Graco Series A User manual

308190M
EN
Instructions
Displacement
Pump
Models:
236787, Series A
235699, Series B
241320, Series A
Models 236787 and 235699 Shown
Important Safety Instructions
Read all warnings and instructions in this manual.
Be familiar with the controls and the proper usage
of the equipment. Save these instructions.
Use only genuine Graco Replacement Parts. Use of non-Graco replacement parts may void
warranty.

Warnings
2308190M
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 or on warning labels, 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
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent
fire and explosion:
•Use equipment only in well ventilated area.
•Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop
cloths (potential static arc).
•Ground all equipment in the work area. See Grounding instructions.
•Never spray or flush solvent at high pressure.
•Keep work area free of debris, including solvent, rags and gasoline.
•Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes
are present.
•Use only grounded hoses.
•Hold gun firmly to side of grounded pail when triggering into pail. Do not use pail liners unless they
are anti-static or conductive.
• Stop operation immediately if static sparking occurs or you feel a shock.Do not use equipment
until you identify and correct the problem.
•Keep a working fire extinguisher in the work area.
SKIN INJECTION HAZARD
High-pressure spray is able to inject toxins into the body and cause serious bodily injury. In the event
that injection occurs, get immediate surgical treatment.
•Do not aim the gun at, or spray any person or animal.
•Keep hands and other body parts away from the discharge. For example, do not try to stop leaks
with any part of the body.
•Always use the nozzle tip guard. Do not spray without nozzle tip guard in place.
•Use Graco nozzle tips.
•Use caution when cleaning and changing nozzle tips. In the case where the nozzle tip clogs while
spraying, follow the Pressure Relief Procedure for turning off the unit and relieving the pressure
before removing the nozzle tip to clean.
•Equipment maintains pressure after power is shut off. Do not leave the equipment energized or
under pressure while unattended. Follow the Pressure Relief Procedure when the equipment is
unattended or not in use, and before servicing, cleaning, or removing parts.
•Check hoses and parts for signs of damage. Replace any damaged hoses or parts.
•This system is capable of producing 3000 psi (210 bar/21 MPa). Use Graco replacement parts or
accessories that are rated a minimum of 3000 psi (210 bar/21 MPa).
•Always engage the trigger lock when not spraying. Verify the trigger lock is functioning properly.
•Verify that all connections are secure before operating the unit.
•Know how to stop the unit and bleed pressure quickly. Be thoroughly familiar with the controls.

Warnings
308190M 3
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 manu-
facturer’s replacement parts only.
•Do not alter or modify equipment. Alterations or modifications may void agency approvals and create
safety hazards.
•Make sure all equipment is rated and approved for the environment in which you are using it.
•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.
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or
swallowed.
•Read Safety Data Sheet (SDS) to know the specific hazards of the fluids you are using.
•Route exhaust away from work area. If diaphragm ruptures, fluid may be exhausted into the air.
•Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
PERSONAL PROTECTIVE EQUIPMENT
Wear appropriate protective equipment when in the work area to help prevent serious injury, including
eye injury, hearing loss, inhalation of toxic fumes, and burns. This protective equipment includes but is
not limited to:
•Protective eyewear, and hearing protection.
•Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer
WARNING

Displacement Pump
4308190M
Displacement Pump
Pressure Relief Procedure
Follow the Pressure Relief Procedure whenever
you see this symbol.
1. Engage the gun safety latch.
2. Turn ON/OFF switch to OFF.
3. Unplug power supply cord.
4. Disengage the gun safety latch. Hold a metal part of
the gun firmly to a grounded metal pail. Trigger the
gun to relieve pressure.
5. Engage the gun safety latch.
6. Open the pressure drain valve. Leave the pressure
drain valve open until you are ready to spray again.
7. If you suspect the spray tip or hose is clogged or
that pressure has not been fully relieved after follow-
ing 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.
NOTE 1: Packing Repair Kit 235703 is available. Parts
included in the kit are marked with a *. Use all the new
parts in the kit; use items 125 and 126 only in Displace-
ment Pumps 235699 and 241320.
NOTE 2: Check the motor brushes and clean the trans-
ducer whenever you repack the pump. Replace these
parts as needed. See the sprayer manual for instruc-
tions.
Intake Valve Repair
1. Unscrew the intake valve (118). Remove the o-ring
(119*), ball guide (120), stop pin (122*) and ball
(121*) from the valve.
2. Clean and inspect the parts for wear or damage.
Replace parts as needed. Use a new o-ring (119*).
If no further service is needed, reassemble the
pump.
Removing the Pump (FIG. 1)
1. Flush the pump, if possible. Relieve pressure. Stop
the pump with the piston rod (107) in its lowest posi-
tion, if possible. To lower the piston rod manually,
rotate the motor fan blades.
2. Remove the filter (B), if your sprayer has one.
3. While pulling upward on the suction hose (C),
unscrew the hose from the inlet tube (D). Unscrew
the drain hose (E) from the displacement.
This equipment stays pressurized until pressure is
manually relieved.
To help prevent serious injury from pressurized fluid,
such as skin injection, splashing fluid and moving
parts, follow the Pressure Relief Procedure when you
stop spraying and before cleaning, checking, or
servicing the equipment.
FIG. 1
02832A
118
*119
*121
*122
120
107
F
G
H
E
C
D
A
TORQUE TO
50 ft-lb
(68 N.m)
Apply sealant (42d)
B
J

Displacement Pump
308190M 5
4. Use a screwdriver to push the retaining spring (F)
up and push out the pin (G).
5. Loosen the screws (H) and remove the pump.
Installing Pump
(FIG. 1 and FIG. 2)
1. Mount the pump on the drive housing. Tap it into the
alignment pins with a soft hammer. Tighten the
screws (H) to 50 ft-lb (68 N.m).
2. Align the hole in the rod (107) with the connecting
rod assembly (J). Use a screwdriver to push the
retaining spring (F) up, and push in the pin (G).
Push the retaining spring into place around the con-
necting rod.
3. Replace the o-ring (J) if worn or damaged. Recon-
nect the suction and drain hoses.
4. Tighten the packing nut (102) just enough to stop
leakage, but no tighter. Fill the packing nut/wet-cup
1/3 full with Graco TSL. Push the plug (123) into the
wet-cup.
Disassembling the Pump (FIG. 3)
1. Remove the intake valve (118). See page 4.
2. Unscrew the packing nut (102) and plug (123).
3. Use a plastic mallet to tap the piston rod (107)
down, and then pull the rod out through the bottom
of the cylinder.
4. Remove the throat packings.
5. Loosen the jam nut (117). Remove the cylinder
(115) and the o-ring (116*).
6. Clamp the flats of the piston rod in a vise. Use an
open-end wrench to loosen the nut (110) and then
unscrew the piston valve (108).
7. Remove all parts from the piston valve (108).
FIG. 2
Be sure the retaining spring (F) is firmly in the groove
all the way around, to prevent the pin (G) from working
loose due to vibration. See Fig 2.
If the pin works loose, it or other parts could break off
due to the force of the pump action. These parts could
be projected into the air and result in serious injury or
property damage, including the pump connecting rod
or bearing housing.
TORQUE TO
50 ft-lb (68 N.m)
05897
G
F
123
J
H
102
FIG. 3
114*
125*
126*
lips
down
101
03148A
THROAT
INTAKE VALVE
PISTON
107
109*
110
111
112*
108
123
102
*103
*104 105*
*106
117
*116
115
*113
118
For
Models
235699
and
241320
only
lips
down
lips up

Displacement Pump
6308190M
Reassembling the Pump
NOTE 1: Alternate plastic and leather packings. See Fig
3. The lips of the throat V-packings face down. The lips
of the piston V-packings face up. Incorrect installation
damages the packings and causes pump leaking.
NOTE 2:Soak the leather packings in oil before reas-
sembling the pump.
1. Check the outside of the piston rod (107) and the
inside of the cylinder (115) for wear. Replace worn
parts to ensure a good seal with the new packings.
2. Stack these parts onto the piston valve (108) one at
a time: Models 235699 and 241320 only: the
backup washer (126*) and u-cup (125*), then
All Models:the female gland (114*), alternately
three plastic (112*) with two leather packings (113*),
and the male gland (111*). See Fig 4.
3. Tighten the nut (110) onto the piston valve (108) to
2 in-lb (0.23 N.m). See Fig 4.
NOTE 3:Note the alignment of the piston (108) to the
nut (110). Maintain this alignment through Step 8.
4. Clean all residue from the piston valve threads.
Apply a strip of adhesive, supplied, to the threads.
5. Place the ball (109*) on piston valve (108) (Fig 4).
6. Hand tighten the valve into the piston rod just until
the nut (110) contacts the rod. See Fig 5.
7. Place the flats of the rod (107) in a vise.
8. CAREFULLY tighten the nut (110) against the pis-
ton rod to 30 ft-lb (40 N.m). See Fig 5. Use two
wrenches to maintain the alignment mentioned in
NOTE 3, to the left.
9. Stack parts one at a time into the top of the manifold
(101): the male gland (106*), alternately three plas-
tic packings (104*) with two leather packings (105*),
and then the female gland (103*). See Fig 6.
NOTICE
Tightening the piston valve into the rod, is critical. Fol-
low the procedure carefully to avoid damaging the
packings by over-tightening.
FIG. 4
APPLY A
STRIP OF
SEALANT TO
THESE
THREADS
109*
*111
*113 112*
TORQUE TO
2 in-lb (0.23 N.m)
107
108
114*
110
1720
*125
*126
For Models
235699 and
241320 only
FIG. 5
FIG. 6
107
110
TORQUE NUT
AGAINST ROD
TO 30 ft-lb (40 N.m)
DO NOT ALLOW NUT
(110) TO MOVE RELATIVE
TO PISTON (108) WHEN
TIGHTENING PISTON
AGAINST ROD
108
1
03147
Lips of
v-packings
face down
*105 104*
Leather
*113 Lips of
v-packing
face up
Polyethylene
Lips of
v-packings
face down
112* Polyethylene
114*
122*
121*
101
117
106*
*116
*103
110
*111
115
120
*119
118
107
102
108
123
125*
126*
Torque to
73 ft-lb (98
For
Models
235699
and
241320
only
Leather
Lips of
v-packings
face up
Torque to
53 ft-lb (71 N.m)

Displacement Pump
308190M 7
10. Install the packing nut (102) and plug (124), but
leave loose for now. See Fig 7.
11. Place a new o-ring (116*) firmly in the cylinder (115)
groove. See Fig 7.
12. Coat the piston rod and packings with oil. Carefully
slide the assembly INTO THE TOP OF THE CYLIN-
DER (115). See Fig 7.
13. Place the intake valve (118) in a vise and assemble
its parts. See page 4. Screw the cylinder (115) onto
the valve (118). Turn the jam nut (117) all the way
down. See Fig 7.
14. . Put the manifold in a vise. Guide the rod/cylin-
der assembly up through the manifold (101). Screw
the cylinder (115) into the manifold and tighten to 53
ft-lb (71 N.m). See Fig 7.
15. Tighten intake valve (118) to 53 ft-lb (71 N.m). See
Fig 7.
16. Tighten the cylinder jam nut (117) to 73 ft-lb (98
N.m). See Fig 7.
17. Install the pump. See page 4.
FIG. 7
05118
102 101
116*
117
115
PISTON
ASSEMBLY
107
118
TORQUE CYLINDER (115)
INTO MANIFOLD (101) TO
53 ft-lb (71 N.m).

Parts
8308190M
Parts
Model 236787, Series A: Includes 101 to 124
Model 235699, Series B: Includes 101 to 126
Model 241320, Series A: Includes 101 to 126
* Supplied in Repair Kit 235703. Keep a repair kit on hand to
reduce down time.
† Used in Displacement Pumps 235699 and 241320 ONLY.
REF Part No. Description Qty
101 PUMP MANIFOLD 1
187611 Models 236787 and 235699
193724 Model 241320
102 193047 PACKING NUT 1
103* 176757 GLAND, female, throat 1
104* 176997 V-PACKING,UHMW polyeth-
ylene, throat
3
105* 176755 V-PACKING, leather, throat 2
106* 176754 GLAND, male, throat 1
107 DISPLACEMENT ROD 1
187613 Model 236787
235709 Models 235699 and 241320
108 PISTON VALVE 1
224808 Model 236787
218197 Models 235699 and 241320
109* 105444 BALL, 5/16 in., piston 1
110 176751 NUT, hex, 1/2-20 unf-2b 1
111* 176750 GLAND, male, piston 1
112* 176882 V-PACKING 3
113* 176749 V-PACKING, leather, piston 2
114* 180073 GLAND, female, piston 1
115 CYLINDER, pump 1
236786 Model 236787
235708 Models 235699 and 241320
116* 108526 PACKING, o-ring, PTFE 1
117 187614 JAM NUT, 1-3/8-18 unef-2b 1
118 224966 INLET VALVE 1
119* 111603 PACKING, o-ring, PTFE 1
120 176760 BALL GUIDE 1
121* 105445 INLET BALL, 1/2 in. 1
122* 176759 BALL STOP PIN 1
123 180656 PLUG 1
124* 102969 SEALANT (not shown) 1
125*† 105522 PACKING, u-cup, polyurethane 1
126*† 186652 WASHER, backup, steel 1
225 157350 ADAPTER, 3/8 npt x 1/4 npt 1
REF Part No. Description Qty

Parts
308190M 9
03148b
Models
235699
and
241320
only
123
102
101
107
109*
110
108
*122
121*
115
*116
117
118
119*
120
106*
104*
*105
103*
112*
114*
111*
*113
*125
*126
225

All written and visual data contained in this document reflects the latest product information available at the time of publication.
Graco reserves the right to make changes at any time without notice.
For patent information, see www.graco.com/patents.
Original instructions. This manual contains English. MM 308190
Graco Headquarters: Minneapolis
International Offices: Belgium, China, Japan, Korea
GRACO INC. AND SUBSIDIARIES • P.O. BOX 1441 • MINNEAPOLIS MN 55440-1441 • USA
Copyright 2014, Graco Inc. All Graco manufacturing locations are registered to ISO 9001.
www.graco.com
Revision M, April 2015
Technical Data
Graco Information
For the latest information about Graco products, visit www.graco.com.
For patent information, see www.graco.com/patents.
TO PLACE AN ORDER, contact your Graco distributor or call 1-800-690-2894 to identify the nearest distributor.
DISPLACEMENT PUMP US Metric
Working pressure range 0-3000 psi 0-210 bar / 0-21 MPa
Cycles per gallon/liter 620 164
Pump inlet size 1/2 npt (f)
Pump outlet size 1/4 npt
Wetted Parts
Models 236787 and 235699 Stainless steel, carbon steel, aluminum, polyethylene,
Delrin, leather
Model 241320 Stainless steel, carbon steel, polyethylene, Delrin,
leather