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01 - 4 RT55 Rough Terrain Crane

1.7 SET-UP

1.7.1. Crane load ratings are based on the crane being leveled and standing on a firm

and uniform supporting surface.

1.7.2. Crane load ratings on outriggers are

based on all outrigger beams being

fully extended / retracted, or in the

case of partial extension ratings

mechanically pinned in the

appropriate position, and the tires

raised free of the supporting surface.

1.7.3. Crane load ratings on tires depend on appropriate inflation pressure and the tire

conditions. Caution must be exercised when increasing air pressures in tires.

Consult Operator’s Manual for precautions.

1.7.4. Consult appropriate section of the Operator’s Manual for more exact description of

hoist line reeving.

1.7.5. The use of more parts of line than required by the load may result in having

insufficient rope to allow the hook block to reach the ground.

1.7.6. Properly maintained wire rope is essential for safe crane operation. Consult

Operator’s Manual for proper maintenance and inspection requirements.

1.7.7. When spin-resistant wire rope is used, the allowable rope loading shall be the

breaking strength divided by five (5), unless otherwise specified by the wire rope

manufacturer.

1.8 OPERATION

1.8.1. CRANE LOAD RATINGS MUST NOT BE EXCEEDED. DO NOT ATTEMPT TO TIP

THE CRANE TO DETERMINE ALLOWABLE LOADS.

1.8.2. When either radius or boom length, or both, are between listed values, the smaller

of the two listed load ratings shall be used.

1.8.3. Do not operate at longer radii than those listed on the applicable Lift Chart (cross

hatched areas shown on range diagrams) as tipping can occur without

a load on the hook.

1.8.4. The boom angles shown on the Lift Charts give an approximation of the operating

radius for a specified boom length. The boom angle, before loading, should be

Zoomlion RT55 User Manual

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