TERION UM20-100111B, Руководство по установке, Страница: 21 / 78

13. Attach the upper support bracket to the tractor. Typically, the upper support attaches
to the tractor’s sun visor using an existing fastener. Position the upper support
bracket so that the antenna hole will align with the antenna base mount.
•
If you are using an existing bolt, remove the bolt. Place the bolt through a fender
washer, and then through the upper support. Peel the back off the foam tape and
reattach the bolt to the tractor.
•
If there is no existing bolt (or hole), drill a 1/4" hole in the sun visor and bolt the
upper support to it with a fender washer and 1/4" self-locking nut on the inside of
the visor.
Note: In the next option, the rivnut, 1/4" bolt, and fender
washer are very important. Do not try to simplify this step by
using a sheet-metal screw.
•
On some trucks, there is no sun visor to install the upper support. In that case,
drill a 25/64" hole on the truck and install a 1/4" rivnut in the hole. Fasten the
upper support with a 1/4" bolt and a fender washer.
14. Place the rubber washer, and then the curved lock washer, on the stud mount bolt.
Note: It is ESSENTIAL that the curved lock washer be placed so that it
curves towards the rubber washer (refer to the illustration on page 4-3).
15. Place the stud mount assembly into the base mount bracket, put the star washer on the
stud mount shaft, and then thread the stud mount nut about half way up the shaft.
Note: When applying Loctite, only a small amount is required.
16. Apply a small amount of Loctite 242, or similar locking compound, to the threads that
will be covered by the stud mount nut when it is fully tightened.
17. Tighten the stud mount nut finger tight, and then use a wrench to tighten it another
3/4 turn to 1 turn . This should result in a torque of approximately 10 foot-pounds.
18. Verify the resistance from the antenna mount to the frame rail is less than 1 ohm.
Note: For this measurement, make sure the power is not plugged
into the ITU, and the coax cable is not connected to the antenna.
The truck must be off, and everything using the truck's batteries
must be off (e.g., turn off lights, keep the doors closed so the cab
light does not come on, turn off any appliances like refrigerators,
etc.).
19. Place a bead of dielectric silicone grease (clear grease) around the base of the antenna
stud mount where the upper portion of the coaxial cable connector will be connected.
Leave the last three to four threads clean. This will prevent moisture from getting
into the assembly and still maintain good metal-to-metal contact with at least three
threads.
Note: The easiest way to determine where the upper part of the
connector will be connected is to connect it and examine how high
4-5
Mobile Messaging System Installation Manual June 15, 2001
UM20-100111B Terion, Inc.