6.6 POP TOP FEA TURE NOT FUNC TIONING COR RECTLY
NO.
SYMP TOM
PROB A BLE CAUSE
COR REC TION
1
Cru ci ble cover (Top) does not go up.
(a)Air pres sure is too low.
(a) Check and ad just air pres sure.
(b) Elec tri cal sig nal not get ting to air so le -
noid valve.
(b) Check and cor rect sig nal problem.
(c) Air so le noid valve is not func tion ing
prop erly.
(c) Check valve for proper func tion and re -
place if necessary.
(d) Cru ci ble cover may be stick ing.
(d) Check for mis align ment or bind ing of
the push rods. Ad just as needed.
Check for de bris caught be tween the
cover and coil hous ing or push rods and
coil hous ing. Clean as needed.
Check for stick ing be tween the cover and
the coil hous ing. Add a small amount of
molybdenum disulfide to ar eas that show
sign of stick ing.
2
Cru ci ble cover (Top) does not go down.
(a) Air pressure is too low.
(a) Check and ad just air pres sure.
(b) Elec tri cal sig nal not get ting to Air so le -
noid valve.
(b) Check and cor rect sig nal problem.
(c) Air valve so le noid is not func tion ing
properly.
(c) Check valve for proper func tion and re -
place if nec es sary.
(d) For eign ob ject be low source (spi der
plate) which is pre vent ing mech a nism
from low er ing.
(d) Re move for eign ob ject.
3
Cru ci ble cover (Top) goes up only part
way.
(a) Bel lows is damaged.
(a) Check for cor rect con nec tion of the air
lines.
Note: Ap plying air pres sure to the vent will
dam age the bel lows. Check for mis align -
ment of com po nents. Cor rect prob lem and
re place bel lows.
4
Cru ci ble cover (Top) goes down only part
way.
(a) Bel lows is damaged.
(a) Check for cor rect con nec tion of the air
lines.
Note: Ap plying air pres sure to the vent will
dam age the bel lows. Check for mis align -
ment of com po nents. Cor rect prob lem and
re place bel lows.
(b) For eign ob ject be low source (spi der
plate) which is pre vent ing mech a nism
from low er ing.
(b) Re move for eign ob ject.
Troubleshooting
6-10
0101-9004-0A
STIH-270-2PT
