Challenge Champion 305 XD, Technical Service And Parts Manual

Page: 26 / 138

3.0 Maintenance Guide
26
2. Turn the main-power disconnect switch to the off position, DISCONNECT THE POWER AND
LOCK IT OUT! (See Power Lockout Procedure, page 5.)
3. Place a pan underneath the valve and slowly loosen the pilot valve connections to bleed off
any pressure.
4. Remove the check valve and hoses from the knife cylinder. Replace the hose fitting attached
to the cylinder with the two 90 0 fittings on the check valve. (The smaller fitting goes on the
top port.) Reconnect the hoses.
5. Reconnect the power and run the machine.
6. If the knife cycles without the valve in line, replace with a new check valve.
3.2.4 Clamp Return Speed Adjustment
The clamp return speed can be adjusted if it becomes too sluggish or too fast. This adjustment is
made on the air cylinder that brings the clamp down. To make this adjustment, remove the rear arch
cover. Turn the lower flow control on the air cylinder clockwise to decrease the return speed of the
clamp. Turn the flow control counter-clockwise to increase the return speed of the clamp. The clamp
should be adjusted such that it returns fast but does not bounce at the top of the stroke.
The clamp down speed can be adjusted to personal preference. Adjust the clamp down speed using
the upper flow control valve on the upper end of the cylinder (rod end).
3.2.5 Table Maintenance
The table of a paper cutter requires periodic maintenance to remove surface oxidation. Polishing is
also required to provide a smooth surface for paper to move freely. The frequency of this
maintenance will be determined by a number of factors. Among these are the humidity,
environmental dust, handprints, liquid spills, and type of paper stock. We recommend the use of the
Challenge Cutter Care Kit P/N 16077 for of your table care needs.
To prepare a new machine’s table, use the following instructions.
1. Remove the rust-protective coating from the table with a solvent.
2. Remove all solvent residues from the table with a dry cloth. Continue until the cloth shows no
sign of residue.
3. Apply a light coating of an SAE 10-weight non-detergent motor oil or equivalent to the table and
allow it to penetrate for at least one hour.
4. Remove all excess oil from the table with paper toweling (not cloth) until the paper towel you are
using shows no sign of oil.
5.
Apply a paste wax (Challenge P/N 16078) to the table to seal the pores of the metal.
Note: Do not use a wax that contains a cleaning compound on the table. The cleaner contains
microscopic abrasive particles that will cause wear between the table and the bottom of the
backgauge. A silicone spray (Challenge P/N 16079) will show the same type of wear as the cleaner if
the excess silicone is not removed. If the excess is not removed, the silicone spray has a substance
that holds the silicone to the surface it is sprayed on that causes a black, gummy build-up under the
backgauge. If a silicone spray is used, paper toweling must be used to remove the excess to prevent
this wear and build-up.
To clean surface oxidation from a table, follow the procedure below: