Half/Pack
®
Issued April 2018
Body and Tailgate
Copyright 2018, Heil Environmental
Printed in the U.S.A.
Body and Tailgate
49
MAIN UNDERBODY VALVE
The Under Body Valve is a Proportional Control Valve. We can control how much hydraulic oil goes to these circuits by
shifting the valve spools small or large amounts. This is done with Pulse Width Modulation (PWM). Instead of just 12v
turning on and off a valve coil, with PWM we can control what the coil receives so we can adjust speeds and cushion the
cylinders.
The 8 valve coils on the Main Under Body Valve are controlled by output signals from the Cortex Controller and can be
viewed with the in the cab.
On the Output section of this document we see outputs that showed PWM %. This is only used for signals going to the
Under Body Valve for Pack Extend and Retract, Arms Up and Down, Forks Up and Down, and Carry Can/Tailgate
sections.
A test light is the best tool to see If you are getting the signal to the valve.
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