Graco Inc 261820 General Problem Low or Fluctuating Output, Prime/Spray Valve Kit, Switch Kit

Page 21

Advanced Troubleshooting

General Problem: Low or Fluctuating Output

Specific Problem

Cause

Solution

 

 

 

 

 

 

Pump cycles, but output is low or

See Basic Troubleshooting,

 

surging.

page 11.

 

 

 

 

 

Worn or obstructed inlet and

Check for worn pump valves as follows:

 

outlet valves.

Prime sprayer with paint. Turn the Prime/Spray valve

 

 

 

 

to SPRAY position. Turn pressure control fully

 

 

clockwise.

 

 

Trigger spray gun briefly.

 

 

When spray gun trigger is released pump should

 

 

cycle momentarily and stop.

 

 

If pump continues to cycle, pump valves may be

 

 

worn or obstructed.

 

 

For replacement inlet and outlet valve kits, see List

 

 

of Kits, page 26.

 

 

 

 

Prime/Spray valve is leaking out

Check Prime/Spray valve for debris trapped on seat

 

drain line when Prime/Spray

and for worn parts. Torque to 130-180 in-lb

 

valve is in SPRAY position.

(15.8-18.1 N•m). Replace if parts are worn using

 

 

Prime/Spray Valve Kit, page 26.

 

 

 

 

Voltage from electrical outlet is

Check voltage of outlet. Meter must read 85 to 130V

 

too low. Low voltages reduce

AC.

 

sprayer performance.

 

 

 

 

 

Extension cord is too long or not

Replace extension cord.

 

heavy enough gauge.

See Grounding and Electrical Requirements,

 

 

 

 

page 6.

 

 

 

 

Leads from motor or pressure

Be sure terminals are centered and firmly

 

switch to control board are

connected. Inspect for pinched wiring and wiring

 

damaged, loose, pinched, or

insulation and terminals for signs of overheating.

 

overheated.

Replace any loose terminals or damaged wiring.

 

 

Securely reconnect terminals.

 

 

 

 

Motor brushes are worn.

Check length of BOTH brushes (brushes do not

 

 

wear evenly on both sides of the motor). Brush

 

 

length must be 0.25 in. (6.4mm). If brushes are worn

 

 

replace motor using Motor Kit, page 26.

 

 

 

 

Motor brush springs are broken.

If springs are broken, replace motor using Motor Kit,

 

 

page 26.

 

 

 

 

Motor brushes are binding in

Clean brush holders. Remove carbon dust with small

 

brush holders.

cleaning brush.

 

 

 

 

Motor stops before sprayer

Replace pressure control using Pressure Control

 

reaches correct pressure (stall

Switch Kit, page 26.

 

pressure is too low).

 

 

 

 

 

Control board is damaged.

See Control Board Diagnostics, page 25. If

 

CAUTION: Do not perform

damaged, replace control board using Control

 

Board Kit, page 26.

 

control board diagnostics until

 

 

you have determined the

 

 

armature is good. A damaged

 

 

armature can burn out a good

 

 

control board.

 

 

 

 

312667B

21

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Contents ProX9 Airless Sprayers 312667B US Patent 6,752,067 European Patent 1 208 Korean PatentRelated Manual Specifications Getting StartedFold-n-StoreCart ProX Sprayers Only Grounding Instructions Fire and Explosion Hazard Equipment Misuse Hazard Installation Grounding and Electric RequirementsThermal Overload ProX Sprayers Only Component IdentificationX7, ProX7, and ProX9 Only ProX9 OnlySG20 SG10 Operation Pressure Control Knob Settings Pressure Relief ProcedureTrigger Lock Trigger Locked SG10 Trigger Unlocked SG10General Repair Information Grounding and Electric Require Basic TroubleshootingProX7 and ProX9 Insert screw ProX7 and ProX9 Only Read Pump does not prime sectionRequirements, Grounding and ElectricalGrounding and Electrical General Problem Motor Does Not Operate Advanced TroubleshootingSee Control Board Diagnostics, Hazard After Thermal General Problem Circuit Breaker is Tripping General Problem Erratic Motor Operation Electric Requirements,Control. See List of Kits, Switch Kit, General Problem Low or Fluctuating OutputSee Control Board Diagnostics, page 25. If Prime/Spray Valve Kit,General Problem Excessive Pressure Build Up Control Switch Kit,Use Pressure Control Switch Kit, to replace Motor Diagnostics ProX7 and ProX9 Motor Diagnostics X5Setup Setup Relieve Pressure,ProX7, ProX9, X5, Pressure Control Switch DiagnosticsControl Board Diagnostics ProX7 and ProX9 Control Board Diagnostics X5Pump Diagnostics Kit Number Models Kit Description List of KitsX5 Model 262800 Parts List PartsPart Description Qty X5 Model X5, Model X7 Model 262805 Parts List X7 Model 41a 41b 41c 67a 47a 41d 67b 85a HUB CAP ProX7 and ProX9 Models 261815 and 261820 Parts ListProX7 and ProX9 Models 261815 ProX7 and ProX9 Models 261810 X5 and X7 Models 262800 Wiring DiagramsProX7 and ProX9 Models 261815 Magnum ProX7 Magnum ProX9 Technical DataFor Graco Canada Customers Graco Standard WarrantyGraco INC. P.O. BOX 1441 MINNEAPOLIS, MN