BACKHOE TELESCOPIC ARM 6.5 BACKHOE TELESCOPIC ARM 6.5.1 DESCRIPTION AND CONTROL 1 This version of the backhoe arm makes it possible to work with the equipment installed at a variable distance that is greater than that ensured by the standard arm. With the application of this arm (and with extended arm), the breakout force at the bucket pin is reduced and lighter loads can be lifted; therefore, it is necessary to install a suitable bucket (See “6.1 AUTHORIZED OPTIONAL EQUIPMENT”). This structure comprises an external hollow arm (1) within which the arm (2) supporting the equipment slides on adjustable “V”- shaped guides.
The sliding is obtained by means of a double-effect cylinder con- trolled by an additional distributor. The distributor control operating the telescopic movement is achieved by means of a pedal (3) positioned on the right side of the backhoe control lever unit; the levers maintain the move- ments described at point “3.3.5 (pos. 15-16) BACKHOE CON- TROL LEVERS” unchanged. The controls that operate the telescopic arm are the following: 2 RWA03550 1 - The arm is extended by pressing the pedal with the toe. 2 - The arm is retracted by pressing the pedal with the heel.
RWA35070 3 6.5.2 SAFETY DEVICES The telescopic arm is provided with a safety pin (4) that locks the extendable arm (2) in completely retracted position and prevents it from being accidentally extendede. The safety pin (4), held in place by the pin (5), must be engaged to lock the extension of the arm in the following situationso: 5 4 1 - When it is necessary to travel on roads or in any case to move the machine for long distancesi. 2 - When the backhoe is not used. In working conditions the pin (4) must be inserted in the hole (6). RWA03570 6 4 RWA03580 224