2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 86Get this manual
LUBRICATION SYSTEM
UPPER OIL COOLER
INSPECTION
Remove the screw and front fender lidSCREW
Check the oil cooler air passage for clogging or damageStraighten bent fins with small, flat blade screwdriver and remove insects, mud or other obstructions with compressed airCheck for any oil leakage from the oil cooler and hose joints