Manitowoc 999 User Manual

Reference Only
Manitowoc Published 05-15-17, Control # 043-09 6-9
999 LUFFING JIB OPERATOR MANUAL MAINTENANCE
6
Adjustment
See Figure 6-4 for the following procedure.
NOTE: Reference to LED is past production only.
1. Park the crane on a firm level surface or level the crane
by blocking under the crawlers.
2. Make sure the proper adjusting rod is installed (see
Figure 6-3
and Table 6-1).
3. Raise the boom to specified Angle A (see Figure 6-3
and Table 6-1) while monitoring the angle on the
mechanical indicator or on the operating conditions
screen of the front-console display.
4. Verify that the boom is at the proper Angle A:
a. Place an accurate digital level (13) on the centerline
of the boom butt as shown in View C. Angle A
should appear on the digital level.
b. Raise or lower the boom as necessary.
5. If the boom stops at the specified angle, further
adjustment is not needed.
• If the boom stops before reaching the specified
angle, go to step 6
.
• If the boom reaches the specified angle before it
stops, go to step 7
.
6. If the boom stops before reaching the specified angle:
a. Loosen jam nut (3, View B).
b. Turn adjusting rod (2a, 2b, or 2c) all the way into
coupling (4).
c. Boom up slowly until the boom reaches the
specified angle.
d. Turn adjusting rod (2a, 2b, or 2c) out against boom
butt (1) until limit switch (5) “clicks” open and the
LED is OFF (View A).
e. Tighten jam nut (3).
7. If the boom reaches the specified angle before it stops:
a. Loosen jam nut (3, View B).
b. Turn adjusting rod (2a, 2b, or 2c) out against boom
butt (1) until limit switch (5) “clicks” open and the
LED is OFF (View A).
c. Tighten jam nut (3).
8. Check that actuator rod (11) over-travels the limit switch
as shown in View A.
9. Test the adjustment as follows:
a. Lower the boom several degrees below specified
Angle A.
b. Slowly raise the boom.
c. Boom must stop at specified Angle A. If the
boom does not stop at the specified angle:
- Stop raising the boom (move control handle to
off).
- Lower the boom several degrees below the
specified angle.
d. Repeat adjustment steps 3
through 9.
Actuator Rod Replacement
See Figure 6-4, View B for the following procedure.
1. Remove damaged actuator rod (11).
2. Slide spring washers (7 and 9) and spring (8) over new
actuator rod (12) while sliding the actuator rod into the
bracket assembly.
3. Position actuator rod (11) so the tapered end just
touches the roller of limit switch (5) (View B). The
actuator rod must not depress limit the roller.
4. Drill a 1/4 in (6,35 mm) hole through spring washer (9)
and actuator rod (11).
5. Install dowel pin (10).
6. Install proper adjusting rod (2a, 2b, or 2c) and adjust the
boom stop.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English