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REPAIR
KEEP FOR REFERENCE.
Read this and all related manuals for
important warnings and instructions.
INSTRUCTIONS
STtSTXt
Airless Paint Sprayers
3000 psi (207 bar, 20.7 MPa ) Maximum Working Pressure
120 Vac
234127, A, B
234126, A, B
110 Vac UK
234187, A, B
220–240 Vac
234175, A, B
234177, A, B
234179, A, B
246993, A, B
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
Table of Contents
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ECOPYRIGHT 2002, GRACO INC.
Graco Inc. is registered to I.S. EN ISO 9001
First choice when
quality counts.t
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309665
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309045; ST North America
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309097; ST Europe
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309639; STX
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309715; North America
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309718; Europe
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309719; Asia
3
Pressure Control Repair
5
Drive Housing Replacement
5
Motor Replacement
4
Displacement Pump Replacement
10
Technical Data
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10
Graco Phone Number
12
Graco Warranty
309710
ti5875a
234127
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309060; ST
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309053; STX
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Rev. C
16
19
20
21
22
22
22
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Summary of Contents for Graco ST
- Page 1 ....... GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441 ECOPYRIGHT 2002, GRACO INC. Graco Inc. is registered to I.S. EN ISO 9001...
- Page 2 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.
- Page 3 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 4 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 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 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 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. 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.
- Page 12 On/Off Switch Replacement 120 Vac; 234127, 234126 Removal Installation 1. Install new ON/OFF switch (23). Install locking ring Relieve pressure; page 4. (24) and toggle boot (25). 2. Fig. 5 and 6. Remove four screws (18) and pres- sure control cover (39). 2.
- Page 13 On/Off Switch Replacement 120 Vac Wiring Diagram ON/OFF Switch (Capacitor on PC board) White 234127, A, B 234126, A, B Capacitor M– Black Power Green Plug Red (+) Pressure Black (–) Transducer from Motor Yellow ti2159a Potentiometer Fig. 6 309710...
- Page 14 On/Off Switch Replacement 110 Vac UK 234187 Removal Installation 1. Install new ON/OFF switch (23). Install locking ring (24) and toggle boot (25). Relieve pressure; page 4. 2. Connect four wires (A) to ON/OFF switch (23). 2. Fig. 7. Remove four screws (18) and pressure 3.
- Page 15 On/Off Switch Replacement 240 Vac 234175, 234177, 234179, 246993 Removal Installation 1. Install new ON/OFF switch (23). Install locking ring Relieve pressure; page 4. (24) and toggle boot (25). 2. Fig. 8. Remove pressure control cover (39). 2. Connect four wires (A) to ON/OFF switch. 3.
- Page 16 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 17 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 18 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 4. Relieve pressure;...
- Page 19 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 20 Motor Replacement Disassembly 7. Remove three screws (22) behind board and remove control housing (21). Relieve pressure; page 4. 8. Remove four screws (22) and motor (1) from frame (63). 2. Remove pump (13); Displacement Pump Re- Assembly placement, page 21. 1.
- Page 21 (A) or inside connecting rod. ti5916a TI0063 Fig. 13 ti5916a 7. Fig. 14. Fill packing nut with Graco TSL until fluid flows onto top of seal. TI0062 Fig. 12 2. Fig. 10. Install pump pin (9a). Verify retainer spring ti5916a Fig.
- Page 22 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. Sales Office: Minneapolis International Offices: Belgium, Korea, Hong Kong, Japan www.graco.com...
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