Introducing the ultimate solution to prevent the front ‐torque tube stripping and vibration‐related issues for the

full range of ALIGN TREX 550 and 600 series helicopters. The upgrade provides all the components needed to

produce a fully‐adjustable gear mesh between the autorotation gear and front‐torque tube gears, giving the

pilot the ability to adjust for full‐gear tooth strength and accommodate both the MOD 0.6 (4.5 ratio) and MOD

0.8 (3.85 ratio) gearing to suit their flying style. Dual Aluminum 6061‐T6 Case Supports are provided for

improved stiffness and a so lid‐hold to the carbon frames for the Tail Boom Case, preventing any unwanted

shifting of the mechanics during flight for ultimate strength and smoothness of the tail gear train. In addition,

shims are provided for further adju stment of the bevel gears, further improving the strength a nd accuracy of

the tail gear train.

STEP 1: Disassemble the Tail Boom Case, Umbrella Gear Case, and Front‐Torque Tu be Gear as shown in the

image below. Remove the Radial‐Ball Bearings from the Front‐Torque Tube Gear.

Optional Tool: To aid in installation, a 12 mm or 0.5” Drive Socket will be useful to install the 0.25 mm Shims

onto the Front‐Torque Tube Gear as described in the next page.

FRONT-TORQUE TUBE GEAR

UMBRELLA GEAR CASE

RADIAL-BALL BEARINGS

0.25 MM SHIMS

TAIL BOOM CASE

12 MM DRIVE SOCKET