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3-8. DPU Maintenance
DPU inspection/cleaning/repair/service procedures, along with applicable
WARNING notices, are presented in the appropriate (separate) DPU manual.
3-9. Locking Drive Arm to Torque Tube
(Also see appropriate (separate) DPU manual.)
1. Slip drive arm over torque tube shaft; clear end of torque-tube housing by
approximately 0.030-inches before securing to prevent interference.
2. To tighten drive arm assembly onto torque-tube shaft:
a. While supporting block/shaft, tighten clamp screw until snug to shaft.
b. Still supporting block/shaft, tighten clamp screw an additional:
• Sintered: 1/3 to 1/2 turn (This screw can normally turn one full
revolution before breaking.)
• Slotted: 1/4 to 1/3 turn (The slot in the slotted clamp block should
still be open.)
Figure 3-9. Locking Drive Arm to Torque Tube
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