6-10. Assembly of Worm and Gear Set (fig. 6-3).
The gear box
an entry gap for lubricant
entering side of the gear teeth; consequently, contact is required on the leaving side of the gear tooth driving face. To
properly aline the worm and gear set, use the following procedures:
Before reassembly of the worm shaft, apply prussian blue or lamp black to the threads of worm shaft.
Reassemble the gear box in accordance with instructions in paragraph 6-7.
After reassembly, turn worm shaft so that low-speed shaft makes one complete revolution in each direction of
d. Observe the markings on the teeth of the worm gear. If required, adjust the markings by changing shims from
one side of housing to the other.
e. Recheck per instructions in c and d above. If the marking is on entering side of worm gear tooth driving face,
move the entering side away from the center by shimming. This will cause the contact to move to the leaving side of the
When reassembling, use new oil seals, washers and shims.
After reassembly, fill gear box with oil. (Refer to LO 5-3895-372-12.)
Figure 6-3. Worm and Gear Assembly