Assessments - 3, GPA: 4.3
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Always use the lowest pressure that will give the results you want. NOTE: Most foam materials are designed for a 1:1 mix ratio, and the 2 components usually have about the same viscosity. Pressures for these materials should be kept in close balance. Howevei, materials with other mix ratios or differ r-n! viscosities may require corresponding pressyn imbalance. Changing the temperature affects the viscosity and reaction time of the material. Increase the temperature in 5° f (3° C) increments up to 120° F (49° C). Raising the temperature reduces the viscosity, giving a wider and finer spray pattern; much like raising the pressure does As :he temperature gets too high, the pattern may c,Pve,ot* streaks of mist and split into two circle'- A\ chemical reaction may start in mid-air, resuiting in rs undesirably rough surface. CHAMBER RECOMMENDED SIZE OF SPRAYING DISTANCE PATTERN 208-689 : 0.046" (1.17 mm) 12" (300 mm) 6" (150 mm) 208-690 : 0.062" (1.57 mm) 18-20" (450-500 mm) 8-9" (200-230 mm) 208-691 : 0.078" (1.98 mm) 18-20" (450-500 mm) 10-12" (250-300 mm) 307-089 3 If you have trouble getting a good spray pattern, shut down the system, relieve fluid pressures, and thoroughly clean the nozzle and needle. If, during regular spraying, the spray pattern starts to develop streaks, or drifts from the true circle, check to be sure the spray tip is clean. Next, check to see that adjustments have not changed, such as the gun needle setting, and hose temperature. Each time you use the gun, before starting to spray, coat the entire gun with good mold release. This will allow any spray particles that accumulate on the gun to be cleaned off easily. If not coated, spray particles are extremely difficult to remove. Always leave hoses connected to the gun unless shutting entire system down or if it is necessary to service gun. SHUTDOWN PROCEDURES 5-60 minutes: Shut off both A and B material inlet valves. Trigger the needle back and forth several times, while squeezing the lube bottle until lubricant is seen to run out between needle and packing nut. Engage trigger safety. Before resuming, check fluid pressures and test spray off target. Overnight: Shut off the pump and trigger the gun to relieve fluid pressures. Shut off the material inlet valves. Remove and clean the check valves and filters. Remove plugs from cleanout ports. See Fig 4. Flush out ports with gun cleaner (cellosolve). Back off the needle adjusting screw 1 turn, trigger the gun and clean out the injection slots with the proper size cleanout spade. Also clean off the exposed part of the needle. Do not scrape with anything that might scratch the needle. See Fig 3. -CAUTION- Don't let go of the trigger while the spade is in the slot, or the needle will break off the spade and ruin the chamber. It is best to shut off or disconnect the air supply while holding the gun trigger, so you can let go of the trigger and still have the needle retracted for cleaning. Weekly or as often as necessary: Remove and clean the needle and nozzle. Refer to SERVICE section. If necessary, clean and lubricate the air cylinder shaft. SERVICE p-WARNING- ALWAYS relieve fluid pressures before starting to service this gun. After disconnecting material hoses, plug the ends with % NPT plugs to protect the material from air and dirt. PROBLEMS Not enough pressure or volume with pump running Excessive surge at spray gun Poor atomization Too much pressure or volume Foam has rough surface Tails or fingers in spray pattern Spitting at spray gun Gun will not spray Gun will not stop spraying Static sparking from gun Material not mixed properly TROUBLESHOOTING CHART PROBABLE CAUSES AND REMEDIES Pump pressure setting too low (Adjust) Pump pressure setting too high (Reduce) Clogged gun filter (Clean) System heater inoperative (Clean, service) Material reacting too fast (Reduce heat) High flow rate (Use smaller needle & nozzle) Clogged nozzle (Clean) Worn or damaged gun parts (Service) Needle sticking (Clean, lubricate) Improper spraying technique Unit and work improperly grounded (See SAFETY PRECAUTIONS page 2) 4 307-089 Disassembly of Gun Shut off the pump and trigger the gun to relieve fluid pressures. Shut off the material valves, squeeze the lube bottle and trigger the gun several times to lubricate the needle. Turn the needle adjusting screw all the way counterclockwise, pull the trigger and hold it while you shut off or disconnect the air supply. This leaves the needle fully retracted, for easy removal later on. Disconnect the ball valve swivels from the check valves. Remove the air tube. Unscrew the air inlet swivel and capscrew from the gun butt and pull the air tube out of the gun head. Remove the trigger and check valves. Remove the bottle socket and loosen the setscrew. Loosen the packing nut and unscrew the head retainer nut. Pull the head and nozzle off of the needle: the needle will slide forward until the air piston reaches its stop, then a shar...
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