2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 15Get this manual
MAINTENANCE Grease Lubrication Points
There are grease fittings on each lower control arm, each rear bearing carrier, on the upper control arm pivot point on the transmission and on the propshaftApply maximum of pumps of grease at each of these areasItem Front Propshaft Yoke Control Arms (front and rear) Rear Bearing Carrier Transmission Upper Pivot Point Grease fittings (3 pumps maximum) every 500 miles (800 km)Grease before long periods of storage, and after pressure washing or submerging the ATVRecommended Lube Method Frequency