Instruction manual

Step 4: Installing the Main Shaft and Main Gear/Autorotation Assembly

Parts Required: Bag#

1 #0057 M4x4 socket head set screw 3D

2 #0059-1 M2.5x6 Socket Head Bolts 3D

1 #120-10 Main shaft 3D

1 #0840-6 M3x20 dowel pin 3D

1 #0865-6 M10.1x15.8x0.1 shim ring 3D

1 #0865-7 M10.1x15.8x0.2 shim ring 3D

1 #0866-10 M14.0x20.0x0.2 shim ring 3D

1 #0866-11 M14 Teflon o-ring 3D

1 #0866-12 Retaining collar (black) 3D

1 #0866-13 M14.0x20.20x0.1 shim ring 3D

2 #0875-1 Split type main shaft collars 3D

1 #115-22 M10.1x11.1x7.8 brass tube 3D

Refer to drawings #3D

and #3E

A. Select the #120-10 main shaft. NOTE

: The main shaft must be installed per the drawing. Apply a little light

oil to a cloth and briskly wipe-down the shaft. This will remove the protective coating. It is suggested that a

trial fit of the main shaft be preformed prior to assembling the main shaft components. It may be necessary to

loosen the lower block for alignment, re-tighten with the main shaft in place. As noted above, insert the

correct end of the main shaft into the upper main shaft bearing block at the top of the mainframe. Slide it

through so that 20-30mm is exposed below the bearing block.

B. Select two #0875-1 ASplit@ type main shaft collars. Examine the collars. One end of each collar has a flat

surface with a .30mm raised step near the bore. This end is always to face a ball bearing. Using this criteria,

slide two split collars onto the main shaft exposed below the upper bearing block. The upper collar should

have it=s flat surface (with step) facing up to the underside of the upper bearing block and the lower collar

should Aface@ the bearing in the lower block. Slide the main shaft further downward into and through the

lower bearing block until about 6.0 B 7.0mm is exposed below.

C. NOTE: The following orientation and selection of parts is considered the Anormal@ parts required. Parts Bag

3D will also contain two sizes of special shim rings (#0865-6 and #0865-7) which will only be used to fine-

tune an Aunusual@ fit and would only be utilized between the #115-22 spacer washer and the autorotation unit.

Select the #115-22 brass tube. Slide the tube onto the main shaft and up inside the lower bearing block.

Approximately 1.0mm will be exposed below the bearing block.

D. Select the previously assembled autorotation, the #0840-6 dowel pin, the #0866-10 shim ring, the #0866-11

Teflon o-ring, the #0866-12 collar and the #0866-13 shim ring. It should now be determined which (or both)

shim rings (#0866-10 and/or #0866-13) are required. Invert the autorotation assembly and note the Oilite

bushing exposed at the base of the housing. A shim ring should always be placed next to this bushing. As a

trial, install the #0866-10 M14.0x20x0.2 shim ring followed by the Teflon o-ring and the black retaining

collar. Temporarily insert the #0840-6 dowel pin through the collar (large I.D. hole) and into the autorotation

sleeve. Rotate the outer main gear against the inner and check smooth rotation. Move the gear up and down

between the upper gear and the remaining collar. The desired situation is to have the gear rotate freely but

have very little up/down play. If it is too tight, substitute shim ring #0866-13 for the #0866-10. If it is too

loose, add shim ring #0866-13. If there is no free play and the rotation is with very light friction, it can remain

as is since the Teflon O-rings will break-in quickly. It should be noted that there is no operational problem or

risk even if the unit develops as much as 0.5mm of free play (at your option the O-rings could be replaced or a

shim added). When the correct shim(s) has been determined, remove the dowel pin, the retaining collar, the