Changing hoist control valve on EH3500-2.lets look at the troubleshooting part if the dump body can't go up and the main pumps are working just alright most technicians quickly comes to conclude that the hoist control valve is faulty it must be bypassing inside.forggeting the most main key prayer which is the 4-unit proportional control solenoid valve which controls the hoist control valve,merge control of main pump 1 and 2 and supply pilot pressure to main pump 1 and 2 to control pump swash angle.the 4-unit proportional valve is controlled by the Manual movement of the hoist lever,which sends a pilot signal to the hoist control valve proportional to the hoist lever movement.when it comes to troubleshooting always start with the basics and move step my step. remember to always do your J.S.A before starting any given task.
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--Heavy duty Technician/Rigg Mechanic supervisor
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