elektro
Skalar
26
4. Assembling the tail rotor gearbox
(bag UM-11, 11A)
Fit the bevel gear 4618.38 on the tail rotor shaft 1221, as shown in the drawing. Apply thread-
lock fluid to the threaded holes in the bevel gear, then tighten the M3 x 3 grubscrews; note that
one of the two grubscrews must engage squarely on the machined flat in the tail rotor shaft.
Don’t over-tighten the grubscrews - the bevel gear could then be forced out of shape and run out
of true. Fit the spacer sleeve 4450.28 and the ballraces 4618.69 and 4450.22 on the tail rotor
shaft, pushing them hard up against each other. Push this assembly into the tail rotor housing
4448.73 as far as it will go, and secure it with the M2 x 4 retaining screw. Check that there is
absolutely zero axial play in the shaft; fit 5/10 x 0.1 mm shim washers to take up any slack if
necessary. Dismantle the assembly again, apply bearing retainer fluid, Order No. 951, to the
bearings and slide them into place. Assemble all the parts again permanently.
Fit the ballraces 4618.69 and the spacer 4618.66 on the tail rotor input shaft 4448.40 as shown
in the illustration. Apply bearing retainer fluid, Order No. 951, before fitting the bearings.
The bearings must not be under stress; if necessary tap on them using a screwdriver handle or
similar, so that they automatically seat correctly on the shaft. Allow the bearing retainer fluid to
dry.
Fit a 5/10x0.1shim washer and a bevel gear 4618.38 on the tail rotor input shaft 4448.40 as
shown in the illustration without using bearing retainer fluid at this stage.
Fit and tighten the M3 x 3 grubscrews in the bevel gear. Note that one of the two grubscrews
must engage squarely on the machined flat in the tail rotor input shaft.
Now fit the prepared drive shaft assembly into the tail rotor housing, and line up the hole in the
spacer 4618.66 with the hole in the tail rotor housing, then secure it with an M2 x 5 countersunk
screw.
Fit a steel rod (screwdriver blade or similar) through the threaded holes in the coupling 4448.40.
Using the rod as a handle, pull hard on the coupling (against the countersunk screw joint), so
Summary of Contents for Skalar
Page 13: ...elektro Skalar 13...
Page 44: ...elektro Skalar 44 Notes...
Page 46: ...elektro Skalar 2 Main gearbox...
Page 48: ...elektro Skalar 4 Sub structure...
Page 50: ...elektro Skalar 6 Motor...
Page 52: ...elektro Skalar 8 Main rotor...
Page 54: ...elektro Skalar 10 Tail rotor...
Page 56: ...elektro Skalar 12 Tail boom...
Page 58: ...elektro Skalar 14 Cabin stabilisers landing gear...