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Be sure to observe all warnings. If you are using powdered cleaners, mix them thoroughly in a separate pail before adding them to a supply drum. Undissolved powders are extremely abrasive and may damage pump parts. Wear appropriate protective clothing, such as waterproof outerwear and eye goggles, according to the cleaner manufacturer’s recommendations. Cleaning chemicals may be toxic, and cause serious irritation to your eyes or skin. Flushing To reduce the risk of fluid injection injury, static sparking, or splashing, relieve the pressure, and remove the spray tip (spray guns only) before flushing. Hold a metal part of the gun/valve firmly to the side of a grounded metal pail and use the lowest possible fluid pressure during flushing. 312585E Operation Starting the Pump 1. Open the bleed-type master air valve (A). 2. Trigger the gun into a grounded metal pail, holding a metal part of the gun firmly to the pail. 3. Slowly open the air regulator (E) until the pump starts running. 4. Run the pump slowly until all the air is purged, release the gun trigger, and lock the trigger safety - the pump will start and stop as the gun is opened and closed. Adjusting the Pump • Always use the lowest pressure necessary to get the desired results. • Never allow the pump to run dry of fluid being pumped. A dry pump will quickly accelerate to a high speed, possibly damaging itself. If your pump accelerates quickly, or is running too fast, stop it immediately and check the fluid supply. If the supply container is empty and air has been pumped into lines, prime the pump and lines with fluid, or flush and leave filled with a compatible solvent. Be sure to eliminate all air from the fluid system. • The piston and intake check valves of displacement pump 247599 are factory-set for light viscosity fluids. This setting minimizes surging at pump stroke changeover. To adjust the valves for heavier viscosity fluids, see manual 312745. • Always stop the pump at the bottom of its stroke to prevent fluid from drying on the rod and damaging the throat packings. When you finish pumping, always relieve the pressure, page 9. • If you are pumping fluid which dries, hardens, or sets up, flush the system with a compatible solvent as often as necessary to prevent a build up of dried fluid in the pump or hoses. • Every 40 hours of operation, check that the packing nut is tight. Relieve the pressure, page 9. Then, tighten the packing nut just snug - do not overtighten or the packings may be damaged. 10 312585E Operation 312585E 11 Troubleshooting Troubleshooting 1. Relieve the pressure, page 9. 2. Check all possible causes and problems before disassembling the pump. Problem Cause Solution Pump fails to operate. Restricted line or inadequate air supply; closed or clogged valves. Clear; increase air supply. Check that valves are open. Obstructed fluid hose or gun/valve; fluid hose ID is too small. Open, clear*; use hose with larger ID. Fluid dried on displacement rod. Clean; always stop pump at bottom of stroke; keep wet-cup 1/3 filled with compatible solvent. Dirty, worn, or damaged motor parts. Clean or repair. See manual 311238. Pump operates, but output low on both strokes. Restricted line or inadequate air supply; closed or clogged valves. Clear; increase air supply. Check that valves are open. Obstructed fluid hose or gun/valve; fluid hose ID is too small. Open, clear*; use hose with larger ID. Bleeder valve open. Close. Worn packings in displacement pump. Replace packings. See displacement pump manual 311825 or 312745. Pump operates, but output low on downstroke. Held open or worn intake valve. Clear valve; service. See displacement pump manual 311825 or 312745. Pump operates, but output low on upstroke. Held open or worn piston valve or packings. Clear valve; replace packings. See displacement pump manual 311825 or 312745. Erratic or accelerated pump speed. Exhausted fluid supply. Refill and prime. Held open or worn piston valve or packings. Clear valve; replace packings. See displacement pump manual 311825 or 312745. Held open or worn intake valve. Clear valve; service. See displacement pump manual 311825 or 312745. * To determine if the fluid hose or gun is obstructed, relieve the pressure, page 9. Disconnect the fluid hose and place a container at the pump fluid outlet to catch any fluid. Turn on the air power just enough to start the pump. If the pump starts, the obstruction is in the fluid hose or gun. 12 312585E Repair Disconnect the Displacement Pump See the Parts drawings on pages 14-17. 1. Flush the pump, if possible. Stop the pump at the bottom of its stroke. Relieve the pressu...

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