59405500 – Gravely ProStance Ground Drive Idler Pulley (OEM-Spec) The Gravely 59405500 ProStance Ground Drive Idler Pulley is a genuine OEM-spec replacement component engineered to maintain proper belt tension and smooth ground drive operation on Gravely ProStance commercial stand-on mowers. Designed to meet Gravely’s standards for durability, alignment, and long-term performance, this idler pulley plays a critical role in supporting consistent traction drive engagement. Built for demanding professional mowing environments, the 59405500 ensures reliable belt tracking, reduced slippage, and dependable power transfer to the drive system. Product Details Manufacturer Part Number: 59405500 Brand: Gravely (OEM-Spec) Part Type: Ground Drive Idler Pulley Function: Maintains belt tension and supports ground drive belt routing Application: Gravely ProStance commercial stand-on mowers System Location: Ground drive belt / traction drive assembly Pulley Design: Idler/tensioner-style pulley for belt engagement support Material: Heavy-duty steel or composite pulley construction (OEM-grade) OEM Status: Genuine Gravely replacement part Function Maintains proper tension on the ground drive belt for consistent traction performance Helps ensure smooth engagement and disengagement of the drive system Reduces belt slippage, vibration, and uneven belt wear Supports correct belt tracking and alignment under load Essential for reliable ground speed control and drive response Compatible With The Gravely 59405500 Ground Drive Idler Pulley is used on select Gravely ProStance stand-on mower models, including: Gravely ProStance commercial stand-on mowers with ground drive belt tensioner systems Units specified in Gravely parts diagrams using part number 59405500 Traction drive assemblies requiring an OEM-spec idler pulley for proper belt routing Always confirm compatibility with your mower’s exact model and serial number using the official Gravely parts manual before ordering. How It’s Used This idler pulley is installed in the ground drive belt system to maintain belt tension and ensure smooth traction operation: Shut off the mower, remove the key, and disconnect the spark plug or battery before servicing. Access the ground drive belt area by removing necessary shields or covers. Relieve belt tension and remove the belt from the existing idler pulley. Unbolt and remove the worn or damaged idler pulley assembly. Install the Gravely 59405500 pulley in the correct position and torque hardware to OEM specifications. Re-route the belt properly and restore correct belt tension. Reinstall covers and test mower drive engagement for smooth operation. Proper installation helps ensure dependable traction drive performance and extended belt life. Suggested Maintenance Inspect idler pulley regularly for bearing noise, wobble, or wear Check belt routing and tension to prevent premature pulley failure Keep debris and grass buildup away from the drive system components Replace the pulley if grooves wear down or bearings seize Monitor belt condition and replace worn belts alongside pulley service The Gravely 59405500 ProStance Ground Drive Idler Pulley is a dependable OEM-spec replacement designed to keep your mower’s traction drive system operating smoothly, with proper belt tension, reliable engagement, and long service life in commercial mowing conditions.
