21
(1) Change mechatro controller to "PRESSURE DRAINING MODE" by operating switch on gauge
cluster.
For detail of changing mode method, refer to "How to switch to "Pressure release mode"" on item
22.11.1.
(2) Once mechatro controller decides it as pressure release control, regardless of each input signal
(operating pilot, accel potentiometer, etc.) the mechatro controller;
1.
Outputs minimum tilt angle command to P1, P2 pump proportional valves and fixes P1, P2 pump
to minimum tilt angle.
2.
Outputs command of pressure release and outputs command of pressure release control to ECU
and fixes engine speed to pressure release control speed.
3.
Outputs maximum command to P1 and P2 unload valves and each pilot secondary pressure fixes
P1 and P2 unload valves to the maximum opening.
(3) Mechatro controller senses output voltage from the main pump high pressure sensor, decides the
pump pressure and displays "DRAINING HYD. PRESS" or "FAIL DRAIN HYD. PRESS" on gauge
cluster.
(4) Each pump delivery oil is unloaded to tank passage enabling for the remained pressure (trapped
pressure) to be released by operating each control lever and switching spool with the unload valve
opened.
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21. MECHATRO CONTROLLER
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21-23
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