Manitowoc MLC300 Service And Maintenance Manual

Reference Only
HYDRAULIC SYSTEM MLC300 SERVICE/MAINTENANCE MANUAL
2-28
Published 11-22-17, Control # 257-02
SHOP PROCEDURES
Initial Hydraulic Oil Fill
See Figure 2-15 for the following procedure.
The following procedure is used at the factory to fill the
hydraulic system on a new crane. It is necessary to use this
procedure in the field only if the entire hydraulic system has
been drained.
1. Open the hydraulic tank shut-off valves (12, 13, 14, and
15).
2. Make sure the hydraulic tank quick-drain valves (11) are
closed.
3. At the engine, disengage the engine clutch (see
Figure 2-24
).
4. Stop the engine after disengaging the engine clutch.
5. Open the Schrader valve (5) or the vent valve (6) on the
hydraulic tank to release pressure when filling the
hydraulic tank through the power-fill coupling (3).
6. Fill the hydraulic tank by pumping oil through the power-
fill coupling with an owner-supplied portable pump. Use
new hydraulic oil filtered through a 10-micron filter.
Do not fill the hydraulic tank through the desiccant
breather (7) or the top of Filter 1 (2). The hydraulic
system could be contaminated from unfiltered oil.
7. Fill the hydraulic tank to the Full Cold level on the oil
level sight gauge (4).
8. Fill all motor cases with new hydraulic oil filtered through
a 10-micron filter as follows.
a. Disconnect the fitting from the highest case drain
port of each motor.
b. Fill each motor case to the level of the case drain
port.
c. Reconnect the fittings.
9. Apply 0.20 to 0.34 bar (3 to 5 psi) of owner-supplied air
pressure to the air vent on the hydraulic tank.
The tank breather allows 0.21 bar (3 psi) of pressure to
remain in the tank to force hydraulic oil into the charge
system of the closed circuit lines.
10. Bleed the closed-loop motor cases (Drums 1, 2, and 3)
by cracking open the MA or MB port to release trapped
air.
NOTE: It is extremely important to perform the bleed
procedure described above in the field anytime the
system is drained completely.
11. Check for hydraulic leaks and correct any that are found.
Item Description
1 Engage
2 Disengage
Top of Rotating Bed
FIGURE 2-24
CAUTION
Avoid Engine Clutch Damage!
Observe the following precautions for the engine clutch:
• Decrease the engine speed to idle before engaging
or disengaging the engine clutch.
• Do not run the engine longer than 20 minutes with the
engine clutch disengaged.

Manitowoc MLC300 Specifications

General

Brand	Manitowoc
Model	MLC300
Category	Construction Equipment
Language	English