Aircraft Service Manual
Jabiru Aircraft
Pty Ltd
JTM001-1
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
REVISION
1
Dated: Nov 2011
Issued By: SW
Page: 100 of 233
5.
Remove upper collar / steering yoke (dependant on aircraft model) from the top of the leg.
6.
Pull the nose wheel strut assembly down from the bushes in the fuselage.
7.
To install the nose gear, reverse the preceding steps.
8.13.3 NOSE GEAR GENERAL INSPECTION
Inspect steel tube and attachments for dents and straightness.
Inspect rubber spring assembly for damage or perishing of the rubber, or de-lamination of the rubber
from the metal spacers between the rubber blocks. Check that the washer has been fitted at the top
of the rubbers.
Inspect aluminium wheel yoke for damage or bending.
Inspect pivot bushes for wear or damage.
Inspect assembly bolts & hardware
– replace if damaged or corroded.
Inspect bolts/nuts for torque
– see “thick lamination” torque values in Table 1.
Repairs to the welded nose leg assembly beam must be referred to Jabiru Aircraft Pty Ltd or our
approved local agent.
8.13.4 NOSE GEAR END FLOAT ADJUSTMENT
If the end float of the leg in the housing requires adjustment, use the procedure below. Note that this
applies regardless of the type of nose leg housing fitted to the aircraft:
1.
The nose leg retaining collar is drilled with 3 sets of holes, each at a slightly different position.
Depending which holes are used the distance between the upper and lower retaining collars
can be increased or reduced to allow for wear.
2.
If there is excess float adjust 1 collar to the next-smallest position. If this is then too tight to fit
onto the housing use a sanding block to remove a small amount of material from the top of the
Ertalyte bush to allow a proper fit.
3.
If no smaller adjustments remain then the Ertalyte bushes must be replaced.
8.13.5 NOSE GEAR BUSH REPLACEMENT
To replace the Ertalyte bush(es):
1.
This task can be done with the housing mounted on the fuselage
– removal is not necessary.
2.
Adjust the retaining collar(s) of the leg assembly to their largest setting.
3.
The new bushes will be bonded in place while installed on the nose leg. Therefore it is
necessary to apply a light coating of grease or wax to all parts which should not be bonded to
the housing.
4.
Break the existing bushes out of the housing, taking care not to scratch or damage the housing
itself.
5.
Remove any leftover flock.
6.
Dry fit the replacement bushes to the leg. If they are too tight they may be reamed slightly to fit
- however a
slightly “firm” fit is preferable during initial assembly to ensure a good fit once the
initial wear-in is complete. Graphite lubricant may be used.
7.
Lightly sand the bonding surfaces of the nose leg housing and the new bushes using 240 grit
(or higher) paper.
8.
Wipe the sanded areas with a rag moistened with acetone to remove any oils and excess dust
from the surfaces.
9.
Very lightly sand the boding surfaces again and blow off dust using dry air.
10.
Paint bonding surfaces lightly with epoxy resin mixture.
11.
Mix cot
ton fibre flock with epoxy resin to a “gluey” consistency similar to toothpaste.
12.
Assemble the bushes to the leg housing and fit the leg. Place a jack or similar under the leg
assembly so that the weight of the leg is not pulling down on the wet resin.
13.
Ensure there is a thick flock bed around the part as shown in Figure 66 (left).
14.
It is good practice to paint the flock with resin before it cures
– this gives a smooth, shiny finish
to the flock bed.
