Maintenance - Graco PT2500 Instructions And Parts List

CAUTION
Thorough flushing and proper maintenance are
essential to keep the sprayer working properly
and avoid costly damage to the sprayer or the
object being sprayed.
Diaphragm Failure: Always replace the diaphragm
after every 500 hours of operation (once every 4 to
6 months). The diaphragm weakens with use. If it
ruptures, hydraulic oil and paint may mix, damaging
the sprayer and/or the surface of the object being
sprayed may be damaged.
Follow the Maintenance Intervals outlined below.
MAINTENANCE INTERVALS
Flushing
Lubricate Intake Valve
Tighten Paint Pump
Screws and Inlet Valve
Check and/or Change
Hydraulic Oil
Replace Diaphragm
Flushing Procedure
1. Shut off the sprayer. Engage the gun trigger safety
lever. Open the bypass valve ONE turn counter-
clockwise. Raise the paint pump just above the
paint and turn on the sprayer to drain the paint. Now
turn off the sprayer. See Fig 7.
2. Place the paint pump in a grounded flushing pail of
solvent.
3. Check to be sure the trigger safety lever is set. Re-
move the spray tip from the gun. Disengage the safe-
ty lever. Hold a metal part of the gun firmly to the side
of a grounded metal pail. Close the bypass valve.
Trigger the gun into the pail. Turn on the sprayer.
Watch the side of the pail for solvent to appear. Then
release the gun trigger. Turn off the sprayer.
4. With the bypass valve closed, turn on the sprayer,
trigger the gun into the flushing pail and allow the sol-
vent to circulate through the hose and gun for two to
three minutes, using the lowest possible pressure.
See Fig 8. Release the gun trigger and engage the
safety lever. Turn off the sprayer.

MAINTENANCE

Immediately after each use
Immediately after each use
1. After first 3 to 5 hours
of operation
2. After next 3 to 5 hours
of operation
3. Each 25 hours thereafter
(about weekly)
1. Check the oil after each
use of the sprayer
2. Change the oil after first
20 hours of operation
3. Change the oil each 50
hours thereafter (about
twice monthly)
After every 500 gallons of
paint sprayed (4 to 6 months)
PRESSURE
CONTROL
KNOB
OPEN
COUNTER-
CLOCKWISE
BYPASS
VALVE
CLOSE
CLOCKWISE
Fig 7
MAINTAIN FIRM
METAL–TO–METAL
CONTACT BETWEEN
GUN AND CONTAINER
Fig 8
5. Open the bypass valve ONE turn counterclock-
wise.
6. Raise the paint pump above the solvent, turn on the
sprayer, and allow the pump to run itself dry. Turn the
sprayer OFF.
7. Using a clean pail of water or solvent, and the lowest
possible pressure, flush again to be sure all paint par-
ticles are removed.
8. Remove the paint strainer and clean it thoroughly.
9. Now lubricate the inlet valve. See page 14.
MAINTENANCE PROCEDURE
NEXT P AGE
ON/OFF SWITCH
DECREASE
Counterclockwise
INCREASE
Clockwise
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CONTINUED ON