1. Watch for the pivot and there are many at the excavator arm, look for them if they are loose;'
2. Look for the grease points if they have been greased regularly
3. Look well at the turntable bearing. It could be expensive to replace.
4. Look at the undercarriage:
1. Sloppiness of the track
2. Undercarriage bearing - are they moving well or stuck
3. Track pads: are they still thick or thin and are bent? Loose pads
4. Pins: are they worn out (like watching the bike pins)
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