TM 5-3820-256-10
NOTE
An engine at or near operating temperature may be
started with the throttle (7) at IDLE or partial throttle.
(c)
After the engine is running, reduce engine speed to approximately 1000 RPM and allow engine to warm
up three to five minutes before applying a load. During warm-up, observe all gages for proper readings.
CAUTION
Do not increase engine speed until the oil pressure gage
(3, figure 2-11) indicates normal (25-30 PSI). Shut
engine down if oil pressure does not register on the
gage within 20 to 30 seconds after starting.
(6) Set the throttle (7, figure 2-11) to the desired engine rpm. Read the rpm's on the tachometer (4).
d.
Extend rotary table. Remove the jib pins from the rotary table sliding base. Check that there are no obstructions that
would interfere with the tables movement from its retracted position to the extended position. Operate the table
retract control (4, figure 2-8) to the OUT position and extend the table to its extended position; then release the
control. Reinstall jib pins in the rotary table sliding base.
e.
Leveling the riq.
NOTE
Before leveling the rig, sight through the rotary table
opening to see if the rig is positioned correctly over the
hole site. If not, reposition the rig before proceeding.
(1) If terrain or ground conditions dictate, place supporting timbers under the hydraulic jacks. Unsnap the safety
chain that holds each jack in the retracted position.
(2) Check that tachometer indicates the desired rpm's; adjust throttle accordingly. Check that gages--hydraulic
pressure (1, figure 2-12) and oil temperature (2) indicate within prescribed operating ranges.
(3) Observe the level gage on frame near jack controls and determine which corner of the drill frame is lowest.
Move the corresponding jack control (3, 4, 5, or 6, figure 2-12) to DOWN and hold until the corner is raised to
approximately level.
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