Heavy Duty field mast

A telescoping mast assembly, comprising:

• at least three elongate tubular sections, wherein a first, a second, and a third elongate tubular section each has an upper end and a lower end;
• wherein said second elongate tubular section is telescopically received by said first elongate tubular section;
• said third elongate tubular section is telescopically received by said second elongate tubular section;
• an axial drive screw centrally located in said mast assembly for extending and retracting said second and third elongate tubular sections;
• and,
• a nut carrier assembly secured to a bottom section of each of said second and third tubular sections, said nut carrier assemblies each comprises a threaded nut housed within a collar, said threaded nut engages corresponding threads on said drive screw;
• and
• a gear assembly for rotating said drive screw, said gear assembly housed within a gearbox housing;
• a braking mechanism comprising a locking cylinder and a locking plate mounted to said gearbox housing;
• and
• a cover plate mounted to said locking cylinder.