no schematics, but NAPA has a Ranco valve repair kit that's the only thing available: Napa/Balkamp #BK660-1000 .... sometimes better off to buy a new one or get it professionally redone

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