TM 5-3820-256-10
2-10. Drilling System Operating Procedures.
NOTE
These operating procedures assume that the pre-operation procedures
have been completed, the truck engine is started and the power take-off
is engaged. If those steps have not been completed, refer back to the
appropriate paragraphs and complete those steps before continuing.
a.
Drawworks. Move the drawworks power control (1, figure 2-4) to the ON position and hold momentarily to
assure that the power take-off that drives the drawworks is engaged. Release the control.
CAUTION
Spooling cable onto the drawworks drums is a simultaneous operation of
two controls. Keep your hands on both controls (clutch control and
brake) from start of task to completion. NEVER release the brake to
allow "free-spooling" of any drum. Do not allow the blocks to hit the
crown nor the rotary table. Proceed slowly when near the crown or
table.
NOTE
To release a brake, release its ratchet by squeezing it. Then, engage
the clutch control and move the brake control forward at the same time.
Unwind cable by releasing the brake, controlling its speed by
occasionally re-applying the brakes. The speed at which the blocks
travel depends on how much weight it supports. Operate these controls
slowly at first, until you have a "feel" for how fast the blocks travel up
and down the mast. When resetting the brakes, move the brake lever
back until the drum completely stops. Be sure the ratchet locks the
lever in place.
(1) Hoist drum.
NOTE
Be sure the pulldown power control (5, figure 2-9) is off and the pulldown
transmission (3) is set to NEUTRAL before hoisting.
(a) To spool cable onto the hoist drum (kelly), move the clutch control (2) to the left while, at the same time,
releasing the hoist drum brake control (5). When the kelly is at the desired position, set the brake (5) and
move the clutch control (2) to the center (neutral) position.
(b) To spool cable off the hoist drum, release the brakes until the kelly is lowered to the desired position; then
reset the brake (5).
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