997
Model Code Page
65. Industrial front axle
1. 1. 1994
6000--8750 651 3
Note! Here is presented shortly the repair instructions for the
industrial front axle. If the instructions are the same as for the
standard axle, necessary refers are given.
1. Hubs, drive shafts and king p ins
(see fig. 2 on previous page)
A. Central pivot bearing brackets
See page 641/1.
Oil volume in the hubs is 2x1,5 litres.
B. Drive shaft seals and double joints
The drive shaft outer seal is changed as shown on page
642/1. The king pins can be removed with extractor shownon
page 640/3 but the king pins have thread M12. The king pin
cover bolt tightening torque is 190 Nm.
The outer diameter of the drive shaft outer seal is 95 mm.
The ring gear support tightening torque is 120 Nm.Whenyou
remove the ring gear support flange, at the same release also
shims for adjusting the wheel bearing pre---load. The shims
should be fitted back when reassembli ng the hub.
The drive shaft inner seal is changed as described in instr. B
on page 642/3. The seal outer diameter is 80 mm. The seal
has also a wear ring. Apply Loctite 290 under t he wear ring,
if removed.
Reconditio ning double joints , see page 642/3 instr. C.
C. Hubs
The planetary gear bearings are changed as shown on page
643/1. The hub big seal can be fitted with locally prepared tool
ET 894 020.
Adjusting wheel bearing preload:
--- oil new bearings. Fit the wheel attaching flange and the
bearings into place. Fit the ring gear support and tighten the
bolt s (2) so that the bearings have a small play, so that the hub
rolling resistance can be measured without bearing preload.
Before measurement, rotate the hub many times into both
directions.
--- attach a spring balance wire to the wheel attaching bolt and
measure the hub rolling resistance without preload, e.g.
F=6,5 kg.
--- Then tighten the ring gear support flange bolts to 120 Nm
and measure again the rolling resistance, e. g. F=11 kg.Sub-
tract this from the previous value:
11 kg---6,5 kg=4,5 kg
Thepreloadvalueshouldbebetween3,6---4,7 kg.
The preload is adjusted with shims which are fitted between
the ring gear support and the hub.
Note! Thesameshimscanbeusedoften,becausethebear-
ings are precision---machined.
D. Changing king pin bearings
See instr. C on page 643/3.
Adjust the king pin bearings as follows:
--- Ensure that the lower king pin with its bearing and cover is
fitted in place. Tighten the lower pin cover bolts to a correct
torque.
--- Fit the upper king pin together with its bearing into place
and press with a suitable plate and bolt the upper king pin/
bearing into its location until the bearings have no play.
--- Measure with a depth gauge how deep the upper king pin
was pressed, measurement M e.g. 0,8 mm
--- The king pin bearings need a preload of 0,5 mm.Theshim
thickness S whichmustbefittedontheupperpincanbe
calculated as follows:
S=M+0,5
E.g. 0,8+0,5 mm=1,3 mm.
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