Hydraulic Tool Operation. (Cont)

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.

NOTE

Bite or width of broken material will vary with strength and thickness of material and

amount of reinforcement wire or rebar.

Harder material and more reinforcement wire or rebar will require smaller bits. To

determine most effective bit, start with 2-in. (50-mm) or smaller bits.

Corners will require smaller bits because of greater support by surrounding material.

When too large a bite is taken, sticking of steel occurs; steel drills into material and

shank becomes trapped by surrounding material.

(a) Remove breaker from hydraulic accessory box.

(b) Install appropriate bits for the job.

(d) Energize tool circuit.

(e) Place bit firmly on surface to be worked.

(f) Squeeze trigger to start breaker. Adequate downward pressure is very important. When point breaks

through obstruction, or becomes bound, release trigger and reposition bit on material.

(g) To start an opening, break an opening (hole) in center of surface. Once hole is started, crack portions of

material into original opening. If breaker bit is used in spiral pattern around original hole, progress will be

faster because breaking off edges requires smaller bites.

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