Manitowoc 999 User Manual

Reference Only
MAINTENANCE 999 LUFFING JIB OPERATOR MANUAL
6-4
Published 05-15-17, Control # 043-09
5. After boom and jib are raised, check operation of MAX
UP 2 limit following instructions under Operational
Checks.
Max Down Limit Adjustment
See Figure 6-1 for the following procedure.
1. Rotate actuator (2) counterclockwise until Hole B in
actuator lines up with hole in boom top.
2. Insert alignment pin (14) through Hole B in actuator and
into hole in boom top. Make sure shoulder of pin rests
squarely against actuator to ensure proper alignment for
adjustment.
3. Slide limit switch (5) against cam (8) until limit switch just
“clicks” open and hold.
4. Securely tighten screws in limit switch.
5. Remove alignment pin (14).
6. Check MAX DOWN limit setting as follows:
a. Rotate actuator (2) clockwise away from limit switch
and then counterclockwise so MAX DOWN limit
switch roller contacts cam (8).
b. Limit switch must click open when Hole B in actuator
lines up with hole in boom top (step 2
).
c. With LUFFING JIB mode selected, push luffing jib
handle forward. Luffing hoist must not turn and
LUFFING JIB MAX DOWN operating limit should
come on.
d. Readjust limit switch if necessary to ensure proper
operation.
Final Adjustment Steps
See Figure 6-1 for the following procedure.
1. Securely fasten actuator (2) to jib butt with screws and
lock washers provided.
2. Once limit switches are properly adjusted, drill and seal
limit switch spacers (9) to mounting bracket (10) with
dowel pins and lead wire seals.
3. Make sure boom and luffing jib angle indicators are
properly adjusted prior to raising boom and luffing jib.
See instructions in Luffing Jib Operator/Parts Manual.
Operational Checks
Make the following operational checks after the boom and jib
are raised.
1. Raise boom and luffing jib until boom is at 80°.
2. Monitor BOOM TO LUFFING JIB ANGLE on digital
display while performing remaining steps.
3. SLOWLY raise luffing jib.
4. Luffing hoist must stop and be inoperable when boom to
luffing jib angle is 168°.
5. Operating limit alert should come on indicating
LUFFING JIB MAX UP 1 limit has been reached.
Stop raising luffing jib immediately if limit switch
fails to stop luffing hoist. Lower boom and jib to
ground and readjust MAX UP 1 limit switch.
6. Turn limit bypass key clockwise to bypass MAX UP 1
limit.
7. SLOWLY raise luffing jib past MAX UP LIMIT 1.
8. Luffing hoist must stop and be inoperable when boom to
luffing jib angle is 170°.
9. Operating limit alert should come on indicating
LUFFING JIB MAX UP 2 limit has been reached.
Stop raising luffing jib immediately if limit switch
fails to stop luffing hoist. Lower boom and jib to
ground and readjust MAX UP 2 limit switch.
10. SLOWLY lower luffing jib.
11. Luffing hoist must stop and be inoperable when boom to
luffing jib angle is 55°.
Stop lowering luffing jib immediately if limit switch
fails to stop luffing hoist. Lower boom and jib to
ground and readjust MAX DOWN limit switch.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English