Main System Relief Valve; Knife Down Sequence Valve - Challenge CHAMPION 370 TC Instructions And Parts Manual

Table of Contents

8.8.1 Main System Relief Valve

This valve maintains the overall hydraulic pressure for the entire system. Factory setting: 1800 PSI.

Check Procedure:

1. Open the left access door on front of the cutter.

2. Turn the power on and, with a small stack of paper under the clamp, make a cut to hold the

knife down on the cutting stick. Read the pressure off the main system pressure gauge (front

gauge) while the knife is down. If the gauge does not read 1800 PSI, an adjustment is

needed. You may need to send knife down in maintenance mode to read the gauge more

easily.

To Adjust:

1. Loosen the lock nut on the relief valve. Use an Allen wrench to turn the adjusting screw.

Turn clockwise to increase pressure, counterclockwise, to decrease pressure.

adjustment. One holds the cut buttons in and the other adjusts the valve screw. Be extremely careful

to keep hands and tools away from moving parts. The only thing that has to be handled is the

adjusting wrench! A possible pinch point exists between the clamp parallel rod and the top of the

valve solenoids. Do not place hands or tools in this area if the machine is to be cycled.

2. Make a cut and hold the buttons in or go to knife down adjustment in maintenance mode to

cycle the hydraulics. While reading the main system gauge, adjust the valve screw until you

have the correct pressure.

3. Tighten the lock nut while holding the hex wrench in place.

4. Proceed to readjust the other valves.

This valve controls the clamp and knife sequence. It keeps the knife up until after the clamp has

made contact. It is mounted on the knife cylinder. Factory Setting: 1600 PSI.

NOTE: Main System Pressure must be set at 1800 PSI before making this adjustment.

Check Procedure:

1. Open the left access door on front of the cutter.

2. Press the cut buttons while reading the pressure on the main system pressure gauge (front

gauge). The gauge should read approximately 1600 PSI as the knife is moving down (when

bottomed, the gauge will jump to 1800 PSI showing the Main System Relief Pressure

previously set).

3. If correct, proceed to check the remaining valves.

To adjust:

1. Loosen the lock nut.

PINCH POINT—It will require two people to perform the following

8.0 Maintenance Guide

Table of Contents