Royal Enfield Z-Drive 130, Service Manual And Parts List

Page: 17 / 29

17
7. CHECKING FOR BACKLASH
Re-fit into bearings in bearing housing top bevel gear
(220). Slip gear (221) into bearings at the top of the
housing. With two joints (178) offer the bevel gear
housing with the gear up to the body. Check as
follows:
(F,) When looking at the inner faces of the gear, not
the teeth, ensuring that the edges of the teeth
are in line with the edges of the teeth of the
mating gear.
(b) When a clock gauge is mounted with its stylus
on the pitch circle diameter, the other gear being
held, the reading given should be 0.008 in. -
0.312 in. (min. to use).
To correct for (a) :-
It is unlikely with minimum shimming to start with
that either gear will be too high, so the first step
is to observe which gear has teeth whose faces
are behind those of mating gear. The gear that
has such teeth requires
additional shimming.
To correct for (b) :
However, when faces are in line, backlash may
not be correct. I f it is too much, additional
shimming will be necessary on
both gears.
If it is too little, shimming has to be taken away
from both gears. On vertical gear (221) shim is
put between gear and ball bearing. For top input
gear (220)
shimming is done by using extra joints (178)
On ahead and astern gears (238) on propeller
shaft assembly, adjustment is made by fitting
different thickness of thrust washer (236).
When backlash is correct, the assembly may
continue:
Slip vertical bevel gear (221) on vertical
driveshaft (223). Re-fit washer (225) and
setscrew (226).
Holding hose clip (189) loosely over gaiter (190)
put gaiter over spigot provided on the body (180)
and tighten clip to seal.
Using soft-faced mallet, tap constant velocity
joint (227) through ball bearing (22) until
shoulder of joint is hard against bearing. Fit
retaining circlip (203) into groove on shaft. The
assembly of parts in bearing housing may be
re-fitted and held in place with six screws (40)
and washers (179). Top cover (167) with gasket
(170) is fitted back into place and fixed with
screws (171).