BI001467
Replacement of wear parts _________________________________________ Head shaft sprockets The head shaft sprockets transmit the torque of the hydraulic motor to the conveyor chain assembly and are part of the headshaft assembly. As soon as the sprockets are worn, they must be replaced. Due to the high abrasion forces the chain sprockets are subject to a very high level of wear. How to remove the head shaft sprockets Note: If replacing one piece sprockets with split sprockets, torch the old sprockets off of the shaft and then follow Split sprocket installation procedure. To remove the sprockets from the head shaft assembly (Fig. 70): 1. Remove the headshaft assembly from the feeder (see Headshaft removal in this chapter). 2. Remove the two (2) bearings from the headshaft. 3. Remove the two (2) set screws from each sprocket (it may be necessary to apply heat to loosen Loctite). 4. Slide both sprockets from the drive shaft. 5. Remove old keys. 6. Inspect all components of the drive shaft for wear and damage. See the Cat® parts manual for your machine for a replacement parts list. How to install the head shaft sprockets To install the sprockets on the head shaft (Fig. 70): 1. Thoroughly clean and lubricate the drive shaft with Spec. 100-3 grease. 2. Insert one of the keys into the shaft keyway and slide first sprocket onto shaft (see Fig. 69 for location). It is customer preference on whether to weld the sprocket in place or not. See Fig. 69 for weld specifications. Apply Loctite 242 (blue) to screws and torque to 100 ft-lbs. 3. Insert the other key into the shaft keyway and slide second sprocket onto shaft (see Fig. 69 for location). It is customer preference on whether to weld the sprocket in place or not. See Fig. 68 for weld spcifications. Apply Loctite 242 (blue) to screws and torque to 100 ft-lbs. 4. Install bearings on shaft (ss Bearing installation procedure in this chapter). Note that the bearing housing must be installed on shaft so that the Taconite seal is facing the middle of the shaft. Only one of the bearings must have the internal spacer removed to allow the shaft to float and not be in a bind. 5. Install the drive shaft assembly in the feeder breaker. (See Drive shaft installation in this chapter.)
________________________________________________________________ FB140 (7MFBHM-48DD) Feeder Breaker 5.106
