Komatsu PC45MR-5 PC50MR-5 PC55MR-5 Final Drive 22N-60-51300 FU1BB25159640A Mini Excavator Travel Motor

Heavy 6300 N·m Torque & 12-Bolt 230mm Sprocket Fitment for 5.0–6.0T Komatsu Earthmovers. Direct OEM replacement dual-displacement hydraulic travel motor complete with 47.5:1 planetary reduction gearbox, engineered specifically for 12-hole sprocket Komatsu PC45MR-5, PC50MR-5, and PC55MR-5 mini excavators.

(Authority verified via Komatsu EPC parts catalogs & compact hydraulic databases)

(Precision measurements for Komatsu MR-5 reinforced 12-bolt track frames)

Dealing with sprocket bolt mismatch when replacing drives, or noticing track lag when tramming under load? Modern Komatsu Dash-5 (MR-5) excavators upgraded their drive sprocket interface to a 12-hole M14 bolt circle (230 mm pilot) to distribute heavy 6300 N·m tractive torque. Installing older 9-hole drives (such as 22M-60-32501) creates severe bolt misalignment. Over extended duty at 24.5 MPa, internal pressure bleed across the 34 mL/r displacement control piston causes sluggish two-speed shifting, preventing the motor from delivering its full 6300 N·m low-gear breakout force. Installing our precision-machined 22N-60-51300 final drive guarantees 100% 12-bolt alignment, solid M14 clamping security, and full hydraulic climbing traction.

Q: How do I verify my Komatsu requires this 12-hole sprocket drive rather than the older 9-hole version? A: Count the mounting bolt holes on your drive sprocket. If your machine is a Dash-5 model (PC45MR-5, PC50MR-5, PC55MR-5) featuring 12 sprocket bolt holes (φ14 mm) and a 230 mm inner pilot register, it requires this heavy-duty 22N-60-51300 unit. (Older MR-3 models typically use 9 sprocket holes).

Q: What is the mandatory startup lubrication protocol for this replacement drive? A: Pre-fill the hydraulic motor casing with fresh ISO VG 46 fluid through the upper casing drain plug. Separately, fill the planetary gearbox with SAE 80W-90 extreme-pressure gear lubricant up to the horizontal oil level check plug before starting the engine.

Q: How does 22N-60-51300 cross-reference with FU1BB25159640A across Dash-5 models? A: 22N-60-51300 (Komatsu OEM) and FU1BB25159640A (Manufacturer Stamping) are factory-identical designations specified across all PC45MR-5 through PC55MR-5 models, sharing identical 12-hole 230 mm sprocket registers and 47.5:1 reduction ratios for single-SKU inventory consolidation.

Q: What is the export packaging standard for overseas freight? A: Each drive unit is internally treated with rust-inhibiting transit fluid, sealed inside heavy-gauge vapor corrosion inhibitor (VCI) poly barrier wrap, and bolted securely inside an ISPM-15 certified fumigated export wooden crate built for container and air cargo handling.