Test the Reversing Contactor
Ensure that all electrical power to the dryer is shut off and disconnected before
proceeding. The circuit breaker box should be locked by personnel following this
procedure. Serious injury or death can result from electrocution if proper safety
precautions are not observed.
The reversing contactor is made up of two separate contactors that must be tested
1. Disconnect power.
2. Remove screws retaining contactor box cover, and remove cover.
3. Locate the forward (Figure 2, Item 5) and reverse contactor (Figure 2, Item 6) on the reversing
contactor (Figure 2, Item 7).
Use extreme caution when testing live electrical components. Serious injury or death can
result from electrocution if proper safety precautions are not observed.
Ensure the dryer is operating in reversing mode.
Refer to TM 10-3510-226-10 for
4. Connect power and operate dryer.
The contactors will switch on and off during operation. If no load voltage is found on one
contactor, check the other.
5. Check for 210 VAC across primary terminals L1, L2, and L3 (Figure 2, Item 2) on either the
forward or reverse contactor. If no voltage is present, refer to WP 0010 for dryer
6. Use a voltmeter to check for 210 VAC across secondary terminals T1, T2, and T3 (Figure 2,
Item 3) on either the forward or reverse contactor.
7. Perform steps 5 and 6 on the remaining contactor.
8. Disconnect power at the dryer circuit breaker.