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2.1.4 Check the track chain at the front side of the axle tracking direction. An area where the
track rollers do not contact with the pontoon body (called as Zero Contact Area (ZCA))
should occur due to track chain movement as per figure 2.2.
Figure 2.2
2.1.5 Measure the gap between the track rollers and pontoon body at the ZCA as per figure
2.3. If the biggest gap, G is between 1½ to 2½ inches, that means the track chain is in the
good tension. If that gap is more than 2½ inches, the track chain is in the slack condition
and must be tensed correctly.
Figure 2.3
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