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Tailpiece installation.....................................................5
How to disassemble the breaker power unit
To disassemble the breaker power unit (Fig. 92):
1. Remove the power unit from the machine (see power unit removal procedure in this section). While it is not necessary to remove the breaker shaft with the power unit, this procedure will include removing the breaker shaft from the power unit.
2. Attach an appropriate lifting device to the breaker shaft (if attached) and remove the bolts, lock washers, and nuts from the coupling flange and stube shaft.
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.
IMPORTANT! Bucyrus America, Inc. does not recommend field disassembly or repair of the breaker shaft. If the breaker shaft requires repair, please consult your Bucyrus America, Inc. service representative.
3. Remove the low speed output shaft cover bolts and the cover.
4. Remove the M30 hex head cap screw from the stub shaft.
5. Insert a hex head cap screw into the threaded hole in the gear reducer retainer plate. As the bolt is threade into the hole, it will push the stub shaft out of the hollow bore of the reducer.
6. Install a lifting eye into the top of the electric motor.
7. Attach an appropriate lifting device to the electric motor.
8. Remove the connecting tube access cover.
9. Remove the bolts that attach the magnetic coupling to the shrink disc on the motor shaft.
10. Loosen the bolts that secure the shrink disc to the electric motor shaft.
11. Using a gear puller, a brass hammer, or a hammer and piece of wood, carefully remove the shrink disc from the electric motor shaft.
12. Securely block the magnetic coupling so that it will not move when it is disconnected from the connecting tube.
13. Remove the bolts that secure the shrink disc on the gear reducer shaft.
14. Attach a lifting device to the magentic coupling and remove from the connecting tube.
15. Attach a lifting device to the connecting tube and take up the slack so that the weight of the connecting tube is resting on the lifting device.
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.
16. Remove the bolts that secure the connecting tube to the gear reducer and lift the connecting tube out of the frame.
17. Using a gear puller, a brass hammer, or a hammer and piece of wood, carefully remove the shrink disc from the gear reducer.
How to assemble the breaker power unit
To assemble the breaker power unit (Fig. 92):
1. Attach a lifting device to the connecting tube and position the connecting tube so that it can be bolted to the gear reducer.
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.
2. Secure the connecting tube to the gear reducer with four bolts.
3. Attach a lifting device to the magentic coupling and position the coupling in the connecting tube.
4. Bolt the shrink disc on the gear reducer.
5. Secure the shrink disc to the electric motor shaft.
6. Secure the electric motor to the connecting tube with eight bolts and lock washers.
7. Replace the the connecting tube access cover.
8. Install the stub shaft into the hollow bore of the gear reducer.
9. Install an M30 hex head cap screw into the end of the stub shaft.
10. Install the low speed output shaft cover and bolts.
11. Attach an appropriate lfiting device to the breaker shaft (if removed with power unit) and secure the coupling flange to the stub shaft with bolts, lock washers, and nuts.
12. Install the assembled power unit into the machine (see Power unit installation procedure in this chapter).
Fig. 93: Breaker shaft and power unit installation
Breaker shaft
Breaker power unit
To adjust the height of the breaker shaft and power unit:
1. Remove covers to gain access to both ends of the breaker shaft and power unit.
2. Remove all breaker shaft side plate and reaction pivot mount hardware.
3. Loosen only, do not remove, the retainers located on the reaction pivot mount.
4. Locate the grease cylinder manifold on the feeder frame rear pivot mount.
To lower:
5. To lower the breaker shaft and power unit, make sure grease needle valve openings are pointed away from people and slowly crack open one at a time.
6. Incrementally and evenly lower the breaker shaft and power unit to the desired height and close the needle valves.
7. Install all hardware, tighten the retainer hardware on the reaction pivot mount, and install all covers.
