Graco PT2500 - Manual (Page 3)

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KEY
A
Hydraulic pump
B Rac IV DripLess tip guard
and spray tip
4 Pressure control knob
5 Hydraulic oil fill cap
11 ON/OFF switch
18 Motor
21 Diaphragm
22 Paint pump
27 Strainer
59 Drain tube
66 Bypass valve
67 Outlet
101 Paint hose
102 Spray Gun
59
0266
0267
0270
27
66
4
63
A
5
102
101
B
18
11
21
22
1
3
4
2
Decrease pressure (counterclockwise).
Increase pressure (clockwise).
Open (counterclockwise).
Close (clockwise).
1
2
3
4
1
3
4
2
Decrease pressure (counterclockwise).
Increase pressure (clockwise).
Open (counterclockwise).
Close (clockwise).
Motor
The SHERWIN-WILLIAMS PT2500 Sprayer has a 1/2
HP, 120 V, 60Hz AC, single phase, 1725 rpm motor
(18). The motor is supplied with a three-wire power
supply cord and a three-prong plug. The sprayer ON/
OFF switch is located on the box on the side of the
motor. The motor’s function is to drive the hydraulic
pump. The motor runs continuously when it is turned
on to keep the paint at the desired pressure.
Paint Pump
The paint pump (22) is immersed directly into a 5 gal-
lon paint pail, so the pump is actually being pressure
fed without the mess and trouble of pouring paint into a
hopper.
Hydraulic Pump
The hydraulic pump (A) is located inside the hydraulic
reservoir. The motor drives an eccentric bearing which
pushes the piston in and out of the hydraulic pump.
The pump reciprocates the hydraulic fluid to operate
the diaphragm.
Diaphragm
The diaphragm (21) separates the hydraulic and paint
portions of the paint pump. Hydraulic oil causes the
diaphragm to move up and down almost 30 times per
second, no matter what pressure you are spraying at.
Pressure Control Knob
The paint pressure is regulated by turning the pressure
control knob (4) clockwise to increase pressure and
counterclockwise to decrease pressure.
Bypass Valve
The bypass valve (66) has two functions: (1) to assist
in priming the paint pump during initial startup, and (2)
to provide positive relief of paint pressure from the
gun, hose and sprayer.
Paint Hose
One electrically conductive nylon paint hose (101) is
supplied with the sprayer. This 7 m (25 ft.) hose has a
6 mm (1/4 in.) ID, 1/4 npsm(f) couplings and spring
guards on both ends.
Spray Gun, Reverse-A-Clean (RAC) IV Tip Guard
and Spray Tip
The spray gun (102) has a tough, lightweight plastic
body. The gun has a trigger safety lever which pre-
vents accidentally triggering the gun when the lever is
set in the safe position. (See WARNINGS, page 4.)
The Reverse-A-Clean IV Tip Guard (B) uses high pres-
sure fluid to unclog the spray tip without removing it
from the gun. (See page 12.) The RAC IV includes a
safety tip guard which helps reduce the risk of a fluid
injection injury. A No. 413 spray tip for use with latex
paint is also included.