Preventive Maintenance 5-5
5. Unscheduled maintenance
General maintenance
System cleaning
1. Clean the filter (customer-supplied) to the air regulators for the pump
and guns.
2. Carefully clean the inside of the electrical enclosure with pressurized
dry air. Take care not to damage or dislodge any components inside
the enclosure.
3. Ensure that all electrical connections and terminal blocks are secure.
4. Check for leakage around the hose connections to the service block
and applicator manifold. If leakage is found, replace the O-ring in
accordance with the instructions provided in Section 7, Disassembly
and Repair.
The entire hot melt application system must be flushed periodically to
remove excess dirt and charred material. The following procedure
should also *be used if the adhesive in the system is changed and the
old and new adhesives are incompatible.
WARNING: Risk of burns. Wear protective clothing/safety
goggles/gloves (P/N 902 514) during the following procedure.
1. Reduce the pump air pressure to zero (0) at the regulator.
2. Trigger the gun(s) until the system has been relieved of all
pressurized molten material.
a
0
WARNING: Before performing the next step, be sure that all
system pressure has been relieved to avoid the spraying of
molten material.
3. Place a pan or other suitable waste container under the drain valve.
with the system at operating temperature, open the manifold drain
valve.
,
4. Reduce the gun air pressure to zero (0) at the regulator.
5. With the unit at operating temperature, increase pump air pressure
and remove all adhesive from the system in one of the following
ways:
a. Remove a nozzle from its gun and pump the adhesive out through
the gun.
b. Or, open the manifold drain valve and pump the adhesive into a
suitable waste container.
c. Or, disconnect a hose hydraulically (but not electrically) from a
gun and pump the adhesive into a suitable waste container.
a
cl
WARNING: If the guns are removed from the hoses, the
sockets on the hose quick disconnects are electrically
energized with full voltage. Contact with these pins can
cause equipment damage or severe electrical shock.
d. Or, disconnect a hose from its gun hydraulically and electrically,
making sure to replace the dust cover over the electrical
receptacle on the hose. After the dust cover is on, pump the
adhesive into a suitable waste container.
CB Nordson Corporation 1994
All Rights Resefved
PIN 106 701A
41.23OSP - Issued It94
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