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REPAIR
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
- For portable spray applications of architectural paints and coatings -
190ESt
Airless Paint Sprayers
3000 psi (207 bar, 20.7 MPa ) Maximum Working Pressure
120 VAC
232900, A, B, C, D, E
232901, A, B, C, D
233797, A, B, C, D
233815, A, B, C, D
100-120 VAC
232903, A, B
220-240 VAC
232906, A, B
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General Repair Information
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Table of Contents
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First choice when
quality counts.t
ti5875a
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309059
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309061
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309065
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Graco Phone Number
14
Graco Warranty
309063E
232900
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309064
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309060
308644
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Table of Contents
Related Manuals for Graco 232903A
Summary of Contents for Graco 232903A
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Page 1: Table Of Contents
..... Graco Phone Number ...... - Page 2 Specifications This equipment is not intended for use with flammable or combustible materials used in places such as cabinet shops or other “factory” or fixed locations. If you intend to use this equipment in this type of application, you must comply with NFPA 33 and OSHA requirements for the use of flammable and combustible materials.
- Page 3 The following are general Warnings related to the safe setup, use, maintenance and repair of this equipment. Additional, more specific warnings may be found throughout the text of this manual where applicable. WARNING FIRE AND EXPLOSION HAZARD Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent fire and explosion: D Use equipment only in well ventilated area.
- Page 4 D Check equipment daily. Repair or replace worn or damaged parts immediately. D Do not alter or modify equipment. D Use equipment only for its intended purpose. Call your Graco distributor for information. D Route hoses and cables away from traffic areas, sharp edges, moving parts and hot surfaces.
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Page 5: Component Function And Identification
Component Identification and Function ti5914a Motor DC motor, permanent magnet, fan cooled Drive Assembly Transfers power from DC motor to displacement pump Displacement Pump Transfers fluid to be sprayed from source through spray gun Fluid Outlet Spray gun is connected here Prime Valve Used to prime and drain sprayer (also relieves fluid outlet pressure) when open... - Page 6 General Repair Information Pressure Relief Procedure 1. Keep all screws, nuts, washers, gaskets, and electrical fittings removed during repair proce- dures. These parts are not normally provided with WARNING replacement assemblies. INJECTION HAZARD WARNING System pressure must be manually relieved to prevent system from starting ELECTRIC SHOCK HAZARD or spraying accidentally.
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Page 7: Grounding
Grounding WARNING Grounded Grounding Plug Outlets Improper installation or alteration of grounding plug results in risk of electric shock, fire or explosion that could cause serious injury or death. 1. 220–240 Vac models require a 50 Hz, 10A circuit with a grounding receptacle. 100–120 Vac models 240 Vac model shown require a 50/60 Hz, 15A circuit with a grounding Fig. - Page 8 Troubleshooting MOTOR WON’T OPERATE (Continued) 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 Basic Electrical Problems 5. That motor leads are securely fastened and 5.
- Page 9 Troubleshooting LOW OR FLUCTUATING OUTPUT 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 Low Output 1. For worn spray tip. 1. Follow Pressure Relief Procedure Warn- ing, then replace tip.
- Page 10 Troubleshooting LOW OR FLUCTUATING OUTPUT 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 Motor runs and pump strokes 1. Paint supply. 1. Refill and reprime pump. 2.
- Page 11 Troubleshooting MOTOR IS HOT AND RUNS INTERMITTENTLY 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 Motor is hot and runs intermit- 1. Determine if sprayer was operated at high 1.
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Page 12: Spin Test
Spin Test Setup Armature, Brushes, and Motor Wiring Open Circuit Test (Continuity) 1. Connect red and black motor leads together with Electric Shock Hazard; page 6. test lead. Turn motor fan by hand at about two revolutions per second. 2. If uneven or no resistance, check for: broken brush To check armature, motor winding and brush electrical springs, brush leads, motor leads;... - Page 13 Motor Brush Replacement 6. Fig. 4. Insert brush (B). Push clip (A) until it snaps 8. Inspect commutator for excessive pitting, burning into place and secures brush. or gouging. A black color on commutator is normal. Have commutator resurfaced by a motor repair shop if brushes wear too fast.
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Page 14: On/Off Switch Replacement
On/Off Switch Replacement 120 Vac Removal Installation 1. Install new ON/OFF switch (23). Install locking ring Relieve pressure; page 6. (24) and toggle boot (25). 2. Fig. 5 and 6. Remove four screws (18) and pres- sure control cover (39). 2. - Page 15 On/Off Switch Replacement 120 Vac Wiring Diagram (Capacitor on Motor) ON/OFF 232900, A, B Switch L2 L1 232901, A 233797, A 233815, A Power Plug Black Pressure Transducer White Green Yellow from Motor Potentiometer Red (+) Black (–) Capacitor TI0060 Wiring Diagram ON/OFF Switch...
- Page 16 On/Off Switch Replacement 100 Vac (232903) Removal Installation 1. Install new ON/OFF switch (23). Install locking ring (24) and toggle boot (25). Relieve pressure; page 6. 2. Connect four wires (A) to ON/OFF switch (23). 2. Fig. 7. Remove four screws (18) and pressure 3.
- Page 17 On/Off Switch Replacement 240 Vac (232906) Removal Installation 1. Install new ON/OFF switch (23). Install locking ring Relieve pressure; page 6. (24) and toggle boot (25). 2. Fig. 8. Remove pressure control cover (39). 2. Connect four wires (A) to ON/OFF switch. 3.
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Page 18: Pressure Control Repair
Pressure Control Repair Motor Control Board Diagnostics Note: Keep a new transducer on hand to use for test. 1. Remove four screws (18) and cover (39). 2. Turn ON/OFF switch ON. CAUTION 3. Observe LED operation and reference following table: Do not allow sprayer to develop fluid pressure with- out transducer installed. - Page 19 Pressure Control Repair Motor Control Board Removal Installation 1. Clean pad on rear of motor control board. Apply Refer to Fig. 5 and 6, 7 or 8 depending on sprayer small amount of thermal compound 073019 to pad. voltage. 2. Fig. 5. Install motor control board (35) with five screws (36).
- Page 20 Pressure Control Repair Pressure Control Transducer Pressure Adjust Potentiometer Removal Removal Refer to Fig. 5 and 6, 7 or 8 depending on sprayer Refer to Fig. 5 and 6, 7 or 8 depending on sprayer voltage. voltage. Relieve pressure; page 6. Relieve pressure;...
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Page 21: Drive Housing Replacement
Drive Housing Replacement 5. Remove two back screws (22). CAUTION 6. Pull drive housing (10) off of motor (1). Do not drop gear cluster (7) when removing drive housing (10). Gear cluster may stay engaged in Assembly motor front end bell or drive housing. 1. -
Page 22: Motor Replacement
Motor Replacement Disassembly 7. Remove three screws (22) behind board and remove control housing (21). Relieve pressure; page 6. 8. Remove four screws (22) and motor (1) from frame (63). 2. Remove pump (13); Displacement Pump Re- Assembly placement, page 23. 1. -
Page 23: Displacement Pump Replacement
1. Fig. 13. Extend pump piston rod fully. Apply grease to top of pump rod at (A) or inside connecting rod. ti5916a Fig. 14 ti5916a 7. Fig. 15. Fill packing nut with Graco TSL until fluid flows onto top of seal. TI0062 Fig. 13 Fig. 15 ti5916a 2. -
Page 24: Technical Data
1–888–541–9788 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. MM 309063...