Reflector/Backstructure Assembly - Andrew 4.9-Meter ESA Operating And Maintenance

Reflector/Back
Structure
Assembly
Step 1
Top View
Round Feed
Hole Faces
Upward
18" to 24"
1/2" ID x
1/2"
1" OD
1/2"
Lock
Hex Nut
Washer
Washer
(9999-61)
(9974-64)
(9997-65)
3/8"
3/8"
Lock
Hex Nut
Washer
(9999-60)
(9974-63)
3/8" ID x 7/8" OD
Flat Washer
(9997-145)
Use of A325 hardware eliminates slippage between mating surfaces under high loading
conditions as well as the need for future retightening. Refer to the A325 tensioning pro-
cedure in preceding installation text. CAUTION: Adhere to any special instructions sten-
ciled on crate relative to crate opening, contents removal and/or personnel safety.
Note: Install reflector/back structure assembly only when winds are less than 15 mph to
prevent damage to reflector panels and ease overall assembly.
Position 302649 Hub Assembly on 4 temporary wood support blocks and attach 302648
Short Struts to the Hub Assembly as shown in Figure 3.
Note: Securely tighten all stainless shoulder bolts followed by any A325 hardware fol-
lowing the A325 Hardware tensioning procedure mentioned previously.
Reference Drawing 240270
Short Strut
Extends Above Top
of Antenna Hub
Flat
302649
Hub Assembly
302648
Short Strut
3/8" ID x
3/8"
7/8" OD
Lock
Flat
Washer
Washer
(9974-63)
(9997-145)
3/8"
Hex Nut
(9999-60)
1/2"
1/2"
Hex Nut
Lock
(9999-61)
Washer
(9974-64)
1/2" ID x
1" OD 1/2" x 2-1/2"
Hex Head
Flat
Capscrew
Washer
(9997-65) (9963-137)
Rib #3
1/2" ID x
1/2" x 1-1/4"
1" OD
Shoulder
Flat
Bolt
Rib #4
Washer
(9858-39)
(9997-65)
Figure 3
14
302648
Short Strut
1/2" ID x
1" OD
Flat
Washer
(9997-65)
302649
Hub Assembly
Top of Hub Assembly
Rib #2
Rib #1 Rib #12
Rib #7
Rib #6
Rib #5
Rear View of Hub
Installation Procedures
1/2" ID x
1/2" x 1-1/4"
1" OD
Shoulder
Flat
Bolt
Washer
(9858-39)
(9997-65)
1/2" x 2-1/2"
1/2" ID x
Hex Head
1" OD
Capscrew
Flat
(9963-137)
Washer
(9997-65)
Rib #11
Rib #10
Rib #9
Rib #8