Also located on the LD/R are the three swing bolts and the guide pin for
interfacing mechanically with the TU.
Maintenance fixtures allow
servicing of the unit.
b. Traversing Unit (figure 1-11). The TU also includes controls and
indicators that assist the operator. Most of the controls on the TU,
however, are mechanical. The TU provides two mounting flanges to mate
the LD/R and the tripod to it.
Three swing bolts hold each unit in
place. The TU also provides a mounting surface for the night sight when
used. On top of the TU is a bubble level indicator to aid you when you
level the G/VLLD set.
The TU provides a right-hand grip. The hand grip allows you to rotate
the TU (and the LD/R) in azimuth and elevation. Gimbal locks secure the
unit when you attain the proper azimuth/elevation. Additionally, an AZ
ZERO ADJ knob allows you to set the AZ readout to the desired reference
heading. The interface connector (3P1) electrically connects the TU and
the LD/R. It mates with the LD/R connector (1J2) to provide power to the
TU and to allow azimuth and elevation data to be transmitted to the LD/R.
c. Tripod (figure 1-11). The tripod controls consist of mechanical
devices used to coarse and fine level the G/VLLD set when used in the
The clamp assembly located on each of the three legs
provides for coarse leveling. Always adjust the leg nearest the bubble
You fine level the G/VLLD set by adjusting the three
turnbuckles located between the tripod body and the adjustable legs.
Fine leveling is not required for DES mode, only for RNG1 or RNG2
modes. Adjust turnbuckles on the downhill leg first.
d. Night Sight AN/TAS-4 (figure 1-12). When you use the night sight
with the G/VLLD, both the night sight and its associated boresight
collimator have controls and indicators to assist you in their operation.
The night sight AN/TAS-4B, a modification of the AN/TAS-4, is
also used with the G/VLLD.
While the characteristics and
controls of the modified equipment differ somewhat from the
original version, its function with the G/VLLD is the same. To
avoid confusion, this lesson describes only the night sight
The night sight mounts to the G/VLLD set on the night sight mount, which
attaches to the TU.
Located on the eyepiece end of the unit is the
eyepiece itself with a diopter adjustment ring to focus the eyepiece.
Next to the eyepiece is a mounting