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Operation
Using the Proportioning Pump System
When the system is primed and operating, check the
fluid outlet pressure gauges. Check the gauges fre-
quently while using the system, and note the pres-
sures. These notes will be helpful in analyzing prob-
lems that may occur, as a change in the displacement
pump performance will be indicated by a change in the
pressure gauge readings.
NOTE: A pressure drop does occur during pump
stroke changeover.
WARNING
EQUIPMENT MISUSE HAZARD
To reduce the risk of serious injury,
including fluid injection:
Do not exceed the maximum air and fluid work-
ing pressure of the lowest rated component in
your system.
Always close the air supply valve to the pump
before opening the fluid drain valves to relieve
system pressure. This will reduce the risk of
excessive pressure buildup in the opposite
component hose and fittings.
If a supply container is dry, stop the pump immediately,
and relieve the pressure. Refill the container, and
prime the system. Be sure to eliminate all of the air
from the system.
CAUTION
Do not allow the supply containers to run dry of the
fluid being pumped. A dry container allows air to be
pumped into the system and can cause incorrect
proportioning. One dry displacement pump can
damage the other displacement pump by causing a
pressure rise in the other pump.
Maintenance
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
follow the Pressure Relief Procedure
on page 6 before checking or servicing
any part of the system, whenever you stop spray-
ing, install or clean the spray tip, or are instructed
to relieve the pressure.
Shutdown and Care of the Pump
Stop the pump at the bottom of its stroke to keep fluid
from drying on the exposed displacement rod and
damaging throat packings. Relieve the pressure as
instructed on page 6.
Flushing
Flush the pump with a compatible solvent before the
fluid dries in the pump and hoses. If the pump is to be
stored for any period of time, and you are pumping
water-based fluid, first flush it with water, then with
mineral spirits to protect the pump parts.
1. Relieve the pressure as instructed on page 6,
and remove the spray tip (spray guns or spray
valves only) before flushing.
2. Hold a metal part of the gun/valve firmly to the side
of a grounded metal pail and use the lowest pos-
sible fluid pressure during flushing.
3. Relieve the pressure.
Lubrication
An accessory air line lubricator provides automatic air
motor lubrication. For daily, manual lubrication, discon-
nect the regulator; place about 15 drops of light ma-
chine oil in the pump air inlet; reconnect the regulator;
and turn on the air supply to blow oil into the motor.
Corrosion Protection
Water or moist air can cause the pump to corrode. To
help avoid corrosion, never leave the pump filled with
water or air. After normal flushing, flush the pump
again with mineral spirits or oil-based solvent; relieve
the pressure; and leave the mineral spirits in the pump.
