Backhoe Telescopic Arm - Komatsu WB93S-5 F50003 Operation & Maintenance Manual

BACKHOE TELESCOPIC ARM

6.5 BACKHOE TELESCOPIC ARM
6.5.1 DESCRIPTION AND CONTROL
The telescopic arm makes it possible to work with the equipment
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
AUTHORIZED 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
controlled 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
LEVERS (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 telescopic
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. 19/20 - 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 button
(4); the arm stops when the button is released.
2 - Extension of the arm, obtained by pressing the push button
(5); the arm stops when the button is released.
IMPORTANT
The telescopic arm controls are inhibited when the safety
q
button (A) is in locking position (see "3.3.2
SERVO CONTROL LOCKING BUTTON").
256
pos. 19/20 - BACKHOE CONTROL
3
pos. 12 -
1
2
4
5
RKA15530
RKA14370
RKA14380