Manitowoc MLC300 User Manual

Manitowoc Published 11-20-19, Control # 234-19 3-77
MLC300 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
3
1
3
c. If the free fall brake pedal is not already latched
down, be prepared to apply it when the drum control
handle is moved to off. Otherwise, the load will free
fall.
8. To TURN OFF FREE FALL for either Drum 2 or 3:
a. Latch down the corresponding free fall brake pedal.
b. In the Free Fall Selection Screen (Figure 3-24
):
• Highlight the “I/O” selection box (2 or 3) for the
desired Drum 2 or 3. This will allow you to
toggle between the ON (I) and OFF (O) boxes
with the OK key.
• With the selection box highlighted, click OK to
highlight to the “O” box and turn OFF free fall.
c. For the desired drum, remove the locking pin (1,
Figure 3-23
), rotate the selector handle (2 or 3) IN to
the “O” (OFF) position, and reinstall the locking pin
(1) in the “O” holes.
Free Fall Brake Pedal Hydraulic Pressure
Test
Test the free fall brake pedals daily prior to initial use.
1. Land the load on the drum of the pedal being tested.
2. Turn off the drum park switch for the corresponding
drum.
3. Lock the VPC.
4. For the corresponding drum:
a. Lock the selector handle in the “O” (off) position.
See step 8
. This will prevent the drum from lowering
during the remaining steps.
b. Turn ON free fall. See step 3f
.
c. Monitor brake pressure in the corresponding Drum
2 or 3 Control Information Screen of the main
display (Figure 3-25
). With drum slip at 100%,
pressure should be approximately:
• 30 bar (430 psi) with 11% pedal command
• 0-5 bar (0-70 psi) with 100% pedal command
(pedal up fully)
d. Determine and correct the cause of the problem if
the brake pressure is not within the specified range.
Free Fall Brake Operational Test
A free fall operational test must be performed weekly as
instructed in Section 2 of your MLC300 Service Manual.
Figure 3-25. Drum 2 or 3 Control Information Screen
1 Drum 2 or 3 Free Fall Brake Pressure
2 Drum 2 Icon
3 Drum 3 Icon
4 Drum 2 or 3 Free Fall Brake Pedal Command
5 Drum 2 or 3 Speed
WARNING
Falling Load Hazard
Do not operate a drum in free fall if the corresponding
brake pressure is not within the specified range.
The brake could slip allowing the load to lower
uncontrolled.

Manitowoc MLC300 Specifications

General

Brand	Manitowoc
Model	MLC300
Category	Construction Equipment
Language	English