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Jabiru J450 Constructors Manual
Pre-Paint>Fuselage>Undercarriage>Assemble main gear
Tuesday, April 6, 2010
38 of 343
Assemble the brake and wheel
Firstly and very importantly place the alloy washer
(#6A028B0D on the „
Main wheels
‟ card) on the stub axle
with the tapered inner side
towards
the gear leg and
away
from the wheel – this washer (circled at right) provides a
square surface for the inner wheel bearing to butt up to.
Now we can fit the appropriate wheel (left or right) to each
gear leg and then fit the brake system.
Fit the wheel to the stub axle and secure with the axle extension, fitting an AN3-12A bolt
though the extension and the axle from the top with a lock nut on the bottom.
Take the U channel backing plates and the
steel lock nuts. Fit a bolt through the
backing plate from the pad side and into the
nut and very carefully apply a drop of
Superglue to 2 opposite flats of the steel
lock nut and then pull the steel lock nut
back into the U channel as shown arrowed
at right to glue the nut into the U channel:
Take care not to glue the bolt into the nut!
Look carefully at the drawing on the
previous page to see how the brake assembly fits together.
As you can see from the drawing the outer pad goes on the outside of the wheel disc, while
the inner pad goes between the wheel disc and the inner mounting plate and the hydraulic
caliper goes behind or inboard of the inner mounting plate.
2 x AN4-14A main bolts, each with a washer, secure the whole assembly and each bolt has a
spring that is fitted over the bolt and which holds the brake pads apart. In the factory we fit
the top bolt first with no spring in order to get the correct alignment and then fit the bottom
bolt and spring, then go back to the top bolt and fit the spring.
The calipers must be fitted as a pair, with the top fittings and the bottom bleed nipples turned
slightly towards each other as shown below.
Pull bolt back this way
Glue nut
in here