Pressure Control; Motor; Displacement Pump - Graco 231–034 Instructions And Parts List

Pressure Control

The pressure control includes an ON/OFF switch for
the sprayer, the pressure–adjusting control knob, a
pressure–sensing device and a current–overload cir-
cuit breaker with a manual–reset button. The pressure
control regulates the motor speed.

Motor

The DC motor has sealed bearings and replaceable
motor brushes. The motor operates whenever there is
a demand for fluid or additional fluid pressure. When
the pump is cycling, the motor sounds like the cranking
of an automobile starter. When the pump is not cy-
cling, the motor hums intermittently until the fluid pres-
sure stabilizes, then the motor will shuts off. However,
there is still power to the sprayer and the sprayer stays
pressurized and ready to use until you manually shut it
off and relieve the pressure.
The direct–current (DC) motor is less sensitive to low
voltage or voltage fluctuations than an alternating–cur-
rent (AC) motor. However, long extension cords may
affect the sprayer performance.
Drive Assembly
The drive assembly, which is sealed, transfers power
from the DC motor to the displacement pump.
73
67
66
61
76
100
E
102
D
Fig. 1
Introduction
A
B
C
75
74
66b
40
101

Displacement Pump

The displacement pump provides equal fluid delivery
on both the up and the down pump stroke strokes. The
pump has a packing nut which, when filled with Graco
Throat Seal Liquid T(SL), helps prevent damage to the
throat packings and piston rod.
Fluid Filter
The fluid filter strains the paint to help avoid clogs in
the hose and the spray tip. The filter includes a reus-
able element and has a pressure drain valve for manu-
ally relieving fluid pressure.
Hoses
The grounded, nylon spray hoses have spring guards
on both ends. The 50 foot (15.2 meter) hose has a 1/4
inch ID. The 3 foot (0.9 meter), 3/16 inch ID hose pro-
vides more flexible gun movement. The nylon hose
material acts as a pulsation dampener to absorb pres-
sure fluctuations.
Spray Gun & RAC IV DripLess Tip Guard
The spray gun has a trigger safety which prevents ac-
cidental triggering when it is locked. The gun has a
filter for final paint–straining. The Reverse-A-Clean IV
(RAC IV) SwitchTip uses high pressure fluid to remove
clogs from the spray tip without removing it from the
gun. The RAC IV DripLess tip guard is a safety feature
which helps reduce the risk of a skin injection injury.
KEY
40 Nipple, for second hose
61 Pail hanger
66 Fluid Filter
66b Nipple, for the main fluid hose
67 Drive Assembly
73 Motor
74 Pressure drain valve
75 Pressure control
76 Displacement pump
100 Main fluid hose
101 Whip hose
102 Contractor gun
A Reset button
B On/OFF switch
C Pressure Adjusting Knob
D SwitchTip
E RAC IV tip guard
F Trigger safety shown locked