Choppers (refer to fig. 1 and fig. 2)

P: Air motor on chopper assembly slows down or stalls while pulling roving through.

S: There are composite vanes inside the air motor and occasionally will need to be lubricated. Remove bottom fitting from air motor and add a light weight lubricant (Marvel air tool oil or equivalent) to inside of motor; about a teaspoon of oil should be sufficient.

P: RPM's increase and decrease while spraying.

S: Check for correct size of air hose and quick connects. Check air supply for proper CFM's. Inspect and clean plug in oiler and make sure to oil daily. Inspect air motor for wear and repair as needed.

P: Rubber wheels are wearing quickly or blowing apart.

S: Check tension between rubber wheel and cutting head and readjust if needed. If running at very high RPM's consider changing glass yield or number of roving and direct holes in blower tube in the direction of the rubber wheel.

P: Lengths of cut glass are inconsistent.

S: Inspect for worn or broken blades and replace as needed. Inspect rubber cutting wheel for wear and replace as needed. Check tension between cutting head and wheel and adjust if needed.

P: Chopper keeps plugging.

S: If chopper speed is to low, increase RPM's. Check for improper blower air adjustment and readjust if needed. Check tension on cutting head and wheel and adjust as needed. Check rubber wheel and blades for wear or damage and replace as needed. Inspect gun roving for resin overspray or static build up and address as necessary. Check roving guide tension and adjust as needed.

P: Chopped fiberglass is concentrating in center of spray pattern.

S: Glass is entering spray too far out from gun. Adjust chopper down so glass enters resin closer to gun.

P: Chopper mounted on LPA-III gun does not engage when gun is triggered.

S: Inspect spool valve in chopper mounting block for contamination of water and oil and clean as needed. Inspect o-rings for breakage or wear and replace as needed.

Fig. 1

Fig. 2