hifi engine

Need service manual for Yamaha KK-930 for belt replace. (10-1-08 )

Need SERVICE MANUAL. User manual would be nice also.
I'm trying to replace the belt on Yamaha KX-930.
I have the transport out but I'm not sure if I can slip the new belt in without taking off the motor.
I'm sure I can slip the old belt out but it looks like a puzzle to get the new belt in.
Also need to know how to lube the motors.
And what kind of lubrication?
Need help with this sweet sounding HX Pro 3 head deck.
I bought it new in 1990.
It was top of line that year.
Thanks much for any help or advice.