Instruction manual

C. Select the previously assembled input shaft. Slide it into the tail rotor housing. NOTE: There are two M3

threaded holes at 180 degrees apart on the housing inlet. Install one M3x3 set screw very lightly to provide a

little friction against the input shaft spacer #0861-7. Set the desired gear mesh and tighten the set screw.

Install the remaining set screw and tighten. NOTE: If repeated installation of the set screw creates burrs on the

spacer (which can limit the fine tuning adjustment of the gear mesh), simply rotate the sleeve so that the set

screw faces a fresh surface.

D. Grease is applied through the large diameter hole in the rear of the housing. Use a suitable size syringe (MA

USA p/n #4707 or #4709 is recommended). This access hole will later be concealed by the bell crank support

arm. DO NOT ATTEMPT TO FILL THE CASE WITH GREASE since it serves no purpose. Simply

concentrate the grease application toward the gears and rotate the input shafts to get coverage. The applicator

is helpful and avoids getting grease in the threaded area (which would have to be removed to enable the

Loctite to work properly). The bell crank support #120-16 installs by keying it into the groove in the back of

the Tail Rotor Housing #0861-5, and it is secured with one M3 Socket Head Bolt #0061. Use blue Loctite.

E. Select one #0597-3 Brass Spacer, two #0159 M3x7 Ball Bearings, and one #0445 Tail Rotor Bellcrank. Press

one bearing into one side of the bellcrank. Insert one #0597-3 Brass Spacer in the opposite side followed by

another #0159 Ball Bearing. Each will protrude approx. 0.75 mm when fully inserted. Select one #0001 M2

Flat Washer, one #0015 M2 Hex Nut, one #0043 M2x10 slotted screw, and one #0361 M2 Control Ball.

Examine the drawing and note which side of the bellcrank is the top and note that there are three Control Ball

mounting holes to select from. This kit will utilize the center hole. Insert the #0043 M2x10 Slotted Screw

into the #0361 M2 Control Ball, followed by one #0001 Flat Washer. From the bottom of the bellcrank,

insert the slotted screw/control ball/washer assembly into the center hole of the bellcrank. From the top of the

bellcrank, assemble one #0015 M2 Hex Nut onto the slotted screw, using Blue Loctite. Select the previously

assembled pitch slider from Step 2 and one #0093 M3x18 Special Phillips Pivot Bolt. Slide the pitch slider

assembly onto the output shaft with its control ball pointing downward. Press this control ball into the hole

provided in the top of the tail rotor bellcrank and position the bearings of the bellcrank directly under the

mounting hole in the #120-16 Bellcrank Support. Select one M3x18 Special Phillips Bolt and insert it

through the bearings in the bellcrank from the bottom side of the bellcrank and thread into the #120-16

Bellcrank support. Adjust the tightness of this bolt until the bellcrank has no vertical free-play yet pivots

smoothly. From the opposite side of the #0093 bolt, install one #0051 M3x3 socket set screw into the #120-

16 Bellcrank support. Tighten up against the end of the pivot bolt. Use Blue Loctite. This acts as a safety,

locking the #0093 Special Phillips Bolt into position.

F. Select the previously assembled tail rotor hub assembly. Examine the drawing and note the orientation of the

hub, blade mounts and the gearbox. For further clarity, hold the hub assembly and view it as though you were

looking directly at the 5.0mm diameter through hole. Position the blade mount pointing at three and nine

o=clock positions. The correct view should show the blade holder to your left (nine o=clock position) as

having its control arm above, the blade mount to your right (three o=clock position) as having its control arm

below. Note: for future reference, considering the view you now see, the tail rotor blade for the Aleft blade

mount@ would have its leading edge pointing upward and the tail rotor blade for the Aright blade mount@ would

be pointing its leading edge downward. Slide the hub assembly onto the output shaft, aligning the M3

threaded holes in the hub with the M2 countersunk holes in the shaft. Select two #0056 M3x5 Adog-point@

Socket Set Screws. The term Adog-point@ refers to the 2.0mm diameter protrusion at the end. This will

directly engage the 2.0mm diameter holes in the output shaft. Prepare each with Blue Loctite and install into

the hub and through to the holes in the output shaft. Tighten each simultaneously a little at a time until fully

tight. Note: recheck the tightness periodically with the previously mentioned method in mind.

G. Connect the two pitch pivots #0859-16 to the hole in the arm of the T/R blade mounts using two M2x10

Socket Head Bolts #0049. Use blue Loctite on the tip of the bolt, taking care not to let any get into the

bearings. Tighten securely.