GRAUPNER heim UNI-Mechanik 2000 Mode D'emploi page 54

UNI-Mechanics 2000
1.1 Assembling the tail rotor drive unit
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(bag U2-1A
There must be absolutely zero axial play in the shaft of the quick-release coupling 4618.57
within the bearings 4618.6. If the shaft is not a sufficiently tight fit in the bearings, glue it to the
inner rings using bearing retainer fluid 603, Order No. 951. This is the procedure: apply bearing
retainer fluid 603 to the inside face of the rear bearing, and press it onto the shaft until it rests
against the coupling yoke. Wait until the adhesive has hardened - this may take anything from
20 seconds to 30 minutes depending on the closeness of the fit. Push this assembly fully into
the bearing holder 4448.14 (until it stops), then apply bearing retainer fluid 603 to the front
bearing, push it onto the shaft in one movement, and press it into the bearing holder as far as it
will go. Now check immediately (before the adhesive sets) that the shaft still rotates freely; you
may find that axial stress has caused the bearings to become stiff. If so, tap lightly (e.g. using a
screwdriver handle) on the end of the shaft in the axial direction or (more strongly) on the
bearing holder until the bearings revolve freely, then leave the bearing retainer fluid to cure.
Fit a shim washer and the pinion 4448.41 on the front end of the shaft, press it against the front
bearing and secure it in this position with the grubscrew: apply a drop of thread-lock fluid (Order
No. 952) in the threaded hole and tighten the grubscrew, checking that it engages fully on the
ground flat section of the shaft. Rotate the pinion to and fro on the shaft until you find the
optimum position for the grubscrew, then tighten it fully.
1.2 Assembling the layshaft
(bag U2-1B)
Fix the bottom layshaft bearing 4448.31 on the shaft 4448.7 using bearing retainer 603, Order
No. 951. Position it resting against the pinion, then allow the adhesive to cure. Press the shaft
and bearings into the bottom bearing holder 4448.11.
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