Graco PT2500 - Manual (Page 14)

14 820-133
Maintenance
Lubricate the Inlet Valve. See Fig. 9.
1. Follow the Pressure Relief Procedure on page 11.
Remove the inlet screen.
2. Turn the sprayer over. Press down lightly on the stem
(A) of the inlet valve (26) with a small screwdriver.
Pour about a teaspoon of mineral spirits or solvent
into the valve, then remove the screwdriver.
3. Set the sprayer upright. Increase the pressure con-
trol setting half way. Turn on the sprayer for a few se-
conds, then turn it OFF.
4. Now tighten the paint pump screws (25) and the inlet
valve (26).
Tighten the Paint Pump Screws and Inlet Valve
See Fig. 10.
1. Follow the Pressure Relief Procedure on page 11.
2. Torque the four screws (25) on the paint pump to
170–200 in–lb (19–23 N.m).
3. Torque the inlet valve (26) to 320–360 in–lb (36–41
N.m).
Check and/or Change the Hydraulic Oil
See Fig. 11.
1. Follow the Pressure Relief Procedure on page 11.
2. Remove the fill cap (5). The oil should be 1 inch (25
mm) from the top of the plate. If the oil is low, add oil
as necessary. use only Graco lightweight hydraulic
oil, part no. 218–797. Reinstall the fill cap, hand tight,
if you are not going to change the oil.
3. To change the oil, turn the sprayer over and drain the
oil through the fill cap hole.
CAUTION
Whenever you remove the fill cap, be very careful not
to let any dirt, paint particles, or other contaminants
get into the hydraulic system. Contaminants can
cause damage to the hydraulic system.
4. Fill the hydraulic pump housing with 16.5 ounces (55
ml) of Graco lightweight hydraulic oil. Reinstall the fill
cap.
5. Plug in the sprayer. Turn the pressure control knob
(4) fully counterclockwise (no pressure). Turn on
the sprayer and let it run for two minutes to fill the hy-
draulic system. Increase the pressure to maximum
and turn the sprayer on and off four times to help rid
the hydraulic system of air.
Fig. 9 0272
22
26
A
Fig. 10 0273
1
3
2
Lubricate the threads.
Torque to 170–200 in–lb (19–23 N.m)
Torque to 320–360 in–lb (36–41 N.m)
22
26
25
1 2
1 3
Fig. 11
25 mm
(1 inch)
0269
5
4