Manitowoc Published 05-15-17, Control # 043-09 3-9
999 LUFFING JIB OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
The boom can be lowered after the limit is contacted.
LIMIT BYPASS TEST: Perform the following test to
determine if the boom up limit on your crane can be
bypassed or not:
1. Lower the boom onto blocking at ground level.
2. Have an assistant push the boom stop rod in to trip the
boom up limit switch open.
3. Rotate limit bypass key (D3) to the bypass position and
hold.
4. Try to boom up SLOWLY — do not raise the boom any
higher than necessary to perform the test:
a. If the boom rises, your boom up limit can be
bypassed.
b. If the boom does not rise, your boom up limit cannot
be bypassed.
5. The test is complete: release the limit bypass key and
the boom stop rod to the normal operating positions.
OPERATING PRECAUTIONS
1. Read and comply with instructions in Liftcrane Luffing
Jib Capacity Charts provided with luffing jib attachment.
Do not operate beyond limits given in capacity charts.
Make sure proper counterweight is installed.
2. Read and comply with instructions in this manual and in
Crane Operator Manual.
3. Read and comply with Maximum Allowable Travel
Specifications in Luffing Jib Capacity Chart Manual.
4. Make sure luffing jib attachment is installed properly.
Read and comply with instructions in Section 4.
5. Make sure all operating limits — block-up, boom and jib
stops, boom and jib angle indicators, and Rated
Capacity Indicator/Limiter (RCL) — are installed and
operating properly. See Section 6 for adjustment
procedures. See separate Rated Capacity Indicator/
Limiter Manual for operation and calibration of the RCL.
The LUFFING JIB mode must be selected and
confirmed to turn on luffing hoist limits.
6. Raise and lower attachment as instructed in Section 4.
7. Perform all operations with crane on a firm, level,
uniformly supporting surface. Crane must be level to
within 1 ft (0,3 m) in 100 ft (30,1 m).
8. Operate all crane functions slowly and smoothly. Avoid
sudden starts and stops which could side load or shock
load attachment.
9. Do not operate, to include raising boom and luffing jib
from ground level, if wind exceeds allowable limits given
in Capacity Charts provided with crane and luffing jib.
Contact your local weather station for wind velocity.
10. Disable free fall for rear drum by moving valve handle to
DISABLE (down) position as shown in .
WARNING
Falling Boom/Jib Hazard!
If you bypass boom up limit for any reason, DO NOT allow
physical boom stops to bottom out. Boom butt could be
damaged, causing boom and jib to fall over backwards.
Crush Hazard!
Maintain constant communication between operator and
assistant during following steps.
Stay clear of moving parts.
WARNING
Observe the following precautions to prevent tipping,
structural failure of attachment, and death or serious injury
to personnel.
FIGURE 3-5
ENABLE
Right Side
Enclosure
(1 or 2 Places)
Free-Fall
Clutch/Brake
Housing
DISABLE
P2105
To Next Page
Loading...
Need help?
General
