1. If the previous pump of customers is ordinary wear and tear, such as bushing abrasion; before installing a new pump, Please replace the engine oil, filter, and add fresh oil in the new pump;
2. If the previous pump of customers is not abraded as normal, such as scraping the Case inside, broken shaft, appears the iron dusts or other conditions; customers need to clean the oil tank before installing a new pump, clean up scrap metal, clean up the tubing path, and add fresh oil in the new pump;
3. Low speed working of engine for three minutes and then start to use as normal.