Maintenance and Installation Instructions Edition 11.07.2006 25 of 30
Initial Operation / Maintenance
If the units are not delivered with filled oil, fill in the transmission oil before
the initial operation!
Oil grade for transmission types GK 20, GK 25, GK 30
Approved are only oils which fulfill the below specifications:
• Classification to API-GL5
• Classification to MIL-L-2105C/D, test method A (score test), test method C (endurance wear test)
• ZF List of Lubricants TE-ML 17, Lubricant class 17B
Oil grade for transmission type GK 40
Approved are only oils which fulfill the below specifications:
• Classification to API-GL4 or API-GL5
• Classification to MIL-L-2105 or MIL-L-2105 C/D
• ZF List of Lubricants TE-ML 17, Lubricant class 17A and 17B
Detailed data to the oils grades is found in the Internet under the below mentioned address:
www.zf.com / Products for / Techn.Information / List of Lubricants
The use of alternative oil grades requires the written approval by ZF Gotha GmbH.
ZF units are designed up to -30°C. ZF cannot give any warranty for an operation
below -30°C.
In general the components are not damaged in cold store operation at temperatures
to -40°C as these mostly only occur for a short time after vehicle start-up. For critical
single cases independent tests by the vehicle manufacturer are recommended!
Oil capacity
Total transmission oil quantity GK 20 2.2 liters
Total transmission oil quantity GK 25 3.3 liters
Total transmission oil quantity GK 30 4.6 liters
Total transmission oil quantity GK 40 7.0 liters
The oil quantities are approximate values and serve as guide only.
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