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Rebound value is
VIII
relatively high.
Rebound value is
IX
relatively low.
Rebound value is
X
unstable, sometimes
high and sometimes low
1.Active length of impact spring 17
is longer than 61.5mm
2. The launching position of
hammer mass 10 is relatively high,
(impact spring17 extends too
long).
3. Hammer guide bar 9 is wiped
with too much oil.
1. The active length of impact
spring 17 is less than 61.5mm;
2. The launching position of
hammer mass 10 is low;
3. The friction of pointer block 22
is relatively high;
4. The shock surface of recoiling
hammer mass 10 is dirty;
5. The friction between recoiling
hammer mass 10 and central guide
rod increases.
1. The shock surface between
recoiling hammer mass 10 and
Impact plunger 14 contacts
unevenly
2. Shock surface or central guide
rod 9 is dirty
3. Hammer guide bar 9 is not
straight
4. The friction between pointer
block 22 and guide rod 26 is
uneven
5. Bad contact between pointer
piece 20 and hammer mass10
6. Pointer block 22 rubs or bumps
hammer body 7 on the groove.
7. Guide rod 26 is curved
Adjust the fixed position of
impact spring 17 on guide
sleeve 11
Twist the adjusting bolt of tail
hood 30 outwardly
Remove recoiling component
elements and clean it with
cotton yarn
Adjust the fixed position of
impact spring 17 on guide
sleeve 11
Screw the adjusting bolt of tail
hood 30 inwardly
Adjust the coordinate
tightness degree between
pointer block 22 and pointer
axis 26, and make then friction
between 0.65±0.15N
Clean the dirt on casting
surface
Wipe the hammer guide bar 9
with appropriate amount of
watch oil or sewing machine
oil.
Turn Impact plunger 14, or
change Impact plunger 14
Clean dirt
Align hammer guide bar 9
Adjust the friction between
pointer sliding block 22 and
guide rod 26
Adjust the size of field angle of
pointer piece 20 appropriately
File and repair flat surface or
shoulder surface of pointer
block 22；file and repair the
long groove of hammer body 7
Align guide rod
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