Genie Super Tower ST-20 Parts & Service Manual

Also see for Super Tower ST-20: Operator's manual

Genie Super Tower ST-20 Parts & Service Manual Manual pdf 35 page image

Part No. 32951 Genie Super Tower 5 - 3November 2005 Section 5 • Repair ProceduresMast AssemblyHow to Release the Safety BrakeWhen Servicing the MastThe safety brake system will lock when themachine is tilted horizontally. When the brake islocked, the columns can extend but not retract. Ifthe safety brake system locks while you areservicing the mast, use one of the followingmethods described below to release the brake;A The first method allows you to release eachcolumn successively starting at the carriageand removing columns one by one. This isdescribed above in How to Disassemble theMast Assembly, steps 6 and 7.B The second method allows you to release anycolumn in the assembly regardless of positionbut requires a custom made tool. The tool is apiece of 1/ 8 to 3 /16 inch / 3 to 4 mm diameter stiffwire bent in an L shape with one end 1 inch /25mm long and the other end 16 inches / 41 cmlong. The installation of a handle on the 16” endwill make it easier to use.Using the special tool, reach from the bottom ofthe column and into the safety brake accessslot in the inner side wall of the column. Slidethe carriage away from the base about1 inch / 2.5 cm while reaching through the farupper end of the slot. Position the short end ofthe tool above the safety brake rollers and pullback on the tool. Slide the released column outthe bottom of the mast assembly.2-1How to Disassemble theMast Assembly1 Remove the cable retaining fasteners from thewinch drum. Then remove all of the cable fromthe drum.2 Tip the machine backwards and rest the top ofthe number one mast on an appropriatesupport. The mast assembly should be levelwith the Carriage up.Bodily injury hazard. Use properlifting techniques.3 Remove the mounting fastener from the cableanchor on the last column (carriage side).4 Remove the cable from the mast by pulling onthe cable anchor end of the cable.Bodily injury hazard. Cables canfray. Always wear adequate handprotection when handling cable.5 Slide the carriage forward about 1 foot / 30 cmto expose the column stop mounting fastenerattached to the bottom end of the top column,below the carriage. Remove the fastener andthe stop.6 Use a hex key wrench through the access holesin the carriage to release the safety brake.Slide the carriage away from the base1 inch / 2.5 cm while reaching through bothslots. Position the hex key above the safetybrake rollers and pull back on the wrench.7 Remove the carriage by sliding it out the bottomof the mast towards the base while holding thesafety brake rollers in position with the hex keywrench.8 Repeat steps 5 through 7 for each remainingcolumn.REV B