Magnum Venus Plastech HIS Troubleshooting Manual - Manual (Page 19)

Page 17
H.I.S. Troubleshooting Manual
Be assured, before making adjustments, that there is no glass build up between the
robber roll mandrel, idler bearing and rotor and the chopper base plate. Check to
see that all rotating parts are free running.
Note: New blades should be dulled by whetting on a piece of cardboard to
remove sharp edges.
Holding the eccentric nut for the idler bearing at the chopper base plate, with a
suitable socket wrench loosen the cap screw and rotate the bearing away from the
rubber roll. Follow the same procedure to loosen the rubber roll and rotate it away
from the blade rotor. Turning the eccentric nut in the direction that will position the
off-center hole toward the gun handle mounting hole on the chopper base plate,
position the rubber roll against the blade rotor so it touches the rotor area between
two blades. Tighten the cap screw while holding the eccentric nut. Physically check
the adjustment by holding the blade rotor and rotating the rubber roll. The tension
should be adjusted so the rubber roll will skid with a little drag against the rotor. The
idler bearing can now be properly positioned in relation to the rubber roll. Rotate the
eccentric nut for the idler bearing so the off-center hole in the eccentric will face
toward the chopper mounting of on the gun handle and the idler bearing sleeve is
against the rubber roll. Back the idler bearing off and away from the rubber roll a
very slight amount. The idler bearing should look like it touches the rubber roll but
will not rotate when the rubber roll is turned. A final check to assure the components
are properly assembled on the base plate should be made before the cover is
secured. A washer should be between the roll mandrel and the base and between
the idler bearing and the base plate. The blade rotor should be aligned edge to
edge with the rubber roll. The blade retainer and spring should approach the rubber
roll prior to the blade. The blade should be supported against the high side of the
blade slot in the rotor (i.e. on the center line). The rotor should be secured to the air
motor shaft with the set screws turned down against the flat on the shaft. Align the
step in cover with the slot on the chopper base plate. Push the cover retainer in the
receptacle and turn ¼ of a turn to secure cover.
Chopper Trouble Shooting:
Problem Cause Action
Air motor will not run Regulator on manifold not
on. Set regulator so gauge
reads more than 20 psi
Manifold block Speed control thumbscrew
on chopper manifold block
should be turned counter
clockwise until fully opened.
Air valve on gun handle not
activated by trigger bar Squeeze trigger to full “on”
position to move poppet
stem to “on” position.
Trigger must depress
poppet stem 1/8” for full
“on” of air to Chopper.