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2750 psi (195 bar) Maximum Working Pressure Model 231–547, Series A Complete sprayer with hose, gun, RAC IV DripLess Tip Guard and SwitchTip 02821A GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441 COPYRIGHT 1995, GRACO INC. Graco Inc. is registered to I.S. EN ISO 9001...
WARNING WARNING INJECTION HAZARD Spray from the gun, leaks or ruptured components can inject fluid into your body and cause ex- tremely serious injury, including the need for amputation. Fluid splashed in the eyes or on the skin can also cause serious injury. Fluid injected into the skin is a serious injury.
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This equipment is for professional use only. Read all instruction manuals, tags, and labels before operating the equipment. Use the equipment only for its intended purpose. If you are not sure, call Graco Technical Assis- tance at 1–800–543–0339. Do not alter or modify this equipment.
Component Identification and Function 02823A Fig. 1 Motor DC motor, 120 Vac, 15A, 1 phase Drive Assembly Transfers power from DC motor to the displacement pump Pressure Adjusting Knob Controls fluid outlet pressure ON/OFF Switch Power switch that controls 120 Vac power to sprayer Fluid Outlet Hose and spray gun is connected here Displacement Pump...
Setup 2. Fill the wet–cup (102). Pry off the wet-cup seal. WARNING Fill the cup 1/3 full with Graco Throat Seal Liquid (TSL), supplied. Install the wet-cup seal. If you supply your own hoses and spray gun, be sure the hoses are electrically conductive, that the 3.
Operation How to use the gun trigger safety Open or drain, position When engaged, the gun safety latch prevents the gun Closed, or spray position from accidental triggering. See Fig. 3. WARNING INJECTION HAZARD If the gun still sprays when the gun trig- ger safety is locked, repair the gun.
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Operation How to use the RAC IV tip guard. WARNING INJECTION HAZARD To reduce the risk of serious injury, Tip handle shown in whenever you are instructed to relieve spraying position. pressure, follow the Pressure Relief Turn handle 180 , Procedure on page 9.
Startup NOTE: Refer to Fig. 2 and the other figures referenced WARNING in the text as you start the sprayer. INJECTION HAZARD 1. Open the pressure drain valve (42). See Fig. 7. The system pressure must be manually relieved to prevent the system from 2.
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Startup b. If more coverage is needed, use a larger tip WARNING rather than increasing the pressure. FIRE AND EXPLOSION HAZARD To reduce the risk of static sparking and c. Adjust the direction of the spray pattern. See splashing when priming or flushing the Fig.
Shutdown and Care WARNING WARNING INJECTION HAZARD INJECTION HAZARD See the warning section INJECTION To reduce the risk of serious injury, HAZARD on page 3 for information on whenever you are instructed to relieve the hazard of using damaged hoses. pressure, follow the Pressure Relief Procedure on page 9.
Flushing When to Flush 3. Pour one-half gallon (2 liters) of compatible solvent into a grounded metal flushing pail. Put the suction 1. Before using a new sprayer: flush out the oil hose in the pail. which was left in to protect pump parts. 4.
Troubleshooting WARNING INJECTION HAZARD To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pressure Relief Procedure on page 9. Basic Problem Solving Check everything in the troubleshooting table before disassembling the sprayer. TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO If check is OK, go to next check...
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Basic Problem Solving TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO If check is OK, go to next check When check is not OK, refer to this column Electrical 5. Check motor armature commutator for burn 5. Remove motor and have motor shop (continued) spots, gouges and extreme roughness.
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Intermediate Problem Solving TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO If check is OK, go to next check When check is not OK, refer to this column Low output 3. Release gun trigger. Observe resting position of 3. If pump consistently comes to rest with (continued) pump rod (107).
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Intermediate Problem Solving TYPE OF PROBLEM WHAT TO CHECK WHAT TO DO When check is not OK, refer to this column If check is OK, go to next check 1. Spray tip worn beyond sprayer pressure capa- 1. Replace spray tip. Spray Pattern Variations bility.
Motor Test WARNING INJECTION HAZARD To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pressure Relief Procedure on page 9. For checking armature, motor winding and brush electrical continuity. Setup Remove the drive housing. See page 27. This is to ensure that any resistance you notice in the armature test is due to the motor and not to worn gears in the drive housing.
General Repair Information WARNING WARNING INJECTION HAZARD HOT SURFACE HAZARD During operation, the motor and drive To reduce the risk of serious injury, housing become very hot and could burn whenever you are instructed to relieve your skin if touched. Flammable materi- pressure, follow the Pressure Relief als spilled on the hot, bare motor could cause a fire Procedure on page 9.
Motor Brushes NOTE: Replace brushes when worn to about 0.5 in. Motor lead; do not disconnect (12.5 mm). Always check both brushes. Brush Repair Minimum 0.5” (12.5 mm) Kit 236–967, which includes spring clip 112–766, is available for motors manufactured by Pacific Scientific. Included in Brush Repair Kit 236–967 NOTE: Replacement brushes may last only half as...
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Motor Brushes 9. Test the brushes. WARNING a. Remove the pump connecting rod pin (17). MOVING PARTS HAZARD See Fig. 17, page 21. Do not touch the brushes, leads, springs or brush holders while the sprayer is b. With the sprayer OFF, turn the pressure con- plugged in to reduce the risk of electric trol knob fully counterclockwise to minimum shock and serious injury.
Fill the packing nut/wet-cup marked with an asterisk, i.e., (121*). For the best 1/3 full with Graco TSL. Push the plug (123) into results, use all the new parts in the kit, even if the old the wet-cup.
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Displacement Pump Repair Intake valve repair 2. Stack these parts onto the piston valve (108) one (See Fig. 16) at a time: the backup washer (126*) and u-cup 1. Remove the suction hose. See Step 3, Removing (125*), the female gland (114*), alternately three the pump.
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Displacement Pump Repair 3. Tighten the nut (110) onto the piston valve (108) to 6. Hand tighten the valve into the piston rod just until 2 in-lb (0.23 N.m). See Fig. 19. the nut (110) contacts the rod. See Fig. 20. 7.
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Displacement Pump Repair 11. Place a new o-ring (116*) firmly in the cylinder 15. Torque the cylinder jam nut (117) to 73 ft-lb groove. See Fig. 21. (98 N.m). See Fig. 21. 16. Install the pump. See page 21. 12. Coat the piston rod and packings with oil. Carefully slide the assembly into the top of the cylinder (115).
Motor 9. Align the new motor with the base and reinstall the WARNING screws (46). INJECTION HAZARD 10. Assemble the drive housing to the motor. Follow To reduce the risk of serious injury, steps 8 to 10 on page 27. whenever you are instructed to relieve 11.
Motor Start Board 5. Install the new cord (50) in the reverse order of disassembly. 6. Install the junction box. Be sure no leads are WARNING pinched against the motor or by the motor start board. Also be sure the gasket (89) is installed. INJECTION HAZARD To reduce the risk of serious injury, On/Off Switch...
Drive Housing, Connecting Rod, Crankshaft WARNING CAUTION INJECTION HAZARD Do not allow the gear (16) to fall; it may stay attached to the drive housing or to the motor. To reduce the risk of serious injury, whenever you are instructed to relieve Do not lose the thrust balls (11a or 4a) or let them pressure, follow the Pressure Relief fall between the gears, which will damage the drive...
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Drive Housing, Connecting Rod, Crankshaft REF A Torque to 80 in–lb (9 N.m) Quantity of three Quantity of one Apply a total of 3 fl. oz. (29 cc) of grease to gears. Note: Filter not shown 02815 Fig. 28...
Pressure Control 7. Loosely install the screws (63) and then torque WARNING them to 21 in–lb (2.4 N.m). INJECTION HAZARD 8. Install the front cover (13). Connect the harness To reduce the risk of serious injury, (A) to the motor start board (47). whenever you are instructed to relieve pressure, follow the Pressure Relief 9.
Pressure Transducer WARNING INJECTION HAZARD To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pressure Relief Procedure on page 9. NOTE: See Fig. 30 for this procedure. 1. Remove the displacement pump. See page 21. 2.
Suction Hose WARNING CAUTION INJECTION HAZARD Misalignment or cross-threading will damage the parts and/or create shavings which can cause the To reduce the risk of serious injury, o–ring (27) to leak. whenever you are instructed to relieve pressure, follow the Pressure Relief Procedure on page 9.
Drain Valve Repair WARNING 1. Unscrew the spring retainer from the valve body. INJECTION HAZARD Remove the spring, washers and stem/ball. Clean any debris from the ball or seat area. To reduce the risk of serious injury, whenever you are instructed to relieve 2.
Displacement Pump Parts Drawing and List Model 235–699, Series A Includes items 101 to 127 No. Part No. Description 101 187–611 MANIFOLD, pump 102 176–758 PACKING NUT 103* 103 176–757* GLAND, female, throat 104 176–997* V–PACKING, plastic, throat 105 176–755* V–PACKING, leather, throat 106 176–754*...
Sprayer Parts List Model 231–547, Series A Includes items 3 to 89 as listed below Ref. Ref. Part No. Description Qty. Part No. Description Qty. 111–700 GRIP, handle 224–807 BASE, valve 238–344 MOTOR KIT 111–600 PIN, grooved, 3/32 x 1” Includes items 4a to 4f 187–625 HANDLE, drain valve...
This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for verification of the claim. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The equipment will be returned to the origi- nal purchaser transportation prepaid.
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3X8–634 Rev. C Supersedes Rev. A and PCN B Parts Change Notice Some parts in Rev. A of manual 308–634 have changed but have not yet been changed in the instruction manual. Please note the changes below and mark them in your manual or keep this sheet with your manual.
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Other Changes Add the following data to the Technical Data section of your instruction manual. Sound Data* *Sound Level ......80.1 dB(A) *Sound Power .