It is important that the meter section is always flowing full. A valve downstream of the propeller or blocking the pipeline up higher than the meter section may be required to guarantee full pipe flow. U-shaped fitting installed to guarantee full pipe flow in the meter section. This fitting can be fabricated by most irrigation dealers. Follow the manufacturer's maintenance recommendations.
Some meters require periodic lubrication.
Anything that causes the propeller to drag will cause inaccurate measurement. Therefore, check the meter periodically to make sure the propeller spins easily. If it doesn't, check for obstructions that may cause the propeller to bind or for a worn shaft, bearing, or gear. A good way to store meters during the off-season is to set them on end with a board over the top. Keep rodents from the propeller.