Graco 287834 Instruction Manual

311485J
EN
Operation
Displacement Pump
- Use with Architectural Coatings, Paints, Roof Coatings
and Below Grade Coatings -
Model 287834
4000 psi (27.6 MPa, 275.8 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
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Warnings
2311485J
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclama-
tion point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When
these symbols appear in the body of this manual, refer back to these Warnings. Product-specific hazard symbols and
warnings not covered in this section may appear throughout the body of this manual where applicable.
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 from distributor or retailer.
• Do not leave the work area while equipment is energized or under pressure. Turn off all equipment and
follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine
manufacturer’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, cut 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 and disconnect all power sources.

Operation
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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 following the steps above, VERY SLOWLY, loosen
tip guard retaining nut or hose end coupling to relieve
pressure gradually, 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).
TIA

Service
4311485J
Service
Removal
1. Flush pump (36). Stop pump on down stroke if pos-
sible.
2. Perform Pressure Relief Procedure, 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).
7. Slide cover (124) up.
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147
36
ti7845b
ti7119b
110
ti7789b
121
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124

Service
311485J 5
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 and clean all parts and o-rings (207).
3. Select proper ball travel for material sprayed. Reas-
semble as shown.
ti7814b
125
ti7782b
122
36
ti7804b
36
ti7875b
213
ti7879b
215
212
207
213
214
209
Shortest Ball Travel Longest Ball Travel
(for light material) (for heavy material)
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Service
6311485J
Piston Rod Assembly
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.
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).
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.
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222
218
203
223
219
206
210
Lips Up
Lips Up
210
206
219
223 203
218
208 222
Lips Up
Lips Up
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Torque to 200
ft.-lb (272 N.m)

Service
311485J 7
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 the cylinder throat packings.
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).
222
220
ti7898a
222
220
ti7896a
222
ti7897a
222
207
205
207
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217
238
204
222
237 Lips Down
Lips Down
205
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202
201

Service
8311485J
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-lb (475 N•m).
12. Torque packing nut (202) down to 50 ft-lb (68 N•m).
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).
213
212
207
214
215
209
ti7873a
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36
122
ti7779a
ti7817a
122
ti7771a
125
ti7815a
125
124

Service
311485J 9
17. Replace clip pin (121) to secure.
18. Reinstall filter housing (110).
19. Connect suction hose (147) to pump outlet (36).
121
125
ti7809a
ti7772a
110
ti7764a
36
147

Parts
10 311485J
Parts
Ref. Part Description Qty.
201* 116385 PLUG 1
202 15G198 NUT, packing 1
203* 15G285 V-PACKING, UHMWPE, blue 3
204* 15H250 GLAND, male, throat 1
205 287836 CYLINDER, pump 1
206* 102972 BALL, sst, 0.875 in. 1
207*† 116377 PACKING, o-ring 3
208 15G196 GUIDE, ball 1
209 197306 SHIM, inlet 3
210 287837 VALVE, piston 1
212† 287838 SEAT, carbide, includes 214 and
207
1
213 15G195 HOUSING, intake (foo) 1
214*† 108001 BALL, sst, 1.5 in. 1
215 15G199 GUIDE, ball 1
216 15H335 FITTING, nipple, 1 inch NPT 1
217* 15H251 GLAND, female, piston steel 1
218* 15G282 GLAND, male 1
219* 15G283 GLAND, female 1
220 287833 SLEEVE, cylinder 1
222 287832 ROD, piston 1
223* 15G284 V-PACKING, brown 2
237* 184307 PACKING, vee, leather 2
238* 108451 PACKING, vee, (UHMWPE) 3
* These parts are included in repair kit 287835, which
may be purchased separately.
† These parts are also included in Carbide Seat Kit
287838, which may be purchased separately.
Ref. Part Description Qty.
213
212
207
214
215
209
207
220
207
205
210
206
223
219
203
218
208
222
204
238
237
217
202
201
216
1
2
2
1
2
Assemble with lips facing up
Assemble with lips facing down
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1