Manitowoc MLC650 Service Maintenance Manual

Reference Only
Manitowoc Published 09-09-16, Control # 229-09 2-31
MLC650 SERVICE/MAINTENANCE MANUAL HYDRAULIC SYSTEM
2
2
The following procedure is used at the factory to start a new
crane engine for the first time. It is necessary to use this
procedure in the field only if the entire hydraulic system has
been drained.
This procedure requires two people, one to start the engine
and monitor pressures on the diagnostic screens and one to
monitor gauge pressure and check for leaks.
1. Before starting the engine, perform the Pressure
Transducer Test on page 2-33.
2. Make sure the hydraulic tank shut-off valve is fully open
(Figure 2-24
).
NOTE: Pumps can be damaged from cavitation if step 2
is
not performed.
3. At the engine, disengage the engine clutch
(Figure 2-26
).
4. Connect the bleed lines equipped with shut-off valves to
each pressure transducer gauge port (1, Figure 2-27
).
5. Open the shut-off valve in each bleed line. Use a
suitable container to catch the oil.
6. Start the engine at the lowest possible speed and make
necessary adjustments before engaging the clutch.
7. Slowly engage and disengage the clutch and check for
charge pressure.
8. Bleed the pressure transducers.
a. Observe the oil flowing from the bleed line at each
pressure transducer.
b. Close each bleed valve when a clear, steady stream
of oil appears (no air bubbles in oil).
c. If the oil does not flow from any bleed lines,
determine the cause and correct.
9. On the control system diagnostic screens, check the
pump pressures for load drums, boom hoist, swing, and
travel pumps.
a. Make sure the pressure reading for each pump is 22
to 25,5 bar (250 to 370 psi).
b. If the pump pressures are not within specified
range, stop the engine immediately. Determine the
cause of the faulty pressure and correct.
10. Stop the engine.
11. Remove the bleed lines from the gauge couplers at each
pressure transducer.
12. Start and run the engine at low idle.
13. With the engine at low idle, extend and retract all the
cylinders three times—gantry cylinders, mast cylinders,
back hitch pins, cab tilt, boom hinge pin, carbody jacks,
and crawler pins.
If the oil level drops to 53%, a fault alarm will come on
and a fault symbol will appear on the active display. The
HYDRAULIC FLUID LOW icon will appear on the control
system crane display. Fill the tank immediately.
14. With the engine running at low idle, slowly cycle each
crane function in both directions for at least 5 minutes to
vent any remaining air from the hydraulic system.
15. Make sure all the crane functions operate in the proper
direction in relation to the control handle movement.
16. Check for hydraulic leaks and correct the cause if found.
17. Stop the engine and the fill hydraulic tank to the proper
level.
18. Perform the Controls Calibration on page 2-33
.
WARNING
Burn Hazard!
Oil in hydraulic tank may be under pressure and
extremely hot. Hot oil can cause severe injury.
Hot oil can escape when you remove the stand pipe plug,
filter cover, or breather. Relieve pressure through the air
valve on the tank before servicing.
CAUTION
Avoid Damage to Hydraulic System!
If the hydraulic fluid low alarm comes on at any time
during the startup procedure, add oil to the tank.
CAUTION
Avoid Engine Clutch Damage!
Observe the following precautions for the engine clutch:
• Decrease engine speed to idle before engaging or
disengaging the clutch.
• Do not run the engine longer than 20 minutes with the
clutch disengaged.
CAUTION
Equipment Damage!
Check the pump pressures during the first 2 minutes of
operation. If the pressure for any pump is not within the
specified range, shut down the engine immediately to
prevent pump damage. Troubleshoot to determine the
cause of the problem.

Manitowoc MLC650 Specifications

General

Brand	Manitowoc
Model	MLC650
Category	Construction Equipment
Language	English