Graco 24B748 User manual

311845H
EN
Instructions
Displacement Pump
For portable spray application of architectural paints and coatings.
For professional use only.
Not approved for use in European explosive atmosphere locations.
Model 24B748, 288467, 288468, 288819, 24M629
3300 psi (22.8 MPa, 25 bar) Maximum Working Pressure
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
ti8844a
Model 288467/288468
Model 24B748
Model 288819
ti13921a
ti9568a
Model 24M629
ti18706a

Warnings
2311845H
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 symbol refers to procedure-specific risk. Refer back
to these warnings. Additional, product-specific warnings may be found 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 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.

Service
311845H 3
Service
Pressure Relief Procedure
1. Engage trigger lock.
2. Turn engine ON/OFF switch to OFF.
3. Move pump switch to OFF and turn pressure control
knob fully clockwise.
4. Unlock trigger lock. Hold metal part of gun firmly to
side of grounded metal pail and trigger gun to
relieve pressure.
5. Engage the trigger lock.
6. Open all fluid drain valves in the system, having a
waste container ready to catch drainage. Leave
drain valve(s) open until you are ready to spray
again.
If you suspect the spray tip or hose is 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. Clear hose or tip obstruction.
Tools Needed
•Vise
• 12-inch adjustable, open-end wrench (2)
• Hammer, 20 oz. maximum
• Small screwdriver
• Throat Seal Liquid
• Pick or long small screwdriver
Cleaning and Inspecting Parts
• Clean and inspect all parts. Replace worn or dam-
aged parts.
• Remove and clean the sleeve when you are repack-
ing the pump.
The system pressure must be manually relieved to pre-
vent the system from starting or spraying accidentally.
To reduce the risk of an injury from accidental spray
from the gun, splashing fluid, or moving parts, follow
the Pressure Relief Procedure whenever you,
• are instructed to relieve the pressure
• stop spraying
• check or service any of the system equipment
• install or clean the spray nozzle.
Never use a sharp or pointed tool to remove sleeve
or other components which could result in pump rup-
ture and cause serious bodily injury. If the sleeve
cannot be removed easily, return the sleeve and cyl-
inder to an authorized Graco distributor for removal.
Component What to look for
Ball seats in intake valve
and piston
Nicks or wear
Inside sleeve Worn or scratched
Piston rod Worn or scratched

Repair
4311845H
Repair
See your sprayer instruction manual for complete
instructions for removing and installing the pump in your
sprayer.
Disassembly
1. Remove packing nut (3).
2. Unscrew intake valve from cylinder.
3. Disassemble intake valve. Clean and inspect o-ring
(17). You may need to use a pick to remove o-ring.
NOTE: Spring (26) for model 288819 is optional and
is not included with the pump.
4. Use a hammer to tap piston rod (5) out of cylinder
(2), or flip pump over and tap piston rod out against
work bench.
5. Remove piston rod (5) from sleeve (4).
3
ti8845a
ti8846a
ti8847b
26
(288467, 288468, 24M629)
17
18
19
16
1
(288819)
26
ti8848a
5
2
ti8849a
4
5

Repair
311845H 5
6. Unscrew piston valve (6) from piston rod (5). Clean
and inspect parts. The piston has a special thread
locking/sealing patch. Do not remove the patch. The
patch allows for disassembly/assembly procedures
before it is necessary to apply thread sealant to the
threads.
7. Remove packing and glands from piston rod. Note
orientation for installation.
8. Remove throat packings and glands from cylinder.
Discard throat packings and glands.
Do not clean or wipe piston valve (6) threads. Clean-
ing the piston valve threads could destroy the special
sealing patch and cause the piston valve to come
loose during operation.
ti8850a
6
5
ti8851a
8
9
6
13
12
10
11
5
ti8853a
21
22
23

Repair
6311845H
Reassembly
1. Stack male gland (7) on piston rod (5).
2. Alternately stack blue UHMWPE (8) and brown
UHMWPH (9) (24B748, 288467, 2884680, 24M629)
or leather (288819) packings on piston rod.
Note orientation.
3. Install female gland (10).
4. Install backup washer (13) and piston wiper (12) on
piston valve (6). Note orientation.
The special sealing patch on piston valve threads is
good for 4 repackings. Use thread sealant on piston
valve threads after 4 repackings.
5. Install ball (11) in piston rod (5). If thread sealant is
applied to piston valve threads, ensure that none
gets on ball.
6. Install piston valve (6) to piston rod (5). Torque to 55
+/- 3 ft-lb (74.57 +/- 4 N• m).
ti8854a
13
12
10
7
8
9
5
6
ti8855a
11
5
ti8856a
6
5

Repair
311845H 7
7. Soak all leather packings in SAE 30W oil for 1 hour
minimum prior to assembly.
8. Place male gland (20) in cylinder.
9. Alternately stack UHMWPE (21) and leather pack-
ings (22). Note orientation.
10. Place female gland (23) in top of cylinder. Seat
packings.
11. Install packing nut (3) into cylinder and hand tighten.
12. Install o-rings (14) inside cylinder (2) and on sleeve
(4). Slide sleeve (4) into bottom of cylinder (2).
Replace o-ring (15) if desired.
NOTE: O-ring (15) is not required for safe pump opera-
tion.
13. Grease top inch or two of piston rod (5) that goes
through the sleeve/cylinder assembly throat pack-
ings. Grease piston packings at bottom of piston
pump.
Carefully slide piston assembly (5) into bottom of
sleeve/cylinder assembly (2) until pump rod pro-
trudes out the top and piston packings are totally
inside the sleeve (4).
NOTICE
Never slide piston assembly (5) into top of sleeve (4)
as this may damage piston packings.
20
23
21 22
ti8857a
288467
OR
288468
24B748
288819
24M629
ti8858a
3
2
4
15
14
Place inside cylinder (2)
and push to shoulder
with sleeve (4).
ti8859a
ti8860a
5
15
2
4
ti8860a

Repair
8311845H
14. Reassembly intake valve with new o-ring (17), seat
(16) and ball (19). Seat may be flipped over and
used on the other side. Clean seat thoroughly.
NOTE: Spring (26) for model 288819 is optional and
is not included with the pump.
15. Install intake valve on cylinder. Torque to: 200 +/- 15
ft-lb (271 +/- 20 N•m) for 288467, 288468, 288819,
24M629; 110+/- 5 ft-lb (149 +/- 7 N•m) for 24B748.
16. Torque packing nut to:
140 +/- 10 in-lb (15 +/- 1 N•m) 288467, 288468,
288819, 24M629.
125 +/- 10 in-lb (14 +/- 1 N•m) 24B748
When pump packings begin to leak, tighten packing
nut down until leakage stops or lessens. This allows
approximately 100 gallons of additional operation
before repacking is required.
ti8847b
19
16
17
26
(288467, 288468, 24M629)
18
(288819)
26
ti8861a

Parts
311845H 9
Parts
Model 288467/288468
*Included in Repair Kit 287813
† Included in Repair Kit 240918
ti8826a
24
3
25
23
8
21
20
5
11
12
13
6
2
15
14
4
14
18
19
16
17
1
26
7
8
9
10
Ref Part Description Qty
1 15E655 HOUSING 1
2 288482 CYLINDER (model 288467) 1
288483 CYLINDER (model 288468)
3 15J792 NUT, packing 1
4 249121 SLEEVE, cylinder (model 288467) 1
287817 SLEEVE, cylinder (model 288468)
5 288469 ROD, piston (model 288467) 1
288470 ROD, piston (model 288468)
6 249177 VALVE, piston 1
7* 189585 GLAND, packing, male 1
8* PACKING,VEE (blue) 8
9* PACKING,VEE (brown) 3
10* 189588 GLAND, packing, female 1
11* 107203 BALL, valve, check 1
12* 119636 WIPER, piston 1
13* 15J800 WASHER, back up 1
14* 108822 PACKING, o-ring 2
15* 160325 PACKING, o-ring 1
16† 240918 SEAT, carbide 1
17†* 107098 PACKING, o-ring 1
18 198505 GUIDE, ball 1
19†* 107167 BALL,SST 1
20* 15G658 GLAND, male 1
21* PACKING,VEE (leather) 3
23* 15G657 GLAND, female 1
24* 112590 PLUG, throat, seal 1
25* 157195 PACKING, o-ring 1
26 233698 SPRING, intake ball 1

Parts
10 311845H
Model 24B748
*Included in Repair Kit 288471
†Included in Repair Kit 244199
ti13922a
24
3
25
10
7
5
2
27
15
14
4
14 26
1
17
16
19
18
6
11
13
12
10
7
5
8888
99
9
88
88
22
2222
Ref Part Description Qty
1 195894 HOUSING, intake 1
2 288727 CYLINDER 1
3 193032 NUT, packing 1
4 248210 SLEEVE, cylinder 1
5 288479 ROD, piston 1
6 240150 VALVE, piston 1
7* 183178 GLAND, packing, male 2
8* PACKING (blue) 8
9* PACKING,VEE (brown) 3
10* 183185 GLAND, packing, female 2
11* 101947 BALL, bearing 1
12* 118504 WIPER, piston 1
13* 15C998 WASHER, backup 1
14* 107098 PACKING, o-ring 2
15* 106556 PACKING, o-ring 1
16† 244199 SEAT, carbide 1
17† 108526 PACKING, o-ring 1
18 193027 GUIDE, ball 1
19†* 102972 BALL 1
22* PACKING,VEE (leather) 3
24* 183171 PLUG 1
25* 120818 PACKING, o-ring 1
26 15Y463 BUSHING 1
27 196178 FITTING, nipple, 3/8 npt x 3/8 npsm 1