Part No. 139378 Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N 3 - 23Section 3 • Scheduled Maintenance ProceduresJune 2011REV A Checklist D ProceduresD-1Check the Primary BoomWear PadsNote: Genie specifications require that thisprocedure be performed every 1000 hours orannually, whichever comes first.Maintaining the primary boom wear pads in goodcondition is essential to safe machine operation.Wear pads are placed on boom tube surfaces toprovide a low friction, replaceable wear padbetween moving parts. Improperly shimmed wearpads or continued use of worn out wear pads mayresult in component damage and unsafe operatingconditions.1 Measure each wear pad. Replace the wear padonce it reaches the minimum allowablethickness. If the wear pad is still withinspecifications, shim as necessary to obtainminimum clearance with zero binding.2 Extend and retract the primary boom throughthe entire range of motion to check for tightspots that could cause binding or scraping.Note: Always maintain squareness between theprimary boom outer and inner tubes.Models without rotating jib boom:Primary boom wearpad specifications MinimumTop and side wear pads 5 /8 inch(extension end of boom) 15.9 mmBottom wear pads 5 /8 inch(extension end of boom) 15.9 mmBottom and side wear pads 5 /8 inch(pivot end of boom) 15.9 mmTop wear pads 3 /8 inch(pivot end of boom) 9.5 mmModels with rotating jib boom:Primary boom wearpad specifications MinimumAll wear pads 3 /8 inch9.5 mm
