Copyright © 2000 Rayco - All Rights Reserved
Printed in U.S.A.
51
RAYCO
®
RG 1635A STUMP CUTTER
TROUBLESHOOTING
2. Pilot check valves are located in the cutting
boom motion control circuit to reduce the risk of
uncontrolled falling or drifting of the boom.
Such might otherwise occur when the engine is
turned off or while on a slope:
' A pilot check valve (12) is mounted in the
rod end port of the RAISE/LOWER
cylinder. It has a spring-loaded check
valve that prevents fluid from exhausting
from the cylinder rod end port to the
reservoir, so that the cutting boom cannot
fall without a signal from the control
valve. When the control valve sends high
pressure fluid to the body end port of the
cylinder, it also enters the pilot check
valve and overcomes the spring in the
check valve, opening flow again from the
cylinder rod end port to the reservoir.
Only then may the cutting boom lower,
under the control of the operator.
Hydraulic Circuits
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