1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 67Get this manual
COOLING SYSTEM ASSEMBLY
Install the fan motor in the shroud and ighten the three screws securely
Install the fan onto the motor shaft by aligning their flats Apply locking agent to the fan motor shaft threadsInstall and ighten the special lock nut Connect the breather tube to the fan motor