Manitowoc Published 11-22-17, Control # 257-02 2-1
MLC300 SERVICE/MAINTENANCE MANUAL HYDRAULIC SYSTEM
SECTION 2
HYDRAULIC SYSTEM
HYDRAULIC SYSTEM OVERVIEW
This section provides a physical description and general
functional overview of the major hydraulic components.
Detailed descriptions of the controls and operations using
these components to form working circuits can be found in
the appropriate sections of this manual.
Hydraulic Pump Locations
There are eight hydraulic pumps driven by the engine.
Figure 2-1
illustrates the location of these pumps and the
motors and cylinders that each drive. Diverter valves allow
some pumps to drive multiple functions as well as combine
pump flows from multiple pumps to drive a single function.
.
Pump Supplies Oil To
1 Drum 2 and Drum 2 Anti-Cavitation
2 Drum 1, Drum 3 Anti-Cavitation, Drum 1 and 3 Selector Valve, Swing Brake, and Crawler Brakes
3 System B—Drum 4, Drum 6, Right Travel, Carbody Jacking Cylinders, Crawler Pins, Rigging Winch, Boom Butt Pins, and Self-
Assembly Cylinder
4 System A—Drum 4, Left Travel, Live Mast Raising Cylinders, Live Mast Pins, Gantry Equalizer Pins, Cab Tilt, Warming Circuit
5Swing
6Fan
7 Cooler Circuit
8 Travel Motor Case Cooling, Drums 4 and 6 Brakes, and Pawls
FIGURE 2-1
Position A (I)
Pumps 1 and 5
Position C (III)
Pump 3
Position B (II)
Pumps 2, 6, and 8
Position D (IV)
Pumps 4 and 7
NOTE: The pump numbers given above correspond to the pump numbers in the electrical schematic and the wiring diagram located at the
end of Section 3.
System A corresponds to solenoid valve bank on left side of rotating bed.
System B corresponds to solenoid valve bank on right side of rotating bed.
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