BI001467
________________________________________ Replacement of wear parts How to remove the breaker power unit assembly Whenever performing maintenance procedures, follow all safety regulations and be aware of the following: WARNING! Before performing maintenance on the machine, the circuit breaker must be in the “OFF” position and the power should be disconnected at the main power source. Electrical shock and accidental machine movement can cause serious injuries or even death to you or the maintenance person. WARNING! You could be seriously injured or even killed by falling loads. Observe the safe working load limits of lifting or blocking devices and keep a safe distance from suspended loads. To remove the breaker power unit proceed as follows (Fig. 84). 1. Turn the machine main circuit breaker (CB1) to the “OFF” position. 2. Lock out and tag the power center. Follow standard Federal and mine lockout/tagout procedures. 3. Remove all power unit covers. 4. Remove the junction box access panel of the electric motor. Tag and disconnect the cable leads from the motor leads. 5. Remove and cap all grease lines from the gear reducer and electric motor. 6. Remove the under speed sensor. 7. Attach an appropriate lifting device to the power unit assembly in such a manner as to keep the power unit level during the lift. Take all slack out of the lifting device in order to support the assembly when mounting power unit reaction pin and bolts from breakershaft bolt flange and stub shaft are removed. 8. Remove the twelve (12) one inch socket head sholder bolts, twelve (12) 3/4 inch lock washers, and twelve (12) 3/4 inch hex nuts that connect the breaker shaft bolt flange to the stub shaft. 9. Remove cotter pins from the power unit reaction pin and remove the pin. 10. Disengage the pilot fit (1/8 inch) between the stub shaft and bolt flange before attempting to lift the power unit from the machine. 11. Lift the power unit out of the machine.
______________________________________________________________ A6474X391 REV 4 5.141
