Graco 390sts - Manuals

06197 Major Components C Fig. 1 G E F D A K M B H N J L 05963 A Motor DC motor, 120 Vac, 15A, 1 phase B Drive Assembly Transfers power from DC motor to the displacement pump C Pressure Adjusting Knob Controls fluid outlet pressure D ON/OFF Switch Power switch that controls 120 Vac power to sprayer E...

6 308-548 Setup WARNING If you supply your own hoses and spray gun, be sure the hoses are electrically conductive, that the gun has a tip guard, and that each part is rated for at least 2750 psi (195 bar) Working Pressure. This is to reduce the risk of serious injury caused by static sparking, fluid...

308-548 7 Operation How to Use the Gun Trigger Safety WARNING INJECTION HAZARD If the gun still sprays when the gun trig- ger safety is locked, repair the gun. See manual 308–645, supplied. 1. To engage the gun trigger safety, turn the latch counterclockwise toward the handle until the detent of the...

Operation How to use the RAC IV tip guard. 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. The tip guard alerts you to the risk and helps prevent placing any part of the body close to the ...

308-548 9 Startup INJECTION HAZARD The system pressure must be manually relieved to prevent the system from starting or spraying accidentally. Fluid under high pressure can be injected through the skin and cause serious injury. To reduce the risk of an injury from injection, splashing fluid, or movi...

12 308-548 Shutdown and Care 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. Shutdown and Care 1. Check the packing nut/wet-cup daily (102). Re- lieve pressure first. Keep the wet-cup 1/3 ...

308-548 13 Flushing When to Flush 1. Before using a new sprayer: flush out the oil which was left in to protect pump parts. Before using water-base paint: flush with min- eral spirits followed by soapy water, and then a clean water flush. Before using oil-base paint: flush with mineral spirits only....

14 308-548 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 PRO...

Intermediate Problem Solving TYPE OF PROBLEM WHAT TO CHECK If check is OK, go to next check WHAT TO DO When check is not OK, refer to this column Low output (continued) 3. Release gun trigger. Observe resting position of pump rod (107). 3. If pump consistently comes to rest with rod (107) fully exte...

18 308-548 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 elec- trical continuity. Setup Remove the drive housing. See page 28. T...

General Repair Information 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. Tool List These are the tools required to service all parts of the sprayer. 3/16” Allen wrench: gear housing, leg...

Motor Brushes NOTE: Replace brushes when worn to about 0.5 in. (12.5 mm). Always check both brushes. Brush Repair Kit 236–967, which includes spring clip 112–766, is available for motors manufactured by Pacific Scientific. NOTE: Replacement brushes may last only half as long as the original ones. To...

Displacement Pump Repair 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: Packing Repair Kit 235–703 is available. Refer- ence numbers of parts included in the kit are marked with an ...

Displacement Pump Repair Intake valve repair (See Fig. 17) 1. Remove the suction hose. See Step 2, Removing the pump. 2. Unscrew the intake valve (118). Remove the o-ring (119*), ball guide (120), stop pin (122*) and ball (121*) from the valve. 3. Clean and inspect the parts for wear or damage. Repl...

Motor 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. 26 except where noted. 1. Relieve pressure. 2. Try to stop the pump with the piston rod (107) in its lowest position. T...

Motor Start Board 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. 27 for this procedure. 1. Relieve pressure.2. Remove the junction box screws (56) and lower the junction bo...

Drive Housing, Connecting Rod, Crankshaft 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: Inspect parts as they are removed. Replace parts that are worn or damaged. 1. Remove the dis...

Pressure Control 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. NOTE: The pressure control (64) cannot be repaired or adjusted. If it has malfunction...

308-548 31 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. 31 for this procedure. 1. Remove the displacement pump. See page 22.2. Use a pull–twist motion...

Drain Valve 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. 44 42a 42b 43 45 Apply thread sealant Handle shown in closed position Apply grease to face of base 42 Torque into pump manifold ...

Displacement Pump Parts Drawing and List Model 236–787, Series A Includes items 101 to 127 Ref No. Part No. Description Qty 101 187–611 MANIFOLD, pump 1 102 176–758 PACKING NUT 1 103* 176–757 GLAND, female, throat 1 104* 176–997 V–PACKING, plastic, throat 3 105* 176–755 V–PACKING, leather, throat 2 ...

Sprayer Parts Drawing Model 231–353, Series A 06198 33 20 4a 12 18 15 16 45 37 29 32 25 12b 12a 64 30 19 19 6 17 31 34 21 38 36 46 4 39 28 56 43 42 42a 42b 4e 44 REF 32 REF 33 11 23 63 HOSE AND GUN NOT SHOWN IN PROPORTION TO SPRAYER 67 74 42c 42d 11b 14 4g INSIDE LABEL 35 OUT- SIDE LABEL 4f See deta...

Sprayer Parts List Model 231–353, Series A Includes items 3 to 89 as listed below Ref. No. Part No. Description Qty. Ref. No. Part No. Description Qty. 4 { 236–965 MOTOR KIT Includes items 4a to 4g 1 4a. 100–069 . BALL, sst, 1/4” dia. 1 4b. 111–616 . TERMINAL, flat, 1/4” (f), 18 awg 2 4c. 107–503 . ...

36 308-548 Technical Data Power Requirements 120 VAC,60Hz, . . . . . . . . . . . . . . . . . . . . 1 phase, 15 amp minimum Generator 3000 Watt minimum . . . . . . . . . . . . . . . . . . . . . . . . . . Working Pressure Range 0–2750 psi (0 – 195 bar) . . . . . . . . . Motor 1/2 hp . . . . . . . . . ...