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Description
WB03 740 5900 STIHL Spindle Assembly Aluminum Long Shaft | RZ 552.0 & RZ 560.0
The STIHL WB03 740 5900 Spindle Assembly Aluminum Long Shaft is a genuine OEM replacement spindle assembly designed for compatible STIHL RZ Series zero-turn mower decks. This assembly is used within the mower deck housing, covers, spindles, and blade system to support and drive the cutting blade.
Features That Make a Difference
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Genuine STIHL OEM replacement part
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Part Number: WB03 740 5900
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Product: Spindle Assembly
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Construction: Aluminum
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Shaft Type: Long Shaft
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Designed for compatible RZ Series mower decks.
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Used within the mower deck spindle and blade assembly.
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Helps maintain proper blade alignment and rotation.
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Ideal for replacing a damaged or worn spindle assembly.
Specifications
| Specification | Details |
|---|---|
| Part Number | WB03 740 5900 |
| Product | Spindle Assembly |
| Material | Aluminum |
| Shaft | Long Shaft |
| Product Type | Mower Deck Spindle Assembly |
| Brand | STIHL |
| Application | RZ Series Zero-Turn Mowers |
| Replacement Type | Genuine OEM |
Compatible Models
Based on the supplied STIHL application information, this spindle assembly is used with:
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RZ 560.0 K — 60" Mower Deck - Housing, Covers, Spindles and Blades
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RZ 560.0 — 60" Mower Deck - Housing, Covers, Spindles and Blades
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RZ 552.0 — 52" Mower Deck - Housing, Covers, Spindles and Blades
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RZ 552.0 K — 52" Mower Deck - Housing, Covers, Spindles and Blades
Compatible Deck Sizes
This spindle assembly is listed for both:
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52-inch mower decks
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60-inch mower decks
Always verify the exact mower model and deck configuration before ordering.
What Does the Spindle Assembly Do?
The spindle assembly is a central component of the mower deck's cutting system. It supports the mower blade and allows the blade to rotate when power is transferred through the deck's belt and pulley system.
A properly functioning spindle assembly helps maintain:
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Smooth blade rotation
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Proper blade alignment
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Stable cutting performance
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Correct blade height and positioning
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Reliable mower deck operation
Signs of a Worn or Damaged Spindle
A spindle assembly may require replacement if you notice:
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Excessive blade wobble
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Unusual grinding or bearing noise
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Excessive deck vibration
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Loose blade movement
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Uneven cutting
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Damaged shaft or housing
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Abnormal belt or pulley wear
Operating a mower with a damaged spindle can cause additional wear to the belt, pulley, blade, and mower deck components.
Installation & Maintenance
Before servicing the spindle assembly:
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Shut off the mower engine and remove the ignition key.
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Make sure all blades and moving components have completely stopped.
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Follow the manufacturer's procedure for safely accessing the mower deck.
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Remove the applicable blade, belt, pulley, and spindle components as required.
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Install the replacement spindle assembly according to the applicable STIHL service procedure.
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Verify proper blade and pulley alignment.
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Confirm that all fasteners are properly secured before operating the mower.
Always follow the current STIHL operator's and service instructions for your specific mower.
Important Compatibility Information
This product is identified as:
WB03 740 5900 — SPINDLE ASSEMBLY ALUMINUM LONG SHAFT
The supplied application information includes the RZ 552.0 / RZ 552.0 K 52-inch decks and the RZ 560.0 / RZ 560.0 K 60-inch decks.
Because mower deck configurations can vary, verify the exact model, deck size, and current STIHL parts diagram before purchasing.
Why Buy from Barry’s Power Equipment?
Barry’s Power Equipment provides quality OEM replacement parts for STIHL outdoor power equipment.
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Genuine OEM replacement parts
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Quality STIHL components
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Competitive Pricing
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Fast Shipping
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Expert Customer Support
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Parts for professional and residential equipment
Restore reliable mower deck performance with the STIHL WB03 740 5900 Aluminum Long-Shaft Spindle Assembly.
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