MAINTENANCE
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9.10.4 Oil Sampling
Every 250 operating hours or monthly, take an oil sample from the main and planetary
gears and inspect it:
Inspect the oil for dark or black colouring.
If the colour of the sampled oil is dark or black, the operating temperature of the oil
has been above 100°C (212°F). This makes gear oil wear out prematurely and lose
the lubricating effect so that the oil change intervals must be shortened correspon-
dingly.
Inspect the oil for water and dirt.
If the oil is found to be contaminated or water has intruded, the seal rings must be
checked and replaced as necessary.
Inspect the oil for solid particles (abrasives).
The maximum permissible amount of foreign particles in the total oil fill of one gear-
box must not exceed 0.15 %. Particles found in the oil must not exceed 5
m in size
(as measured in compliance with DIN 51592); if they do
– no matter the amount –
the rotary drive will have to be removed and taken apart.