Manual

Maintenance and Service 31
Inspection and Cleaning of Disassembled Parts
CAUTION! Protect the Solenoid Valve, Heater, and Seat Extension from contact with coating
material, and incompatible cleaning solutions or solvents. Contamination could
cause premature DispenseJet failure.
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NOTE It is recommended that you replace o-rings and u-cup seals rather than clean them. New or
clean o-rings must be treated with an o-ring lubricant.
To inspect and clean the disassembled components and parts:
1. Clean the needle, spring retainer and the seal lock nut thoroughly and inspect for cleanliness,
damage, and wear and tear. Replace as needed.
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NOTE Make sure to clean all threaded holes and body cavities thoroughly, and inspect for
cleanliness, damage, wear and tear. If the needle has a worn tip or has polished
metal streaks, replace it and the seat extension.
2. Clean the upper body and lower body exterior and interior cavities thoroughly and inspect for
cleanliness, damage, and wear and tear. Replace as needed.
3. Clean the connector, plug, fitting, compression spring, cap, micro-adjustment, preload screw,
preload lock nut, standard nozzle nut, and the co-axial air nozzle nut.
4. Clean the seat extension thoroughly and inspect for cleanliness, damage, and wear and tear.
Replace as needed.
5. Clean the solenoid valve by wiping it with a dry disposable towel.
6. Clean the heater by wiping it with a dry disposable towel.
7. If electrical problems are indicated in the Troubleshooting section, use a multimeter to check the
solenoid valve, co-axial air solenoid valve, and the heater. Replace as needed.
Reassembly of the DispenseJet
The following instructions are for the preferred order of reassembly of parts disassembled during the
complete service overhaul. Refer to “Purging the DispenseJet” earlier in this section when reassembling
other parts.
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NOTE The DispenseJet should be assembled on a flat surface using appropriate tools and
materials. Ensure all replacement parts are on hand before beginning.
CAUTION! Do not subject the electrical cables to stress during reassembly. Damaged cables
cannot be replaced separately and can only be replaced with the next higher
assembly.
CAUTION! Do not re-use a removed u–cup seal. Handle new o-rings and seals carefully. If
o-rings or seals are damaged, leakage or premature DispenseJet failure may occur.