Repair
311391F
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.
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 the pumps are functioning properly, it is not
unusual for a trace amount of resin to seep past the
pump packing onto the resin pump shaft. Routinely
inspect the shaft and wipe away any residue when the
proportioner is turned off. Disassemble and clean the
proportioning pumps annually. Inspect the pistons and
cylinder for marks or scratches, which may cause leak-
age and damage to packings. Replace all packings,
o-rings, expanders, and packing springs annually.
Pump Base Disassembly
Disassemble and clean both pump bases annually.
1. Relieve pressure, page 3.
2. Turn OFF the main disconnect and lock out power at
the source.
3. Remove the outlet valve assembly from the upper
pump base:
a. Unthread and remove the outlet valve retainer
(222) and o-ring (207). See the parts drawing
on page 6.
b. Remove the outlet valve ball (205), using a
magnet.
c. Using the ball seat removal tool (Part No.
296609), loosen and remove the outlet valve
seat (223) by turning it counterclockwise.
d. Remove the valve seat seal (224) from the bot-
tom of the cavity.
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.
