Manitowoc Published 11-20-19, Control # 234-19 3-89
MLC300 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
AC OPERATION
See Figure 3-32 for the following procedure.
An optional APU equipped with a 10 KW, continuous duty,
60 HZ AC generator and a DC charging system is available
from Manitowoc to power the following operations when the
crane engine is off:
• Cab heater and air conditioner
• Crane batteries (charging)
• Optional cold weather heaters
• Any AC lighting the crane is equipped with
Refer to the APU manufacturer’s manual for operation and
maintenance instructions.
The APU can be started with the switch in the crane operator
cab. See APU Ignition Switch on page 3-18
.
The APU prep package includes an external heater which
heats the water used to heat the operator cab. The heater is
controlled using screens in the Main Display. See the
MLC300 Main Display Operation Manual for heater
instructions.
Installing APU
NOTE The fuel hoses (7) and the electric cables (8, 9, and
10) are stored for shipping in the job boxes provided
with your crane.
1. Stop the crane engine.
2. Using a forklift or an assist crane, lift the APU (1, View A)
into position on the right side of the crane.
3. Remove the locking pins (2, View B) from the mounting
brackets on the rotating bed.
4. Position the APU so the hooks (3, View B) engage the
fixed pins (4) on the rotating bed,
5. Install the locking pins (2, View B).
6. Remove the forklift or the assist crane.
7. Adjust bolts (5, View B), as needed, to level the APU.
8. Connect two air conditioner hoses (6, View C) from the
crane to the quick couplers on the APU.
Match the identification numbers on the hoses with the
identification numbers on the quick couplers for proper
connection.
9. Connect two fuel hoses (7, View C) to the quick-couplers
on the APU and to the quick couplers on the right side of
the rotating bed (View D).
Match the identification numbers on the hoses with the
identification numbers on the quick couplers for proper
connection.
10. Connect the electric cable (8, View C) to the receptacle
on the APU and to the receptacle on the rotating bed
(View E).
11. Connect the electric cable (9, View C) to the receptacle
on the APU and to the receptacle on the rotating bed
(View E).
12. Connect the power supply cable (10, View C) to the
interlock switch (11) on the APU and to the interlock
switch (12, View E) on the rotating bed.
Turning ON AC Powered Components
NOTE The following instructions assume that the electric
cables are connected between the APU and the
crane. It is only necessary to disconnect the electric
cables when the APU is removed from the crane.
1. Stop the crane engine and turn the ignition switch to off.
2. Start the APU engine using the switch in the operator
cab or on the APU.
NOTE If the switch in the cab is used, the main engine
ignition switch must be in the RUN position.
The APU will not start if the APU doors are removed.
3. Turn ON the interlock switch (11) at the APU and the
interlock switch (12) on the rotating bed.
This step is required only at installation. Thereafter, the
interlock switches can remain on except when servicing
the APU or removing it.
4. Turn ON the circuit breakers in the load center (13).
5. The AC and DC powered components can now be
turned on in the operator cab (heater and air conditioner,
work lights, and other such components).
Turning OFF AC Powered Components
1. Turn OFF the circuit breakers in the load center (13,
View E).
2. Stop the APU engine using the switch in the operator
cab or on the APU.
NOTE Turning OFF the interlock switch (11) at the APU and
the interlock switch (12) on the rotating bed is
required only when servicing the APU or removing it.
Removing APU
1. If the air conditioning hoses are connected, proceed as
follows to prevent the air conditioner from losing its
charge:
a. Leave the air conditioner hoses connected and stop
the APU.
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