RESERVOIR A. 0321505 - Caterpillar

Illustration 21 g01225754
Electrical connections for pinion adjustmentNote: Do not continue the test for more than 20 seconds in order to prevent the windings on the solenoid switch assembly from overheating.
Connect a battery that has the same voltage as the solenoid assembly to the "S" terminal. Connect a battery, that has the same voltage as the solenoid assembly to the front housing of the starting motor. This will cause the pinion to move to the cranking position and this will cause the pinion to rotate.
Disconnect the cable from the "M" terminal in order to stop the pinion from rotating. The pinion will remain in the cranking position.
Illustration 22 g01225365
Adjustment of the pinion gap (Z) Pinion gap
Lightly push the pinion toward the armature.
Measure the pinion gap (Z).
Add the packing or remove the packing on the solenoid switch assembly in order to adjust the gap (Z). Adding the packing will decrease the gap.
Table 8
Pinion Gap    
Engine Model     Standard    
3046    
0.5 to 20.0 mm (0.020 to 0.079 inch)    
3046
3066    Testing No Load
Illustration 23 g00584747
No load test diagram24 volt shownNote: The multimeter must be set to the voltage specifications that are listed in table 9.Note: The ammeter must have sufficient capacity in order to exceed the specifications in table 9.Note: All connections must have sufficient capacity in order to exceed the specifications in table 9. All connections must be secure and tight.
Use protective jaws and clamp the starting motor securely in a bench vise. Do not damage the starting motor.
The above illustration shows two batteries (12 volt) that are connected to a starting motor. Use one battery for a 12 volt system. Connect the positive battery cable to the Battery terminal of the starting motor solenoid. Connect the negative battery cable to the front housing of the starting motor.
As shown, connect an open switch between the "S" terminal and the "B" terminal of the solenoid.
Connect the positive lead of the multimeter to the "M" terminal on the solenoid. Connect the negative lead of the multimeter to the front housing of the starting motor.
Use an rpm indicator or photo tach in order to measure the speed of the armature.
Close the switch.
Compare the voltage, the amperage and speed (revolutions per minute) to the specifications.
Table 9
No Load Test    
Engine Model     Size     Voltage     Amperage     Speed (rpm)    
3046     12 Volt
2.2 kW     11     130 or less     3800 or more    
12 Volt
3 kw 11     130 or less     3800 or more    
3064
3066     -     23     85     3300    No Load Test Results
The following information provides some results of the load test that could be seen and corresponding possible problems.
Achieving the rated current draw at the speed of the load test indicates a normal starting motor.
A low free speed and a high current draw indicates:
An increase in friction could be caused by tight bearings, dirty bearings, or worn bearings. A bent armature or loose field pole shoes that would allow the armature