HYDRAULIC SYSTEM MLC165-1 SERVICE/MAINTENANCE MANUAL
2-4
Published 05-26-17, Control # 238-02
Accessory Pump
The accessory pump (Figure 2-4) is a variable-
displacement, pressure compensated pump which provides
flow to the accessory manifold. The displacement is
controlled by proportional solenoid valve HS-502, driven by
node 5. The control system reads the accessory pressure
transducer, located in the accessory valve manifold, and
drives the pump displacement to provide the correct
pressure for the accessory being used.
Free Fall Cooling Pump
The free fall cooling pump (Figure 2-5) is part of the open
hydraulic system and is a fixed-displacement pump that
provides cooling flow to the free fall manifold.
Figure 2-4. Accessory Pump
Item Description
B Pressure Port (out)
S Suction Port (in)
L1 Case Drain Ports (plugged)
L1 Case Drain Port (unplugged)
Figure 2-5. Free Fall Cooling Pump
M100910
Item Description
A Inlet Port
BOutlet Port
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