SLEWING RING 0827764 - Caterpillar

Table 1
Tools Needed    
6V-7070 Digital Multimeter
or Equivalent    
225-8266 Ammeter Tool Gp
(AC/DC Clamp-On Ammeter) or Equivalent    The following procedure is used in order to perform a no load test after the starting motor has been repaired. The no load test should also be performed when the starting motor is removed from the machine. In order to check a starting motor completely, the complete procedure should be followed. The complete procedure is shown in the Initial Troubleshooting Procedure. To check the starting motor components, see Starting Motor Component Tests.
Illustration 1 g00584747
No Load Test Diagram (24 V Shown).
The above illustration shows two batteries (12 V) that are connected to a starting motor. Use one battery for a 12 V system. Connect the positive battery cable to the Battery terminal of the starting motor solenoid. Connect the negative battery cable to the starting motor negative terminal.
As shown, connect an open switch between the S terminal and the BAT terminal of the solenoid.
Connect the multimeter red lead to the solenoid motor terminal. Connect the black lead to the starting motor negative terminal.
Use an rpm indicator or photo tachometer in order to measure the speed of the armature.
Close the switch. The specifications section provides the table for the maximum current draw. The specification section also provides the table for minimum voltages.
If the voltage is below the minimum, the batteries are low and the batteries needs charged. If the voltage is higher, the speed will be proportionally higher. Possible No Load Test ResultsThe following information provides some no load test results that could be seen and corresponding possible problems.
Achieving the rated current draw at a no load speed condition indicates a normal starting motor.
A low free speed and a