TM 5-3820-256-10
(1) Extend the other three jacks in like manner, observing the level both laterally (side-to-side) and longitudinally
(front-to-rear) until rig is level. You can "fine tune" the level by quickly tapping and releasing the controls.
f. Raising the Mast.
WARNING
Electric shock can cause serious injury or death. Never raise the mast
or operate the rig with less than 25 feet working clearance to any electric
power line.
NOTE
Ensure leveling jacks are in position before raising mast.
(1) Raising the mast requires a large volume of hydraulic fluid. Check the hydraulic oil level in the reservoir. Refill
as required.
(2) Make sure all pre-operation checks and services have been performed and the rig has been correctly leveled.
(3) Remove the Retractable life-line from the storage area and attach it to the top of the mast. Perform the "Before"
PMCS for the life line, then extend the cable and attach it to the bottom of the mast.
WARNING
To avoid serious injury to personnel, never work above the
anchorage point. Personnel could fall at least 10 feet before the
locking mechanism engages, causing sudden jerking to back and
neck.
Never connect more than one person at a time to the life-line cable.
Unit must be removed from service if a fall has taken place. Unit
must be kept out of service until it has been inspected and
recertified by manufacturer. If any device is suspected to have
damage, it should be immediately removed from service until it has
been recertified by the manufacturer.
(4) When necessary to climb the mast, put on the safety harness/belt with the 6-foot lanyard attached. Remove the
life-line cable from the bottom of the mast and attach it to the D-ring on the safety harness/belt.
NOTE
On chest harnesses and Fully Safety harnesses, attach to the rear D-
ring.
On belts, attach to one of the side D-rings, then rotate the belt around
the waist until the attachment point is at the center of the back.
(5) Check that there are no obstructions that would interfere with the mast as it moves to the raised position.
(6) Open the mast locks at the rear of the drill frame, on either side of the rotary table.
(7) Move the mast control (1, figure 2-1) to the UP position and raise the mast about 1 foot. Then move the control
to the down position and lower the mast onto the mast support.
(8) Repeat Step 7 two or three times to make sure that the mast cylinders are full of hydraulic oil.
WARNING
Before raising the mast, alert all personnel in the immediate area to be
aware of the operation and to stand dear of the drilling rig during the
procedure in event a malfunction should occur. NO maintenance or
repair may be attempted during the mast-raising operation.
(9) Operate the mast control (1, figure 2-1) and raise the mast approximately one-third of the fully raised position.
Release the control to stop movement.
CAUTION
Do not leave the mast in a partially-raised condition. This causes
internal cylinder strain far beyond the cylinder's capacity.
Change 5 2-49
