Troubleshooting - Graco Dispensit 1230 Instructions Manual

Although good housekeeping, preventive maintenance and proper operating procedures will lengthen the
life of the valve, all mechanical devices will develop problems from normal wear. Following are some of
the possible difficulties and likely causes that may arise with the valve. If these do not correct the situation,
call the technical service department at Dispensit®.
Problem Possible Cause
Nothing Happens 1. Pneumatic or electrical problems with the
controller or controlling device.
2. Foot switch or cycle start switch are not
working properly.
3. Valve is locked up.
1. Material line is closed off at the valve.
Valve Cycles but
Material is Not
Dispensed 2. Low air pressure on the material transfer
system.
3. Low material pressure setting on material
transfer system.
4. Material is cured in the needle or needle
block.
5. Not enough M.R. stroke
Irregular Dispense 1. Inconsistent material (cured, dried, or
separated)
2. Air in the material.
3. Valve is cycling too fast, not allowing the
metering rod chamber to fill.
4. Cycle timing on the controller or
controlling device is improperly set.
Sluggish Cycle Time 1.Pistons and/or cylinder walls are poorly
lubricated.
Valve Drools 1. Air in the material.
2. Worn Metering Rod.
3. Worn seals.
4. Worn diaphragm.
1. Wrong material for this particular valve
Dispense Valve is
design.
Locked Up
2. Oil buildup on cylinder walls from air
supply.
3. Too low air pressure on valve.
Material build upon 1. Material getting past the upper seal due to
metering rod. a lack of fluid in the wet cup.

Troubleshooting

18
Solution
1. Have the controller or controlling devices
checked and serviced as needed.
2. Have the foot switch or cycle start switch
checked and serviced as needed.
3. See problem "Valve Locked Up" below.
1. Open any "in-line" restrictions so material
flows smoothly to the dispense valve.
2. Adjust air pressure to proper determined
setting, which is needed to dispense the
material involved.
3. Adjust material output pressure to proper
determined setting, which is needed to
dispense the material involved.
4. Replace the dispense needle with a new
one.
5. Increase the stroke of the Metering Rod to
get more material.
1. Replace the material supply.
2. Replace the material supply.
3. Controller timing needs to be adjusted.
4. Adjust as needed, as per manufacturers
recommendations.
1.Disassemble the Drive Cylinder Assembly
and the End Cap Assemblies, lubricate, align,
and reassemble.
1. Replace the material supply.
2. Replace Metering Rod.
3. Rebuild valve with a new seal kit.
4. Replace the diaphragm.
1. Make sure the wetted components and
spool/sleeve assembly are compatible with
material. Refer to p5-2, "Optional Equipment".
2.Disassemble, clean and/or rebuild valve.
Use only NON-lubricated air with this valve.
3. Increase air pressure.
1. Rebuild the valve and pay special attention
to the metering rod.