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Repair
312068M 3
Repair
Flushing
• Flush out old fluid with new fluid, or flush out old
fluid with a compatible solvent before introducing
new fluid.
• Use lowest possible pressure when flushing.
• To flush entire system, circulate through gun fluid
manifold (with manifold removed from gun).
• Always leave some type of fluid in system. Do not
use water.
Pressure Relief Procedure
1. Select Park on Pump Control Switch if available, or
turn off.
2. Turn off feed pumps.
3. Trigger gun to relieve pressure.
4. Close gun inlet valves.
5. Close fluid supply inlet valves.
6. Service spray gun. See corresponding spray gun
manual.
Preventive Maintenance
When pumps are functioning properly, it is not unusual
for a trace amount of resin to seep past the pump pack-
ing onto the resin pump shaft. Routinely inspect shaft
and wipe away any residue when the proportioner is
turned off. Disassemble and clean the proportioning
pumps annually. For pumpline P7758-255773, disas-
semble and clean the proportioning pumps every six
months. Inspect the pistons and cylinder for marks or
scratches, which may cause leakage and damage to
packings. Replace all packings, o-rings, and bushings
annually. For pumpline P7758-255773, replace these
items every six months.
Flush equipment only in a well-ventilated area. Do not
spray flammable fluids. Do not turn on heaters while
flushing with flammable solvents.
Trapped air can cause the pump to cycle unexpectedly,
which could result in serious injury from splashing or
moving parts.