Maintenance
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3A6939B
Maintenance
Preventive Maintenance
Schedule
The operating conditions of your particular system
determine how often maintenance is required. Establish
a preventive maintenance schedule by recording when
and what kind of maintenance is needed, and then
determine a regular schedule for checking your system.
Your schedule should include the maintenance activities
described in the following sections.
Flushing the Fluid Supply Lines
•
Flush before changing colors, before fluid can dry in
the equipment, at the end of the day, before storing,
and before repairing equipment.
•
Flush at the lowest pressure possible. Check con-
nectors for leaks and tighten as necessary.
•
Flush with a fluid that is compatible with the fluid
being dispensed and the equipment wetted parts.
Checking the Mix Tank Volume
Checking the Hydraulic Power Supply
Carefully follow the hydraulic power supply manufac-
turer's recommendations on reservoir and filter cleaning,
and periodic changes of hydraulic fluid.
Performing a Stall Test
Perform a stall test periodically to ensure the piston seal
is in good working condition and to prevent system pres-
surization:
Close the fluid shutoff valve (D) closest to the pump on
the down stroke and be sure that the pump stalls. Open
the fluid shutoff valve to restart the pump. Close the fluid
shutoff valve (D) closest to the pump on the upstroke
and be sure that the pump stalls.
Stop the pump on the down stroke, before the air motor
changes over.
To avoid fire and explosion, always ground equipment
and waste container. To avoid static sparking and
injury from splashing, always flush at the lowest pos-
sible pressure.
NOTICE
Don't let the mix tank run dry. When the tank is empty,
the pump demands more power as it tries to suck in
some fluid. This causes the pump to run too fast,
which can seriously damage the pump.
NOTICE
Do not allow the pump to run quickly for a long period
of time as this may damage the seals.
