Drilling with Hammer Drill (SEE).

TM 5-2420-224-10

CAUTION

Hydraulic tools switch must be in off position when coupling or uncoupling hydraulic

tools. Failure to do so will result in damage to quick-disconnect couplers and

overheating of hydraulic system.

If hydraulic hand tools are to be in operation during winter, couple two auxiliary hose

reel ends together to preheat hoses and hydraulic oil and prevent equipment

damage.

(a) Remove hammer drill from hydraulic accessory box.

(b) Install appropriate drill bit for job.

(d) Energize tool circuit.

(e) Select hammer drill rotational direction and speed using rotational direction lever (2) on lower section of

drill. Drill is in neutral when lever is vertical. Drill turns at maximum speed in either forward or reverse

direction. Drill turns at proportional rate in either direction when lever is in intermediate position.

(f) Grip drill firmly with both hands.

(g) Place drill firmly on surface to be worked.

(h) Place rotational direction lever (2) to intermediate or full-on position. Squeeze trigger to start drill while

applying downward pressure. Squeezing trigger causes hammering action as well as drill bit rotation.

(i) Periodically pull bit out of hole while rotating to clear hole and allow better penetration.

(j) If drill binds, reverse direction of drill bit rotation.

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