View and Download Graco LineLazer IV 3900 repair and parts manual online. Airless Line Stripers. LineLazer IV 3900 construction equipment pdf manual download.. Pressure Control Wiring Diagram Pressure Control Wiring Diagram Red clip on yellow Yellow TO ENGINE White/Yellow 5900 GROUND White/Red 3900/R300 GROUND ENGINE OFF SWITCH DISPLAY BOARD.. View and Download Graco LineLazer IV 3900 repair parts list manual online. Auto-Layout System Airless Line Stripers. LineLazer IV 3900 construction equipment pdf manual download.. A complete wiring diagram is on page 34. 5. Press in on two retaining tabs on each side of ON/OFF switch and remove switch. Page 18 Pressure Control Control Board.
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Repair - Parts List GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440-1441. Reference wiring diagram. Page 34. With pump switch ON and pressure turned to MAXIMUM, use a test light to check for power between clutch test points on control board.. (LineLazer IV 3900);. Reference wiring diagram. Page 34. With pump switch ON and pressure turned to MAXIMUM, use a test light to check for power between clutch test points on control board. Measure resistance across clutch coil. At 70_ F, the resistance must be between 1.2±0.2Ω (LineLazer IV 3900); 1.7±0.2Ω(LineLazer IV 5900); if not, replace pinion housing.