Graco PT2500 Instructions-Parts List Manual page 3

Decrease the pressure (counterclockwise).
Increase the pressure (clockwise).
Open the valve (counterclockwise).
Close the valve (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 Outlet valve
66 Bypass valve
67 Outlet
101 Paint hose
102 Spray Gun
101
102
B
Motor
The sprayer has a 1/2 hp, 120 V, 60 HzAC, 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 side of the mo-
tor. 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 the pressure and
counterclockwise to decrease the 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 Model 218–501. This 25 foot (7
m) hose has a 1/4 inch 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 supplied with Model 218–501 (102) has a
tough, lightweight plastic body. The gun has a trigger
safety lever which prevents accidentally 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 10). The RAC IV includes a safety tip guard which
helps reduce the risk of a fluid injection injury. A No. 215
spray tip for use with latex paint is also includes.
A
59
11