Graco 218746 Operation manual

Instructions--Parts List
307652S
EN
Displacement Pump
For supply and circulation of finishing materials.
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
360 psi (25 bar) Maximum Wor ing Pressure*
* The maximum safe working pressure is determined by the motor
to whi h this displa ement pump is onne ted.
Part No. 21 746, Series E
Stainless Steel, UHMWPE and Leather Pa ked Pump
Part No. 237199, Series A
Stainless Steel, PTFE Pa ked Pump
Part No. 237140, Series A
Carbon Steel, Leather Pa ked Pump with PTFE Ba kup
Part No. 237141, Series A
Carbon Steel, Leather and PTFE Pa ked Pump
Table of Contents
Warnings 2................................
Servi e 4.................................
Parts 12..................................
Te hni alData 15..........................
Gra oWarranty 16.........................
Gra oInformation 16.......................
06080

2 307652
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instru tions.
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destru tion of equipment if you do not follow the
instru tions.
WARNING
INSTRUCTIONS
EQUIPMENT MISUSE HAZARD
Equipment misuse an ause the equipment to rupture or malfun tion and result in serious injury.
DThis equipment is for professional use only.
DRead all instru tion manuals, tags, and labels before operating the equipment.
DUse the equipment only for its intended purpose. If you are not sure, all your Gra o distributor.
DDo not alter or modify this equipment.
DChe k equipment daily. Repair or repla e worn or damaged parts immediately.
DDo not ex eed the maximum working pressure of the lowest rated system omponent. Refer to the
Technical Data on page 15 for the maximum working pressure of this equipment.
DUse fluids and solvents whi h are ompatible with the equipment wetted parts. Refer to the Tech-
nical Data on page 15, and in all equipment manuals. Read the fluid and solvent manufa turer’s
warnings.
DDo not use hoses to pull equipment.
DRoute hoses away from traffi areas, sharp edges, moving parts, and hot surfa es. Do not expose
Gra o hoses to temperatures above 82_C (180_F) or below --40_C (--40_F).
DWear hearing prote tion when operating this equipment.
DDo not lift pressurized equipment.
DComply with all appli able lo al, state, and national fire, ele tri al, and safety regulations.

307652 3
WARNING
FIRE AND EXPLOSION HAZARD
Improper grounding, poor ventilation, open flames or sparks an ause a hazardous ondition and
result in a fire or explosion and serious injury.
DGround the equipment and the obje t being sprayed. Refer to Grounding in your separate pump
manual.
DIf there is any stati sparking or you feel an ele tri sho k while using this equipment, stop spray-
ing immediately. Do not use the equipment until you identify and orre t the problem.
DProvide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid
being sprayed.
DKeep the spray area free of debris, in luding solvent, rags, and gasoline.
DEle tri ally dis onne t all equipment in the spray area.
DExtinguish all open flames or pilot lights in the spray area.
DDo not smoke in the spray area.
DDo not turn on or off any light swit h in the spray area while operating or if fumes are present.
DDo not operate a gasoline engine in the spray area.
TOXIC FLUID HAZARD
Hazardous fluid or toxi fumes an ause serious injury or death if splashed in the eyes or on the skin,
inhaled, or swallowed.
DKnow the spe ifi hazards of the fluid you are using.
DStore hazardous fluid in an approved ontainer. Dispose of hazardous fluid a ording to all lo al,
state and national guidelines.
DAlways wear prote tive eyewear, gloves, lothing and respirator as re ommended by the fluid and
solvent manufa turer.
MOVING PARTS HAZARD
Moving parts an pin h or amputate your fingers.
DKeep lear of all moving parts when starting or operating the pump.
DBefore servi ing the equipment, follow the Pressure Relief Procedure on page 4 to prevent the
equipment from starting unexpe tedly.

4 307652
Service
Pressure Relief Procedure
WARNING
PRESSURIZED EQUIPMENT HAZARD
The system pressure must be manually relieved to
prevent the system from starting or spraying a i-
dentally. To redu e the risk of an injury from a i-
dental spray from the gun, splashing fluid, or
moving parts, follow the Pressure Relief Proce-
dure whenever you:
Dare instru ted to relieve the pressure,
Dstop spraying,
Dhe k or servi e any of the system equipment,
Dor install or lean the spray nozzle.
1. Shut off the air or hydrauli power supply to the
pump.
2. Close the bleed-type master air valve (required in
air-powered systems).
3. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure.
4. Open the drain valve (required in your system),
having a ontainer ready to at h the drainage.
5. Leave the drain valve open until you are ready to
spray again.
If you suspect that the spray nozzle or hose is com-
pletely clogged, or that pressure has not been fully
relieved after following the steps above, very slowly
loosen the nozzle retaining ring or hose end oupling
and relieve pressure gradually, then loosen ompletely.
Now lear the nozzle or hose.
Piston and Intake Valve Adjustment
See Fig. 1. The fluid piston and intake he k valves
are fa tory-set for pumping medium vis osity fluids.
The ball stop pin (18) in the intake valve is in the
lowest set of holes. The piston ball travel is set at
0.204 in. (5.2 mm), measured from the end of the
adjustable plunger rod (38e) to the top of the ball (12).
This distan e represents four omplete turns of the rod
(38e) from the top of the ball.
1. If you are pumping heavy viscosity fluid and
erratic pump operation develops, disassemble
the pump as explained on page 5. To increase
the ball travel in the inta e valve, move the pin (18)
to the enter or upper set of holes. To increase the
ball travel in the piston valve, pla e the piston in a
vise, loosen the upper ap (38d) to relieve tension
on the plunger rod (38e), and turn the plunger rod
ounter lo kwise two omplete turns beyond its
fa tory-set position, or enough to set the total ball
travel to 0.306 in. (7.8 mm).
2. If you are pumping lighter viscosity fluid and
surging develops, disassemble the pump as
explained on page 5. To decrease the ball travel
in the inta e valve, pla e the pin (18) in the lowest
set of holes. To decrease the ball travel in the
piston valve, pla e the piston in a vise, loosen the
upper ap (38d) to relieve tension on the plunger
rod (38e), and turn the plunger rod lo kwise two
omplete turns beyond its fa tory-set position, or
enough to set the total ball travel to 0.102 in. (2.6
mm).
Piston Valve
Ball Travel
Intake Valve
Ball Travel
Fig. 1
06081
38d
38e
18
21
22
12

307652 5
Service
Before you start:
1. Have all ne essary repair parts on hand. Re om-
mended spare parts are marked in the parts list
with a he k mark, for example (12n).
2. Pa king Repair Kits are available for some pumps.
See the parts list for your pump to order the or-
re t kit. Use all the new parts in the kit for the best
results. Kit parts are indi ated in the parts list with
an asterisk, for example (7*).
3. Always repla e the glands when repla ing the
pa kings, whether or not you use a repair kit.
4. Use a ompatible solvent to lean parts. Inspe t
for wear or damage and repla e parts as needed.
5. Use light, waterproof grease wherever lubri ation
is re ommended.
6. An adjustable pin spanner wren h with a 3.25 in h
apa ity and 1/4 in h pin will be ne essary for
performing step 9 under Disassembly and step 11
under Reassembly.
Disassembly (See Fig. 2)
WARNING
To redu e the risk of serious injury whenever you
are instru ted to relieve pressure, always follow the
Pressure Relief Procedure on page 4.
1. Flush the pump, if possible. Relieve the pressure.
2. Dis onne t the air and fluid lines. Remove the
pump from its mounting and lamp it in a vise.
Dis onne t the displa ement pump from the motor
as explained in your separate pump manual.
3. Loosen the pa king nut/wet- up (2). Uns rew and
remove the four tie bolts (31) and lo kwashers
(32). Pull the intake valve housing (19 and/or 20)
off the pump.
4. Remove and inspe t the intake valve gasket (7).
Uns rew the retainer and seat assembly (22) from
the intake valve housing (20). Remove the ball
stop pin (18), noting whi h holes it is in. Remove
the intake valve ball (21). Handle the ball carefully
as it can be easily damaged.
5. Clean all parts of the intake valve and inspe t
arefully for wear or damage. Inspe t the seat (C)
of the retainer and seat assembly (22), but do not
attempt to remove it. If the seat is worn or dam-
aged, repla e the entire retainer and seat assem-
bly.
6. Pull the pump ylinder (9) straight off the outlet
housing (6), being areful not to tilt it until it is lear
of the displa ement rod (38 ) and piston assembly
(B).
7. Inspe t the polished inner surfa e of the ylinder
(9) for s oring, wear or damage by running a finger
over the surfa e or holding the part up to a light at
an angle. Repla e if ne essary.
8. Remove the three s rews (17) and washers (16),
and disassemble the piston. Be very careful when
handling the ball (12) and seat (23) as they can be
very easily damaged. Clean all parts and inspe t
arefully for wear or damage.
9. Uns rew the pa king nut/wet- up (2) from the
outlet housing (6). Pull the displa ement rod (38 )
down out of the outlet housing. Remove and
inspe t the outlet housing gasket (7).
10. Push the throat pa kings and glands (A) out of the
outlet housing (6). Clean the outlet housing and
throat pa kings, and inspe t for wear or damage.
11. Inspe t the polished outer surfa e of the displa e-
ment rod (38 ) for s oring, wear or damage by
running a finger over the surfa e or holding the
part up to a light at an angle. Repla e if ne essary.
12. Do not disassemble the displacement rod
assembly unless necessary. Before disassem-
bling, arefully measure how far the adjustable
plunger rod (38e) protrudes from the lower ap
(38f). This determines the amount of piston ball
(12) travel. S rew the plunger rod (38e) out of the
displa ement rod assembly, and inspe t the o-
rings (38a) in pla e. Disassemble the upper and
lower aps (38d, 38f) from the displa ement rod
(38 ). Inspe t the o-rings (38b) in pla e.

6 307652
Service
Fig. 2
06082
Models 21 746 and 237199:
Apply thread lubri ant and torque to
20--24 ft--lb (27--33 N.m).
Models 237140 and 237141:
Apply thread lubri ant and torque to
200--225 in--lb (22--25 N.m).
1
3
4
2
Apply thread sealant.
2
6
7*
9
7*
38d
38b
38
38a
38a
38b
38f
38e
12
22
18
19 or 20
21
31
5
See Fig. 3.
See Fig. 4. 5
4
3
1
2
A
B
C
Apply thread lubri ant and torque to
20--24 ft--lb (27--33 N.m).

307652 7
Service
Reassembly (See Fig. 2)
1. Lubri ate the pa king nut and all pa kings and
seals with sili one-free lubri ant, su h as no. 2
lithium-base grease, before reassembling.
2. If it was ne essary to disassemble the displa e-
ment rod assembly, reassemble the upper and
lower aps (38d, 38f) and the plunger rod (38e) to
the displa ement rod (38 ). S rew the plunger rod
through the lower ap until it protrudes the re-
quired distan e as was re orded in step 12 of
Disassembly.
3. Install the male gland, v-pa kings, and female
gland in the outlet housing (6), as shown for your
pump model (see Fig. 3). Install the v-pa kings
one at a time, with the lips fa ing down.
4. Install the gasket (7*) in the outlet housing (6).
Loosely install the pa king nut/wet- up (2). Insert
the displa ement rod assembly in the bottom of
the outlet housing and push it up until the threads
of the upper ap (38d) are roughly level with the
top of the pa king nut/wet- up. (This makes it
easier to onne t the oupling nut when the dis-
pla ement pump is reinstalled on the motor.)
Fig. 3
06083
1
2Lips of v-pa kings must fa e down.
Apply sealant to male threads and torque to 80--90 ft--lb (108--122 N.m).
Model 237140Model 237141Model 21 746
0608306083
2
42*
43*
6
*41
*40
28
3Lubri ate threads and torque to 20--24 ft--lb (27--33 N.m).
1
2
2
3
2
41*
43*
6
*42
*40
28
1
22
3
2
43*
6
*41
*40
28
1
2
3
*42
2
Model 237199
06083
2
43*
6
*41
*40
28
1
2
3

307652
Service
5. Pla e a washer (16) on ea h of the three s rews
(17). Assemble the piston as shown for your pump
model (see Fig. 4). Pla e the piston valve seat
(23) in the enter of the piston assembly so its lip
bottoms out. Continue sta king the parts on the
s rews (17) as shown. Pla e the piston ball (12)
on the seat (23).
6. Pla e a piston spa er (37) on ea h of the s rews
(17). Apply thread sealant to the s rews and s rew
the piston assembly into the lower ap (38f).
Torque the s rews (17) to 350--370 in-lb (40--42
N.m). See Fig. 4.
7. Carefully guide the ylinder (9) over the piston
assembly and displa ement rod until it seats in the
outlet housing (6). See Fig. 2.
NOTE: A essory Pa king Tool 194248 is re om-
mended to ease insertion of the piston assembly into
the ylinder.
8. Apply thread sealant and s rew the retainer and
seat assembly (22) into the intake valve housing
(20). Install the gasket (7*) on the intake valve
housing.
9. Pla e the intake valve ball (21) on the seat of the
retainer and seat assembly (22). Install the ball
stop pin (18) in the same set of holes from whi h it
was removed. (To readjust ball travel, see Piston
and Intake Valve Adjustment on page 4.)
10. Lubri ate the tie bolts (31) and install a lo kwasher
(32) on ea h. Install the tie bolts through the intake
valve housing (19 or 20) and up into the outlet
housing (6). Torque oppositely and evenly, as
spe ified in Fig. 2.
11. Torque the pa king nut/wet- up (2) 20--24 ft-lb
(27--33 N.m); do not overtighten or you may dam-
age the pa kings. Re onne t the displa ement
pump to the motor as explained in your separate
pump manual. Re onne t the ground wire if it was
dis onne ted during servi e.
12. Fill the pa king nut/wet- up (2) 1/3 full of Gra o
Throat Seal Liquid or a ompatible solvent. Re on-
ne t all hoses and return the pump to operation.
Fig. 4
1Apply thread sealant and torque to 350--370 in--lb (40--42 N.m).
06075
Model 237140Models 21 746, 237141, and 237199
06077
13*
12n
14n
15n
16
17
23
24*
37
13*
15n
24*
1
13*
12n
14n
15n
16
17
23
24*
37
13*
15n
24*
1

06077
42*
43*
*7
9
13*.
18
*41
*40
31
n38a
12n
2
6
14n
15n
16
17
19
20
21n
22
23
24*
28
32
37
38an
38bn
38
38d
38e
38f
*7
13*.
15n
24*
n38b
307652 9
Parts
Model 21 746, Series E, Stainless Steel, UHMWPE and Leather Packed
Ref Part
No. No. Description Qty
Ref Part
No. No. Description Qty
2 181871 PACKING NUT/WET-CUP 1
6 180933 HOUSING, outlet, pump 1
7* 180963 GASKET; nylon 2
9 24C498 CYLINDER, pump 1
12n101917 BALL, piston; steel;
7/8” (22 mm) diameter 1
13*.180792 PACKING, up; UHMWPE 2
14n180958 WASHER, ba k-up 1
15n180956 WASHER, piston 2
16 171163 WASHER, flat 3
17 108139 CAPSCREW, hex hd;
3/8--16 x 2--1/2” (63 mm) long 3
18 171176 PIN, straight 1
19 171250 PLATE, tie 1
20 180959 HOUSING, intake valve 1
21n101968 BALL, intake; steel;
1--1/4” (31.8 mm) diameter 1
22 214618 RETAINER AND SEAT, intake valve 1
23 180944 SEAT, piston valve 1
24* 180791 GASKET, piston; ellulose fiber 2
28 236433 UNION, adapter, straight;
1” npt(m) x 1” npsm(f) swivel 1
31 103961 BOLT, hex hd; 3/8--16 un --2a x
9” (229 mm) long 4
32 103975 LOCKWASHER; 3/8” (10 mm) size 4
37 171167 SPACER, piston 3
38 DISPLACEMENT ROD ASSY
In ludes items 38a--38f 1
38an107305 . O-RING; fluoroelastomer 2
38bn107306 . O-RING; fluoroelastomer 2
38 24C502 . ROD, displa ement 1
38d 190118 . CAP, rod, upper 1
38e 171214 . SCREW, adjusting 1
38f 171212 . CAP, rod, lower 1
39Y172479 TAG, warning (not shown) 1
40* 181396 GLAND, female 1
41* 181870 V-PACKING; UHMWPE 3
42* 166490 V-PACKING; leather 2
43* 171209 GLAND, male 1
44Y179761 TAG, warning (not shown) 1
* These parts are included in Repair Kit 220927, which may
be purchased separately.
.Accessory Pac ing Tool 194248 is recommended to ease
piston insertion into the cylinder.
nKeep these spare parts on hand to reduce down time.
YReplacement Danger and Warning labels, tags and cards
are available at no cost.

06077
43*
*7
9
13*.
18
*41
*40
31
n38a
12n
2
6
14n
15n
16
17
19
20
21n
22
23
24*
28
32
37
38an
38bn
38
38d
38e
38f
*7
13*.
15n
24*
n38b
10 307652
Parts
Model 237199, Series A, Stainless Steel, PTFE Packed
Ref Part
No. No. Description Qty
Ref Part
No. No. Description Qty
2 181871 PACKING NUT/WET-CUP 1
6 180933 HOUSING, outlet, pump 1
7* 180963 GASKET; nylon 2
9 24C498 CYLINDER, pump 1
12n101917 BALL, piston; steel;
7/8” (22 mm) diameter 1
13*.164920 PACKING, up; PTFE 2
14n180958 WASHER, ba k-up 1
15n180956 WASHER, piston 2
16 171163 WASHER, flat 3
17 108139 CAPSCREW, hex hd;
3/8--16 x 2.5” (76 mm) long 3
18 171176 PIN, straight 1
19 171250 PLATE, tie 1
20 180959 HOUSING, intake valve 1
21n101968 BALL, intake; steel;
1--1/4” (31.8 mm) diameter 1
22 214618 RETAINER AND SEAT, intake valve 1
23 180944 SEAT, piston valve 1
24* 180791 GASKET, piston; ellulose fiber 2
28 236433 UNION, adapter, straight;
1” npt(m) x 1” npsm(f) swivel 1
31 103961 BOLT, hex hd; 3/8--16 un --2a x
9” (229 mm) long 4
32 103975 LOCKWASHER; 3/8” (10 mm) size 4
37 171167 SPACER, piston 3
38 DISPLACEMENT ROD ASSY
In ludes items 38a--38f 1
38an107305 O-RING; fluoroelastomer 2
38bn107306 O-RING; fluoroelastomer 2
38 24C502 ROD, displa ement 1
38d 190118 CAP, rod, upper 1
38e 171214 SCREW, adjusting 1
38f 171212 CAP, rod, lower 1
39Y172479 TAG, warning (not shown) 1
40* 181396 GLAND, female 1
41* 166769 V-PACKING; PTFE 5
43* 171209 GLAND, male 1
44Y179761 TAG, warning (not shown) 1
* These parts are included in Repair Kit 237200, which may.
be purchased separately.
.Accessory Pac ing Tool 194248 is recommended to ease
piston insertion into the cylinder.
nKeep these spare parts on hand to reduce down time.
YReplacement Danger and Warning labels, tags and cards
are available at no cost.