TM 5-3805-281-24-1
Sub-System Diagnostics
propel speed, power boost, speed sense, and arm
HYDRAULIC CONTROL CIRCUITS
regenerative proportional solenoids.
The hydraulic control circuits consist of pressure
These circuits control the hydraulic functions of the
sensors and switches, proportional control solenoids,
machine at the same time the EPC is controlling
and power boost switch. The EPC utilizes input signals
engine speed to provide maximum machine quickness
from the pressure sensors and switches to monitor the
and productivity for the load conditions and operating
machine hydraulic functions. It then controls the propel
mode selected.
speed, relief valve pressure, pump swash, and arm
regenerative functions by sending control signals to the
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9015
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