4-20
[ADJUSTMENT OF BOOM TELESCOPING WIRE ROPE]
CAUTION
The wire ropes must be adjusted to the correct tightness.
A boom extending wire rope (1 piece) and retracting wire rope (1 piece) are used in this machine.
Adjustment of these wire ropes must conform to the specified procedure. Use the following procedure for
wire rope adjustment.
1. With the booms retracted in a horizontal position, extend the telescoping booms approx. 2m.
2. Retract the booms completely. Slow boom retraction is required.
Measure clearance (a) to check the following for proper
adjustment.
• If 5mm or more clearance is formed, adjust the retracting wire
rope (5) of boom No.5.
• If no clearance is formed, perform wire rope adjustment from
section 5 “Adjustment of boom No.5 extending wire rope (8)”.
3. Remove the three mounting bolts (1) at the boom end and
remove the cover (2).
If sag is developed in the wire rope, adjust the wire rope
according to “Adjustment of wire rope".
4. Adjustment of boom No.5 retracting wire rope (5)
(1) With the lock nut (3) loose, turn the adjusting nut (4) in the
direction that the retracting wire rope (5) becomes tight
(clockwise) to provide laterally even tightening until
clearance (a) is bridged.
(2) If the retracting wire rope remains sagging or 5mm or more
clearance remains present after performing steps 1 and 2,
readjustment is required.
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