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Yoke Cap and Backframe Assembly
Point yoke cap assembly south and temporarily secure to ground pole with locking bolts. Push M12 x 35 mm round head
square neck pivot bolt through center square hole in cap top plate and attach channel assembly. Secure with M12 hex nut and
lock washer. Torque to 11-15 N-m (8-11 ft-lb). Assemble bottom tube (14) to backframe (28) as shown. Torque M12 x 19 mm
special bolt (29) to 47-54 N-m (35-40 ft-lb). Install backframe assembly onto yoke cap assembly.Secure with M20 x 140 mm
hex bolt and hex nut (9 & 11). Loosen M12 hex bolt (10) and remove one M22 hex nut (7) from elevation adjsting screw (6)
and insert into trunnion (8). Trunnion (8) in position shown is for 12˚ and above elevation. If elevation is less than 13˚, pivot
trunnion 180 degrees. Reinstall M22 hex nut (7). Do not tighten. Run up M22 hex nuts (7) on elevation screw (6) and place
backframe in birdbath position.
SOUTH
Yoke Cap
Assembly
Ground Pole
Antenna Installation
Insert four M12 x 100 mm round head square neck bolts (1) into reflector (2) and place reflector onto backframe. Secure
reflector to backframe with four M12 lock washers and hex nuts (4 & 5). Tighten and torque to 27 N-m (20 ft-lb). Torque
cross arm bolts (12) 4 places to 58 N-m (40-45 ft-lb).
IMPORTANT: "UP" arrow on reflector must be as shown. Make sure round head square neck bolts are seated correctly be-
fore securing reflector to backframe. Pre-torque (4) M12 x 35 m round head square neck bolts (Item 27) to 12 N-m (8-10 ft-lb).
1
4 Places
4
5
10
Locking
9
Bolts
11
14 28
Back Frame
2
UP
6
7
8
26
6
17
14
3
4
16
Back View
of Yoke Cap
17
3
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