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| Illustration 1 | g00526787 |
Solenoid valves (1) Implement activation (2) Travel activation (3) Swing brake (4) Creeper speed | |
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| Illustration 2 | g00526790 |
Solenoid valve | |
The pilot manifold includes solenoid operated pilot control valves. The cartridge type solenoid valves are identical for all manifold elements. The following solenoid valves are cartridge type solenoid valves: creeper speed solenoid valve (4), swing brake solenoid valve (3), travel activation solenoid valve (2), implement activation solenoid valve (1), main pump proportional solenoid valve and swing pump proportional solenoid valve.
Each solenoid valve includes a cartridge with a spool and a spring. A mechanical pin can be depressed in the head of the solenoid which permits manual operation of the valve. The cartridge is held in the pilot manifold by a flange.
Supply oil to the pilot manifold enters the block through the pilot flow control valve (priority flow divider). The priority flow divider ensures that pilot oil is supplied through the filter from the pilot accumulator. The priority flow control valve limits the oil flow to 15 L/min (4 US gpm).
When the solenoid is de-energized, pilot pump oil pressure enters the inlet port of the valve block. The regulating spool remains in the position shown. The oil flow from the inlet port "P" through the passage is stopped by the regulating spool.
A connection is made between the pilot oil line "A" and the control device through chamber "T" to the tank return line so that the pilot line is without pressure.
When the solenoid is energized, the connection between passage "P" and chamber "T" is closed. Passage "A" is connected to passage "P" and pilot oil pressure can go to the respective control device.
To relieve pressure in the spring chamber passage, the spool is connected to the tank return line when the solenoid is de-energized.