1/01 E Service Instructions 8
Clutch/Brake
Assembly
Maintenance
Check the air gap annually as
described above and correct with
shims, if required.
Keep the slip rings clean and
grease-free. Clean with fine-grain
abrasive cloth, if necessary. En-
sure proper contacting between
the carbon brushes and the slip
ring to avoid brush sparking.
Remove carbon dust with a brush
(without metal ring).
If the brake or clutch linings are
badly worn out or contaminated
with oil, the armature disk must
be replaced. Before installing a
new armature disk, clean the fric-
tion surfaces of the clutch and
brake rings with white spirit.
After installation, check the air
gaps in conformity with the Table
(Fig. 5).
Protect the asbestos-free friction
linings from oil and grease. Even
when doing installation and set-
ting work, make sure your meas-
uring tools and also your hands
are grease-free.
Caution!
Bring the knife beam to its low-
ermost position prior to dis-
mantling the clutch/brake as-
sembly, as the brake becomes
ineffective when the compres-
sion springs are relieved.
Malfunctions in the
Knife Drive
The following malfunctions may
occur in the knife drive and are
not indicated by the computer
control system as error codes:
• The main motor cannot be
started.
Remedy:
- Switch S56 for "Manual Crank-
ing" (refer to the Operating In-
structions manual) under the fly-
wheel guard is locked. Unlock
the switch.
-The flywheel guard is not prop-
erly closed. Turn in the screw
until the safety switch is closed.
-Defective fuses. Replace the cor-
responding fuses.
• The knife or clamp drive cannot
be started.
Remedy:
-Main motor switched off.
-Defective two-hand control
pushbutton. Replace pushbutton.
-No contact between the carbon
brushes and the slip rings. Refer
to "Clutch/Brake Assembly Main-
tenance".
-Refer to "Malfunctions in the
Hydraulic Clamping System" (flow
indicator).
-Pedal locked (S69).
-Y62 does not make contact or is
defective.
• Heavy jerk when the knife re-
verses at its lowermost position.
Remedy:
- The overload protection device
has become loose. Re-tighten the
overload protection screw. Refer
to "Knife Drive Assembly Over-
load Protection Device" in the
Operating Instructions manual.
- Very dull knives are often the
cause for the responding of the
overload protection ring.
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