Bedienungsanleitung Durkopp Adler 528 (Seite 17 von 34) (Englisch)

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Trouble

1. Machine runs with difficulty.

2. Machine starts with slow running.

3. Upper thread tearing.

4. Lower thread tearing.

5. Skipping of stitches.

6. Needle breaking.

Cause

1.1 Machine out of use for certain time,

dried oil and dirt in bearings.

2.1 Insufficient tension of the belt from

electic motor.

3.1 Thread guides incised.

3.2 Sharp hook point.

3.3 Bad feeding.

3.4 Incorrect guiding or upper thread

threading.

3.5 Excessive thread tension.

3.6 Needle incorrectly mounted or da-

maged.

3.7 Thread thickness does not anwer

the thickness of sewn material.

3.8 Machine excessively dirty.

3.9 Thread wound up on the hook.

3.10 Thread too thin or insufficiently

resistant.

4.1 Incorrect threading of the thread

in the bobbin case.

4.2 Thread too weak or insufficiently

resistant.

4.3 Thread incorrectly wound up on the

hook bobbin.

4.4 Bobbin damaged.

4.5 Sharp pressure spring on the bob-

bin case.

5.1 Needle incorrectly mounted.

5.2 Needle blunt or bent.

5.3 Hook point incised or broken.

5.4 Big needle hole in throat plate.

5.5 Broken adjusting spring for ten-

sioning upper thread.

5.6 Needle bar too high or too low.

5.7 Hook overrun, incorrect timing ad-

justment.

5.8 Dirty hook mechanismus.

6.1 Feeder too high.

Method of troubleshooting

Inject some drops of kerosene into all

oiling holes and on sliding surfaces and

put the machine in quick running to clean

out the oiling holes in the bearings. Lu-

bricate then the machine with oil for sew-

ing machines according to par. 7, part A.

Tension the belt according to par. 5.1.2,

part B.

Check up and replace the guides.

Repair.

Set tension according par. 3; 6; 7, part C.

Thread upper thread according to par.

6.1, part A.

Set tension according par. 6.4, part A.

Replace needle according to par. 6.3,

part A.

Use more suitable thread.

Unscrew throat plate and clean out te

machanism. Remount the throat plate

according to the par. 5, part C.

Remove thread.

Use a more suitable thread.

Thread correctly the thread according to

par.. 6.5, part A.

Use a more suitable thread.

Rewind the bobbin.

Replace bobbin.

Replace spring.

Insert correctly needle according par. 6.3,

part A.

Replace needle accordingd to par. 6.3,

part A.

Replace hook.

Replace throat plate and mount it accord-

ing to par. 5, part C.

Replace spring and set upper thread ten-

sion according to par. 6.4, part A.

Set according to par. 10, part C.

Adjust hook timing according to par. 11,

part C.

Clean out with kerosene and lubricate

with oil.

Set the feeder height according to par. 3,

part C.

Operating instructions for eventual trouble shooting

Note: When the machine is driven by a stop motor, it is indispensable to check up, before starting its repair, the setting of its

parameters according to Instructions for assembling, part B, par. 12.5.2.

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