TM 5-3805-281-24-1
Theory of Operation
ARM REGENERATIVE VALVE OPERATION
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regenerative solenoid valve to energizes the coil. The
The arm regenerative valve (I) is used to improve arm
solenoid valve then sends a pressure signal (G) to the
controllability and prevent arm cylinder cavitation
arm regenerative valve (E) shifting it. The orifices in
during arm IN operation by combining the return oil
the arm regenerative valve restrict the flow of return oil
from arm cylinder rod end with the pump supply oil to
to the return passage. Some of the return oil from the
the arm cylinder head end. The arm regenerative
rod end of arm cylinder now flows through port (D) and
function does not operate in the grading and precision
arm regenerative circuit check valve (B) to the head
work modes.
end of arm cylinder with the pump supply oil from the
front pump (C). The port and check valve are located
Under the following operating conditions: low rear
in the arm II valve (A) spool. Return oil not used flows
pump delivery pressure, high pilot pressure to the pilot
through the orifices in the arm regenerative valve to
cap for arm in, and boom up actuated, gravity can pull
the return passage.
the arm in faster than the pumps can supply oil to the
arm cylinder head end. The operating conditions are
There are two check valves located in the passages to
sensed by the rear pump pressure sensor, arm in
the arm II valve to prevent back flow through the
pressure sensor, and boom up pressure switch. The
control valve. For arm in function, return oil flows
pressure switch and sensors send electrical signals to
through the arm II valve only.
the engine and pump controller. The engine and pump
controller sends an electrical signal to the arm
Continued on next page
CED,TX08227,3163
1902JUN981/2
