Graco 257815 Manuel utilisateur

313768B

Repair Kit

Piston Repair Kit

257815

- For servicing the piston on FinishPro 290 sprayers -

NOTE: For proper compressor operation, you must also replace

the valve plate assembly (kit 257836) when replacing the piston.

Pressure Relief Procedure

Important Safety Instructions

For detailed instructions and warnings,

see sprayer manual.

To reduce the risk of injury from injection, always follow

this procedure when instructed to relieve pressure,

stop spraying, service equipment, or install or clean

spray tip.

1. Set power/function selection switch to OFF and

unplug sprayer.

2. Turn pressure knob to lowest setting.

3. Hold gun to side of grounded metal pail. Trigger the

gun to relieve pressure.

4. Turn prime valve to PRIME.

If you suspect spray tip or hose is completely clogged, or

that pressure has not been fully relieved after following

these steps, VERY SLOWLY loosen tip guard retaining

nut or hose end coupling to relieve pressure gradually,

then loosen completely. Clear tip or hose obstruction.

ti9346a

ti8943a

2313768B

Disassembly

1. Relieve Pressure (see cover) and unplug sprayer.

2. Remove shroud and compressor:

a. Loosen IEC cord clamp screw and remove IEC

plug from compressor.

b. Remove air hose from compressor and remove

outlet fitting from compressor.

c. Remove four screws. Tip compressor assembly

down and forward to remove from sprayer.

Place compressor on workbench.

d. Remove two screws and IEC cord clamp.

Remove two screws and compressor shroud.

3. Remove cooling tube (71) by loosening cooling tube

nuts (70).

4. Use 1/2 in. socket to remove three bolts (100) from

head (74).

5. Use flat-blade screwdriver to pry head (74) from top

of plate (75) and cylinder (76) from bottom of valve

plate (75).

6. Use 7/32 in. allen wrench to remove hex screw (87)

from piston rod (77).

ti13409a

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100

ti13940a

313768B 3

Reassembly

1. Replace piston (77) and cylinder (76) and use 7/32

in. allen wrench to tighten hex screw (87) into piston

rod.

2. Replace valve plate (75) with ribs facing up toward

head.

3. Replace three bolts (100) and use 1/2 in. socket to

tighten into head (74). Torque all three bolts to 75

in-lb, then torque all bolts again to 210 in-lb.

4. Replace cooling tube (71) by tightening cooling tube

nuts (70).

5. Replace Compressor and shroud:

a. Install compressor shroud with two screws.

Install IEC cord clamp with two screws.

b. Install air inlet fitting.

c. Tip compressor assembly up and back into

frame. Install four screws.

d. Install IEC connector and tighten cord clamp.

Install air hose to outlet fitting. Make sure cord is

pushed in as far as it can go to ensure a good

connection.

NOTICE

Piston and cylinder come

packaged together. Do NOT

let piston and cylinder come

apart. If they do, make sure

you drop the piston down

through the top of the cylinder

and tilt the piston as you pull

it through the cylinder. Do

NOT push the piston up from

the bottom. You could easily

damage the piston gasket. ti8943a

100

ti13414a ti13664a

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4313768B

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.

This manual contains English. MM 313768

Graco Headquarters: Minneapolis

International Offices: Belgium, China, Japan, Korea

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440-1441

www.graco.com

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