Maintenance
123
Checking the crawler tension (steel)
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Check the crawler sag as shown in the figure.
Crawler sag "A"
75-80 mm
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If the crawler sag is more than 80 mm, adjust the crawler.
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If necessary, tighten or loosen the crawler.
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Start the excavator and rotate the crawler briefly.
Caution: The area around the rotating crawler must be free of persons. Turn the starter switch to
the STOP position after turning and remove the key switch.
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Recheck the crawler tension, readjusting it if necessary.
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Perform the procedures on the second crawler.
Replace the drive unit oil
Only change the oil when the drive unit is warm to the hand; if not, drive the excavator warm.
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Park the excavator on level ground so that the drain plug (figure below, position 2) is positioned at the
bottom.
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Place a catch tray with a minimum capacity of 2 L under the drain plug.
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Remove the drain plug and let the oil drain completely.
Install the drain plug with a new sealing ring on it.
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Remove the oil filler plug (1).
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Fill oil as specified in the "Recommended lubricants" section
(page 127). The oil level is the lower edge of the thread.
Capacity:
0.6 L
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Refit the oil filler plug with a new sealing ring and tighten it.
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Perform the same service on the second drive unit.
