outer body 440 j a stem 440 a seals 440 b bearing 440 c retaining ring 440 d cover plate 440 e and dust shield 440 f the stem 440 a is positioned on the main shaft 302 with a shoulder 440 g and held in place e g with a friction lock clamp 440 h fig1 c the shoulder 440 g and clamp 440 h transfer vertical loads from the link tilt assembly 320 to the main shaft 302 hydraulic pressure is reduced by valves 440 i fig1 a in an inlet manifold 316 b prior to the pressure passing through the swivel this reduces the pressure on the seals and extends their life the pressure is then increased with an hydraulic booster 491 fig1 h to the required working pressure to provide sufficient power for desired operations hoist rings 442 are connected to the link tilt frame 414 a pressure filter 452 connected to the inlet manifold 316 b receives pressurized fluid from the service loop and transmits it to the inlet manifold 316 b this filter 452 protects pressurized hydraulic circuits of the system from particle contamination a filter regulator 454 controls air pressure supplied from the service loop to the pneumatic compensators 326 a 326 c the inlet manifold 316 b provides hydraulic oil distribution and various control functions to the hydraulic components in the system fig1 e shows the connection of a powered cylinder apparatus 312 to the link tilt frame 414 a pin 462 secures an end of the apparatus 312 to the frame 414 fig1 a is a top view and fig1 b is a bottom view of the slip body 340 bayonet mounts 464 on the body 340.