16
3-10. Locking Drive Arm to Torque Tube
Refer to Model 199 DPU manual. For explosionproof units, refer to Figure 5-3,
Model 291 Detail Drawing, pg. 28 (See Warning on pg. 9).
1. Slip drive arm over torque tube shaft; clear end of torque-tube housing
by approximately 0.030-in. 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.)
3-11. Troubleshooting
(See
Warning
on pg. 9. Refer to Table 3-1 and Model 199 DPU manual.
figure 3-4. locking Drive arm to Torque Tube
