Step 1: Understanding the function of a Pitman
The Pitman is the connecting rod in a conventional mower that transmits the reciprocating motion from the crankshaft to the cutter bar.
Step 2: Understanding why other options are incorrect
- Ledger Plate: A part of the sickle bar used for cutting, not for transmitting motion.
- Wearing Plate: A protective plate that reduces friction between moving parts.
- Grass Board: Guides cut grass away from uncut areas, does not transmit motion.
Step 3: Conclusion
Since the Pitman is responsible for transmitting reciprocating motion, it is the correct answer.