21
PNEUPAK TROUBLE
SHOOTING GUIDE
1. No air, then turn red sleeve valve on.
2. Make sure that the air regulator (large black
knob on back of panel) is turned on for
pressure to enter system. To be sure enough
pressure is system, check for min. 60 PSI,
otherwise valves might not shift.
3. Recommend 80 to 90 PSI operating pressure.
4. If the unit seems to be covered in oil, or the oil
is dripping out of the mufflers, then turn
lubricator output down.
5. Problems within the complete system can
result if too mush oil is in the air lines and
valves. This could cause the valves not to
shift completely. Recommended oil to be used
as lubricant is a Tellus 32 or ISO32. If oil is
incompatible with Buna-N seals, the seals
may swell and cause the valves and cylinders
to stick.
6. If the pump valve (large Airtec valve) does not
shift during operation or is slow in shifting;
make sure that the two Legris flow controls
are not adjusted right in. If so, then back off.
7. If pump cylinder is too slow then adjust large
Aro flow controls to desired speed.
8. If a leak develops around the air valve 5 bank
manifold; tighten the screws on top of valve
and tighten manifold socket head bolts as
these may loosen over time.
NOTE: Be careful with socket head bolts --- Do
not tighten too much or clamps will bend on
manifold increasing the leak.
9. If pump cylinder cycles one way but not back;
check that the limit valves are actuated to
make sure contact is made and signal is sent
to either port 19 or 26 of the 5 station valve
bank.
10. If cylinder still does not cycle, check or
replace valve 1 & 3 (top and middle valve) of
the 5 station valve bank.
11. If leakage is detected around the selector
switch then check to see if debris is hindering
proper valve actuation. If this is not the case,
then replace the selector switch.
BASIC OPERATION
Single Cycle Operation
Turn the selector switch to the single cycle. It will
then do the following when the start switch is hit:
■ Shifts valve No. 2 second from the top which
turns off valve No. 1 and takes the signal
away from Pt. 24.
■ Single cycle valve is now turned on. It gives a
one shot of air to valve No. 3 which shifts, and
turns on Group A.
■ The pump valve now shifts (Airtec Valve) Pt. 1
and valve No. 4 & 5 shifts Pt. 11 &12. This
actuates Air Cylinder & Rotary Actuator.
■ When the pump reaches its full stroke, it hits
LV1. This shifts valve No. 3 back through Pt.
19 which turns on Group B which shifts the
pump valve (Airtec Valve) at Pt. 2 and shifts
the valves NO. 4 & 5 back through Pt. 22 & 23
which actuates the Air Cylinder and Rotary
Actuator to complete the single cycle.
Constant Pumping Path:
Turn the selector switch to constant pumping
cycle. It will then do the following when the start
switch is hit:
■ Valve No. 2 shifts which in turn shifts valve
No. 1 through Pt. 31. This turns on valve No. 3
through Pt. 24 if LV2 is actuated which turns
on Group A.
■ The pump valve now shifts (Airtec Valve) Pt. 1
and valve No., 4 & 5 shifts Pt. 11 & 12 to
actuate Air Cylinder and Rotary Actuator.
■ When pump reaches the full stroke it hits LV1.
This shifts back Valve No. 3 through Pt. 19
which turns on Group B which shifts pump
valve (Airtec Valve) at Pt. 2 and shifts back
valve No. 4 & 5 through Pt. 22 and Pt. 23
which actuates the Air Cylinder and Rotary
Actuator.
■ When the pump completes the first cycle, LV2
is hit again and turns valve No. 1 back on and
shifts valve No. 3 again through Pt. 24 and
starts another cycle all over again.
■ This will continue until the selector switch is
turned off which turns off the air to valve No. 2
and stops supplying valve No. 1, which will
not turn on valve No. 3 to start another cycle.