Manitowoc MLC165-1 Service Maintenance Manual

Reference Only
HYDRAULIC SYSTEM MLC165-1 SERVICE/MAINTENANCE MANUAL
2-2
Published 05-26-17, Control # 238-02
Main Pump
The main pump (Figure 2-2) is part of the open hydraulic
system and contains two variable-displacement pumps.
These pumps provide flow to the main control valve
manifold. The pump displacements are hydraulically
controlled by load-sensing and horsepower limiting circuits
within the pump.
The hydraulic load-sensing and horsepower sensing circuits
can be over-ridden by load-sensing override solenoid HS-
304 and horsepower override solenoid HS-303, which are
activated by node 3. The load-sensing override function is
not currently used. In horsepower override, software control
uses the engine speed and fuel consumption rate to adjust
the pump power consumption in order to prevent overloading
the engine.
The main pump also contains a third fixed-displacement
pump. This pump provides flow to the pilot circuit.
Figure 2-2. Main Pump
M100907
Item Description Item Description
A1, A2 Service Ports X4 Control Pressure Port for load-sensing
R1, R3 Air Bleed Ports M1 Gauge Port A1
X6 Control Pressure Port for load-sensing - Shifting M2 Gauge Port A2
X3 Control Pressure Port for Power Override M Gauge Port
A3 Service Port (auxiliary pump) R2 Oil Drain
M3 Gauge Port for Power Override (plugged in
normal operation)
S Suction Port

Manitowoc MLC165-1 Specifications

General

Brand	Manitowoc
Model	MLC165-1
Category	Construction Equipment
Language	English