307889K ULTRA 500 AIRLESS PAINT SPRAYER - Graco Inc.

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MOTOR IS HOT AND RUNS INTERMITTENTLY TYPE OF PROBLEM Motor is hot and runs intermittently. ELECTRICAL SHORT WHAT TO CHECK If check is OK, go to next check 1. Determine if sprayer was operated at high pressure with small tips, which causes low motor RPM and excessive heat build up. 2. Be sure ambient temperature where sprayer is located is no more than 32C (90F) and sprayer is not located in direct sun. 3. Determine if sprayer was turned on, pressurized, but not operating for long periods of time. WHAT TO DO When check is not OK refer to this column 1. Decrease pressure setting or increase tip size. 2. Move sprayer to shaded, cooler area if possible. 3 Turn off sprayer whenever you stop spraying for a while and relieve fluid pressure. TYPE OF PROBLEM Building circuit breaker opens as soon as sprayer switch is turned on. CAUTION Any short in any part of the motor power circuit will cause the control circuit to inhibit sprayer operation. Correctly diagnose and repair all shorts before checking and replacing control board. Building circuit breaker opens as soon as sprayer is plugged into outlet and sprayer is NOT turned on. Sprayer quits after sprayer operates for 5 to 10 minutes. WHAT TO CHECK If check is OK, go to next check 1. Check all electrical wiring for damaged insulation, and all terminals for loose fit or damage. Also check wires between pressure control and motor which are encased in conduit (1). See page 26. 2. Check for missing inspection plate gasket (see page 26), bent terminal forks or other metal to metal contact points which could cause a short. 3. Check motor armature for shorts. Use an armature tester (growler) or perform spin test. See page 16. Inspect windings for burns. 4. Check pressure control board (301) by substituting with a good control board. See page 22. WHAT TO DO When check is not OK refer to this column 1. Repair or replace any damaged wiring or terminals. Securely reconnect all wires. 2. Correct faulty conditions. 3. Replace motor. See page 26. 4. Replace with a new pressure control board (301). See page 22. 1. Check Basic Electrical Problems on page 12. 1. Perform necessary procedures. 2. Check ON/OFF switch (307) See page 21. Be sure the sprayer is unplugged! Disconnect wires from switch. Check switch with ohmmeter. The reading should be infinity with the ON/ OFF switch OFF, and zero with the switch ON. 3. Check for damaged or pinched wires in the pressure control. See page 22. 2. Replace ON/OFF switch. See page 21. 3. Replace damaged parts. See page 22. 1. Check Basic Electrical Problems on page 12. 1. Perform necessary procedures. 2. Check electrical supply with volt meter. Meter should read 200 to 250 VAC. 3. Check tightness of pump packing nut. Overtightening tightens packings on rod, restricts pump action, and damages packings. 2. If voltage is too high, do not operate sprayer until corrected. 3. Loosen packing nut. Check for leaking around throat. Replace pump packings, if necessary. See page 28. Spin Test WARNING ELECTRIC SHOCK HAZARD Do not touch the brushes, leads, springs or brush holders while the sprayer is plugged in to reduce the risk of electric shock and serious bodily injury. WARNING INJECTION HAZARD To reduce the risk of serious injury, follow the illustrated Pressure Relief Procedure warning on page 12 whenever you are instructed to relieve pressure.
For checking armature, motor winding and brush electrical continuity. Setup Relieve pressure. Remove the drive housing. See page 24. Remove the motor shield (1), the fan cover (F) and the inspection covers (J). See Fig. 9. Remove the pressure control/cover(301). Disconnect the – and + leads from the motor to the pressure control/ cover terminals M–, and M+. See Fig. 10. Armature Short Circuit Test Relieve pressure. Quickly turn the motor fan by hand. If there are no shorts, the motor will coast two or three revolutions before coming to a complete stop. If the motor does not spin freely, the armature is shorted and the motor must be replaced. See page 26. Armature, Brushes, and Motor Wiring Open Circuit Test (Continuity) Relieve pressure. Connect the two black motor leads together with a test lead. T urn the motor fan by hand at about two revolutions per second. If there is uneven or no turning resistance, check the following: broken brush springs, brush leads, motor leads; loose brush terminal screws, motor lead terminals; worn brushes. Repair parts as needed. See page 19. If there is still uneven or no turning resistance, replace the motor. See page 26. 1 F Fig. 9 J 301 M– – M+ + Fig. 10
Page 1 and 2: INSTRUCTIONS-PARTS LIST 307-889 Thi
Page 3 and 4: EQUIPMENT MISUSE HAZARD WARNING INS
Page 5 and 6: Major Components T M K C B A D E H
Page 7 and 8: Setup PRESSURE ADJUSTING KNOB ON/OF
Page 9 and 10: Startup Cleaning a Clogged Tip WARN
Page 11 and 12: Flushing NOTE: Several flushes are
Page 13 and 14: MOTOR WON’T OPERATE (Continued) T
Page 15: NO OUTPUT TYPE OF PROBLEM WHAT TO C
Page 19 and 20: Motor Brush Replacement NOTE: Repla
Page 21 and 22: On/Off Switch Replacement (Fig. 16)
Page 23 and 24: Pressure Control Replacement WARNIN
Page 25 and 26: Drive Housing, Connecting Rod, and
Page 27 and 28: Motor Replacement B1 DETAIL Shows p
Page 29 and 30: Displacement Pump Repair WARNING To
Page 31 and 32: Model 231-079, Series C 13 71 11
Page 33 and 34: Parts Drawing & List - Displacement
Page 35 and 36: Wiring Diagram WIRING DIAGRAM PRESS

307889K ULTRA 500 AIRLESS PAINT SPRAYER - Graco Inc.

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