BI619852
Bucyrus International, Inc. 59HR Blast Hole Drill
Controls for Angle Drilling
4.
Turn the mast brace lock switch to the UNLOCK position to release the mast lock pins, then raise the mast to the vertical position (figure 4-13). Turn the A-frame lock switch to the LOCK position to lock the A-frame front leg. The readout (A-frame Pins Out) on the operator’s display terminal will disappear when the A-frame pins are in the LOCKED position. Now proceed to step 5 to lower the mast.
5.
If the mast lock pins and/or mast brace lock switch have not been released, turn the switches to the UNLOCK position to release the pins. A blinking readout (Mast Pins Out and Mast Brace Pins Out) will appear on the operator’s display terminal when the pins are released.
6.
Slowly lower the mast by lifting and then pulling the joystick to the rear (figure 4-13). As the mast moves away from the vertical position, its speed will increase. Gently reduce the lowering speed by moving the joystick toward neutral. CAUTION:
NOTE:
The joystick should be moved away from and returned to the neutral position very slowly. Sudden starts and stops can be damaging to the mast hydraulic system. Be extremely cautious as the mast approaches the mast rests, as only a slight movement of the control is necessary to cause motion in the mast. Lay the mast in the mast rests gently to prevent damage to the mast or machine house.
Pay close attention to the hoses, wires and cables that run between the mast support and the mast to prevent damage to the machine as the mast is being lowered. Have the helper observe the machine from a safe position on the left side of the machine as the mast is coming down.
NOTE: Do not allow the mast, especially if near horizontal to lower too quickly. Damage may result from the mast hitting the mast rests too hard. 7.
Once the mast is resting in the mast rests, inspect the mast and the mast support to verify that no hoses, wires or cables are kinked or damaged. Repair any damages found immediately.
Manual No. 10836
78
October 2009
