-8 Y-8
Operation Check (Crane Operation)
73
WY05-3930E
3. Boom telescoping control
[Boom length: 9.8 - 44.0 m (32.1 - 144.3 ft)]
CN503(1): Emergency telescoping switch for 4th
to top boom sections
CN503(2): Emergency telescoping switch for 2nd
and 3rd boom sections
CN506: Extension switch for 4th to top boom
sections (ISO layout)
CN507: Extension switch for 4th to top boom
sections (TADANO layout)
AML: Telescoping correction switch for 2nd and
3rd boom sections
CN485: Boom/jib operation selection
CN552: Full-retraction detection limit switch for
4th to top boom sections
3.1 Extension
3.2 Retraction
3.3 Emergency telescoping
9.8 m (32.1 ft) boom (base)
Turn the AML emergency switch to “ON”
(emergency) side.
1. With switch CN503(1) pressed, extend the 4th,
5th, and top boom sections by approximately 1 m
(3.3 ft) each.
At this time, AML displays an error code
immediately after boom extension starts. Check
that the error code is W0019.
2. With switch CN503(2) pressed, fully extend the
2nd and 3rd boom sections.
At this time, AML error code changes immediately
after boom extension starts. Check that the error
code is W0019 until the boom length reaches 23.1
m (75.8 ft).
3. With switch CN503(2) pressed, retract the 2nd
and 3rd boom sections.
At this time, the 4th to top boom sections may
also retract because the No. 3 cylinder is
connected to the tank through the hydraulic valve
orifice.
4. With switch CN503(1) pressed, retract the 4th to
top boom sections.
9.8 m (32.1 ft) boom (base)
Only 2nd and 3rd boom sections can
be telescoped. (When you use lever
to telescope the boom, turn ON the
switch CN485.)
Boom length: 23.3 m (76.4 ft)
Switch CN506 (CN507):
OFF
2nd and 3rd boom sections can be moved to
the stroke ends. (AML works on the basis of
performance with 23.5-m boom.)
(If the stroke end cannot be reached, refer to
"When Adjusting Boom Length" in the section
"Action against Emergency" of Operation
Manual.)
Switch CN506 (CN507): ON
4th to top boom sections can be extended.
(When the switch CN552 turns OFF, AML
works on the basis of performance with
30.3-m boom.)
Approx. 30.0 m (98.4 ft) boom
4th to top boom sections retract.
Switch CN552 : ON
2nd and 3rd boom sections retract.
(Even if stroke remains for the 4th to top
boom sections at this time, the hydraulic
valve orifice causes them to fully retract.)
2017.2.Rev.
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