Maintenance work on the carrier
7.13 Hydraulic system
03.11.2017
Maintenance manual 3 302 574 en 7 - 91
GMK3060
Dispatch the oil
sample to the
laboratory
Manitowoc Crane Care gives you the opportunity to have the oil sample
analysed at our contracted laboratory. A delivery note and a protective
mailing bag are available along with the sample containers (GROVE part
no. 03141012). You will get the laboratory analysis via the Internet in a
short time.
• Label the sample container prior to dispatch with
– the truck crane serial number,
– date of sample,
– the number of operating hours since the last oil change and
– the sampling location (e.g. gauge port on a control block).
• Have the following properties of the oil sample determined by the
laboratory
– the viscosity,
– the viscosity index,
– the contamination,
– the water content.
Determining the
condition of the oil
• Compare the laboratory analysis with the limit values and carry out the
specified measures if necessary.
Viscosity limit values
– Viscosity ISO-VG 32 as per DIN 51524 Part 2.
– Viscosity index V
i
 150.
If one of these limit values has been reached/fallen short of:
• Carry out an oil change; à p. 7 - 93.
Contamination limit value
– Contamination as per NAS 1638 Class 7 or ISO 4406:1999
Code 18/16/13 (purity class).
If this limit value has been reached/exceeded:
• Replace the filters of the hydraulic system; à p. 7 - 98.
• Have the hydraulic oil cleaned with a mobile filter unit until the required
cleanliness class is achieved.
Water content limit value
– Water content  100 ppm.
If this limit value has been reached/exceeded:
• Have the hydraulic oil cleaned with a mobile water separator until the
water content is clearly below the limit value.
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