Sherwin-Williams 820-248 Series A Owner's Manual download pdf (Page 13)

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Troubleshooting

WARNING

INJECTION HAZARD

o reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the

Pressure Relief Procedure

on page 9.

Basic Problem Solving

Check

everything in the troubleshooting table before disassembling the sprayer

TYPE OF PROBLEM WHA

T T

O CHECK

If check is OK, go to next check

WHA

T T

O DO

When check is not OK, refer to this column

Fluid pressure

Check pressure control knob setting. The pump

won’t develop much pressure if it is at minimum

setting (fully counterclockwise).

Slowly increase pressure setting to see if

motor starts.

Check for a clogged spray tip or fluid filter

, if

used. See page 8.

If tip is still clogged, relieve pressure; re

fer to separate gun or tip instruction

man

ual for tip cleaning. Clean or replace filter

element. See manual 308–429.

Mechanical

Check for frozen or hardened paint in pump

(20). Using a screwdriver

, carefully try to rotate

fan at back of motor by hand. See page 17.

Thaw

. Plug in sprayer and turn on.

Slowly increase pressure setting to see if

motor starts. If it doesn’t, see NOTE, be

low.

Check pump connecting rod pin (17). It must be

completely pushed into connecting rod (15),

and retaining spring (18) must be firmly in con

necting rod groove. See Fig. 17, page 21.

Push pin into place and secure with

spring retainer

Check for motor damage. Remove drive hous

ing assembly (1

1). See page 27. T

ry to rotate

motor fan by hand.

Replace motor (4) if fan won’t turn. See

page 25.

Electrical 1.

Check electrical supply with volt meter

. Meter

should read 105–125 V

AC.

Reset building circuit breaker; replace

building fuse. T

ry another outlet.

Check extension cord for visible damage. Use

a volt meter or test lamp at extension cord out

let to check.

Replace extension cord.

3. Check sprayer power supply cord (50) for vis-

ible damage such as broken insulation or wires.

Replace power supply cord.

See page 26.

Check motor brushes for the following:

Loose terminal screws.

Broken or misaligned brush springs.

Brushes binding in holders.

Broken leads.

e. W

orn brushes.

NOTE:

The brushes do not wear at same rate

on both sides of motor

. Check both brushes.

Refer to page 19.

a. Tighten.

Replace broken spring and/or align

spring with brush

Clean brush holders. Remove carbon

with small cleaning brush. Align brush

leads with slot in brush holder to as

sure free vertical brush movement.

Replace brushes

Replace brushes if less than 0.5 in.

long.

NOTE:

Thaw sprayer if water or water–based paint has frozen in it, due to exposure to low temperatures, by placing in a warm

area. Do not try to start sprayer until completely thawed or damage to motor and/or start board may occur

. If paint hardened

(dried) in sprayer

, the pump packings (page 21) and/or pressure transducer (page 30) must be replaced.

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Sherwin-Williams 820-248 Series A Owner's Manual Page 13

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