Maintenance Intervals; Flushing Procedure - Graco PT2500 Instructions Manual

CAUTION
Thorough flushing and proper maintenance are
essential to keep the sprayer working properly
and avoid costly damage to the sprayer or the ob -
ject 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 the
diaphragm 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 the intake valve.
Tighten the paint pump
screws and the inlet valve.
Check or change the hydrau-
lic oil.
Replace the diaphragm.

Flushing Procedure

1. Shut off the sprayer. Lock the gun trigger safety le-
ver. Open the bypass valve (66) 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.
Maintenance
Immediately after each use.
Immediately after each use.
1. After the first 3 to 5 hours of
operation.
2. After the 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 the first
20 hours of operation.
3. Change the oil each 50
hours thereafter (about twice
monthly).
After every 190,000 liters of
paint sprayed (4 to 6 months).
3. Check to be sure the trigger safety lever is locked.
Remove the spray tip from the gun. Unlock the safety
lever. Hold a metal part of the gun firmly to the side
of a grounded metal pail. Close the bypass valve
(66). Trigger the gun into the pail. Turn on the spray-
er. Watch the side of the pail for solvent to appear .
Then release the gun trigger. Turn off the sprayer.
4. With the bypass valve (66) closed, turn on the spray-
er, trigger the gun into the flushing pail and allow the
solvent 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 lock the safe-
ty lever. Turn off the sprayer.
Decrease pressure
(counterclockwise).
Increase pressure (clockwise).
Open (counterclockwise).
Close (clockwise).
4
66
Fig. 7
Maintain firm met-
al–to–metal contact
between gun and
container
Fig. 8
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