Graco Inc 307-712, PRO 5000, 218-745 manual Piston Removal and Repair

Page 24

SERVICE

Piston￿ Removal￿ and￿ Repair

8. Install￿ the￿ new￿ packing￿ (27)￿ and￿ guide￿ (26)￿ in￿ the

1.

To￿ disconnect￿ the￿ fluid￿ hose￿ (31)￿ from￿ the￿ covergun￿ body￿ (1);￿ screw￿ the￿ guide￿ in￿ loosely.

 

plate￿ (41),￿ screw￿ the￿ nut￿ (34)￿ off￿ the￿ adapter￿ (35).

DO￿ NOT￿ fully￿ tighten￿ the￿ guide￿ (26)￿ yet.￿ The

 

See￿ Fig￿21.

NOTE:

 

 

guide￿ must￿ be￿ loose￿ to￿ avoid￿ damaging￿ the

 

 

 

2.

Note￿ the￿ position￿ of￿ the￿ trigger￿ adjusting￿ nut￿ (24)￿ for

packing￿ (27)￿ when￿ pushing￿ the￿ piston￿ shaft

through￿ the￿ guide.

 

reinstallation,￿ then￿ screw￿ it￿ off￿ the￿ piston￿ ￿ shaft.

 

 

 

 

 

 

9. If￿ replacing￿ the￿ u￿cup￿ packing￿￿(37),slide￿ it￿ onto￿ the

3.

Remove￿ the￿ screws￿ (61)￿ and￿ lock￿ washers￿ (82)￿ frompiston￿ (42)￿ so￿ the￿ lips￿ of￿ the￿ packing￿ will￿ face￿ to;

 

the￿ cover￿ plate￿ (41).￿ Remove￿ the￿ cover￿ plate￿ (41),wards￿ the￿ front￿ of￿ the￿ gun￿ when￿ the￿ piston￿ is￿ in;

 

spring￿ (38),￿ and￿ retainer￿ cap￿ (74).

stalled.￿ Then￿ install￿ the￿ buna;n￿ o;ring￿ (30)￿ and

 

 

4.

Unscrew￿ and￿ remove￿ the￿ air￿ valve￿ guide￿ (26)￿ andVitonr￿ o;ring￿ (79)￿ on￿ the￿ piston.

 

needle￿ packing￿ (27)￿ from￿ the￿ gun￿ body￿ (1),

10. Install￿ the￿ piston￿ assembly￿ into￿ the￿ gun￿ body￿ (1),

 

 

5.

 

being￿ careful￿ not￿ to￿ damage￿ the￿ piston's￿ lip￿ seal.

Push￿ on￿ the￿ end￿ of￿ the￿ piston￿ shaft,￿ and￿ remove￿ the

 

piston￿ assembly.

11. Install￿ the￿ retainer￿ cap￿ (74)￿ into￿ the￿ cover￿ plate￿ (41).

 

NOTE: DO￿ NOT￿ remove￿ the￿ u;cup￿ packing￿ (37)￿ from

12. Install￿ the￿ cover￿ plate￿ (41),￿ spring￿ (38),￿ and￿ retainer

the￿ piston￿ shaft￿ except￿ to￿ replace￿ it￿ as￿ removalcap￿ (74)￿ with￿ the￿ screws￿ (61)￿ and￿ lock￿ washers￿ (82). will￿ damage￿ this￿ packing.

13. Actuate￿ the￿ trigger￿ and￿ tighten￿ the￿ air￿ valve￿ guide

6. Clean￿ and￿ inspect￿ parts￿ for￿ wear￿ or￿ damage.￿ Re;(26)￿ with￿ a￿ wrench. place￿ parts￿ as￿ needed.

7. When￿ reassembling￿ the￿ piston￿ assembly,￿ lubricate14. Screw￿ the￿ trigger￿ adjusting￿ nut￿ (24)￿ onto￿ the￿ piston shaft￿ to￿ its￿ previously￿ noted￿ position.

the￿ o;rings￿ (30￿ &￿ 79)￿ and￿ the￿ u;cup￿ packing￿ (42)￿ on

the￿ piston￿ with￿ petroleum￿ jelly.￿ Pack￿ the￿ spring￿ (38)

15. Connect￿ the￿ fluid￿ hose￿ (31)￿ to￿ the￿ adapter￿ (35).

with￿ petroleum￿ jelly.￿ Apply￿ Teflon￿ tape￿ to￿ the￿ air￿ valve guide￿ (26).

KEY

1

Gun￿ Body

34

Nut

42

Piston

 

24

Trigger￿ Adjusting￿ Nut

35

Adapter

61

Screws

 

26

Air￿ Valve￿ Guide

37

U;Cup￿ Packing

74

Retainer￿ Cap

 

27￿

Needle￿ Packing

38

Spring

79

Viton￿ O;Ring

42

30

Buna;n￿ O;Ring

41

Cover￿ Plate

82

Lock￿ Washers

 

31Fluid￿ Tube

37

7974

141

3538

Pack￿ with lubricant

30

Apply

 

Teflon

 

tape

61

26

24

82

27

3134

Fig￿ 21

24 307-712

Image 24
Contents Automatic MID-RANGE Electrostatic Rev PPart Number 218±745, Series B This manual contains Important  Table of Contents TermsHose Safety Equipment Misuse HazardHazardous Fluid Hazard Flushing and Cleaning Safety Ventilate the Spray BoothFire or Explosion Hazard HOW the Electrostatic AIR Spray GUN WorksTypical Installation Ventilate the Spray BoothNON±HAZARDOUS Area KEY Hazardous AreaInstallation Mount the GunInstalling Optional Remote Fan Air Adapter Check the Electrical GroundingOperating Checklist OperationFilter the Fluid Spraying OperationAdjust the Spray Pattern AccessoriesMaintenance Daily Care and CleaningFlush the Spray Gun GUN in SolventTo Clean or Change Air Cap and Fluid Nozzle Equipment neededSpray Pattern Troubleshooting Chart Problem Cause Solution Improper Spray PatternGUN Operation Troubleshooting Chart Problem Cause SolutionElectrical Troubleshooting Chart See Check the Electrical GroundingTest Power Supply Resistance Electrical TestsTest Gun Resistance Test Resistor Stud Resistance Service Gun DisassemblyGun Assembly Note Electrode ReplacementResistor Stud Replacement To install the resistor studFluid Needle Packing Replacement Barrel Removal66b Service Power Cartridge Replacement Turbine Alternator RemovalFan Air Valve Replacement Piston Removal and Repair Disc Regulator ORing Replacement Ref No Power Cartridge Ref No 66, Tool KitDetail a Parts List Old/New Style Resistor Stud and ElectrodeKits Description QtyTechnical Data Service InformationHOW to Order Replacement Parts Assembly Changed Status No. Part No NameAccessories High Volume AIR Regulator 206±199Grounded AIR Supply Hose AIR Hose Adapter 185±493Remote Switch & Signal Light 728±386 Control Panel 218±394 Filter AIR or Paint 202±271Electrostatic System 231±035 Electrostatic System 231±036Graco Warranty and Disclaimers WarrantyImportant Phone Numbers To you 1±800±328±0211 Toll Free