Bomag BT 60/4 Operating Instructions, Maintenance Instructions page 53

Maintenance every year
Fig. 69
Stand the tamper on its foot and secure it
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against tipping over.
Clean the filler plug (Fig. 69) and unscrew it.
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Fill in new oil.
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Screw the filler plug back in with a new seal
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ring.
Fig. 70
Clean the inspection glass (Fig. 70) and check
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the oil level.
The oil must be visible in the inspection glass,
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if necessary fill in oil accordingly.
54 BOMAG BT 60/4, BT 65/4