Graco Inc 795 Premium Hi-Boy, 695 Premium Hi-Boy, 3A0157A Follow Pressure Relief Procedure on

Page 11

Troubleshooting

 

 

WHAT TO CHECK

 

WHAT TO DO

TYPE OF PROBLEM

If check is OK, go to next check

When check is not OK, refer to this column

 

 

 

 

 

Pump output is low

1.

Spray tip worn

1.

Follow Pressure Relief Procedure on

 

 

 

 

page 8, then replace tip. See your sepa-

 

 

 

 

rate gun or tip manual.

 

 

 

 

 

 

2.

Spray tip clogged

2.

Relieve pressure. Check and clean spray

 

 

 

 

tip.

 

 

 

 

 

 

3.

Paint supply

3.

Refill and reprime pump.

 

 

 

 

 

 

4.

Intake strainer clogged

4.

Remove and clean, then reinstall

 

 

 

 

 

 

5.

Intake valve ball and piston ball

5.

Remove intake valve and clean. Check

 

 

are not seating properly

 

balls and seats for nicks; replace if neces-

 

 

 

 

sary; see pump manual 310643 or

 

 

 

 

310894. Strain paint before using to

 

 

 

 

remove particles that could clog pump.

 

 

 

 

 

 

6.

Suction hose connections

6.

Tighten any loose connections. Check for

 

 

 

 

missing or damaged seals.

 

 

 

 

 

 

7.

Fluid filter, tip filter, or tip is

7.

Clean filter; see operation manual.

 

 

clogged or dirty.

 

 

 

 

 

 

 

8.

Prime valve leaking

8. Relieve pressure. Repair prime valve.

 

 

 

 

 

 

9.

Verify pump does not continue to

9.

Service pump; see pump manual 310643

 

 

stroke when gun trigger is

 

or 310894.

 

 

released. (Prime valve not leak-

 

 

 

 

ing.)

 

 

 

 

 

 

 

 

10.

Leaking around throat packing

10.

Replace packings; see pump manual. Also

 

 

nut which may indicate worn or

 

check piston valve seat for hardened paint

 

 

damaged packings.

 

or nicks and replace if necessary. Tighten

 

 

 

 

packing nut/wet-cup.

 

 

 

 

 

 

11.

Pump rod damage

11.

Repair pump. See pump manual 310643

 

 

 

 

or 310894.

 

 

 

 

 

 

12.

Low stall pressure

12.

Turn pressure knob fully clockwise. Make

 

 

 

 

sure pressure control knob is properly

 

 

 

 

installed to allow full clockwise position. If

 

 

 

 

problem persists, replace pressure trans-

 

 

 

 

ducer.

 

 

 

 

 

 

13.

Piston packings are worn or

13.

Replace packings; see pump manual

 

 

damaged

 

310643 or 310894.

 

 

 

 

 

 

14.

O-ring in pump is worn or dam-

14.

Replace o-ring; see pump manual 310643

 

 

aged

 

or 310894.

 

 

 

 

 

 

15.

Intake valve ball is packed with

15.

Clean intake valve; see pump manual

 

 

material

 

310643 or 310894.

 

 

 

 

 

 

16.

Pressure setting is too low

16.

Increase pressure; see pump manual

 

 

 

 

310643 or 310894.

 

 

 

 

 

 

17.

Large pressure drop in hose with

17.

Use larger diameter hose and/or reduce

 

 

heavy materials

 

overall length of hose. Use of more than

 

 

 

 

100 ft of 1/4 in. hose significantly reduces

 

 

 

 

performance of sprayer. Use 3/8 in. hose

 

 

 

 

for optimum performance (50 ft minimum).

 

 

 

 

 

3A0157A

11

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Contents Mark Electric Airless SprayersUltra MAX lIl ModelsTable of Contents Grounding Grounding InstructionsSkin Injection Hazard Fire and Explosion HazardMoving Parts Hazard Equipment Misuse HazardElectric Shock Hazard Pressurized Aluminum Parts HazardComponent Identification Pressure Relief Procedure Extension Cord Power RequirementsGrounding PailsMechanical/Fluid Flow TroubleshootingWhat to Check What to do Type of Problem Follow Pressure Relief Procedure on What to Check What to do Type of Problem Electrical Type of Problem What to Check HOW to CheckCheck to see if transducer and control board Step Check Motor Thermal Switch Unplug thermal Is not correct, replace motor YES Sprayer Will Not Shut OffSprayer Will Not Run Step VAC and 110 VAC Motor Control Board Removal Installation33 D 115 Removal VAC Filter BoardPressure Adjust Potentiometer Pressure Control Transducer Install control box 61 and control panel 68 with four screws 3A0157A Assembly Drive and Bearing Housing ReplacementDisassembly Drive and Bearing Housing Replacement Removal Motor ReplacementInstallation Motor Replacement Perform Relieve Pressure Procedure Displacement Pump Replacement for 695/795/MarkTi7169a Perform Pressure Relief Procedure, Displacement Pump Replacement 1095/1595/MarkPlace u-bolt on pump door protrusion Attach drain hose to sprayer Hose Reel Grease shaft Install swivel Removal Installation Reed Switch Replacement120V Models Wiring Diagram120V Models with 15/20 Amp Switch 240V Models 3A0157A For Graco Canada Customers Graco Standard Warranty