59405600 – Gravely ProStance 48–60″ PTO Idler Assembly (OEM-Spec)
The Gravely 59405600 ProStance 48–60″ PTO Idler Assembly is a genuine OEM-spec replacement component engineered to maintain accurate belt tension and efficient power transfer in the PTO (Power Take-Off) system of Gravely ProStance commercial stand-on mowers. Built to Gravely’s rigorous standards for durability and performance, this idler assembly supports smooth engagement and reliable operation of the PTO belt across 48″ to 60″ cutting decks. Designed for heavy-duty professional use, the 59405600 assembly helps ensure consistent deck engagement, reduced belt slippage, and long service life under tough mowing conditions.
Product Details
Manufacturer Part Number: 59405600
Brand: Gravely (OEM-Spec)
Part Type: PTO Idler Assembly
Function: Maintains PTO belt tension and supports proper belt routing
Application: Gravely ProStance stand-on commercial mowers with 48–60″ decks
System Location: PTO/deck engagement belt drive
Assembly Style: Idler pulley with mounting bracket and hardware
Material: OEM-grade steel pulley and bracket with sealed bearing
OEM Status: Genuine Gravely replacement
Function
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Maintains proper tension on the PTO/deck engagement belt
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Promotes smooth power transfer to the mower cutting decks
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Helps prevent belt slippage, misalignment, and premature wear
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Stabilizes belt routing for consistent deck engagement under load
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Supports reliable deck lift and PTO engagement responsiveness
Compatible With
The Gravely 59405600 PTO Idler Assembly fits select Gravely ProStance stand-on mower models equipped with 48″, 52″, or 60″ cutting decks and PTO belt drive systems, including:
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Gravely ProStance commercial stand-on mowers with 48–60″ deck PTO configurations
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Units listed in Gravely parts diagrams specifying part number 59405600
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Deck systems requiring an OEM-spec idler assembly for proper belt tension and alignment
Always verify compatibility with your machine’s model and serial number using the official Gravely parts manual before ordering.
How It’s Used
This PTO idler assembly installs in the deck drive belt path to manage tension and ensure correct routing:
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Safety First: Turn off the mower, remove the key, and disconnect the battery or spark plug before servicing.
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Access Belt Path: Raise the deck and remove any necessary guards, shields, or covers to access the PTO belt and idler location.
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Relieve Tension: Relieve belt tension and carefully remove the belt from the existing PTO idler assembly.
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Remove Old Assembly: Unbolt and remove the worn or damaged idler assembly, noting bracket orientation.
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Install New Assembly: Position the Gravely 59405600 PTO Idler Assembly in the correct orientation and secure mounting hardware to OEM torque specifications.
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Re-route Belt: Reinstall the belt, ensuring proper routing around all pulleys and correct tension.
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Test Operation: Reinstall shields, reconnect the battery, and test PTO engagement and deck function for smooth operation.
Proper installation and routing help secure dependable PTO belt performance and extend belt and pulley life.
Suggested Maintenance
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Periodically inspect the idler pulley and bearing for noise or play
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Check PMS belt routing and tension at regular intervals
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Remove debris buildup around the idler and belt area
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Replace the idler assembly if bearing wear, groove wear, or misalignment is detected
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Inspect PTO belts and replace worn belts during idler service
The Gravely 59405600 ProStance 48–60″ PTO Idler Assembly is a rugged, OEM-spec solution designed to keep your mower’s PTO belt system operating smoothly and reliably—ensuring proper belt tension, responsive deck engagement, and extended component life in demanding commercial mowing applications.