KNEGT 404G2 Series, Operation Manual

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404G2
SERIES TRACTOR OPERATION MANUAL
71
either bearing seat, the pre-stress of bearings is alternated but the crown gear position
will kept unchanged; if moving the Adjusting shim from one bearing seat to the
opposite one, the crown gear will be shifted towards the side where the Adjusting shim
is added but the pre-stress of bearings will remain unchanged. The pre-stress of the
spiral crown gear bearings should be kept between 1
～
1.5 N. m.If there is no equipment
or tool can be used to measure the torque, ask somebody who is experienced for help.
6.5.3 Adjustment of the spiral bevel pinion and spiral bevel crown gear
Because of the abrasion of the gears and bearings, the clearance increases. As a result,
the gears can not work in the correct meshing zone. There is no necessary to adjust only
when it affects the gears working normally or the bearings and the bevel gears need to
be replaced or the assemblage needs to be repaired. (The adjusting needs to be done
after the bearings have been fastened.)
（
1
）
Checking the clearance between the teeth
Make sure the clearance of the pinion and crown gears at the state-range. Only when the
clearance is large enough, it should be adjusted.When adjusting, bring down the back
seat, put a lead piece between the teeth of pinion and crown gears. The lead piece will
be pushed to transform. Then measure the thickness of lead piece near the big end. The
proper clearance changes from 0.16 to 0.32mm. Measure it for 3 times and at 3 point
which equally at the circle. The difference between them should be less than 0.1mm. If
it failed to reach the request, adjust the thickness of Shims for bearing seat 8 in fig.6-5
or Shims for main drive case 2 in fig. 6-6. At last, put all of the components on.If the
clearance is too large,you can decrease the thicknessof Shims for bearing seat 8 or
Shims for main drive case 2, but it’s important to note that you must move the Adjusting
shim from one side to the opposite side, then the crown gear will be shifted towards the
side where the Adjusting shim is added but the pre-stress of bearings will remain
unchanged.
（
2
）
Checking the meshing zone
The meshing zone can be measured by smear test, painting the crown gear teeth with
some colors such as red lead or Prussian blue,then rotate the Bevel drive pinion,get the
meshing zone.The standard meshing zone should be in the middle of all the teeth face
and deflecting to small end of teeth slightly. It’s length at least equal to 55% of the