Hewland FTR - General Notes and Lubrication; Bearing Replacement and Oil Filling

PAGE 8 © Copyright Hewland Engineering Limited 2001-2008
GENERAL NOTES :-
a Read these instructions carefully and with reference to the illustrations.
b Before dismantling the gearbox, see that a clean tray is available, in which to place the parts.
c Thoroughly clean and inspect all parts before reassembly. Discard any worn or damaged components and replace
with new ones.
d Use only genuine Hewland parts as replacements. These are manufactured in our workshops to the fine tolerances
necessary and are rigorously inspected.
e Always ensure that locknuts, and oil seals are in good condition when reassembling.
f All studs and screws must be Loctited or wirelocked in position, unless stated otherwise.
g Bearing Replacement :-
Bearings can only be removed or renewed if the casings have been warmed in an oven, or with a blowlamp. In the
latter case, keep the blowlamp moving while heating the casing.
Note: Do not overheat. Test with a spot of water which will bounce off at the correct temperature.
Once a casing is heated, all bearings should be pressed into their respective seatings without delay, thus eliminating
the need to reheat. At the correct temperature, fitting the bearings should present no difficulty.
During cooling, or when the casings have cooled, it is advisable to once more lightly press the bearings to ensure
that they are correctly seated. Removal of the existing bearing outer races from the maincase and sideplate can
be achieved by locally heating the area of the casings around the bearing outer races with a blowlamp, as above.
Light mallet blows around this area will cause the bearing outer to drop away from its location face, it can now be
tapped from behind it to remove it.
Care must be taken not to damage the shims and spacer located under the race face.
h Oil:
Fill the gearbox through the plug hole on top of the bearing carrier. The oil will find it's own level within the gearbox.
Note: Too much oil will not directly cause any harm, but is undesirable as it may induce power loss and overheating
of internals.