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Graco SP Repair Manual

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REPAIR
SPt, SPXt
Airless Paint Sprayers
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
3000 psi (207 bar, 20.7 MPa) Maximum Working Pressure
120 Vac
826031, A
826032, A
Related manuals
Component Function and Identification
Grounding
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Troubleshooting
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General Repair Information
Spin Test
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Motor Brush Replacement
On/Off Switch Replacement
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
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Table of Contents
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ECOPYRIGHT 2003, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001
309665
309045; SP
309639; SPX
309716
3
Pressure Control Repair
5
Drive Housing Replacement
5
Motor Replacement
4
Displacement Pump Replacement
10
Technical Data
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10
12
Graco Phone Number
309711
826031
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309060; SP
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309053; SPX
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Rev. B
TI0051c
14
17
18
19
20
20

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  • Page 1 ......GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441 ECOPYRIGHT 2003, GRACO INC. Graco Inc. is registered to I.S. EN ISO 9001...
  • Page 2 WARNING ADVERTÊNCIA Poderá ocorrer incêndio e explosão quando for pulverizado ou injetado Fire and explosion hazard: Solvent and paint fumes can ignite or líquido inflamável numa área onde houver má circulação de ar; vapores explode. inflamáveis poderão incendiar-se a partir de uma chama ou fagulhas a To help prevent a fire and explosion: descoberto.

  • Page 3: Component Identification And Function

    Component Identification and Function TI0051 8050A Fig. 1 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 4: General Repair Information

    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.

  • Page 5: Troubleshooting

    Grounding WARNING Improper installation or alteration of grounding plug Grounded results in risk of electric shock, fire or explosion Outlets Grounding Plug that could cause serious injury or death. 1. Fig. 2. Both models require a 50/60 Hz, 15A circuit with a grounding receptacle.
  • Page 6 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 7 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 8 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 9 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.

  • Page 10: 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 4. 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 11 Motor Brush Replacement 6. Fig. 5. 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.
  • Page 12 On/Off Switch Replacement 120 Vac; 826031, 826032 Removal Installation 1. Install new ON/OFF switch (23). Install locking ring Relieve pressure; page 4. (24) and toggle boot (25). 2. Fig. 6 and 7. Remove four screws (18) and pres- sure control cover (39). 2.

  • Page 13: Wiring Diagram

    On/Off Switch Replacement 120 Vac Wiring Diagram ON/OFF Switch White 826031, A 826032, A Capacitor M– Black Power Green Plug Red (+) Pressure Black (–) Transducer from Motor Yellow ti2159a Potentiometer Fig. 7 309711...

  • Page 14: 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 15 Pressure Control Repair Motor Control Board Removal Installation Refer to Fig. 6 and 7. 1. Clean pad on rear of motor control board. Apply small amount of thermal compound 073019 to pad. 2. Fig. 6. Install motor control board (35) with five Relieve pressure;...
  • Page 16 Pressure Control Repair Pressure Control Transducer Pressure Adjust Potentiometer Removal Removal Refer to Fig. 6 and 7. Refer to Fig. 6 and 7. Relieve pressure; page 4. Relieve pressure; page 4. 2. Remove four screws (18) and cover (39). 2. Remove four screws (18) and cover (39). 3.

  • Page 17: 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 18: Motor Replacement

    Motor Replacement Disassembly 7. Remove three screws (22) behind board and remove control housing (21). 8. Remove four screws (22) and motor (1) from Relieve pressure; page 4. frame (63). 2. Remove pump (13); Displacement Pump Re- Assembly placement, page 19. 1.

  • Page 19: Displacement Pump Replacement

    1. Fig. 12. Extend pump piston rod fully. Apply grease to top of pump rod at (A) or inside connecting rod. TI0063 Fig. 13 7. Fig. 14. Fill packing nut with Graco TSL until fluid flows onto top of seal. TI0062 Fig. 12 2.

  • Page 20: Technical Data

    1–800–690–2894 to identify the nearest distributor. All written and visual data contained in this document reflect the latest product information available at the time of publication. Graco reserves the right to make changes at any time without notice. mm 309711...

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