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HYDRAULIC CIRCUIT
CASE TRAINING CENTER
AUGUST 2000
Description of Operation
Circuit for Breaker & Crusher
(2 Speed Confluence Crusher Circuit)
When pushing the switch in the cab to crusher side, the solenoid is turned ON.
When the auxiliary pedal is moved, pilot pressure from the remote control valve passes through the
solenoid valve via the shuttle valve and enters P port of the holding valve and “a” port of the central bypass
cut valve in the control valve.
The central bypass cut valve moves to the left and the central bypass is shut off.
Due to the pilot pressure entered P port of the holding valve, the spool is moved to the right. The pressure
in the spring chamber is reduced and the holding valve check will be released because the spring chamber
of the holding valve check is returned to the tank. As a result, hydraulic oil at P0 port of the control valve
enters OPT port of control valve auxiliary spool via the holding valve check and merges the hydraulic oil
from A2.
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