Challenge Champion 305 XD, Technical Service And Parts Manual

Page: 14 / 138

3.0 Maintenance Guide
14
Figure 9
1. Main System Relief Valve ( Figure 9 )
This valve maintains the overall hydraulic pressure for the entire system. Factory setting: 1800 psi.
Check Procedure:
a. Open the left access door on front of the cutter.
b. Turn the power on and 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:

Loosen the lock nut on the relief valve. Use an Allen wrench to turn the adjusting screw.
Turn clockwise to increase pressure, counter-clockwise, to decrease pressure.
a. Make a cut and hold the buttons in. Or go to knife down adjustment in maintenance
mode to cycle the hydraulics. Adjust the valve screw until you have the correct pressure.
b. Tighten the lock nut while holding the hex wrench in place.
c. Proceed to readjust the other valves.
2. Knife Down Sequence Valve (Figure 9)
This valve controls the clamp and knife sequence. It keeps the knife up until after the clamp has
made contact. It is the upper right valve on the front of the manifold. Factory Setting: 1600 psi.
NOTE: Main System Pressure must be set at 1800 psi before making this adjustment.
Check Procedure:
a. Open the left access door on front of the cutter.
b. 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).
c. If correct, proceed to check the Pressure Reducer.
Main
System
Gauge
Electronic
Clamp Valve
Main System
Relief Valve
Knife Down
Sequence
Clamp Up
Sequence