Manitowoc MLC165-1 Service Maintenance Manual

Reference Only
Manitowoc Published 05-26-17, Control # 238-02 4-3
MLC165-1 SERVICE/MAINTENANCE MANUAL BOOM
4
4
Automatic Boom Stop Adjustment
See Figure 4-2 for the following procedure.
The limit switch for the automatic boom stop was set at the
factory and should not require periodic adjustment.
Adjustment is necessary when:
• Parts are replaced
• The boom is operated with luffing jib removed
• The boom is operated with luffing jib installed
The following procedure assumes that the Rated Capacity
Limiter/Indicator (RCL/RCI) is installed and properly
calibrated.
During the following procedure, the boom angle is monitored
on the RCL/RCI working screen and on a digital protractor-
level (13, View C).
1. Park the crane on a firm level surface or level the crane
by blocking under the crawlers.
2. Check that the proper adjusting rod (2a or 2b) is
installed:
• Rod (2a) for boom without luffing jib
• Rod (2b) for boom with luffing jib
3. Boom up slowly while monitoring the boom angle on the
RCL/RCI working screen.
4. Stop booming up when the boom reaches the specified
maximum boom angle given in the table for View C.
Verify the boom angle with an accurate digital protractor-
level (13) placed on the boom butt bottom chord as
shown in View C. The specified digital level angle (14)
should appear on the protractor-level.
• 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 5.
• If the boom reaches the specified angle before it
stops, go to step 6.
5. If the boom stops before reaching the specified angle:
a. Loosen the jam nut (3, View B).
b. Turn the adjusting rod (2a or 2b) all the way into the
coupling (4).
c. Boom up slowly until the boom reaches the
specified angle and stop.
d. Turn the adjusting rod (2a or 2b) out against the
boom butt (1) until the limit switch (10) “CLICKS”
open.
e. Tighten the jam nut (3).
6. If the boom reaches the specified angle before it stops:
a. Boom up slowly until the boom reaches the
specified angle and stop.
b. Loosen the jam nut (3, View B).
c. Turn the adjusting rod (2a or 2b) out against the
boom butt (1) until the limit switch (10) “CLICKS”
open.
d. Tighten the jam nut (3).
7. Check that the actuator rod (6) over-travels the limit
switch as shown in View A.
8. Boom down and then back up. The boom must stop at
the specified maximum boom angle.
9. If the boom fails to stop, repeat step 3
through step 8.
Automatic Boom Stop Actuator Rod
Replacement
See Figure 4-2 for the following procedure.
1. Park the crane on a firm level surface or level the crane
by blocking under the crawlers.
2. Remove the damaged or incorrect actuator rod (5).
3. Slide the spring washers (7 and 9) and spring (8) over
the new actuator rod (5) while sliding the new actuator
rod into the bracket assembly.
4. Position the actuator rod (5) so the tapered end just
contacts the roller on limit switch (10). The actuator rod
must not depress the limit switch roller.
5. Drill a 1/4 in (6 mm) hole through the spring washer (9)
and the actuator rod (5).
6. Install the spring pin (6).
7. Install the proper adjusting rod (2a or 2b) and perform
Automatic Boom Stop Adjustment
procedure.

Manitowoc MLC165-1 Specifications

General

Brand	Manitowoc
Model	MLC165-1
Category	Construction Equipment
Language	English