7 minute read
Crawler assembly ........................................................5
Crawler track
The crawler track (Fig. 85) assembly (left and right) carries the machine via torque received from the tram drive reducer. The crawler track is made up of one basic crawler pad assembly, which repeats sequentially along the entire pad loop. As soon as any component of the crawler track is worn the component or complete crawler track assembly must be replaced.
Each crawler track consists of the following main components:
■ crawler pad
■ connector pin
■ roll pin
Fig. 85: Crawler track main components
Connector pin
Crawler pad Roll pin
How to assemble the crawler track pads (Fig. 85)
To assemble the crawler track pads proceed as follows:
1. Lay crawler track pads on a clean flat surface.
2. Align pads with chain connecting holes centered.
3. Insert connector into center of crawler pad connecting holes.
4. Drive rool pin through connecting pin and bend end to secure.
5. Repeat above procedure for remainder of crawler pads.
How to remove the crawler track pad assembly (Fig. 85)
To remove the crawler track pad assembly proceed as follows:
1. Raise complete crawler assembly off ground and securely block under the machine. The machine must be securely supported off the ground with the crawler free to turn.
WARNING! You could be seriously injured or even killed by falling loads. Observe the safe working load of the lifting devices and keep a safe distance away from suspended loads.
2. Crawler track tension must be released (see Crawler track adjustment in this chapter).
3. Separate the crawler pads (Fig. 85).
IMPORTANT! Heating or cutting connections with a torch or chisel may be required to ease the removal of T- pins.
a. Drive or cut roll pin from crawler pad connection using hammer and punch.
b. Separate crawler track assembly.
c. Connect an additional pulling or lifting device (e.g. winch or lifting tackle with adequate load limit) to either end of the crawler track assembly and slowly pull the crawler track completely out from under the machine.
WARNING! When using an additional pulling device for pulling the crawler track, the connection could fracture under the load. You could be seriously injured or killed by the recoiling chain or cable. Use only approved lifting equipment for connecting pulling devices to the crawler track.
4. Inspect the crawler drive sprocket and idler rollers for wear or damage. Replace if necessary. _________________________________________________________________ 5.112 Bucyrus – Model 7MFBHM-48DD Feeder Breaker
How to install the crawler track pad assembly
To install the crawler track pad assembly proceed as follows (Fig. 85):
1. Remove old crawler track pad assembly (see previous section, How to remove crawler track pad assembly).
WARNING! You could be seriously injured or even killed by falling loads. Observe the safe working load of the lifting devices and keep a safe distance away from suspended loads.
2. Check to ensure that crawler track tension cylinder is completely retracted (see Crawler track adjustment in this chapter).
3. Slide crawler track pad assembly under crawler assembly.
4. Fold pad assembly over both ends of crawler assembly. Ensure that pad assembly meshes with drive sprocket and idler roller.
5. Connect crawler track pad assembly (see How to assemble crawler track pad assembly in this chapter for proper connection).
6. Adjust tension on the crawler track pad assembly (see Crawler track pad adjustment procedure in this chapter for proper adjustment).
Crawler assembly
The crawler assembly (Fig. 86) consists of a take-up assembly and drive assembly that transmits torque to the crawler track via a hydraulic drive motor coupled to the tram drive torque hub. As soon as any component of the drive assembly is worn or damaged, the component must be replaced.
The crawler assembly consists of the following main components:
■ hydraulic drive motor
■ tram drive torque hub
■ cat pad assembly
■ take-up roller assembly
■ grease take-up assembly
■ drive sprocket
Fig. 86: Crawler assembly main components
Crawler pad assembly
Hydraulic motor (not shown)
Take-up roller assembly
Take-up access
Torque hub access Sprocket
How to remove the crawler take-up assembly
To remove the crawler take-up assembly proceed as follows (Fig. 87):
1. Raise complete crawler assembly off ground and securely block under the machine. The machine must be securely supported off the ground with the crawler free to turn.
WARNING! You could be seriously injured or even killed by falling loads. Observe the safe working load of the lifting and blocking devices and keep a safe distance away from suspended loads.
2. Crawler track tension must be released (see Crawler track adjustment in this chapter.
3. Separate the crawler pads (see How to remove the crawler track assembly in this chapter) and fold pads back to clear take-up.
4. Securely block under the crawler frame.
5. Disconnect, tag and cap hydraulic hoses going to the tilt cylinder.
WARNING! Never disconnect a hydraulic hose if the circuit is pressurized or if there is a load on the circuit. If a hose is disconnected while the circuit is pressurized or a load is on the circuit, the load will fall causing damage to the machine or serious injury or death to you or other workers
6. Remove the eight (8) bolts from the tilt cylinder mounting bracket.
7. Swing the tilt cylinder and mounting bracket free of the crawler frame.
8. Connect an additional pulling or lifting device (e.g. winch or lifting tackle with adequate load limit) to the take-up assembly and slowly pull the assembly out of the crawler frame.
WARNING! When using an additional pulling device (e.g. winch or lifting tackle with adequate load limit) for pulling the take-up, the connection could fracture under the load. You could be seriously injured or killed by the recoiling chain or cable. Use only approved lifting equipment for connecting pulling devices to the take-up.
9. Inspect all components for wear or damage.
How to install the crawler take-up assembly
To install the crawler take-up assembly proceed as follows (Fig. 87):
1. Remove old take-up assembly (see previous section, How to remove crawler take-up assembly).
WARNING! You could be seriously injured or even killed by falling loads. Observe the safe working load of the lifting devices and keep a safe distance away from suspended loads.
2. Inspect all components for wear or damage prior to assembly.
3. Clean all dirt and debris from inside crawler frame.
4. Attach appropriate lifting device to take-up assembly and slide assembly completely into the end of crawler frame.
5. Install and connect crawler and track pad assembly, see How to install the crawler track pad assembly in this chapter.
6. Swing the tilt cylinder and mounting bracket into crawler frame and secure with the eight (8) bolts, washers and nuts.
7. Connect hydraulic hoses to tilt cylinder.
8. Purge hydraulic system of air.
9. Adjust crawler track pad tension (see How to adjust crawler track pad tension in this chapter).
Fig. 87: Crawler take-up removal and installation
Tilt cylinder
Crawler take-up Tilt cylinder mounting bracket
How to remove the crawler drive assembly
To remove the crawler drive assembly proceed as follows (Fig. 88):
1. Raise complete crawler assembly off ground and securely block under the machine. The machine must be securely supported off the ground with the crawler free to turn.
WARNING! You could be seriously injured or even killed by falling loads. Observe the safe working load of the lifting devices and keep a safe distance away from suspended loads.
2. Crawler track tension must be released (see Crawler track adjustment in this chapter).
3. Separate the crawler pads (see How to remove the crawler track assembly in this chapter) and fold pads back to clear sprocket.
4. Disconnect, cap and tag all hydraulic hoses to hydraulic motor.
5. Remove slotted nut, roll pin and washer from lift cylinder anchor pin.
6. Remove anchor pin from crawler frame and crawler guide weldment.
7. Remove the six (6) bolts and lock washers that secure the removable side plate to crawler frame and remove side plate.
8. Remove the twelve (12) bolts and lock washers that secure the torque hub to the crawler frame.
9. Attach an appropriate lifting device to the torque hub and slide complete assembly out of crawler frame.
10. Remove the four (4) bolts and lock washers that secure the hydraulic motor and adapter plate to the torque hub.
11. Attach an appropriate lifting device to the torque hub and slide complete assembly out of crawler frame.
CAUTION! Do not bump hydraulic motor or hydraulic motor fittings when removing the motor from the machine.
12. Remove the adapter plate and motor from the torque hub as an assembly.
