999
Model Code Page
65. Industrial front axle
1. 1. 1994
6000--8750 651 5
2. Bevel pinion shaft and differential
(Seepicture3onthepreviouspage)
A. Bevel pinion shaft seal
The seal can be changed without removing the front axle, see
page 644/1 instruction A.
B. Changing differential friction discs
See instruction B on page 644/1.
It is best to change both disc packs at the same time. The disc
pack thickness should be between 14,51---14,69 mm.The
differential has four pinions.
C. Changing bevel pinion shaft and crown
wheel
See instruction 2 on page 644/2. Various adjustments are
shown below.
Adjusting bevel pinion shaft position
Note! Working procedure is the same as on the standard axle,
see page 644/3.
--- read off value E which is stamped on the end of the pinion
shaft (e.g. 114 mm).
--- see the bigger value marked in the axle housing (inside the
longer axle section), measurement C (e.g. 152,00)
--- measure the thickness of the inner bearing (lar gerbearing),
measurement H (e.g. 36,50)
--- calculate the number of shims required for correct pinion
shaft position:
S = C --- ( H + E )
E.g. 152,00---(36,50+114) = 1,5 mm
--- put the shims required under the inner bearing outer race
and fit the outer rac e against the shims.
Adjustment of pinion shaft bearing preload.
Note! Same as for the standard axle, see page 644/4.
--- fit the pinion shaft together with its bearings.
--- fit the circlip in front of the outer bearing.
--- fit the drive flange onto the shaft but do not fit yet the seal.
--- fit the same shims as earlier. Fit a ring in front of the shims
and tighten the shaft nut to 250 Nm.
--- use a spring balance to measure the force needed to rotate
the pinion shaft (see picture on page 644/4), Ø 60 m
--- the rolling resistance should be 3 --- 5 k g .
--- if the rolling resistance is not correct the number of shims
under the nut must be adjusted. If the rolling resistance is too
great, more shims are required and vice versa.
--- when the rolling resistance is correct the seals can be fitted.
Adjusting differential bearing preload and
pinion/crown wheel tooth backlash
The working procedure is the same as on the standard axle,
see page 644/5.
--- Using a vernier caliper, measure the distance between the
differential bearings, see picture on page 644/5,measure-
ment D e.g. 226,50.
--- R e a d o f f me a s u re m e n t A (l arger figure) marked inside the
longer axle housing. This is the distance between the bottom
of the differential bearing location and the axle housing flange
surface (e.g. 141,20 mm).
--- R e a d o f f m e a s ur e m en t B marked inside the shorter axle
housing. This is the distance between the bottom of the bear-
ing housing and the axle housing flange surface (e.g. 87,20
mm).
--- T he p re l oa d (P) of the differential bearings should be 0, 05
mm. Calculate the number of shims required as foll ows:
S = ( A + B ) --- D + P
E.g. (141,20+87,20)---226,50+0,05=1,95 mm.
--- Fit an equal number o f shims under each differential bear-
ing. Fit the differential into the axle housing and connect the
axle sections with several screws (190 Nm).
--- Measure the pinion/cr own wheel tooth backlash using an
indicatorgauge stylus against a screw on the drive flange, see
picture on page 644/6.
--- the correct tooth backlash value is 0,20---0,25 mm.
--- If the backlash is not correct transfer shims from one bear-
ing race to the other.
N.B. If the backlash is too small transfer shims from the
shorter axle section side to the longer side and vice versa.
--- when the backlash is correctly adjusted, reassemble the
axle, see page 644/7.
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