Graco NOVA Operating instructions

824191
Rev. C
REPAIR
INSTRUCTIONS
KEEP FOR REFERENCE.
Read this and all related manuals for
important warnings and instructions.
NOVA/ NOVApro/ SuperNOVApro
Airless Paint Sprayers
3000 psi (210 bar, 21 MPa ) Maximum Working Pressure
120 VAC
Type Series Stand Lo-Boy Hi-Boy
NOVA B 824920
A 824922
NOVApro B 824932
A 824930
SuperNOVApro B 824940 824942
A 824941
Table of Contents
Component Function and Identification 3. . . . . . . . . . . .
Grounding 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Repair Information 4. . . . . . . . . . . . . . . . . . . . . .
Spin Test 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Motor Brush Replacement 10. . . . . . . . . . . . . . . . . . . . .
On/Off Switch Replacement 12. . . . . . . . . . . . . . . . . . . .
Pressure Control Repair 13. . . . . . . . . . . . . . . . . . . . . . .
Drive Housing Replacement 15. . . . . . . . . . . . . . . . . . . .
Motor Replacement 16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement Pump Replacement 17. . . . . . . . . . . . . . .
Technical Data 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sherwin–Williams Standard Warranty 19. . . . . . . . . . . .
Phone Number 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The SHERWIN–WILLIAMS COMPANY, CLEVELAND, OHIO 44115
COPYRIGHT 1999, GRACO INC.
824920
309054. . . . . . . 309053. . . . . . .
309055. . . . . . .
Related Manuals
309070. . . . . . .
824190. . . . . . .
9546A
824192. . . . . . .

2824191
ADVERTENCIA
L’injection de fluide constitue une lésion grave! Si un fluide haute
pression perce la peau, la blessure peut paraître comme une
«simple coupure». Mais il s’agit bien d’une lésion grave! Consulter
immédiatement un médecin.
Pour éviter les risques d’injection, toujours:
Bloquer le loquet de sécuritéde la gâchette àla fin de la pulvérisation.
Pointer le pistolet loin de soi-même et toute autre personne àproximité
Décharger la pression avant de vérifier ou réparer une fuite.
Décharger la pression après la mise hors tension du pulvérisateur ou
àla fin de la pulvérisation.
Ne pas utiliser de composants dont la pression nominale est inférieure
àla pression maximale de service du système.
Ne jamais permettre aux enfants d’utiliser cet appareil. En cas de bles-
sure pour avoir utilisécet appareil, consulter immédiatement un médecin.
Risque d’incendie et d’explosion imminent pendant la pulvérisation
ou le rinçage àpression de fluides inflammables dans une zone àmau-
vaise circulation d’air et en présence de gaz inflammables pouvant
s’allumer par une flamme nue ou des étincelles.
Pour éviter les risques d’incendie et d’explosion:
Manipuler les fluides àl’air libre ou dans une zone extrêmement
bien aérée.
Ne jamais utiliser de trichloroéthane 1,1,1, de chlorure de méthylène,
d’autres solvants àbase d’hydrocarbures halogénés, ni de produits
contenant de tels solvants dans un équipement sous pression en
aluminium. Cela pourrait provoquer une réaction chimique avec risque
d’explosion.
Retirer, éteindre ou déboucher toute source d’inflammation, recouvrir
tout interrupteur mural avec du ruban adhésif. Ne pas fumer dans la
zone de pulvérisation.
Ne jamais remplir le réservoir d’essence lorsque le moteur est chaud
ou en marche.
Mettre àla terre le pulvérisateur, l’objet àpulvériser ainsi que les
seaux de peinture et de solvants.
Tenir le pistolet fermement contre la paroi d’un seau mis àla
terre lorsqu’on pulvérise dans le seau.
N’utiliser qu’un flexible pour peinture pulvérisée sans air.
Ne jamais mettre en marche un moteur dans une zone fermée.
Fluid injection and high pressure hazard: High pressure spray or
leaks can inject fluid into the body.
To help prevent injection, always:
Engage trigger safety latch when not spraying.
Keep clear of nozzle and leaks.
Never spray without a tip guard.
Do PRESSURE RELIEF if you stop spraying or begin servicing
sprayer.
Do not use components rated less than sprayer Maximum
Working Pressure
Never allow children to use this unit.
If high pressure fluid pierces your skin, the injury might look like
“just a cut”. But it is a serious wound! Get immediate medical atten-
tion.
Fire and explosion hazard: Solvent and paint fumes can ignite or
explode.
To help prevent a fire and explosion:
Use only in an extremely well ventilated area.
Eliminate all ignition sources; such as pilot lights, cigarettes and
static arcs from plastic drop cloths. Do not plug or unplug power
cords or turn lights on or off in spray area.
Ground Sprayer, object being sprayed, paint and solvent pails.
Hold gun firmly to side of grounded pail when triggering into pail.
Use only conductive airless paint hose.
Do not use 1,1,1–trichloroethane, methylene chloride, other
halogenated hydrocarbon solvents or fluids containing such
solvents in pressurized aluminum equipment. Such use could
result in a chemical reaction, with the possibility of explosion.
WARNING
MISE EN GARDE
Pueden ocurrir incendios y explosiones cuando se pulveriza fluido in-
flamable o cuando se lava con este tipo de fluido en un área donde la
circulación de aire es deficiente y los vapores inflamables se pueden en-
cender al contacto con el fuego o chispas.
Para prevenir incendios y explosiones:
Use en espacios abiertos o en un área muy bien ventilada.
No utilice nunca tricloretano–1,1,1, cloruro de metileno, u otros di-
solventes a base de hidrocarburos halógenos o fluidos que contengan
tales disolventes en un equipo a presión de aluminio. El uso de estas
sustancias puede provocar una intensa reacción química, con riesgos
de explosión.
Retire, apague o desconecte todas las fuentes de ignición; asegure el
interruptor de la pared con cinta. No fume en el área de pulverización.
Nunca llene el estanque de combustible mientras el motor estéen
marcha o caliente.
Ponga a tierra el pulverizador, el objeto que recibe el chorro pulverizado,
las cubetas de pintura y disolvente.
Sostenga firmemente la pistola a un lado de la cubeta puesta a
tierra cuando dispare dentro de ella.
Use solamente mangueras para pintura conductora sin aire.
Nunca haga andar el motor dentro de un área cerrada.
¡La inyección de fluido en la piel es una lesión seria! Si fluido de
alta presión le penetra la piel, la lesión podría parecer “sólo un
corte”. ¡Es una lesión seria! Consulte de inmediato al médico.
Para prevenir la inyección en la piel, siempre:
Enganche el seguro del gatillo cuando no use el pulverizador.
No apunte la pistola ni a símismo ni a los demás.
Alivie la presión antes de inspeccionar o reparar cualquier filtración.
Alivie la presión cuando apague el pulverizador o deje de usarlo.
No use componentes cuya capacidad nominal sea inferior a la
presión máxima de operación del sistema.
No permita que niños usen esta unidad. Si se lesiona usando este
equipo, sométase de inmediato a tratamiento médico.
ADVERTÊNCIA
Poderáocorrer incêndio e explosão quando for pulverizado ou injetado
líquido inflamável numa área onde houver mácirculação de ar; vapores
inflamáveis poderão incendiar-se a partir de uma chama ou fagulhas a
descoberto.
Para ajudar a evitar incêndio e explosão:
Utilize no exterior ou numa área muito bem ventilada.
Não utilize 1,1,1–tricloroetano, cloreto de metileno, outros solventes de
hidrocarbonetos halogenados ou líquidos contendo tais solventes em
equipamento de alumínio pressurizado. Tal utilização poderáresultar
numa reação química, com possibilidade de explosão.
Retire, elimine ou desligue todas as fontes de ignição; coloque fita
adesiva na tomada da parede. Não fume na área de pulverização.
Nunca abasteça o depósito de combustível com o motor em funciona-
mento ou quente.
Ponha em contato com a terra o pulverizador, o objeto a ser pulveriza-
do, e os baldes de tinta e de solventes.
Segure a pistola firmemente de encontro ao lado de um balde em contato
com a terra, quando estiver descarregando para dentro do mesmo.
Utilize somente tubos flexíveis condutores para pintura a alta pressão.
Nunca faça funcionar o motor numa área fechada.
A injeção de líquido éum ferimento grave! Se o líquido a alta pres-
são penetrar na sua pele, o ferimento poderáparecer “simplesmente
um corte”. Mas éum ferimento grave! Procure o médico imediatamente.
Para ajudar a evitar injeção de líquido, faça sempre o seguinte:
Engate o trinco de segurança do gatilho quando não estiver pulveri-
zando.
Sempre aponte a pistola para longe de vocêmesmo(a) ou de outras
pessoas.
Alivie a pressão antes de verificar ou reparar qualquer vazamento.
Alivie a pressão quando desligar o pulverizador ou parar de pulverizar.
Não utilize componentes classificados para uma pressão nominal
inferior àpressão máxima de trabalho dos sistemas.
Nunca permita que crianças utilizem esta unidade. Se sofrer algum
ferimento durante a utilização deste equipamento, procure o médico
imediatamente.

3824191
Component Identification and Function
K
E
H
B
A
D
J
G
F
V
8050A
Fig. 1
U
N
M
PR T S
AMotor DC motor, permanent magnet, totally enclosed, fan cooled
BDrive Assembly Transfers power from DC motor to displacement pump
DDisplacement Pump Transfers fluid to be sprayed from source through spray gun
EFluid Outlet Spray gun is connected here
FPrime Valve Used to prime and drain sprayer (also relieves fluid outlet pressure) when
open
GFluid Filter Final filter of fluid to spray gun
HPressure Adjusting Knob Controls fluid outlet pressure
JPressure Control Controls motor speed to maintain fluid outlet pressure at displacement pump
outlet. Works with pressure adjusting knob.
KON/OFF Switch Power switch that controls main power to sprayer
M50 ft (15 m) Main Hose 1/4 in. ID, grounded, nylon hose with spring guards on both ends
NSpray Gun High pressure spray gun with gun safety latch
PRAC 5 Switch Tip Uses high pressure fluid to clear tip clogs without removing tip from spray gun
RHandTiteTip Guard Tip guard reduces risk of injection injury
SThumb Lock Safety Gun safety latch inhibits accidental triggering of spray gun
TPower Cord Rack Holds wrapped power cord for storage
USuction Hose Transfers fluid to be sprayed from source to pump
VDrain Tube Fluid outlet used to drain and prime the sprayer

4824191
General Repair Information
Pressure Relief Procedure
WARNING
INJECTION HAZARD
System pressure must be manually
relieved to prevent system from starting
or spraying accidentally. Fluid under high
pressure can be injected through skin and cause
serious injury. To reduce risk of injury from injec-
tion, splashing fluid, or moving parts, follow Pres-
sure Relief Procedure whenever you:
are instructed to relieve pressure,
stop spraying,
check or service any system equipment,
or install or clean spray tip.
1. Lock gun safety latch.
2. Turn ON/OFF switch to OFF.
3. Unplug power supply cord.
4. Unlock gun safety latch. Hold metal part of gun
firmly to grounded metal pail. Trigger gun to relieve
pressure.
5. Lock gun safety latch.
6. Open pressure drain valve. Leave pressure drain
valve open until ready to spray again.
If suspected that spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following steps above, VERY SLOWLY loosen tip
guard retaining nut or hose end coupling to relieve
pressure gradually, then loosen completely. Now clear
tip or hose obstruction.
CAUTION
To reduce risk of pressure control malfunction:
Use needle nose pliers to disconnect wire. Never
pull on wire, pull on connector.
Mate wire connectors properly. Center flat blade of
insulated male connector in female connector.
Route wires carefully to avoid interference with
other connections of pressure control. Do not pinch
wires between cover and control box.
1. Keep all screws, nuts, washers, gaskets, and
electrical fittings removed during repair
procedures. These parts are not normally provided
with replacement assemblies.
WARNING
ELECTRIC SHOCK HAZARD
MOVING PARTS HAZARD
To reduce risk of serious injury, including
electric shock, do not touch moving or
electrical parts with fingers or tools while
testing repair. Shut off and unplug spray-
er when inspection is complete. Install all
covers, gaskets, screws and washers
before operating sprayer.
2. Test repair after problem is corrected.
3. If sprayer does not operate properly, review
repair procedure to verify procedure was done
correctly. If necessary, see Troubleshooting Guide,
pages 5 –9, for other possible solutions.
WARNING
HOT SURFACES HAZARD
EXPLOSION HAZARD
Motor and drive housing may be very hot
during operation and could burn skin if
touched.
Flammable materials spilled on hot, bare
motor could cause fire or explosion.
Have motor shroud in place during
operation to reduce risk of burns, fire or
explosion.
CAUTION
Do not run sprayer dry for more than 30 seconds to
avoid damaging pump packings.
4. Install motor shroud before operation of
sprayer and replace if damaged. Motor shroud
directs cooling air around motor to prevent
overheating. It can also reduce risk of burns, fire or
explosion; see preceding WARNING.

5824191
Grounding
WARNING
Improper installation or alteration of grounding plug
results in risk of electric shock, fire or explosion
that could cause serious injury or death.
1. All models require a 60 Hz, 15A circuit with a
120 Vac grounding receptacle. See Fig. 2.
2. Do not alter ground prong or use adapter. Fig. 2
Grounding Plug Grounded
Outlets
3. A 12 AWG, 3-wire with grounding prong, 300 ft
(90 m) extension cord may be used. Long lengths
reduce sprayer performance.
Troubleshooting
Relieve pressure;page 4.
MOTOR WON’T OPERATE
TYPE OF PROBLEM WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Basic Fluid Pressure
Problems
1. Pressure control knob setting. Motor will not
run if at minimum setting (fully counterclock-
wise).
1. Slowly increase pressure setting to see if mo-
tor starts.
2. Spray tip or fluid filter may be clogged. 2. Relieve pressure and clear clog or clean fil-
ter; refer to separate gun or tip instruction
manual.
Basic Mechanical
Problems
1. Pump (13) for frozen or hardened paint. 1. Thaw sprayer if water or water-based paint
has frozen in sprayer. Place sprayer in warm
area to thaw. Do not start sprayer until
thawed completely. If paint hardened (dried)
in sprayer, replace pump packings. See
page 17 (Displacement Pump Replace-
ment).
2. Displacement pump connecting rod pin (9a).
Pin must be completely pushed into connect-
ing rod (9) and retaining spring (9b) must be
firmly in groove of pump pin. See Fig. 10.
2. Push pin into place and secure with spring re-
tainer.
3. Motor (1). Remove drive housing assembly
(10). See page 15. Try to rotate fan by hand.
3. Replace motor (1) if fan won’t turn. See page
16.
Basic Electrical Problems 1. Motor control board. Board shuts down and
displays error code.
1. See Motor Control Board Diagnostics,
page 13.
2. Electrical supply. Meter must read
85–130 Vac.
2. Reset building circuit breaker; replace build-
ing fuse. Try another outlet.
3. Extension cord. Check extension cord conti-
nuity with volt meter.
3. Replace extension cord.
4. Sprayer power supply cord (79). Inspect for
damage such as broken insulation or wires.
4. Replace power supply cord.

6824191
Troubleshooting
MOTOR WON’T OPERATE (Continued)
TYPE OF PROBLEM WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Basic Electrical Problems
(continued)
1.That motor leads are securely fastened and
properly mated.
1. Replace loose terminals; crimp to leads. Be
sure terminals are firmly connected.
Clean circuit board terminals. Securely re-
connect leads.
2. For loose motor brush lead connections and ter-
minals. See page 10.
2. Tighten terminal screws. Replace brushes if
leads are damaged. See page 10.
3. Brush length which must be 1/2 in. minimum.
See page 10.
NOTE:Brushes do not wear at the same rate on
both sides of motor. Check both brushes.
3. Replace brushes. See page 10.
4. For broken or misaligned motor brush springs.
Rolled portion of spring must rest squarely on
top of brush. See page 10.
4. Replace spring if broken. Realign spring with
brush. See page 10.
5. Motor brushes may be binding in brush holders.
See page 10.
5. Clean brush holders. Remove carbon with
small cleaning brush. Align brush leads with
slot in brush holder to assure free vertical
brush movement.
6. Motor armature commutator for burn spots,
gouges and extreme roughness.
See page 10.
6. Remove motor and have motor shop resur-
face commutator if possible. See page 16.
7. Motor armature for shorts using armature tester
(growler) or perform spin test. See page 10.
7. Replace motor. See page 16.
Refer to wiring diagram on
page 12 to identify test
points (TP).
1. Power supply cord (79). Connect volt meter be-
tween TP1 (neutral) and TP2 (L2, 120 Vac).
Plug in sprayer. Meter must read 85–130 Vac.
Unplug sprayer.
1. Replace power supply cord.
2. ON/OFF switch (23). Connect volt meter be-
tween L1 and L2 terminal on ON/OFF switch.
Plug in sprayer and turn ON. Meter must read
85–130 Vac.
2. Replace ON/OFF switch. See page 12.
3. Motor thermal cutoff switch. Turn sprayer OFF.
Check for continuity between TO1 and TO2 with
ohmmeter.
3. If thermal switch is open (no continuity), allow
motor to cool. If switch remains open after
motor cools, replace motor. If thermal switch
closes after motor cools, correct cause of
overheating.
4. All terminals for damage or loose fit. 4. Replace damaged terminals and reconnect
securely.

7824191
Troubleshooting
LOW OR FLUCTUATING OUTPUT
TYPE OF PROBLEM WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Low Output 1. For worn spray tip. 1. Follow Pressure Relief Procedure Warn-
ing, then replace tip. See your separate
gun or tip manual.
2. Verify pump does not continue to stroke when
gun trigger is released.
2. Service pump. See page 17.
3. Filter clogged. 3. Relieve pressure. Check and clean filter.
4. Prime valve leaking. 4. Relieve pressure. Repair prime valve.
5. Suction hose connections. 5. Tighten any loose connections.
6. Electrical supply with volt meter.
Meter must read 85–130 Vac. Low voltages re-
duce sprayer performance.
6. Reset building circuit breaker; replace
building fuse. Repair electrical outlet or try
another outlet.
7. Extension cord size and length; must be at least
12 gauge wire and no longer than 300 ft. Longer
cord lengths reduce sprayer performance.
7. Replace with a correct, grounded exten-
sion cord.
8. Leads from motor to pressure control circuit
board (35) for damaged or loose wires or con-
nectors. Inspect wiring insulation and terminals
for signs of overheating.
8. Be sure male terminal blades are centered
and firmly connected to female terminals.
Replace any loose terminal or damaged
wiring. Securely reconnect terminals.
9. For loose motor brush leads and terminals. See
page 10.
9. Tighten terminal screws. Replace brushes
if leads are damaged. See page 10.
10.For worn motor brushes which must be 1/2 in.
minimum. See page 10.
10. Replace brushes. See page 10.
11.For broken and misaligned motor brush
springs. Rolled portion of spring must rest
squarely on top of brush.
11.Replace spring if broken. Realign spring
with brush. See page 10.
12.Motor brushes for binding in brush holders. See
page 10.
12.Clean brush holders, remove carbon dust
with small cleaning brush. Align brush lead
with slot in brush holder to assure free verti-
cal brush movement.
13.Low stall pressure. 13. Do either or both:
a. Turn pressure control knob fully
clockwise. Make sure pressure
control knob is properly installed
to allow full clockwise position.
b. Try a new transducer.
14.Motor armature for shorts by using an armature
tester (growler) or perform spin test. See page
10.
14.Replace motor. See page 16.

8824191
Troubleshooting
LOW OR FLUCTUATING OUTPUT
TYPE OF PROBLEM WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Motor runs and pump strokes 1. Paint supply. 1. Refill and reprime pump.
2. Intake strainer clogged. 2. Remove and clean, then reinstall.
3. Suction tube or fittings loose. 3. Tighten; use thread sealant or sealing tape
on threads if necessary.
4. To see if intake valve ball and piston ball are
seating properly. See page 17.
4. Remove intake valve and clean. Check
balls and seats for nicks; replace if neces-
sary, page 17. Strain paint before using to
remove particles that could clog pump.
5. Leaking around throat packing nut which may
indicate worn or damaged packings. See
page 17.
5. Replace packings, page 17. Also check
piston valve seat for hardened paint or
nicks and replace if necessary. Tighten
packing nut/wet-cup.
6. Pump rod damage. 6. Repair pump, page 17.
Motor runs but pump does not
stroke
1. Displacement pump pin (9a) (damaged or
missing), page 17.
1. Replace pump pin if missing. Be sure re-
tainer spring (9b) is fully in groove all
around connecting rod, page 17.
2. Connecting rod assembly (9) for damage,
page 15.
2. Replace connecting rod assembly,
page 15.
3. Gears or drive housing, page 15. 3. Inspect drive housing assembly and gears
for damage and replace if necessary,
page 15.

9824191
Troubleshooting
MOTOR IS HOT AND RUNS INTERMITTENTLY
TYPE OF PROBLEM WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Motor is hot and runs intermit-
tently.
1. Determine if sprayer was operated at high
pressure with small tips, which causes low
motor RPM and excessive heat build up.
1. Decrease pressure setting or increase tip
size.
2. Be sure ambient temperature where sprayer
is located is no more than 90F and sprayer
is not located in direct sun.
2. Move sprayer to shaded, cooler area if pos-
sible.
ELECTRICAL SHORT
TYPE OF PROBLEM WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Building circuit breaker opens
as soon as sprayer switch is
turned on.
1. All electrical wiring for damaged insulation,
and all terminals for loose fit or damage. Also
wires between pressure control and motor.
See page 16.
1. Repair or replace any damaged wiring or
terminals. Securely reconnect all wires.
2. For missing inspection plate gasket (see page
16), bent terminal forks or other metal to metal
contact points which could cause a short.
2. Correct faulty conditions.
3. Motor armature for shorts. Use an armature
tester (growler) or perform spin test. See page
10. Inspect windings for burns.
3. Replace motor. See page 16.
4. Motor control board (35) by performing motor
control board diagnostics on page 13. If diag-
nostics indicate, substitute with a good board.
CAUTION: Do not perform this check until
motor armature is determined to be good. A
bad motor armature can burn out a good
board.
4. Replace with a new pressure control board
(35). See page 13.
1. Basic Electrical Problems on page 5. 1. Perform necessary procedures.
2. ON/OFF switch (23) See page 12. Be sure
sprayer is unplugged! Disconnect wires from
switch. Check switch with ohmmeter. Reading
must be infinity with ON/OFF switch OFF, and
zero with switch ON.
2. Replace ON/OFF switch. See page 12.
3. For damaged or pinched wires in pressure
control. See page 13.
3. Replace damaged parts. See page 13.
Sprayer quits after sprayer op-
erates for 5 to 10 minutes.
1. Basic Electrical Problems on page 5. 1. Perform necessary procedures.
2. Electrical supply with volt meter.
Meter must read 85–130 Vac.
2. If voltage is too high, do not operate
sprayer until corrected.
3. Tightness of pump packing nut. Over tighten-
ing tightens packings on rod, restricts pump
action, and damages packings.
3. Loosen packing nut. Check for leaking
around throat. Replace pump packings, if
necessary. See page 17.
.
CAUTION
Any short in any part of the
motor power circuit will cause
the control circuit to inhibit
sprayer operation. Correctly
diagnose and repair all shorts
before checking and replac-
ing control board.
Building circuit breaker opens
as soon as sprayer is plugged
into outlet and sprayer is NOT
turned on.

10 824191
Spin Test
Setup
Electric Shock Hazard; page 4.
To check armature, motor winding and brush electrical
continuity:
1. Relieve pressure;page 4.
2. Remove drive housing; page 15.
3. Fig. 3. Remove pressure control cover (39).
Disconnect motor leads (F) and (G).
4. Fig. 4. Remove motor shroud (74) and inspection
covers (A).
Armature Short Circuit Test
Quickly turn motor fan by hand. If no electrical shorts,
motor coasts two or three revolutions before complete
stop. If motor does not spin freely, armature is
shorted. Replace motor; page 16.
Armature, Brushes, and Motor Wiring Open
Circuit Test (Continuity)
1. Connect red and black motor leads together with
test lead. Turn motor fan by hand at about two
revolutions per second.
2. If uneven or no resistance, check for: broken brush
springs, brush leads, motor leads; loose brush
terminal screws, motor lead terminals; worn
brushes. Repair as needed; page 10.
3. If still uneven or no resistance, replace motor;
page 16.
9578A
Fig. 3
F
G
39
Motor Brush Replacement
Motor Brush Removal
Replace brushes worn to less than 1/2 in. Brushes
wear differently on each side of motor, check both
sides. Brush Repair Kit 236967 is available. Spring
clip, 112766, may be purchased separately.
1. Read General Repair Information; page 4.
2. Relieve pressure;page 4.
3. Fig. 4. Remove motor shroud (74) and two
inspection covers (A).
(Continued on page 11)
A
74
Fig. 4
7703B

11824191
Motor Brush Replacement
4. Fig. 5. Push in spring clip (A) to release hook (B)
from brush holder (C). Pull out spring clip (A).
5. Fig. 5. Pull brush lead (D) out of terminal (E).
Remove brush (F).
Fig. 5
A
B
E
D
F
C
1
1
Motor lead; do not disconnect
2Minimum 0.5”(12.5 mm)
03881
3Included in Brush Repair Kit
3
2
6. Inspect commutator for excessive pitting, burning
or gouging. A black color on commutator is normal.
Have commutator resurfaced by a motor repair
shop if brushes wear too fast.
Motor Brush Installation
CAUTION
When installing brushes, follow all steps carefully to
avoid damaging parts.
1. Fig. 6. Install new brush (F) with lead into brush
holder (C).
2. Fig. 5. Slide brush lead (D) into terminal (E).
3. Fig. 6. Install spring clip (A). Push down to set
hook (B) into brush holder (C).
Fig. 6 03881
1
B
C
E
F
4. Repeat for other side.
5. Test brushes.
a. Remove pump (13); Displacement Pump
Replacement, page 17.
b. With sprayer OFF, turn pressure control knob
fully counterclockwise to minimum pressure.
Plug in sprayer.
c. Turn sprayer ON. Slowly increase pressure
until motor is at full speed.
CAUTION
Do not run sprayer dry for more than 30 seconds
while checking brushes to avoid damaging displace-
ment pump packings.
6. Install brush inspection covers and gaskets.
7. Break in brushes.
a. Operate sprayer 1 hour with no load.
b. Install pump (13); Displacement Pump Re-
placement, page 17.

12 824191
On/Off Switch Replacement
Removal
1. Relieve pressure;page 4.
2. Fig. 7. Remove four screws (18) and pressure
control cover (39).
3. Disconnect two wires (A) from ON/OFF
switch (23).
4. Remove toggle boot (25) and locking ring (24).
Remove ON/OFF switch (23).
Installation
1. Install new ON/OFF switch (23). Install locking ring
(24) and toggle boot (25).
2. Connect two wires (A) to ON/OFF switch.
3. Install pressure control cover (39) with four
screws (18).
9580A
Fig. 7
39
A
18
23 36
52
E
D
35
36
25
24
37
ON/OFF
Switch
Power
Plug
Potentiometer
from Motor
Red (+)
Yellow
White
Black
Green
Black (–)
Pressure
Transducer
Ref 60
Ref 23
Ref 29
Ref 26
Ref 52
Ref 34
9535A
Wiring Diagram
TP1
L2 L1

13824191
Pressure Control Repair
Motor Control Board
Removal
Refer to Fig. 7.
1. Relieve pressure;page 4.
2. Remove four screws (18) and cover (39).
3. Disconnect at motor control board (35):
Four motor leads: two yellow, black (+) and
red (–).
Lead (D) from potentiometer.
Lead (E) from transducer.
4. Remove five screws (36) and circuit board (35).
Installation
1. Clean pad on rear of motor control board. Apply
small amount of thermal compound 073019 to pad.
2. Fig. 7. Install motor control board (35) with five
screws (36).
3. Connect to motor control board (35):
Lead (E) to transducer.
Lead (D) to potentiometer.
Four motor leads: two yellow, black (+) and
red (–).
4. Bundle and tie all loose wires.
5. Install cover (39) with four screws (18).
Motor Control Board Diagnostics
Note: Keep a new transducer on hand to use for test.
CAUTION
Do not allow sprayer to develop fluid pressure with-
out transducer installed. Leave drain valve open if
test transducer is used.
1. Remove four screws (18) and cover (39).
See Fig. 7.
2. Turn ON/OFF switch ON.
3. Observe LED operation and reference following
table:
4. Relieve pressure and un-
plug sprayer before servic-
ing control board;page 4.
LED
BLINKS SPRAYER OPERATION INDICATES WHAT TO DO
Once Sprayer runs Normal operation Do nothing
Two times
repeatedly
Sprayer shuts down and LED
continues to blink two times
repeatedly
Run away pressure. Pres-
sure greater than 4500 psi
(310 bar, 31 MPa).
Replace motor control board.
See preceding Motor control
board removal procedure.
Three times
repeatedly
Sprayer shuts down and LED
continues to blink three times
repeatedly
Pressure transducer is
faulty or missing
Check transducer connection.
Open drain valve. Substitute
new transducer for transducer
in sprayer. If sprayer runs,
replace transducer.
Four times
repeatedly
Sprayer shuts down and LED
continues to blink four times
repeatedly
Line voltage is too high Check for voltage supply
problems
Five times
repeatedly
Sprayer shuts down and LED
continues to blink five times
repeatedly
Too much current Check for locked rotor, worn
motor brushes, or shorted
wiring or motor. Repair or
replace failed parts.

14 824191
Pressure Control Repair
Pressure Control Transducer
Removal
Refer to Fig. 7.
1. Relieve pressure;page 4.
2. Remove four screws (18) and cover (39).
3. Disconnect lead (E) from motor control
board (35).
4. Remove two screws (22) and filter housing (45).
5. Thread transducer lead plastic connector down
through transducer grommet (28).
6. Remove pressure control transducer (52) and
packing o-ring (51) from filter housing.
Installation
1. Install packing o-ring (51) and pressure control
transducer (52) in filter housing (45). Torque to
30–35 ft-lb.
2. Thread transducer lead plastic connector up
through transducer grommet (28).
3. Install filter housing (45) with two screws (22).
4. Connect lead (E) to motor control board (35).
5. Install cover (39) with four screws (18).
Pressure Adjust Potentiometer
Removal
Refer to Fig. 7.
1. Relieve pressure;page 4.
2. Remove four screws (18) and cover (39).
3. Disconnect all leads from motor control board (35).
4. Remove five screws (36) and board (35)
5. Remove potentiometer knob (27), sealing shaft nut
(33) and pressure adjust potentiometer (26).
Installation
1. Install pressure adjust potentiometer (26), sealing
shaft nut (33) and potentiometer knob (27).
a. Turn potentiometer fully clockwise.
b. Install knob at full clockwise position.
2. Install board (35) with five screws (36).
3. Connect all leads to motor control board (35).
4. Install cover (39) with four screws (18).

15824191
Drive Housing Replacement
CAUTION
Do not drop gear cluster (7) when removing drive
housing (10). Gear cluster may stay engaged in
motor front end bell or drive housing.
Disassembly
1. Relieve pressure;page 4.
2. Remove pump (13); Displacement Pump
Replacement, page 17.
3. Fig. 8. Tip sprayer up. Remove screw (74c) and
remove shroud (74).
4. Remove two front screws (22).
5. Remove two back screws (22).
6. Pull drive housing (10) off of motor (1).
Assembly
1. Push drive housing (10) onto motor (1)
2. Install two front screws (22).
3. Install two back screws (22).
4. Fig. 8. Tip sprayer up. Install shroud (74) with
screw (74c).
5. Install pump (13); Displacement Pump
Replacement, page 17.
6. Instal new access cover (10a) with two screws
(10b).
10
22
1
Fig. 8
A
74
74c
22
74c
7
10a
10b
9581A
9582A

16 824191
Motor Replacement
Disassembly
1. Relieve pressure;page 4.
2. Remove pump (13); Displacement Pump
Replacement, page 17.
CAUTION
Do not drop gear cluster (7) when removing drive
housing (10). Gear cluster may stay engaged in
motor front end bell or drive housing.
3. Remove drive housing (10); Drive Housing
Replacement, page 15.
4. Remove four screws (18) and cover (39).
5. Disconnect all leads from board (35). Remove five
screws (36) and board.
6. Remove strain relief (37, page 12, 13, 14).
7. Remove three screws (22) behind board and
remove control housing (21).
8. Remove four screws (22) and motor (1) from
frame (63).
Assembly
1. Install new motor (1) on frame (63) with four
screws (22).
2. Install control housing (21) with three screws (22).
3. Install strain relief (37, page 12, 13, 14).
4. Install board (35) with five screws (36). Connect all
leads to board (35).
5. Install drive housing (10); Drive Housing
Replacement, page 15.
6. Install pump (13); Displacement Pump
Replacement, page 17.
Fig. 9
22
1
7699B
1Liberally apply grease
39
1
18
36
35
22 1

17824191
Displacement Pump Replacement
See manual 309053 for pump repair instructions.
See manual 309057 or 309058 for sprayer part number references.
Removal
1. Flush pump (13).
2. Relieve pressure;page 4.
3. Fig. 10. Loosen two screws (10b) and rotate
cover (10a).
Fig. 10
10a
10b
9a
9573A
4. Cycle pump until pump pin (9a) is in position to be
removed. Remove pump pin (9a).
5. Fig. 11. Remove suction tube (78) and hose (19).
6. Loosen pump jam nut (12). Unscrew pump.
Fig. 11
78
12
9574A
19
Installation
WARNING
If pin works loose, parts could break off due to
force of pumping action. Parts could project
through the air and result in serious injury or prop-
erty damage.
CAUTION
If the pump locknut loosens during operation, the
threads of the drive housing will be damaged.
1. Fig. 12. Extend pump piston rod fully. Apply grease
to top of pump rod at (A) or inside connecting rod.
Fig. 12 9575A
A
2. Fig. 10. Install pump pin (9a). Verify retainer spring
(9b) is in groove of pump pin.
3. Push pump up until pump threads engage.
4. Screw in pump until threads are flush with drive
housing opening. Align pump outlet to back.
5. Fig. 11. Install suction tube (78) and hose (19).
6. Fig. 13. Screw jam nut (12) up onto pump until nut
stops. Tighten jam nut by hand, then tap 1/8 to 1/4
turn with a 20 oz (maximum) hammer to
approximately 75"5 ft–lb (102 Nm).
Fig. 13 9576A
7. Fig. 14. Fill packing nut with Throat Seal Liquid
(TSL) until fluid flows onto top of seal.
Fig. 14 9577A
10a
10b
8. Fig. 10. rotate cover (10a); tighten screws (10b).

18 824191
Technical Data
Model
(120V)
∅, A, Hz
Generator
Minimum
W
Motor HP
(W)
Cycles per
gallon (liter)
Maximum
Delivery gpm
(lpm)
Maximum
Tip size
Fluid Outlet
npsm
NOVA 1, 15, 60 3000 1/2 (373) 680 (180) 0.38 (1.25) 0.019 1/4 in.
NOVApro 1, 15, 60 3400 5/8 (466) 680 (180) 0.46 (1.74) 0.021 1/4 in
SuperNOVApro 1, 15, 60 3750 3/4 (560) 680 (180) 0.54 (2.09) 0.023 1/4 in
Basic Sprayer Wetted Parts:
zinc-plated carbon steel, polyurethane, polyethylene, stainless steel, PTFE,Delrin, chrome plating, leather, V-Max
UHMWPE, aluminum, stainless steel, tungsten carbide
NOTE: Delrinis a registered trademarks of the Co.
Dimensions
Weight lb (kg)
Height: Length: Width:
Model NOVA NOVApro SuperNOVApro
Height:
in. (cm)
Length:
in. (cm)
Width:
in. (cm)
Stand 39 (18) 41 (19) 43 (20) 21 (53.3) 15 (38.1) 14 (35.6)
Lo–Boy N/A N/A 61 (28) 21 (53.3) 26 (66.0) 20.5 (52.1)
Hi-Boy 57 (26) 59 (27) 66 (30) Handle down:
29.5 (74.9)
Handle up:
39.5 (100.3)
21 (53.3) 20.5 (52.1)

19824191
Sherwin-Williams Standard Warranty
Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from
defects in material and workmanship on the date of sale by an authorized Graco distributor to the original purchaser for use. With the
exception of any special, extended, or limited warranty published by Graco, Graco will, for a period of twelve months from the date of
sale, repair or replace any part of the equipment determined by Graco to be defective. This warranty applies only when the equipment
is installed, operated and maintained in accordance with Graco’s written recommendations.
This warranty does not cover, and Graco shall not be liable for general wear and tear, or any malfunction, damage or wear caused by
faulty installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or sub-
stitution of non–Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of
Graco equipment with structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture,
installation, operation or maintenance of structures, accessories, equipment or materials not supplied by Graco.
This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for
verification of the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The
equipment will be returned to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect
in material or workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor, and
transportation.
THIS WARRANTY IS EXCLUSIVE, AND IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other
remedy (including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any
other incidental or consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the
date of sale.
GRACO MAKES NO WARRANTY, AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE, IN CONNECTION WITH ACCESSORIES, EQUIPMENT, MATERIALS OR COMPONENTS SOLD
BUT NOT MANUFACTURED BY GRACO. These items sold, but not manufactured by Graco (such as electric motors, switches,
hose, etc.), are subject to the warranty, if any, of their manufacturer. Graco will provide purchaser with reasonable assistance in mak-
ing any claim for breach of these warranties.
In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment
hereunder, or the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract,
breach of warranty, the negligence of Graco, or otherwise.
FOR GRACO CANADA CUSTOMERS
The parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings
entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties reconnais-
sent avoir convenu que la rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires
exécutés, donnés ou intentés àla suite de ou en rapport, directement ou indirectement, avec les procedures concernées.
ADDITIONAL WARRANTY COVERAGE
Graco does provide extended warranty and wear warranty for products described in the “Graco Contractor Equipment Warranty
Program”.

20 824191
Phone Number
TO PLACE AN ORDER OR FOR SERVICE, contact your Graco distributor, or call 1–800–690–2894 to
identify the nearest distributor.
All written and visual data contained in this document reflect the latest product information available at the time of publication.
Graco reserves the right to make changes at any time without notice.
The SHERWIN–WILLIAMS COMPANY, 101 PROSPECT AVENUE, CLEVELAND, OHIO 44115
PRINTED IN U.S.A. 824191 5/2001, Revised 12/2001