OM 25-3503 us – Edition 4.1 * 2503_3503b520.fm 5-15
Maintenance
Collect drained hydraulic oil and biodegradable oil in a suitable container!
Dispose of drained oil and used filters by an ecologically safe method.
Always contact the relevant authorities or commercial establishments in
charge of oil disposal before disposing of biodegradable oil.
Checking the hydraulic oil level
Do not add oil if the oil level is above the MAX mark, otherwise the hydraulic
system can be damaged and escaping oil can cause serious injury.
• Check the hydraulic oil level each time the machine is put into operation or
once a day
☞ Proceed as follows:
•Park the machine on level ground
•Retract the bucket and boom cylinders, lower the boom and the bucket teeth
to the ground
•Lower the stabilizer blade to the ground
•Set the boom straight (swiveling cylinder)
•Release the pressure in the operating hydraulics – see chapter Releasing
pressure on page 3-88.
•Stop the engine, remove the starting key and carry it with you.
•Raise the control lever base
•Sight glass B is located in the rear left corner of the machine in the trim.
•Check the oil level on sight glass B
•The oil level must be about 1 cm (0.4 in) over the center, between positions
MIN and MAX, as shown by the arrows in fig. 279.
➥ The MIN level is marked by the lower joint
➥ The MAX level is marked by the upper joint
If the oil level is lower
•Add hydraulic oil
The oil level varies according to the machine’s operating temperature:
Information!
Measure the oil level of the hydraulic system only after the machine reaches its
operating temperature.
1
Fig. 279: Oil level indicator on the hydraulic oil reservoir
B
Fig. 279: Parking the excavator
MIN
MAX
Machine condition Temperature Oil level
• Before putting into
operation
Between 10 and 30 °C (50 – 86 °F) LOW mark
• Normal operation
Between 50 and 90 °C (122 – 194°F) FULL mark
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