7-44 BA 35203_04 * 3.0 * 35203_04_07_Wartung.fm
7 Maintenance
Monitoring the hydraulic oil and the return filter
indicator light 68 on the indicating instrument monitors the return filter
(dirt).
An error code is stored if the hydraulic oil temperature is too high.
The stored error code may be accessed via the digital display
– see chapter 4 “Error memory” on page 4-44.
The control lamp 68 on the indicating instrument lights up if the oil-flow
resistance in the return filter is too high.
► The filter element is dirty and must be replaced by an authorized
service centre.
If symbol A appears in the digital display of the indicating instrument, the
operating temperature of the hydraulic oil is too high.
► Check the hydraulic oil level (not enough oil in the reservoir).
► The filter element or the hydraulic oil is dirty and must be replaced by
an authorized service centre.
If the oil temperature of the drive hydraulics is over 105°C (221°F), the
travel speed (travel dynamics) is automatically reduced by 50% until the
oil temperature is below 105°C (221°F) in order to avoid damage to the
drive hydraulics.
► Have the cause for the high oil temperature checked or repaired by an
authorized service centre under all circumsances.
In cold weather indicator light 68 can illuminate immediately when the
engine is started. This is caused by increased oil viscosity. In this case,
regulate the engine speed so that control lamp does not light up.
► Bear in mind the instructions concerning warmup –
see chapter 4 “Running-in period” on page 4-49.
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