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Tracker Drive Mechanism - See Figure 5.2
If the Steps per Revolution test returns an erratic result, or a variance that is more than about 20
steps, then the large aluminum drive wheel and the small stainless steel drive rod should be
inspected and cleaned with a dry tissue.
If no slippage is observed in the SR, then the cleaning should be done approximately every 3
months.
If Tracker slippage is not due to dirty drive gears, then drive gear tensions should be checked.
The friction drive arm is set with 9 kg of tension on the lower spring and 4 kg on the upper spring to
provide drive friction and gear mesh pressures respectively.
Figure 5.2. Tracker Drive Mechanism
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MKIII OPERATOR'S MANUAL
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