 Set and shield - 1 No.
• Multimeter - 1 No. • Dolly for pressing clutch housing - 1 No.
• Box spanner set - 1 No. Equipments/Machines
Machines • Heavy motor vehicle - 1 No.
• Axial starter - 1 No.
• Growler - 1 No. Materials
• Arbor press - 1 No. • Tray - as reqd.
• Starter test bench - 1 No. • Cotton cloth - as reqd.
• Axial starter servicing special tools - 1 Set • Kerosene - as reqd.
• Plunger nut spanner - 1 No. • Diesel - as reqd.
• Plunger nut (inner) spanner - 1 No. • Soap Oil - as reqd.
• Extractor clutch outer race - 1 No. • Engine Oil - as reqd.
• Socket for checking clutch torque - 1 No. • Coolant - as reqd.

Procedure

Servicing
1 Disconnect the Battery negative lead
2 Remove the battery solenoid, Positive and Negative cable connections to the starter motor.
3 Remove the starter motor flange bolts and take out the starter

Dismantling
1 Unscrew nuts (25) and take off commutator cover (21)
2 Unscrew brush lead screws, lift brush spring (31) and remove brushes (30) from their holders. It will be
seen that removal of the brush lead screw also frees the auxiliary field connections to the brush gear.

Note: At this stage, the leads to the rush gear and solenoid switch (15) should be marked so
that they can easily be identified when the starter is reassembled.

3 Remove nut (26) in the commutator end shield (13) from the armature plunger (28) using a box spanner.
4 Remove main fixing bolts, (5) tap drive end shield (40) gently away from yoke (34) with hide of wooden
mallet, and withdraw end shield complete with armature (8)

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