Rapid-Air AIR FEED / CUT-TO-LENGTH WITH KEYPAD - Manual (Page 19)

18
PROBLEM
Feed and stock clamps work, but
slide block does not move when
actuating valve is depressed.
Excessive leakage of air from
exhuast hole beneath speed
adjusting screw when acutating
valve is in up position.
Excessive leakage of air from
exhuast hole, also sluggish
operation of feed clamp pistons,
acuating valve up.
Excessive leakage of air from
exhaust hole when actuating
valve is in down position. (Note:
that a slight amount of leakage is
normal in this position.)
Stock clamp does not move up
and down when actuating valve is
depressed. Other operations
appear normal.
Excessive leakage of air from
actuating valve vent hole when
actuating valve is in up position.
Gradually reduced speed.
Excessive leakage of air from
pilot operated valve vent hole on
side of feed.
Cushion pistons act too slow and
provide too much cushion
Mist of oil coming from exhaust
hole POSSIBLE CAUSES
*Pilot operated valve is stuck
* Poppet not seating on bottom of
valve hole.
*Leaking of “O” rings #85, 83, 84,
88, 90 and 100
*Leaking of “O” rings #85 and 90
*Tight “O” rings or grit around
pilot operated valve may prevent
it from moving its full stroke.
*Worn poppet.
*Poppet in backwards
*Worn “O” rings $96 around O.D.
of stock clamp pistons.
“O” Rings #103 beneath actuating
valve retainer #31C is leaking.
*Lack of oil
*Low viscosity oil.
*Speed adjusting screw turned in
too far.
*Oversized poppet.
*Leaking of “O” rings #100, 101 or
102.
*Excessive oil, reduce supply
*Excessive oil, reduce supply REMEDY
*Check for grit, swollen nylon or
swollen “O” rings
*Check for grit or chips
*Check “O” rings #85, 83, 84, 88,
90 and 100. See assembly
drawing 106 for location
*Check “O” rings #85 and 90.
See assembly drawing #106 for
location.
*Clean grit, cycle feed manually
to break in “O” rigns.
*Insert new poppet
*See feeds parts list #106 for
correction orientation.
*Replace “O” rings. See
assembly drawing #106 for
location.
*Install “O” rings beneath
retainer - not in air groove. See
assembly drawing #106.
*Adjust air/oil mixture.
*Use lighter weight oil
*Readjust screw
*Clean poppet area; check for
free fit
*Check “O” rings #100, 101 and
102. See assembly drawing #106
for location.
*Adjust air/oil mixture
*Adjust air/oil mixture
Con’t next page
Characteristics and Possible Causes of Troubles with
Rapid-Air Feeds