Challenge CHAMPION 305 TC, Instructions And Parts Manual

Page: 55 / 110

14.0 Troubleshooting
55
CONCAVE CUTTING- ENDS WIDE, CENTER NARROW
1. Excessive moisture at edges of paper
2. More ink on edges of lift
CONCAVE CUTTING- VARIATION OF TOP AND BOTTOM
1. Soft stock not firmly clamped
2. Knife is dull or ground incorrectly
3. Knife bar gibs loose
4. Air in stock when clamped, pulls away from backgauge
5. Clamp not parallel to table
INCONSISTENT STOPPING OF KNIFE IN UP POSITION
1. Bind in knife linkage or gibs
2. Up sequence valve not properly adjusted
3. Knife links worn
HESITATION OF KNIFE
1. Dull knife
2. Seals worn in knife or clamp cylinder
3. Defective counterbalance valve on knife cylinder
4. Knife links worn
KNIFE WON’T RETURN
1. Defective high pressure valve
2. Directional valve(s) stuck in
3. Up sequence pressure too low
CLAMP WON’T RETURN
1. Up sequence pressure too high
2. Bind in clamp linkage or gibs
3. Clamp not parallel to table
4. Clamp return spring defective
KNIFE DRIFTS DOWN
1. Knife bar gibs out of adjustment
2. Defective counterbalance valve on knife cylinder
3. Defective seals in knife cylinder
4. Knife latch out of adjustment
KNIFE STOPS IN STOCK
1. Knife dull
2. Relief valve defective
3. Pressure control valve clogged or defective
4. Knife cylinder seals worn
5. Clamp cylinder seals worn
6. Motor stalling due to low voltage or too small wire to machine
NOISY AND SLUGGISH HYDRAULIC SYSTEM
1. Cylinder seals worn on clamp or knife
2. Low on hydraulic fluid
3. Worn spline coupling in motor/pump
4. Defective main system valve/dump valve
INACCURATE CUTTING
1. Backgauge not square
2. Knife bar has play- tighten gibs