Graco EM 380 Operation manual

INSTRUCTIONS-PARTS

LIST

307-371

Rev.

C

OnAco

SUPERSEDES

B

SERVICE INSTRUCTIONS

FOR

EM

380

PORTABLE ELECTRIC/AlRLESS

PAINT

SPRAYE,R

Model

226-820

GRACO INC.

P.O.

BOX

1441

MINNEAPOLIS.

MN

55440

@

COPYRIGHT

1980

GRACO

INC.

Table

of

Contents

Page

Troubleshooting.. .....................................

3

Pumps.

..............................................

.4

Connecting

Rod

&

Bearing..

...........................

.6

Drive Assembly..

......................................

.6

Electric Motor.

.......................................

.7

Filter.. ...............................................

.8

Pressure

Control..

....................................

.8

Parts List..

..........................................

.lo

NOTE:

Numbers

in

parentheses in the

text

refer to the reference

numbers on Figs

1-11

and the parts drawing and

list.

WARNING

Before servicing, always shut

off

the

unit,

unplug the power cord and relieve fluid

pressure.

To

relieve pressure, trigger

the

spray gun, engage the trigger

safety

and

open

the

drain valve.

I

UNPLUG

CORD

TRIGGER GUN ENGAGESAFETY

.

OPEN DRAINVALVE

...j

.......

......

.:,

,.J

...

..

-..

2

307-371

.:;:,.:

..

I

...

....

..

-.

.

SERVICE

Service instructions are given

in

the

following

WARNING

paragraphs. Check everything in

the

chart

before

dis-

assembling any part of the sprayer.

Always disconnect sprayer

from

power source

and relieve system pressure beforeanempting

any

service.

...

?

"h

."

.

3OUBLESHOOTING GUIDE

'ROBLEM

ilectric motor won't run

Ilectric

motor stops while spraying

3ectric motor runs but

output

low

ilecaic motor

runs,

but no

output

3ectric motor labors when sarting,

,lowing

fuses

-

'..

'aint leaks into wet-cup

'

.

Scxcessive surge

at

spray gun

..

Not

enough paint pressure

Tails

or fingers

in

spray panem

Paint

NT!S

or sags

Spming from spray gun

Smtic sparking from spray gun

CAUSE

Power cord unplugged,

or

building circuit

fuse

SOLUTION

Check. replace

blown

Overload switch has opened Unplug cord., decrease pressure

Pressure setting

too

low Increase

Power cord unplugged,

or

building circuit fuse Check, replace

blown

Overload switch has opened Unplug.cord*, relieve pressure, allow

Pressure setting

too

low Increase

to

mol,

decrease pressure

-

lip or filter plugged

Piston ball check not seating

Pion packings worn

or

damaged

Intake

Mlve

bail check

not

seating

Disalaceme&

ourno

frozen

or

clear train damanr

_.r

""

~~~~~~~ ~

~~

-

Displacement pump

frozen

or gear train damagf

Capacitor failure ..

...

Throat packings worn or damaged

Tip or filter plugged

Spray tip too big

or

worn

Paint

too'viscous

Wrong

type

hose

..

............

Pressure setting

too

low

Spray tip too big or worn

Pressure setting too low

Outlet filter dirty

or

plugged

spray tip

too

big

or

worn

Paint supply low or pail empty

Paint

too

viscous

Wrong

type

hose

Remove and clean

Service,

see

disp. pump service

I

!+lace,

SF

&sp. pump senrice .

,.

I

Senice,

see

disp. pump service

Thaw**,

replace

Thaw..

...

~

.,-.:

:.;

>::

..,'

.

I

.

....

Replace,

see

dsp. pump service

&move and clean

............

chiiii tip

-

see manual

307-321

~

~n'

:

Use

minimum

50

ft

(15.2

ml static

free

nylon hose only -wire braid hose unac,

ceotable

Increase . .

,

........

~ Change tip

-

see manual

30?-321

InCreasa

. .

Clean

Change tip

-.see

manual

307-321

Fin

Thin

nvlon hose only

-wire braid hose unac.

Use

minimum

50

ft

(15.2 ml

&tic free

. ciptabla

Outlet

filter dirty or plugged

Paint supply

low

or pail empty

Clean-see manual

307273

Fill

Sprayer sucking air or gun needle not seating Tighten fittings,

service

gun

-see

Check, ground

Sprayer or worknot grounded

manual

307445

'The electric motor has an overheating protector switch which automatically resets

on

cooling.

If

it

opens, uvplug unit and

let

it

cool for

30

to

W

minutes.

Also

try

to

correct

the

cause of overheating.

Always

use

the

lowest pressure semng needed.

*.Freezing

results

from failure

to

replace flushing water with mineral spirii solvent.

...

....

..

...

I

.

.,

....

......

...

.....

.

..:

.....

..

...

.... ....

..

.~.

...

..

......

,

..,

.. ....... .............

......

....

.<...

...

;.:.

:....,.......

..

.<,

.:

:

..

....

..............

... ...

.I

.........

...

..

....

...

........

.. ..

'.

I

..

307-371

,:

3

,'

".

..

.. . .~

REMOVING

and REPLACING

PUMP

Flush if possible. Shut

off

sprayer and unplug power

cord, trigger spray gun and open filter drain valve to

release pressure (provide

a

container to catch drainage)

and engage trigger safety.

Loosen hose clamp

(17)

and remove suction hose

(42).

Unscrew sealing

nut

(21)

from pump.

See

Fig

1.

Disconnect tube fitting

18)

from male connector (10).

See

Fig

1.

Use

a

screwdriver to push retaining spring

133)

aside

and push out

(34).

Loosen locknut

(74)

and unscrew pump from drive

assembly

(55).

When installing a new or repaired pump,

fint

rotate

tion. Push pump piston rod (79) all the way down into

crankshaft

so

connecting rod

(54)

is

in

its lowest posi-

pump cylinder

(78).

Screw pump into drive assembly

(55)

until you feel. piston rod pressing against connec-

ting rod. Unscrew pump until outlet lines

up

with outlet

tube

(52).

then unscrew another complete

turn.

Tighten locknut

(741.

Locknut must be very tight to

avoid loosening from vibration.

Align holes in piston rod

(791

and coupling

1361

and

in-

stall pin

(34)

and retaining spring

133).

Reassemble remaining parts, reverse from disassembly.

Fig

1

.

,

...

. .

.

. . . ..

SERVICING

PUMP

(Repair

kit

215902 availablel.

Shut

off

and unplug sprayer, open filter drain valve to

release pressure (provide

a

container to catch drainage)

and engage the trigger safety.

Use

repair

kit

no.

215902

to repair pump.

Use

all

parts

in

kt,

even if old ones look good.

Remove

pump

from sprayer as described above.

Unscrew intake valve

(80)

from cylinder

(78).

If valve is

Disassembling Pump

seized

in

housing, squirt penetrating oil around threads

and

gently

tap

around housing

with

a

light hammer to

loosen.

See

Fig

2

and

4.

Remove ball guide

(721,

stop

(71)

and ball

(601.

Clean and inspect parts for wear

or damage.

NOTE: Test intake valve by filling

it

with solvent and

seeing

if

any leaks past ball.

It

shouldn't

leak. Valve must be clean for this test; any

dirt

will

hold

ball

off

seat and let solvent leak

past.

4

307-371

..

.

..

... .

............

....

Unscrew and remove packing nut (70). Using

a

rubber

'1

'.

Assembling Pump

.'

' '

mallet.

tao niston rod (791 down and

uull

out through When assembling pump, coat packings, piston rod and

..

......

..

,

..

,.

~.

bottom of cylinder 1781.

See

Fig

3

and4.

~~ ~~.

~"

-

inside of cylinder

..

with hydraulic oil.

Remove glands

(66

&

69)

and packings

(67

b

68).

When reassembling piston, inell new glands and pack-

ings in correct order, altematmg leather and plastic

Clean and inspect piston rod and inside of cylinder for packings.

See

Fig 3.

"V"

of packings must face up

nicks, scratches or scoring which could cause leaking or against fluid pressure.

See

Fig 4. Tighten nut

(65)

to

premature wear of packings. 10.5 in-lb (1.2 N.m) to seat packings, then back

off

and

tighten hand tight.

Clamp

flats

of

piston rod in a vise.

Use

a

large

screwdriver to unscrew adapter

(76)

from valve (81).

Remove seal (61) and washers

(77).

See

Fig

3

and 4.

Place

new ball in piston rod

(79).

Apply, locking

corn-

ing

a

torque wrench on nut

165)

and

a

screwdriver on

pound to threads of valve 181

1.

and screw

It

into rod. Us-

Use

a

wrench to loosen nut

(651

and unscrew valve (81) valve (81). tighten nut against piston rod to 18-29 ft-lb

from piston rod. Remove ball

(59).

Remove nut, glands (24-27 N.m) torque,

without changing the tightness

of

(62

&

64)

and packings

(63

&

75).

the nut against packings.

L

Install new seal and washers on adapter 176) and screw

into valve (81).

Install throat packings. glands and packing nut, leaving

packing nut

loose.

"V"

of packings must face down

against fluid pressure. Put plastic packing

(68)

on top of

lnseipiston rod through bottom of

pump

cylinder.

Assemble and install intake valve and tighten packing

nut

just

enough to stop leakage

-

no

tighter.

'

".:

leather packings. ..

.

~. .

....

..

,

L

REMOVING

and

REPLACING CONNECTING

ROD

and

BEARING

Shut

off

and unplug sprayer, trigger spray

gun

and

open filter drain valve to release pressure (provide

a

container

to

catch drainage1 and engage trigger safety.

Remove pump as described above.

Remove the

6

screws

(191

and cover

(35).

Remove the

2

screws and lockwashers

(20

and

18).

Remove bearing

(53)

and connecting rod

(541,

sliding connecting rod

off

of crankshaft.

See

Fig

5.

and remove

1341

from coupling

(36).

Remove coupl-.

Use

a screwdriver to push retaining spring

(331

aside

ing from connecting rod.

use

solvent1 and inspect surfaces of bearing and con-

Pull

connecting rod out of bearing. Wipe clean (don't

necting rod link for wear or damage. If either needs

replacing,

you

should replace both. When installing rod

and bearing, coat surfaces with

SAE

10

non-detergent

motor

oil.,

Clean and inspect crankshaft. Wipe clean

with

a rag; do

not

use

solvent. If crankshaft is badly worn, replace

drive assembly.

Clean and inspect connecting rod needle bearing.

.

Repack bearing with industrial heavy duty extreme

pressure lithium soap grease.

NOTE:

After evely

100

hours

of operation, or

whenever servicing

the

pump

(whichever

comes

first),

fill

the cavity

in

connecting rod

I541

with

SAE

10

non-detergent motor

oil.

Fig

5

..

REMOVING

and

REPLACING DRIVE ASSEMBLY

Shut

off

and

unplug

sprayer, trigger spray gun and

open filter drain valve to release pressure (provide a

container to catch drainage) and engage trigger safety.

Fig

6

307-371

. ..

Remove pump, connecting rod and bearing

as

describ- Clean and inspect gear:

(37)

for wear or damage.

ed above. Replace if necessary.

To

remove, drive out pin

(27)

and

pull

off

of motor shaft. Apply molybdenum disulfide

drive housing

(C).

Remove screws and lockwashers (82

Remove screws and lockwashers (A&B) and remove spray lubricant to gear, allow to dry, then apply

in-

dustrial heavy duty extreme pressure lithium soap

&

83)

and remove motor housing (DL

See

Fig

6.

grease.

.q

...</

Install new drive assembly in reverse order of removal.

REPLACING CAPACITOR

Remove cover

(E)

of capacitor

(91).

See

Fig

7.

Remove

flag connectors from old capacitor. Connect flag con-

NOTE:

The

replacement capacitor includes new

nectors of new capacitor and replace cover.

resistor, installed.

,3

.

-.

...

REMOVING

and

REPLACING'ELECTRIC MOTOR

Shut

off

and unplug sprayer, trigger spray gun and Disconnect red, pink and brown wires from circuit

open filter drain valve to release pressure (provide

a

board

(E).

Disconnect green and yellow wire from

container to catch drainage) and engage trigger safety. grounding screw IF) and black wire from top

of

pressure

control

IG).

Disconnect tube fitting

(8)

from nipple

(101.

See

Fig

1.

Unscrew nuts on both ends of conduit

(1)

from connec-

Remove drive assembly

as

described above.'

You

can

tors.

Remove screws

(7).

nuts

(3)

and lockwashers

(4).

drive assembly.

leave pump, connecting rod and bearing assembled to

guiding wires through 'connector in control box.

See

Fig 7. Remove motor from frame while carefully

Remove conduit

(1)

from wires.

.'

Drive

out

(27)

and remove gear

(37).

See Fig

7.

Loosen locknut and unscrew connector (13)'from

Remove screws

(25)

and cover

(41)

from pressure con- motor, being careful

to

avoid twisting wires.

trol

(50).

See Fig

8.

..

.

,..

......

Install new motor in reverse order of removal.

......

"c

:-?J

\..?

4.-a

:. :.

.

I

.

'

.

..

. .

:

..

._.

.,

..

~.

'a

:,;.:;,

'.

i".

',

..

.I

il

....

......

.!...'.

...

......

.........

...

....

..

,:

..

~.,.

. ..

........

..

. .

I

.....

..

Fig

7

......

Fig

8

~

I.

.....

'

...

.,

,:,

:.;:

,.

,

.

...

..

76

'.,:

. .

..........

....

~. .... ...

U;.._

".

.

..

.i,:i;

;....

....

..::.

.....

..

.. .307-371'

7

REMOVING

and

REPLACING PRESSURE.CONTROL

r

WARNING

.

-.

..

.

. . . . . . . . . ..

.. .. . .

.

,,:

.

(J).

Changing the setting may cause unsafe high

Do

not

alter the factory adjusted pressure switch

pressure or poor performance.

*-?A

.'

Shut-off end unplug sprayer, trigger spray gun and

open

filter

drain valve to release pressure (provide

a

container.to catch drainage) and engage trigger safety.

Disconnect swivel union

(84)

from nipple

(28)

and

unscrew nipple

128)

from pressure control. See Fig

9.

Disconnect tube

(52)

from elbow

(15).

See Fig

10.

Unscrew elbow

(15)

from fitting in pressure control

(50).

pressure

control

(50)

and

filter

147)

from

frame.

Remove screw

15)

and lockwasher

(4)

and remove

.I

Remove screws

(25)

and cover

(41)

from pressure con-

trol

(50).

See

Fig

11.

board

(86).

Disconnect green and yellow wire from

Disconnect red, pink and brown wires from circuit

grounding screw

(FI,

and black wire

from

top of

. pressure control

(GI.

See Fig

11.

'

NOTE

Circuit board

(86)

is not included with pressure

control

(50)

replacement. Order separately

if

new circuit board

is

needed.

Unscrew nut

on

end of conduit

(11

from connectar

(13).

while carefully guiding wires through connector

(131.

See Fig

11.

Pull pressure control

(50)

awayfrom conduit

Loosen knurled part of power cord strain relief

(HI,

and

on power cord to provide clearance, and unscrew con-

unscrew

it

from pressure control. Slide strain relief up

duit connector

(13).

See

Fig

11.

-u

Fig

9

52

Replace in reverse of order of removal.

Fig

10

....

..J

...~..

..

..'...

,

. .

.

..

8

307-371

Fig

11

SSEMBLY PART

REF

PART

:HANGED

''

STATUS

'

NO. NO. NAME

inal

Agpl

OLD

NEW 11

102-556

Rivet

1Md88

Rivat

DL0

OLD

1c5.678 Sew 141

105677

Scm

14)

NEW

26

loMm

scrsw181

OLD

NEW

28

157-350 Nipple

16S198

Nipple

OLD

NEW 41

177-Z9

Cover

176918

Cow

OLD

NEW

82

10625

Lockwasher

1W-133

-Lockwasher

ADD

87 21- Power

cord

88

105659 Switch Boot

ADD

E3

105679

Switch Toggle

ADO

ADD

90

105746 Swin

Rdid

91

105771

Capacitor

ADD

93

1W-m

Capscrew

S2

177-762

Labs1

ADD

DELETE

94

"94

TSL

1W.072 Nut

DELETE

105656

Screw

DELETE 176937 Spacsr

DELETE

DEL-CTE

DELET

103-181 Lockwasher

17691

Label

106516 Nut

lis0

Pump

OLD

176iE

Packing

I21

15453 OLD 176756 Packing

111

ierk

to

C

NEW

68

176997 Packing

13)

NTERCHANGEABILITY

NOTE

NEW

parts replace

)LD

parts

listed directly

above

them.

.

..

.. .

..

.

:

307-371

'j.

9

PARTS

DRAWING

REF

PART

NO.

3

1

4

5

7

9

8

10

11

12

13

14

15

17

18

19

20

P

23

25

n

m

29

30

31

32

3

-34

35

36

38

37

41

40

42

44

45

47

46

48

49

o&ce9

100-188

100214

100-538

101-344

101-907

101-908

101-909

102-556

102-799

102.932

102-99

!@%no

103.927

1W

105-508

105-509

105521

105-524

108075

105-680

157-350

170-113

172412

176250

176524

176817

176818

17-

176-824

176825

176865

176915

177-229

176920

208663

210-561

210-&7

214-530

214-m1

216502

NIPPLE,

hex,

reducing, 3Anpt

x

1

TUBE. wction

PLATE,

designation

LABEL. warning

LABEL.rmming

SPRING,

retaining

COVER,

gear

box

PIN,

rU.

hdis. 0.3125" dia

x

1.023"

COUPLING,

pump

GEAR,

pinion

TUBE.

wction

BRACKET,

mounting

COVER

/4

npt

HOSE,runion,nylon3/4"IDx30"

GUN,airlass,res307"6forpm

1762mml

HOSE. spray: cpld

1/4

npsmifbel

swivel:

1/4"ID:nylon:50f1115ml:rpringguard

oneend:staticfm

VALVE.

ball.see306-861

forpans

FILTER.fluid.res307-mforpns

HOSE,

whip end, cpld V4nptlm)

x

1/4npsmlf1;3/16'IO,staticfres:W'

1914

mml

long

FRAME.spprayer

'

.

..

Ref

No.

50

Includes

1

of

items

13

and

87-90

55

7

DISPIACEMENT PUMP

REPAIR

KIT

217479

(Order

separatehll

1

2

1

Graco EM 380 Operation manual

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