Undercarriage - most expensive.
Hi, Qadir.
Firstly, welcome to the forum. In fact, a special welcome because we don't get too many people here with Arabic/middle Eastern names or from that part of the world, which I'd guess is where you originally came from. Just a guess though.
The undercarriage is what any track-mounted vehicle or machine runs on. It includes any rollers, idlers, sprockets, track chains, rubber track belts, track frames and any suspension mechanism within the track system. Undercarriages wear at different rates in different soils or rocks and also with different operators.
Operating speed and the work being done also play a big part in how long an undercarriage or its various parts will last. Sharp turns, changes of direction, a lot of running in reverse - especially at speed - and rough ground will cause an undercarriage to wear much more quickly than it would if the tractor was used for plowing or cultivating on a farm with long straight runs in softer ground.
The three most expensive repair items on crawler tractors are engines, transmissions and tracks, not necessarily in that order, Regular checking of tracks for wear and doing the recommended maintenance at the specified wear limits can save big money in repair costs over the life of the machine.
Hope this helps.
