Clean top and bottom jaws with mineral spir-
its. When dry, apply a thin coat of ISO 32 or
equivalent oil to the mating surfaces.
Place top jaws on bottom jaws so alignment
rings (see example below) fit into alignment
slots and screw holes are aligned.
Note: Make sure stamped numbers of chuck
jaw guide, bottom jaw, and top chuck corre-
spond with each other to ensure jaws safely
and evenly grip workpiece.
Jaw on Side
Apply a thin coat of ISO 32 or equivalent oil
to cap screw threads to prevent screws from
seizing under operational forces.
Thread the cap screws through the top jaws
into the bottom jaws and finger tighten them,
then back them off
Use chuck key to converge jaws to the center
so they are evenly up against one another
and even in height.
Fully tighten cap screws—do not overtighten.
Check jaw alignment. They should be evenly
up against one another with no gaps and
even in height.
— If this is not the case, repeat this procedure
until they are.
The safety set screw under bottom jaw #4
(see example below) prevents the jaws from
moving beyond safe engagement with the
scroll gear. Unsecured jaws could fly off the
chuck during operation resulting in serious
personal injury to operator or bystanders.
Always make sure this set screw is prop-
erly installed and tightened when using the
It is important that the chuck is properly mounted
to the lathe to ensure safe and accurate turning
(see the example below).
Model T10809 Wood Lathe Chuck Set