MIRROR AS 5588103 - Caterpillar

Gap of Pinion
Illustration 1 g00570128
Check the gap of the pinion. (1) "S" terminal (2) "M" terminalNote: Do not continue to test for more than 20 seconds in order to prevent the windings on the magnetic switch from overheating.
Connect the electric starting motor to a 24 volt battery, as shown. The pinion will shift into the cranking position and the pinion will start turning slowly. Disconnect the lead of the jumper from the "M" terminal of the starting motor. The pinion will remain in the cranking position.
Illustration 2 g00835755
Pinion clearance (3) Packing (4) Pinion clearance
Push the pinion toward the armature and measure the amount of movement (gap) of the pinion.
Illustration 3 g00835760
Pinion clearance (4) Pinion clearance
Add the packing or remove the packing on the magnetic switch in order to adjust the gap of the pinion. Adding the packing will decrease the gap.
Table 1
    Standard At Assembly    
Gap of Pinion    
0.5 to 2.0 mm (0.020 to 0.079 inch)