404G2 SERIES TRACTOR OPERATION MANUAL
69
The meshing zone can be measured by smear test of
painting the crown gear teeth with some colors such
as red lead or Prussian blue. The standard meshing
zone should drift to small end slightly (i.e. short toe
contact, see Fig. 6-4). The meshing zone position
could be alternated through adding or deducting the
adjusting shims of the spiral-bevel pinion and the
mated spirl crown gear as well. The print on crown gear shall be taken for evaluation,
no matter the print is on convex surface or concave surface. After having made the
adjustment, the gear backlash should range from 0.15～0.30 mm.
In order to ensure the reliable of the main drive, the spiral bevel pinion and the spiral
crown gear should be a matched pair when assembling, at the same time, they should be
adjusted correctly to approach the right meshing zone. The position must be adjusted
when the gears or the bearings are abraded.
If chippings from the pinion teeth surface of final drive are found after
disassembling the rear axle, then the pinions of left final drive gears and right one
should be exchanged, which may prolong their service life.
6.5 Adjustment of the Front Axle (4WD)
To insure the reliability of the front axle bevel transmission, assembled pinion and
crown gears(see fig 6-5 and 6-6) should be a pair of match. And they should get to the
proper mashing zone. During the usage, the gears must be adjusted when the bearings
and gears abraded .
6.5.1Adjustment of the prestress of the spiralbevelpinionbearings（See
Fig。65）
The two bearings 5 and 7 on the Bevel drive pinion should be pre-stressed.The pressure
is adjusted by screw the Locking nut 1.It has been adjusted to the proper pressure by the
factory,and will not be adjusted again only when the bearings 5 and 7are changed or this
part needs a repair.When adjusting, remove the split pin,screw down the Locking nut 1,
the torque to be applied for turning the Bevel drive pinion should be kept between 1～
Fig.6-4
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