IBM 4247-003 Maintenance Manual - Page 325
Tractor Assembly Service Check, Platen Gear and Bellcrank
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Platen Gear Bellcrank Figure 78. Platen Gear and Bellcrank 4. If this operation fails, inspect the pinch roller parts. Repair as needed. See "Platen Pinch Roller Assembly" on page 411 . Tractor Assembly Service Check If there is a second tractor, it may be swapped for diagnostics. The tractor assembly can be used for front push, or for rear push and rear pull configurations. To do this a drive gear in the tractor assembly is placed in one of two positions by a motor. It is not necessary to remove the tractor end cover. The next figure shows a tractor assembly installed in the front push position with the gear in the drive position. The tractor assembly idler gear is not used in the front push position. The printer front tractor drive gear is driven by the paper feed motor through a drive belt. Chapter 5. Removals and Adjustments 325
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