Ball bearing whiffle tree.
The whiffle tree is the threaded rod mounted in the bottom of the pop up. A draw bar runs up and down the rod and pulls or releases the cables.
There were two types of whiffle trees used. Ball bearing and plastic delrin nut. This style of ball bearing tree is more commonly found on larger box sized units, and units with power lifts.
Measures 34-3/4 inches in overall length. Travel distance between the preset stops is 25-1/2 inches.
Enclosed ball bearing design. Coarse thread. Draw bar travel distance = 27 inches. 1 inch of draw bar travel = 1.71 inches of lift height.
Installation and Maintenance Tip: Liberally grease the screw with a lithium grease. We recommend Gulf Super Duty grease (part number NLGI-1 or equivalent).
The draw bar runs on a internal ball bearing system. Do not run the draw bar off of the whiffle tree or all the bearing will escape ruining the assembly. Running the draw bar over a hole in a removed stop can also result in failure.
Part number 4720G5201