Operating Instructions For Eventual Trouble Shooting - Duerkopp Adler 528 Instruction Manual

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.
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.

Operating instructions for eventual trouble shooting

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.
13
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.