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SHEET 3-1765 August 1, 1980 (Replaces 0-1508 ) J'UNARCO-ROHN"� MAST ASSEMBLY 9X - STANDARD // HBX - HEAVY DUTY // HOBX - EXTRA HEAVY DUTY TOWERS 1. Two U-bolt assemblies with "L" brackets ire supplied for installing the mast. These 'L" brackets are bolted through the slotted holes on the rotor and top plate with the short legs of the "L" bracket toward the outside of the tower. See Drawing C-750429. • 2. Run the U-bolt through the open side of the formed "V" clamp and into the "L" bracket placing the 5/16" nuts and washers on the U-bolt loosely. 3. To install the mast, place one end of it through the upper 11-bolt assembly end plate and slide it down into the lower U-bolt assembly. Then tighten the U-bolt assembly to hold the mast. 4. Adjustments to make the mast vertical may be made by moving the "L" brackets in the slotted holes. The HBX - Heavy Duty and HDBX - Extra Heavy Duty Towers are furnished with a mast clamp installed on the top plate made from a pipe floor flange, whi-h is provided with three bolts to be used as set screws to secure the mast. The box of hardware consists of one U-bolt assembly as described above and it can be installed on the lower plate as is instructed above, if required. ASSEMBLY INSTRUCTIONS 3REAKING DOWN BUNOLE 1. If your tower includes the 3' mast and/or three 4' base stubs, remove them. Remove the package of nuts, bolts, and washers. 2. Lay the bundle on its side and remove the tower sections. Start with the innermost section of the package (the smallest section) and remove by pulling out with Quick, firm ;erKs. It is not necessary nor desirable to pry toe termer sections out wlth tools as damage may result. 3. Inspect all tower sections on delivery to make sure there are no loose or broken rivets caused by transport mis- har:lPng. If a rivet is broken or loose, it should be replaced by a snug -fitting machine bolt and nut, securely tightened. TOWER After you have Chosen the desired type of base for your tower (concrete base with 3XB concrete base stubs, BXHC hinged concrete base, 9XCA cylinder base which hinges over and requires no _oncrete) and it is prooerly installed per base instructions, boll. the base section (the largest section) to the base. Proceed with the erection as follows: 1. The legs on each higher section slide inside the previous one and should be positioned on the rivet stop in the previous leg. (This rivet stop is to prevent the tower section being installed from slipping through the previous section and is not for the purpose Qf aligning the assembly hole- (Spec,al Note: The 3X8 section does not have a rivet stop in it, so extreme caution should be used when installing the BX7 section into the BX8 section.) Proceed by bolting together ea" section with the proper size bolts. 2. To erect the tower, section by section vertically, you should use in EFBX erection fixture for raising and locating the section being installed into the previous section. (Note: Do not use an erection fixture to lift more thar the weight of one tower section at a time.) By using BXHC or BXCA base the tower can be assembled on the ground and hinged up using extreme caution. When hinging up, watch for power lines, trees, etc. 3. Loose, missing or faulty rivets should be replaced with a similar sue nut and bolt which can be obtained at any local hardware store. NOTE: 3/8" bolts are to be used an BXi, 02 and the top of BX3 sections. 9/16" bolts are used on the bottom of the BX3 and all sections from BX4 through BX8 (BX8 is the largest section). One set of cross braces on one face of the tep section is purposely left off to ,'low easy &cress to the rotor plate for installing tt-- mast and rotor. (Note: Only one person should be on the tower at one time.) NOTES ON INSTALLING ROTATORS Most all makes of rotators can be installed on the rotor plate inside the top tower section of the BX standard towers. There is a short piece of tubing furnished with each tower that can be used as a thrust bearing (for 1-1/4" mast) with 'he mast clamp irstalled on the top plate as is described under the heading of Mast Assembiv. Up not install rotators on the HDBX too place. For the HBX - Heavy Duty and HDBX - Extra Heavy Duty Towers, when a rotator is used a 4" piece of tubing or pipe with an I.D. larger than the 0.0. of the mast can be installed in the pipe flange clamp and used as a bearing sleeve for the most to turn in. �• FOR INSTALLING THE ROTATOR ITSELF, FOLLOW THE PROCEDURES OUTLINED BELOW: Save �nline model rotators mount directly to the rotor plate. (The lower housing of -tor is not used when this !s Jone.) The necessary holes for mountinq most rotors are pre -punched in the plate no the bolts funs shed :o bolt the rower nousinq to the upper housing (4-1/4" x 1" bolts) are to be insertod f oottom of the plate upward and �-tu th. " .t is desirable to place 3/8' nuts to act as spacers between the „ -ter plate and the rottttr.