that'd be the pinion seal, a common problem - try to find one before you take it apart, likely to be the same for a lot of years

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics