Man D 2866 LUE 602, Repair Manual

Page: 131 / 174

Pilot clutch D 2866 LUE 602
129
Friction ring wear
If the wear limits of the friction ring at the propshaft
are exceeded vibrations in the entire unit may arise-
Service times or kilometrages when a wear check
measurement must be carried out. To this end the
relative movement between the clutch housing and
the hub or the connected propshaft flange is measu-
red with a measuring test gauge.
The procedure is as follows:
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The test gauge holder - a magnetic stand is a
good idea - is attached in a vertical plane to the
housing and the tip of the test gauge is applied to
the propshaft flange
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With a suitable lever the clutch-end link of the
propshaft is pressed down and the test gauge
aligned to zero
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The shaft is now pressed upwards and the va-
lue of the relative movement is read off. This reading should be repeated after a 90
°
twisting of the drive
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Measured values which are below the double value named in the table above the wear values for the
friction disk and friction ring are OK and experience has shown that they do not lead to a marked
change in the running smoothness
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If the limit is reached or exceeded it is a good idea to replace the friction ring. The replacement is made
in accordance with the procedure described in the general service and maintenance instructions
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It is advisable to determine the wear of the metal parts which serve as a counterpart to the friction ring
after a kilometrage of 1,200,000 km (about 24,000 service hours). The permissible tolerances corres-
pond to the dimensions in the production drawings
Note:
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The expected kilometrage of the clutch elements is about 1,200,000 km (about 24,000 service
hours)
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The friction disk and friction ring could have reached the wear limits after 600,000 km (about
12,000 service hours)