5. EPF (Engine Protection Feature

2nd option circuit (hydraulic rotation fork)

As an example, this section explains the case in which the hydraulic rotation fork attachment is used.

By operating the 2nd option remote control valve to the right swing side, the pilot pressure oil is fed to the control valve par2 port.

The 4th hydraulic pump OUT discharge oil is fed to the control valve Pr port, goes through the 2nd option spool and flows to the hydraulic rotation fork to operate to the right swing side.

At this time, the 2nd option pilot pressure switch signal is detected and the auto idle function is released.

The return oil from the hydraulic rotation fork goes through the 2nd option spool and returns to the hydraulic oil tank.

The oil in the 2nd option drain line returns to the hydraulic oil tank without going through the control valve.

Pressure line Tank line Pilot pressure line Pilot tank line Electric line

1 Control valve 9 Oil cooler 2 Travel pilot pressure sensor 10 Hydraulic rotation fork 3 Upper pilot pressure sensor 11 2nd option pilot pressure switch 4 Lever lock 12 Monitor display 5 5 stack solenoid valve 13 Computer A 6 Console lever lock switch 14 4th pump 7 2nd option remote control valve 15 Hydraulic pump 8 Check valve