Duerkopp Adler 743-121 Service Instructions Manual page 15

Removing the Knives
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Screw out screws 4 and 5 and remove the cover plate 8 and the
knife guide plate 7.
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Remove the movable knife 3 downward out of the knife guide
plate.
This is necessary so that the knife is not damaged.
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Loosen screws 18 and remove the fixed knife 2.
Installing the Knives
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Screw on the fixed knife 2 with the pressure plate 17.
The distance from the knife edge to the edge of the guide plate is 3
mm.
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Loosen pressure screw 15.
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Insert the movable knife 2 into the knife guide plate 7from the
bottom.
Check the knife for ease of movement.
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Tighten pressure screw 15 and set for the cutting pressure.
The sewing threads are to be securely cut with the least pressure
possible. Conduct a cutting trial (see also the section on function
testing).
The screw is slotted at the bottom. It can be spread slightly for a
decure seating.
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Put on the knife guide plate 7.
The collar 16 must catch in cylinder 10.
Pin 12 must catch in hole 14.
Pin 11 must catch in the slot in the movable knife.
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Put on cover plate 8.
The collar 13 must catch in hole 19.
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Tighten screws 4 and 5.
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Setting the height of the movable knife 2.
The height of the movable knife is set with screw 9. If screw 9 has
been screwed out it is to be reinserted with PTFE tape and
screwed in to its old position.
the movable knife is to be set so that its cutting edge lies just
below the cutting edge of the fixed knife.
Replacing the piston
The movable knife is lifted pneumatically.
The piston which operates the knife is to be found in the trimmer body.
ATTENTION !
The running face of the hole is anodized.
The anodic layer should not be damaged when replacing the piston !
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Remove securing ring 20.
ATTENTION !
Disk 21 is under pressure !
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Remove disk 21, pressure spring 22 and piston 23 with O-Ring 24.
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Lubricate the running face of the hole with ESSO fluid grease
S420.
(DÜRKOPP ADLER AG Order no.: 0791 000304).
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Piston assembly is in the reverse order.
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Conduct a cutting trial with sewing threads (testing program).
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