Figure 2--3. No--Load Test Circuit

TM 9- 2920- 232- 34&P / TO 38X14- 2- 32

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TROUBLESHOOTING INSTRUCTIONS - CONTINUED

0005 00

3) No--Load Speed and Current. Connect starter to power supply with circuit equivalent to Figure 2--3. When

the switch is closed, the armature should rotate at 5500 to 7500 rpm and current should be in the range of

95A to 120A when applied voltage is at least 20 VDC.

NOTE

Voltage higher than 20 VDC will cause higher rpm in cause a

starter, but current draw will remain about the same because

counter--electromotive force (CEMF) will increase.

4) Brush Lead Tightening. Low speed and low current are a symptom of high internal resistance which may

be caused by loose attaching screws for brush leads. Torque loose brush lead screws as shown in Figure

2--4 to 18--24 lb--in (2.0 to 2.7 NSm).

Figure 2--3. No--Load Test Circuit

Figure 2--4. Brush Lead Tightening

0005 00- 2