Graco 287834 User manual
Graco Inc. P.O. Box 1441 Minneapolis, MN 55440-1441
Copyright 2006, Graco Inc. is registered to I.S. EN ISO 9001
- Use with Architectural Coatings, Paints, Roof Coatings
and Below Grade Coatings -
4000 psi (27.6 MPa, 275.8 bar) Maximum Working Pressure
Model: 287834
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Important Safety Instructions. Read all
warnings and instructions in this manual. Save
these instructions.
311279
311283
311484
311254
ti7629a
311485D
Instructions
Displacement Pump
Warning
2311485D
Warning
The following are general warning related to the safe setup, use, grounding, maintenance and repair of this equipment.
Additional, more specific warnings may be found throughout the body of this manual where applicable. Symbols ap-
pearing in the body of the manual refer to these general warnings. When these symbols appear throughout the man-
ual, refer back to these pages for a description of the specific hazard.
WARNING
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system
component. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information
about your material, request MSDS forms from distributor or retailer.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine Manu-
facturer’s replacement parts only.
• Do not alter or modify equipment.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
MOVING PARTS HAZARD
Moving parts can pinch or amputate fingers and other body parts.
• Keep clear of moving parts.
• Do not operate equipment with protective guards or covers removed.
• Pressurized equipment can start without warning. Before checking, moving, or servicing equipment,
follow the Pressure Relief Procedure in this manual. Disconnect power or air supply.
Operation
311485D 3
Operation
Pressure Relief Procedure
1 Set pump valve OFF. Turn engine OFF.
2 Turn pressure to lowest setting. Trigger gun into pail to relieve pressure.
3 Open prime valve (vertical).
If you suspect that the spray tip or hose is completely clogged, or that pressure has not been fully relieved after fol-
lowing the steps above, VERY SLOWLY, loosen tip guard retaining nut or hose end coupling to relieve pressure grad-
ually, then loosen completely. Then clean tip and hose.
System pressure must be manually relieved to prevent
it from starting or spraying accidentally. Fluid under
high pressure can be injected into the skin and cause
serious injury. To reduce risk of injury from injection,
follow this procedure whenever you are instructed to
relieve pressure, stop spraying, service equipment or
install or clean spray tip. Read warnings, page 2.
TIA
Service
4311485D
Service
Removal
1. Flush pump (36). Stop pump on down stroke if
possible.
2. Relieve pressure, page 3.
3. Remove suction set (147) from pump (36).
4. Remove paint and drain lines from filter housing.
5. Using a wrench, loosen filter housing fitting (110)
and remove housing from pump.
6. Using a pliers, remove clip (121).
36
147
ti7845a
ti7119
110
ti7789
121
Service
311485D 5
7. Slide cover up (124).
8. Separate coupling (125) and remove.
9. Using a hammer, loosen jam nut (122). Unscrew
pump (36) from power head.
10. Remove pump (36).
Ball Adjustment
1. Using a hammer, loosen and remove intake valve
(213).
2. Disassemble. Clean all parts and inspect o-rings
(207).
ti1816a
124
ti1814a
125
ti7782a
122
36
ti7804a
36
213
ti7875a
213
212
207
214
215
209
ti7879a
Service
6311485D
3. Select proper ball travel for material sprayed. Reas-
semble as shown.
Piston Rod Disassembly
1. Tap piston rod out of cylinder with a hammer or flip
over and tap piston rod out against bench. NOTE:
Sleeve may come out of cylinder with piston rod.
2. If piston rod and sleeve did not separate, invert pis-
ton rod (222) and sleeve (220) and pound on hard
surface until piston rod comes out of sleeve.
3. Hold piston valve (210) securely in vice. Using a
wrench, separate piston valve (210) from rod (222).
4. Remove parts. Note orientation of parts for reas-
sembly.
5. Clean all parts with a compatible solvent and
inspect them for wear or damage. Replace any worn
parts.
Component Rupture Hazard. Do not clean or wipe
piston valve threads. Cleaning the piston valve threads
could destroy the special sealing patch and cause the
piston valve to come loose during operation, causing
pump bursting and possible serious bodily injury.
Shortest Ball Travel Longest Ball Travel
ti7881a ti7874a
(for light material) (for heavy material)
ti7877a
222
210
ti7880a
222
218
203
223
219
206
210
Lips Up
Lips Up
ti7878a
Service
311485D 7
Reassembly
1. Soak all leather packings (237) in SAE 30W oil for at
least 1 hour prior to assembly.
2. Alternately stack V-Packings (203) and V-Packings
(223).
3. Grease piston rod (222) packings and top edge of
sleeve (220).
4. Carefully slide piston rod assembly (222) into top
edge of sleeve (220).
5. Grease top inch or two of piston rod (222) that will
go through he cylinder throat packings.
210
206
219
223 203
218
208 222
Lips Up
Lips Up
ti7878a
Torque to 200
ft.-lbs (272 N.m)
222
220
222
220
222
Service
8311485D
6. Grease o-ring (207) and place on sleeve. Slide one
o-ring (207) inside cylinder (205). Slide sleeve/pis-
ton rod assembly (222) into bottom of cylinder.
7. Install male gland (204) in cylinder (205).
8. Alternately stack UHMWPE packings (238) and
leather packings (237) (note orientation).
9. Place female gland (217) in top of cylinder. Loosely
install packing nut (202) and plug (201).
10. Reassemble intake valve (213) as shown.
11. Place intake valve (213) assembly in vice. Install
cylinder (205) assembly to intake valve. Torque to
350 ft.-lbs (475 N•m).
12. Torque packing nut (202) down to 50 ft.-lbs (68
N•m).
222
207
205
207
217
238
204
222
237 Lips Down
Lips Down
205
ti7884a
202
201
213
212
207
214
215
209
ti7873a
ti7882a
Service
311485D 9
13. Screw jam nut (122) to bottom of pump threads
(36). Screw pump completely up into power head.
14. Hand tighten jam nut (122). Then tighten securely
1/8 to 1/4 turn with hammer or torque to 330 ft-lb
(447.4 N•m).
15. Install coupling (125) around pump rod.
16. Slide cover (124) over coupling (125).
17. Replace clip pin (121) to secure.
36
122
ti7779a
ti7817a
122
ti7771a
125
ti7815a
125
124
121
125
ti7809a
Service
10 311485D
18. Reinstall filter housing (110).
19. Connect suction hose (147) to pump outlet (36).
ti7772a
110
ti7764a
36
147
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