Komatsu WB93R-5, Operation & Maintenance Manual

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BACKHOE TELESCOPIC ARM
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6.5 BACKHOE TELESCOPIC ARM
6.5.1 DESCRIPTION AND CONTROL
The telescopic arm makes it possible to work with the equip-
ment installed at a variable distance that is greater than that
allowed by the standard arm.
When the telescopic arm is completely extended, the breakout
force at the bucket pin is reduced and only lighter loads can be
lifted; therefore, suitable buckets must be used (see "6.1 AU-
THORIZED OPTIONAL EQUIPMENT").
This structure features an external hollow arm (1) inside which
the arm (2) that supports the equipment slides on adjustable
“V”-shaped guides.
The sliding of the arm is achieved by means of a double-acting
cylinder controlled by an additional distributor.
6.5.1.1 CONTROL (version with mechanically-
controlled backhoe)
The distributor that manages the telescopic movement is con-
trolled by means of a pedal (3) positioned on the right side of
the backhoe control lever unit; the movements of the levers
described in "3.3.6.1 pos. 18/19 - BACKHOE CONTROL LE-
VERS (version with mechanical controls)" remain unchanged.
The movements of the telescopic arm are as follows:
1 - Extension of the arm, obtained by pressing the pedal (3)
with the toe.
2 - Retraction of the arm, obtained by pressing the pedal (3)
with the heel.
6.5.1.2 CONTROL
(version with servo-assisted backhoe)
In the version with servo controls, the movement of the tele-
scopic arm is achieved via the buttons (4) and (5) positioned
on the right joystick lever.
The movements of the main equipment remain unchanged;
see "3.3.6.1 pos. 18/19 - BACKHOE CONTROL LEVERS
(version with servo controls)".
The movements of the telescopic arm are as follows:
1 - Retraction of the arm, obtained by pressing the push but-
ton (4); the arm stops when the button is released.
2 - Extension of the arm, obtained by pressing the push but-
ton (5); the arm stops when the button is released.
IMPORTANT
q
The telescopic arm controls are inhibited when the safe-
ty button (A) is in locking position (see "3.3.2 pos. 12 -
SERVO CONTROL LOCKING BUTTON").
1
RKA15530
2
RKA14370
3
RKA14380
4
5
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