Specifications

Southwestern Industries, Inc.
ProtoTRAK SMX K2, K3, K4 & Retrofit Safety, Installation, Maintenance, Service & Parts List Manual
122
Figure 50
Ball Screw/Yoke Assembly
9. In the ballnut flange there are two tapped 10-32 holes. One for the provided elbow oil
fitting, and one for a 10-32 setscrew. For the X ball screw put the elbow oil fitting in the
hole on the radius of the flange, and the setscrew in the hole on the flat. The function of
the setscrew is only to prevent oil from flowing out of the ballnut. Screw it as far as
possible being careful not to contact and deform the nylon wiper.
10. Attach the provided plastic oil line to the elbow oil fitting.
11. Slide the ball screw into the yoke with the flange of the ballnut to the left. Do not install
the 5/16-18 x 1 3/4” screw yet.
12. Secure the yoke to the saddle with the 4 screws, make it snug but not tight. You will
need to move the yoke a little to align the ball screw.
13. Secure the ballnut to the yoke with 5/16-18 x 1 3/4” screws.
14. (Optional) If the yoke was pinned previously, replace the pins and then tighten the yoke
to the saddle.
15. If the yoke was not pinned, it will be necessary to align the ball screw: