Table of Contents
Advertisement
Problem
Logic Circuit
Pumps remain in forward position
and will not return
Pumps remain at rest in rear position
and do not move when the machine
is signaled to start.
Pump air cylinder erratic/will not fin-
ish stroke.
Motionless Mixer (after satisfactory startup)
Patch or uncured spot in mixed
material
Partially unmixed material through
cycle
Material leaks past inlet valves of
dispense valve, mixing block, or dis-
pense block
313937A
Cause
Proximity switch not sensing the trip
plate. Switch roller position may
need adjusting.
Proximity switch faulty.
4-way air cylinder directional control
valve needs servicing or replace-
ment
The Start device
4-way air cylinder directional control
valve needs servicing or replace-
ment
Main signal not coming from rear air
cylinder pilot valve.
Material cured on piston rod.
Input air pressure to machine
exceeds 110 psi.
Pumps not starting together (phas-
ing)
Ratio off.
Mixer not clean or free
Inlet valve o-ring or seals damaged
or worn.
Troubleshooting
Solution
If proximity switch is working prop-
erly, the lamp will illuminate.
If lamp does not work, adjust the
proximity switch by loosening the
mount screws and adjust to 0.062 in.
from the trip plate.
If the lamp still does not work, con-
tact Technical Service or replace.
If proximity switch does not return
the pumps, check the signal through
to the 4-way valve. If ok, then the
4-way valve may be at fault.
Check for incoming and outgoing air
flow. Check that signal comes out of
starting device when machine is sig-
naled to start. If not, starting device
is faulty.
If main input air signal comes from
the starting device, then the 4-way
control valve is not changing over.
Remove and service. (Ask for Tech-
nical Service)
Check main air input to this valve. If
ok, then air cylinder valve is suspect
and requires servicing.
Clean piston rod, and apply mesa-
moll.
Place air regulator in supply line to
machine.
See Pumping troubleshooting.
Check phasing.
Perform Ratio Check procedures.
Dismantle and clean or replace.
Replace o-rings or seals.
19
Advertisement
Table of Contents
