Spindle Assembly 783506P / 783506 for Hustler FasTrak Mini Z Super Mini Z

Overview

This aftermarket 783506P spindle assembly is a replacement-style mower deck spindle for select Hustler FasTrak, Mini Z, Super Mini Z, TrimStar, and FasTrak SD mower deck applications.

This listing is organized around the 783506P / 783506 spindle path. Some package options may include additional deck repair components such as pulleys, blades, blade bolts, or spring washers, but the lead replacement path is the spindle assembly.

Key Features

• Aftermarket replacement-style mower deck spindle assembly
• Product Type: Spindle Assembly
• Lead Part Number: 783506P
• Also Replaces: 783506
• Common Deck References: 36 inch, 42 inch, 44 inch, 48 inch, 52 inch, 54 inch, and 60 inch deck references appear across the fitment data
• Optional package variants may include spindle assemblies, pulleys, blades, blade bolts, and spring washers
• Organized by spindle or mandrel part number first to reduce fitment confusion

Compatible Brands & Model Series

This 783506P spindle assembly is associated with select Hustler mower deck applications.

Hustler model references include:

• FasTrak 44-inch, 48-inch, 52-inch, 54-inch, and 60-inch deck references
• FasTrak SD 36-inch, 42-inch, 44-inch, 48-inch, 52-inch, 54-inch, and 60-inch deck references
• Mini Z 36-inch, 42-inch, 44-inch, and 52-inch deck references
• Super Mini Z 44-inch and 52-inch deck references
• Super Mini Z HT 52-inch deck references
• TrimStar 36-inch, 48-inch, and 54-inch deck references
• RD FasTrak 48-inch and 54-inch deck references
• FasTrak 52-inch models produced prior to serial number 1011
• Mini Z and FasTrak SD 36-inch and 42-inch models with serial number 07020000 and higher references

Verify your part numbers before ordering.

Replaces OEM Part Numbers

• Hustler: 783506P, 783506

Optional Package Part Number Breakdown

Part numbers below may apply to optional package variants. Not every package includes every component listed. Select the package option that matches the parts needed for your repair.

• Spindle / Mandrel Numbers: 783506P, 783506
• Spindle Pulley Number: 786889
• Medium Lift Blade Numbers: 795526, 795526X, 795526Y, 781898, 782532, 783753, 783753X, 785436, 785436X, 785436Y, 603995, 603995X
• Blade Bolt Numbers: 781872, 782474
• Washer Number: 1-513208

Single Spindle Specifications

• Spindle Part Number: 783506P
• Also Replaces: 783506
• Deck Size References: 44 inch and 52 inch in single-spindle source data
• Length: 139.7 mm / 5.50 inches
• Width: 133 mm / 5.24 inches
• Height: 133 mm / 5.24 inches
• Material: Aluminum

Optional Package Component Specifications

The following specifications apply to optional package variants that include additional deck repair components.

• Spindle Length: 140 mm / 5.50 inches
• Spindle Outer Diameter: 163.5 mm / 6.43 inches
• Spindle Mounting Hole Distance: 109 mm / 4.30 inches
• Spindle Pulley Number: 786889
• Spindle Pulley Width: 28 mm / 1.1 inches
• Spindle Pulley Inner Diameter: 24 mm / 0.94 inch
• Spindle Pulley Outer Diameter: 141 mm / 5.55 inches
• Medium Lift Blade Length: 454 mm / 17.875 inches
• Medium Lift Blade Thickness: 5.6 mm / 0.22 inch
• Medium Lift Blade Hole Diameter: 15.8 mm / 0.625 inch
• Blade Type: Medium lift, powder coated
• Blade Bolt Stud Length: 31.5 mm / 1.24 inches
• Blade Bolt Head Diameter: 25 mm / 0.98 inch
• Blade Bolt Thread Size: 5/8-11
• Blade Bolt Length: 42.5 mm / 1.67 inches
• Blade Bolt Material: Steel
• Spring Washer Outer Diameter: 56.3 mm / 2.21 inches
• Spring Washer Inner Diameter: 17.2 mm / 0.67 inch

Installation Note

Some Hustler spindle applications use mounting holes that are not pre-threaded. A power tool may be needed to install the bolts. This design is intended to withstand mower deck vibration after proper installation.

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
• Pulley or blade system is worn, damaged, or no longer tracking correctly
• Original spindle number matches 783506P or 783506

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, bolt, and washer references for package variants
• U.S.-focused fulfillment options for faster delivery when available

Need Help Confirming Fitment?

Send us your mower model number, deck size, and the part number stamped on your original spindle or mandrel assembly. We can help confirm whether this is the correct replacement path.

FAQ

Is this an OEM Hustler spindle assembly?

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

What is the lead part number for this listing?

The lead spindle part number is 783506P. This listing also references 783506 in the same spindle path.

Do all package options include pulleys, blades, bolts, and washers?

No. Package contents vary by selected option. Use the variant title and product images to confirm whether you are ordering a single spindle assembly or a larger deck repair package.

Can I order by deck size only?

No. Deck size alone is not enough. Match the original spindle or mandrel number and confirm your mower model, deck setup, pulley layout, mounting pattern, and blade path before ordering.