Spindle Assembly 107-8504 / 285-881 Kit for Toro Z Master 60-Inch Deck

Overview

This aftermarket 107-8504 / 285-881 spindle assembly kit is a replacement-style mower deck repair package for select Toro Z Master 60-inch mower deck applications.

This listing is organized around the 107-8504 spindle assembly path. Match your original spindle number, pulley number, blade number, idler pulley number, before ordering.

Key Features

• Aftermarket replacement-style mower deck spindle repair package
• Product Type: Spindle Assembly
• Lead Spindle Number: 107-8504
• Aftermarket Cross-Reference: Stens 285-881
• Primary Spindle Pulley Path: 105-7734 / 13639
• Primary Blade Path: 105-7718 / 105-7718-03
• Related Idler Pulley References: 109-8590, 212824144, 136-5404
• Common Deck Reference: 60 inch
• Supplier Model Reference: Toro 74915
• Organized by spindle, pulley, blade, and idler part type to reduce fitment confusion

Compatible Brands & Model Series

This 107-8504 / 285-881 spindle assembly kit is associated with select Toro Z Master mower deck applications using the listed spindle, pulley, blade, and idler paths.

Supplier model references include:

• Toro 74915, Z Master 60-inch deck reference
• Toro Z Master 60-inch deck applications using spindle number 107-8504
• Toro Z Master / GrandStand mower deck applications where the original spindle number matches 107-8504 or aftermarket cross-reference 285-881

Verify your part numbers before ordering.

Replaces OEM Part Numbers

• Toro Spindle Assembly Number: 107-8504
• Stens Spindle Cross-Reference: 285-881
• Primary Spindle Pulley Numbers: 105-7734, 13639
• Primary Blade Numbers: 105-7718, 105-7718-03
• Related Idler Pulley Numbers: 109-8590, 212824144, 136-5404

Part Number Breakdown

Part numbers below are grouped by component type. This listing is built around the 107-8504 / 285-881 spindle path, with related pulley, blade, and idler references included for fitment review.

• Spindle / Mandrel Numbers: 107-8504, 1078504, 285-881, 285881
• Primary Spindle Pulley Numbers: 105-7734, 1057734, 13639
• Additional Pulley References Found in Supplier Data: 120-6433, 1206433, 105-7735, 1057735, 115-7450, 1157450
• Blade Numbers: 105-7718, 105-7718-03, 1057718, 105771803, 105-7777-03, 108-1114, 108-1123, 110-0405, 08899100, 08979600, 09081200, 038-2007-00, 038-6002-00, 038-6050-00
• Idler Pulley Numbers: 109-8590, 1098590, 212824144, 136-5404, 1365404

Spindle Specifications

• Spindle Number: 107-8504
• Aftermarket Cross-Reference: 285-881
• Height Reference: 7.5 inches
• Outer Diameter Reference: 9-3/8 inches
• Grease Fitting: Yes
• Housing Note: Some aftermarket versions use self-tapping screws because the housing may not be pre-threaded
• Application Note: Confirm spindle height, mounting hole layout, pulley fit, blade hardware, and belt routing before ordering

Pulley Specifications

• Primary Spindle Pulley Numbers: 105-7734, 13639
• Primary Pulley Outer Diameter: 7-5/8 inches
• Primary Pulley Height: 1 inch
• Primary Pulley Inner Diameter: approximately 1-15/16 inches to 2 inches depending on supplier measurement point
• Additional Pulley References Found in Supplier Data: 120-6433, 105-7735, 115-7450
• Additional Pulley Specification Reference: 120-6433 pulley path may measure approximately 6.70-inch outer diameter with 1-inch height
• Pulley Note: Match the pulley part number, bore, outer diameter, and belt path before ordering.

Blade Specifications

• Primary Blade Numbers: 105-7718, 105-7718-03
• Blade Style: Hi-Flow / high-lift mower blade path
• Blade Length Reference: 20.5 inches
• Deck Size Reference: 60 inch when used as a 3-blade package
• Related Blade Cross-References: 105-7777-03, 108-1114, 108-1123, 110-0405, 08899100, 08979600, 09081200, 038-2007-00, 038-6002-00, 038-6050-00

Idler Pulley Specifications

• Idler Pulley Numbers: 109-8590, 212824144
• 109-8590 Width Reference: 2 inches
• 109-8590 Inner Diameter Reference: 7/16 inch
• 109-8590 Outer Diameter Reference: 9 inches
• Additional Idler Pulley Number: 136-5404
• 136-5404 Outer Diameter Reference: 6-3/4 inches on common aftermarket data
• Idler Note: Confirm idler pulley count, pulley position, belt routing, and selected product image before ordering.

Common Symptoms / When to Replace

• Mower deck spindle is noisy, loose, seized, or wobbling
• Blade has excessive play at the spindle shaft
• Deck vibration increases during blade engagement
• Spindle pulley or idler pulley is worn, damaged, bent, or no longer tracking the belt correctly
• Blade is bent, worn, dull, or no longer cutting evenly
• Original spindle, pulley, blade, or idler number matches the listed Toro replacement path

Quick Ship Fulfillment

This item may ship directly from one of our trusted U.S. distribution partners to help reduce transit time. Packaging, labeling, or warehouse origin may vary, but the part will match the replacement numbers, fitment notes, and specifications shown in this listing.

Why Buy From PTO Direct USA

• Fitment-first product organization by replacement part-number path
• Clear spindle, pulley, blade, and idler references for package review
• Built around the lead Toro spindle number instead of loose marketplace keyword data
• U.S.-focused fulfillment options for faster delivery when available

Need a Custom Package?

Need a different combination of parts? Email us the part type and part numbers you need, such as spindle assemblies, blades, belts, pulleys, reinforcement rings, bearings, or hardware. We can review the part-number path and quote a custom package when available.

FAQ

Is this an OEM Toro spindle kit?

No. This is an aftermarket replacement-style spindle kit intended to replace the listed Toro part-number path when the physical fitment details match.

What is the lead spindle number for this listing?

The lead spindle number is 107-8504. The number 285-881 is an aftermarket Stens cross-reference for the same spindle path.

Are 105-7734 and 13639 spindle numbers?

No. 105-7734 and 13639 are spindle pulley numbers and should stay in the pulley bucket.

Are 105-7718 and 105-7718-03 pulley numbers?

No. 105-7718 and 105-7718-03 are mower blade numbers and should stay in the blade bucket.

What are 109-8590, 212824144, and 136-5404?

Those are idler pulley references used in related Toro mower deck belt-routing paths. They should not be treated as spindle assembly numbers.

Should 120-6433, 105-7735, and 115-7450 be included?

They can remain in the breakdown as additional pulley references found in supplier data, but do not treat them as the primary pulley path for this exact package unless the product image or supplier contents confirm them.

Can I order by deck size only?

No. Deck size alone is not enough. Match the original spindle number first, then confirm pulley number, blade number, idler pulley number, mower model, deck layout, mounting pattern, and belt routing before ordering.