TM 5-3805-281-24-1
Theory of Operation
AUXILIARY HYDRAULIC SYSTEM
OPERATION
The auxiliary hydraulic control circuit is used to power
attachments of various types. This system is set up to
power an impact hammer requiring flow in only one
direction. A foot switch activates a solenoid valve which
directs pilot pressure to the top of the main auxiliary
spool. This shifts the spool to direct pressure oil to the
attachment plumbing. The return circuit is a low pressure
only circuit and returns directly to the return line just
before it enters the reservoir. The hammer return oil does
not go through the oil cooler circuit. The auxiliary lines use
screw-together couplers to attach the hammer hoses. The
couplers can be connected under pressure.
This system also controls the flow volume of oil to the
hammer by reducing the pump regulation pressure with a
pressure reducing valve. this controls the stroke of the
pump to only provide the amount of oil needed by the
hammer.
CED,OUOE020,1
1907APR991/1
9025
05
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