HC950 • HC950 SSP HC970 • HC970 SSP - Wagner

GBRemedy in case of faults9.4 Material feed pumpType of malfunctionA. A sufficient amount of coatingmaterial is ejected only with anupward stroke, or upward motionof the piston rod is slow anddownward motion is fastB. A sufficient amount of coatingmaterial is ejected only with adownward stroke, or downwardmotion of the piston rod is slowand upward motion is fast.C. Piston rod moves up and downquickly.D. Piston rod moves up and downslowly when the spray gun isclosed.E. Not enough pressure to the spraygun.F. Piston rod sputters when strokingupward or downward.Possible cause1. Inlet valve is leaky due to impurities orwear.2. Coating material viscosity is too high,preventing it from being sucked up.1. Outlet valve leaky.2. Lower packing is worn.1. Suction tube projects over the fluidlevel and sucks in air.2. Coating material viscosity is too high,preventing it from being sucked up.3. Ball in inlet valve housing is stuck.1. Loose connections.2. Relief valve is not closed completely.3. Relief valve worn.4. Lower packing worn.5. Ball in inlet valve housing and ballin outlet valve seat are not sealingproperly.1. Tip is worn.2. Filter cartridge in high-pressure filteris clogged.3. High-pressure hose is too long.1. Solvent has made the upper packingexpand.Measures for eliminating the malfunction1. Clean and check the inlet valve housing. Insert ball and fillwith water; if leaky, replace ball.2. Thin out according to the manufacturer’s instructions.1. Dismantle and check outlet valve seat. Insert ball and fillwith water; if leaky, replace ball.2. Replace.1. Refill the coating material2. Thin out the coating material according to manufacturer’sinstructions.3. Vent air from material feed pump and turn the relief valveknob to the left (k Circulation).1. Dismantle inlet valve housing, clean ball and valve seat.Check all connections between the material feed pumpand spray gun.2. Turn relief valve handle (3) fully clockwise (p spray).3. Replace4. If the measures described above do not help, replacelower packing.5. Dismantle inlet valve housing and outlet valve seat. Cleanballs and valve seats.1. Replace2. Clean or replace the filter cartridge.3. Reduce length.1. Replace upper packing.HC 950 • HC 970 41