Abstract: A top drive power swivel assembly for well drilling rigs having a travelling frame for moving along a drilling tower. The travelling frame has at least two lower and two upper travelling frame extensions. A housing has at least two upper and two lower housing extensions each with an opening. A first connector penetrates openings of upper travelling frame extensions and openings of an upper housing extensions engaging the travelling frame to the housing. A second connector penetrates openings of lower travelling frame extensions and openings of lower housing extensions to securely engage the travelling frame to the housing. A top drive power swivel mounts to the housing and the top drive power swivel receives power from hydraulic motors. Various sheave assemblies mounted to the travelling frame engage a hoisting means. Guide wheel assemblies disposed on the travelling frame engage the tubulars.

Abstract: A shock mounted top drive comprising a traveling frame for moving along a drilling tower, the traveling frame comprising a first and second housing section, at least one set of sheaves mounted to the upper section of each housing section, a guide wheel assembly secured to the outboard side of each housing section, at least one swivel support disposed on the inboard side of each housing section, at least one shock absorber disposed on each swivel support, and at least one upper stop connected to the inboard side of each housing section. A top drive power swivel, which has a housing and a rotating drive shaft, is secured to the traveling frame using a plurality of removable top drive retainers. The top drive retainers engage the inboard side of each housing section between the upper stops and the shock absorbers.