When line marking on the road our graco linelaser 3900 IV pulsates/winks ie my line width starts at 100mm but constantly varies between 100mm and 85mm thus the winking/pulsating. How do i rectify this??
Hi Brendan,
Your LineLazer is probably single stroking. This means that one of the 2 valves is not closing properly so that the pump is only working on the down or the up stroke. You need to switch off, depressure and open up the pump lower by knocking the lugs on the conical housing. Be careful not to lose any parts and note their order. clean out the inlet velve parts where the problem is usually found. With the inlet valve housing removed check the outlet valve in the end of the piston; use a small screwdriver and a torch; you will have lie on your back to do this. Call Lion Industries on 01543 251 560 if you still have a problem.
David Dundas
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