Graco PT2500 Instructions Manual page 3

Decrease pressure (counterclockwise). Decrease pressure (counterclockwise).
Increase pressure (clockwise). Increase pressure (clockwise).
Open (counterclockwise). Open (counterclockwise).
Close (clockwise). Close (clockwise).
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
63 Fluid outlet
66 Bypass valve
67 Outlet
84 Paint hose
85 Spray Gun
84
85
B
Motor
The sprayer has a 1/2 HP, 230 VAC, 50Hz, single phase,
1425 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 drives 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 into a 5 gallon 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 dia-
phragm.
Diaphragm
The diaphragm (21) separates the hydraulic and paint
portions of the paint pump. Hydraulic oil causes the dia-
phragm to move up and down almost 30 times per sec-
ond, no matter what pressure you are spraying at.
Sprayer Description
5
4
66
63
18
21
22
27
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 (84) is
supplied with sprayer Model 218–730. This 7 m hose has
a 6 mm ID, 1/4 npsm(fbe) couplings and spring guards
on both ends.
Spray Gun, Reverse-A-Clean (RAC) IV Tip Guard
and Spray Tip
The spray gun (85) has a tough, lightweight plastic body.
The gun has a trigger safety lever which prevents acci-
dentally triggering the gun when the lever is set in the
safe position. (See WARNINGS, page 4.)
The RAC IV Tip Guard (B) uses high pressure fluid to un-
clog the spray tip without removing it from the gun. (See
page 16.) The RAC IV includes a safety tip guard which
helps reduce the risk of a fluid injection injury. A No. 315
spray tip for use with latex paint is also included.
A
59
11