Operation, Disassembly and Assembly and Adjustment of a TAS65 Power Steering Gear 

This video provides an overview of the operation as well as a full internal view of a common power steering box used on commercial vehicles. The service manual referenced throughout the video can be found at the link below.
www.trwaftermarket.com/global...
Timestamps
0:00 - Intro
1:09 - Movement of the input shaft to output sector shaft
2:20 - Finding the center of the steering Gear
3:16 - Disassembly of the Steering Gear
8:22 - Operation of the Ball-Nut of the Rack Piston
9:50 - Removing the ball bearings from inside the Rack Piston
14:44 - Disassembly of the Rotary Control Valve
19:38 - Operation of the rotary control valve demonstrating road force operation of the valve..
23:39 - Reassembly of the rotary control valve into housing
26:30 - Checking the rotating torque or preload of the rotary control valve
28:43 - Final Steering Gear Adjustment
39:00 - Summary of Proper Adjustment
39:40 - You should check for this on your used Steering Gear
Thanks for Watching, Hopefully the timestamps help in this beast of a video.