Graco 257528 Manuale utente

- For servicing FinishPro 290 and FinishPro II 295 sprayers -

2600 psi Models: 257528

2800 psi Models: 257529

3000 psi Models: 24U996

Pressure Relief Procedure

Important Safety Instructions

For detailed instructions and warnings,

see sprayer manual.

Toreducetheriskofinjuryfrominjection,alwaysfollow

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.

313899B

Repair Kit

Pressure Control

Replacement Kit

ti9346a

2 313899B

Removal

1. Relieve Pressure (see cover) and unplug power

cord.

2. Remove pail hook (G) from bottom of front cover

(C).

3. Removesuctiontubeassembly(W)anddraintube

(U).

4. Remove four cover screws (B) and front cover (C).

5. Remove yoke (D) and guide rods (E). Clean if nec-

essary.

6. Disconnectpressurecontrolharness(F)fromcon-

trolboardconnector(H)atbackofdrivehousing(J).

Using fingernail or tip of small, flat-blade screw-

driver, press tab on right side of connector to

release.

7. Remove pump (M) from drive housing (J).

8. Place pump (M) on workbench or in vise.

9. Unscrewpressurecontrolswitch(P)frompump(M).

Verify that o-ring seal (R) is also removed from

pump (M).

Installation

• Read all Installation Notes on back of this page.

1. Screw new pressure control switch (P) into pump

(M), and torque to 140-160 in-lb (16-18 N•m). Do

not overtighten, damage could occur.

2. Routepressure controlharnessthrough retention

clip(K),andconnecttocontrolboardconnector(H)

at back of drive housing (J) as shown in Wiring

Detail.

3. Install pump (M) on mounting pins (S). Make sure

plastic washers (T) are between drive housing (J)

and pump and that pressure control wires are not

pinched between pump and drive housing.

4. Installyoke(D)withrodcapinslotofyokeasshown

in Rod Yoke Detail on next page.

5. Checkfinal assembly against DriveTrain Detail on

next page.

6. Install front cover (C) and cover screws (B).

7. Install pail hook (G) to bottom of front cover (C).

8. Installsuctiontubeassembly(W)anddraintube(U)

on new pump (M).

9. TurnPressureControlKnob(P)clockwiseasfaras

itwillgo.Applypressurecontrollabeltoknob.Posi-

tion as shown below.

ti14315a

313899B 3

Installation Notes

To prevent misalignment, assemble sprayer tipped onto back of enclosure.

 

ti13842a

Rod/Yoke Detail







Pump

ear

Yoke

Replacement

Kit

Replacement Kit



Drive Train Detail Wiring Detail

Pressure Control Switch

Replacement Kit

257528 (2600 psi Models)

257529 (2800 psi Models)



24U996 (3000 psi Models)











Take care to not pinch harness (F) between pump (M) and any part of drive housing (J) or between front cover

For best cover (C) alignment, tighten lower two cover screws (B) first, then top two. Torque screws to 70 to 80 in-lb

(8 to 9 N•m).

For yolk (D) installation, eccentric bearing (Y) on gear (X) must touch top of pump rod. Turn gear to move eccentric

bearing to proper height.

Ifyokeguiderods(E)dropoutofpositionduringassembly,damagewilloccurwhencoveristightened.Alwayscheck

position of guide rods before tightening cover.

Apply light coat of oil.

Apply one or two drops of thread locking adhesive (included in kit) to threads of pressure control switch (P).

Torque to 140-160 in.-lb (16-18 N•m).



4 313899B

For the latest information about Graco products, visit www.graco.com.

TO PLACE AN ORDER, contact your Graco distributor or call 1-800-690-2894 to identify the nearest distributor.

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.

)RUSDWHQWLQIRUPDWLRQVHHZZZJUDFRFRPSDWHQWV

2ULJLQDOLQVWUXFWLRQV This manual contains English. MM 313899

Graco Headquarters: Minneapolis

International Offices: Belgium, China, Japan, Korea

GRACO INC. AND SUBSIDIARIES • P.O. BOX 1441 • MINNEAPOLIS MN 55440-1441 • USA

www.graco.com

Revised February 2014

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