Rapid-Air MULTI-STROKE CONTROL - Manual (Page 6)


feed and stock clamps work, but
slide block does not move when
actuating valve is depressed.
Excessive leakage of air from
exhaust hole beneath speed
adjusting screw when actuating
valve is in up position.
Excessive leakage of air from
exhaust hole, also sluggish
operation of feed clamp pistons,
actuating 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.
troubleshootinG
Problem. .................................Possible.Cause. ..............................................Remedy
– 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.
– 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
for 106 location.
– Check “O” rings #85 and 90. See
assembly drawing for 106 location.
– Clean grit, cycle feed manually
to break in “O” rings.
– Insert new poppet.
– See feeds parts list #106 for location.
– Replace “O” rings. See assembly
drawing #106.
– 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 for #106
location.
– Adjust air/oil mixture.
– Adjust air/oil mixture.