Graco 233776 User manual

1:1 RATIO
TRITONR308
Diaphragm Pump
Used to pump waterborne and solvent–based paints and catalysts.
115 psi (0.8 MPa, 8 bar) Maximum Fluid Working Pressure
115 psi (0.8 MPa, 8 bar) Maximum Air Input Pressure
Part No. 233500 Aluminum Pump, Series D, npt threads
Part No. 233501 Stainless Steel Pump, Series C, npt threads
Part No. 233776 Aluminum Pump, Series C, BSPP threads
Part No. 233777 Stainless Steel, Series C, BSPP threads
U.S. and Foreign Patents Pending
Instructions–Parts List
309303T
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
ti1029a
Part No. 233501 Shown

2 309303
Table of Contents
Safety Warnings 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service
Remove the Fluid and Side Covers 14. . . . . . . . . . .
Ball Check Repair 16. . . . . . . . . . . . . . . . . . . . . . . . . .
Diaphragm Repair 17. . . . . . . . . . . . . . . . . . . . . . . . . .
Air Valve Repair 18. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shaft Repair 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Standard Warranty 26. . . . . . . . . . . . . . . . . . . . . .
Graco Information 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instructions.
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.

309303 3
WARNING
INSTRUCTIONS
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture, malfunction, or start unexpectedly and result
in a serious injury.
This equipment is for professional use only.
Read all instruction manuals, tags, and labels before operating the equipment.
Use the equipment only for its intended purpose. If you are not sure, call your Graco distributor.
Do not alter or modify this equipment. Use only genuine Graco parts and accessories.
Check equipment daily. Repair or replace worn or damaged parts immediately.
Do not exceed the maximum working pressure of the lowest rated component in your system. This
equipment has a 115 psi (0.8 MPa, 8 bar) maximum working pressure at 115 psi (0.8 MPa, 8
bar) maximum incoming air pressure.
Use fluids and solvents which are compatible with the equipment wetted parts. Refer to the Tech-
nical Data section of all equipment manuals. Read the fluid and solvent manufacturer’s warnings.
Aluminum pumps only: Never use 1.1.1–trichloroethane, methylene chloride, other halogenated
hydrocarbon solvents or fluids containing such solvents in pressurized aluminum equipment. Such
use could result in a chemical reaction, with the possibility of explosion.
Do not use hoses to pull equipment.
Route hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose
Graco hoses to temperatures above 180F (82C) or below –40F (–40C).
Wear hearing protection when operating this equipment.
Comply with all applicable local, state, and national fire, electrical, and safety regulations.

4 309303
WARNING
FIRE AND EXPLOSION HAZARD
Improper grounding, poor air ventilation, open flames, or sparks can cause a hazardous condition and
result in fire or explosion and serious injury.
Ground the equipment. Refer to Grounding on page 7.
If there is any static sparking or you feel an electric shock while using this equipment, stop pump-
ing immediately. Do not use the equipment until you identify and correct the problem.
Provide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid
being pumped.
Keep the work area free of debris, including solvent, rags, and gasoline.
Electrically disconnect all equipment in the work area.
Extinguish all open flames or pilot lights in the work area.
Do not smoke in the work area.
Do not turn on or off any light switch in the work area while operating or if fumes are present.
Do not operate a gasoline engine in the work area.

309303 5
WARNING
PRESSURIZED FLUID HAZARD
Spray from the gun, hose leaks, or ruptured components can splash fluid in the eyes or on the skin
and cause serious injury.
Do not stop or deflect fluid leaks with your hand, glove, or rag.
Follow the Pressure Relief Procedure on page 11 before cleaning, checking, or servicing the
equipment.
Tighten all fluid connections before each use.
Check the hoses, tubes, and couplings daily. Replace parts immediately if worn, damaged, or
loose. Permanently coupled hoses cannot be repaired.
TOXIC FLUID HAZARD
Hazardous fluids or toxic fumes can cause a serious injury or death if splashed in the eyes or on the
skin, swallowed, or inhaled.
Know the specific hazards of the fluid you are using. Read the fluid manufacturer’s warnings.
Store hazardous fluid in an approved container. Dispose of the hazardous fluid according to all
local, state, and national guidelines.
Wear appropriate protective clothing, gloves, eyewear, and respirator.
If the diaphragm fails, the fluid is exhausted along with the air.

6 309303
Installation
General Information
Fig. 2 shows a wall mounted HVLP spray applica-
tion. It is only a guide for selecting and installing
system components. Contact your Graco distributor
for assistance in planning a system to suit your
needs.
Always use Genuine Graco Parts and Accessories,
available from your Graco distributor. If you supply
your own accessories, be sure they are adequately
sized and pressure rated for your system.
Use a compatible, liquid thread sealant on all male
threads. Tighten all connections firmly to avoid air
or fluid leaks.
NOTE: On all npt threads, tighten to 2–3 turns past
finger tight.
Reference numbers and letters in parentheses refer
to the callouts in the figures and the parts lists on
pages 23–22.
In a spray system, ventilate the spray booth.
Tightening Threaded Fasteners Before
First Use
See the Service section for torque specifications.
After unpacking the pump, and before using it for
the first time, check and retorque all external fas-
teners.
After the first day of operation, retorque the fasten-
ers.
As a general guideline, retorque fasteners every
two months.
WARNING
FIRE AND EXPLOSION HAZARD
To prevent hazardous concentrations of
toxic and/or flammable vapors, spray
only in a properly ventilated spray booth.
Never operate the spray gun unless
ventilation fans are operating.
Check and follow all of the national,
state, and local codes regarding air
exhaust velocity requirements.
WARNING
TOXIC FLUID HAZARD
Hazardous fluid or toxic fumes can
cause serious injury or death if splashed
in the eyes or on the skin, inhaled, or
swallowed.
1. Read TOXIC FLUID HAZARD on page 5.
2. Use fluids and solvents which are compatible
with the equipment wetted parts. Refer to the
Technical Data section of all equipment manu-
als. Read the fluid and solvent manufacturer’s
warnings.
Mounting the Pump
Mount the pump in a well-ventilated area, with
sufficient clearance on all sides for operator access
and servicing.
Be sure the mounting can support the weight of the
pump, hoses, and accessories, as well as the
stress caused during operation.
The pump may be mounted vertically or horizontal-
ly. Be sure the pump is level in all directions.
Wall, pail, stand, or portable cart mounting kits are
available from Graco. For other mountings, be sure
the pump is adequately secured. The pump has
two mounting holes for 0.35 in. (9 mm) screws. See
the Dimension drawing on page 25.

309303 7
Installation
Grounding
WARNING
FIRE AND EXPLOSION HAZARD
This pump must be grounded. Before
operating the pump, ground the system
as explained below. Also read the sec-
tion FIRE AND EXPLOSION HAZARD
on page 4.
To reduce the risk of static sparking, ground the pump
and all other equipment used or located in the pumping
area. Check your local electrical code for detailed
grounding instructions for your area and type of equip-
ment.
Ground all of this equipment:
Pump: Attach a ground wire (Y) to the pump’s
grounding screw (35) and secure with the screw, as
shown in Fig. 1. Connect the clamp end of the
ground wire to a true earth ground. Order Part No.
238909 Ground Wire and Clamp.
Fig. 1
Y
35
ti1030b
Air and fluid hoses: Use only electrically conductive
hoses.
Air compressor: Follow the manufacturer’s recom-
mendations.
Solvent pails used when flushing: Follow your local
code. Use only metal pails, which are conductive.
Do not place the pail on a non-conductive surface,
such as paper or cardboard, which interrupts the
grounding continuity.
Fluid supply container: Follow your local code.

8 309303
Installation
Air Line
WARNING
A bleed-type master air valve (B) is required in your
system to relieve air trapped between this valve
and the pump. See Fig. 2. Trapped air can cause
the pump to cycle unexpectedly, which could result
in serious injury, including splashing in the eyes or
on the skin, injury from moving parts, or contamina-
tion from hazardous fluids.
1. Install the air line accessories as shown in Fig. 2.
Mount these accessories on the wall or on a
bracket. Be sure the air line supplying the acces-
sories is electrically conductive.
a. The fluid pressure can be controlled in two
ways, either by controlling the air into the
pump with the air regulator (F) or the fluid out
of the pump with the fluid regulator (H).
b. Locate a bleed-type master air valve (B) close
to the pump, to relieve trapped air. See the
WARNING at left. Locate another air valve (E)
upstream from all air line accessories, to
isolate them during cleaning and repair.
c. Install an air line filter (D) to remove harmful
contaminants such as dirt, moisture, and oil
from the compressed air supply.
2. The air valve does not require lubrication.
3. Install an electrically conductive, flexible air hose
(C) between the accessories and the pump air inlet
(T). Use a minimum 1/4” (6.3 mm) ID air hose.
Screw an air line quick disconnect coupler (V) onto
the end of the air hose and screw the mating fitting
into the pump air inlet snugly. Do not connect the
coupler to the fitting yet.

309303 9
Installation
KEY
A TRITON 308 Pump
B Bleed-type master air valve
(required for pump)
C Air supply line
D Air line filter
E Air line shutoff valve
F Pump air regulator
G Gun air regulator (used in spray system only)
H Fluid pressure regulator (used in spray
system only)
J Drain/circulation valve
K Drain tube
L Suction tube
M Pump fluid inlet
N Pump fluid outlet
P Fluid hose (shown connected to gun in spray
system)
R Gun air hose (used in spray system only)
S Spray gun (used in spray system only)
T Pump air inlet
U Agitator (used in spray system only)
V Air line quick disconnect
Y Ground wire
ti1007a
Fig. 2
A
P
Wall Mount HVLP Spray Installation Shown
S
R
C
DE
Y
B
H
J
K
L
V
M
N
T
U
Y
B
F
G
K
J
H
L
ti1020a

10 309303
Installation
Fluid Suction Line
Screw the suction line (L) into the pump inlet (M)
snugly. Use a compatible liquid thread sealant on
connections to prevent air from getting into the fluid
line.
Do not pressure feed this pump.
See the Technical Data on page 24 for maximum
suction lift.
Use an agitator (U) to prevent fluid from settling
out. Part No. 245081 Agitator Kit (accessory) is
available.
Fluid Outlet Line
WARNING
A fluid drain valve (J) is required in your system to
relieve pressure in the hose if it is plugged. See
Fig. 2. The drain valve reduces the risk of serious
injury, including splashing in the eyes or on the
skin, or contamination from hazardous fluids when
relieving pressure. Install the valve close to the
pump fluid outlet. To use the valve as a circulation
valve, connect a tube (K) between the valve and
pail.
CAUTION
Some systems may require installation of a pressure
relief valve at the pump outlet to prevent overpres-
surization and rupture of the pump or hose.
Thermal expansion of fluid in the outlet line can
cause overpressurization. This can occur when using
long fluid lines exposed to sunlight or ambient heat,
or when pumping from a cool to a warm area (for
example, from an underground tank).
Overpressurization can also occur if the pump is
being used to feed fluid to a piston pump, and the
intake valve of the piston pump does not close,
causing fluid to back up in the outlet line.
Use electrically conductive fluid hoses (P). Screw
the fluid fitting into the pump outlet (N) snugly.
Install a fluid regulator (H) at the pump fluid outlet
to control fluid pressure, if desired. See Air Line,
step 1a, for another method of controlling pressure.
Install a fluid drain valve (J) near the fluid outlet.
See the WARNING at left.
Flush the Pump Before First Use
The pump was tested in lightweight oil. If the oil could
contaminate the fluid you are pumping, flush the pump
thoroughly with a compatible solvent. Follow the steps
under Starting and Adjusting the Pump on page 11.