1 Drain the coolant by connecting quick-fit coupling 99 301 to the bottom of the
radiator. Remove the radiator cap to make the coolant drain faster.
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2 Put the retarder lever in position 5 and
switch on the ignition. This empties out
most of the oil volume from the
accumulator so that all the oil ends up in the retarder sump.
3 Remove the oil plug 1 under the planetary gear section and drain the oil.
4 Disconnect the hoses from the retarder.
5 Remove the oil filter 2.
6 Detach the hose 3 from the oil accumulator.
7 Blow out any remaining oil using compressed air at connection 4.