STIHL WB03 764 6820 60" Secondary Deck Belt | OEM RZ Mower

STIHL WB03 764 6820 OEM 60" Secondary Deck Belt

The STIHL WB03 764 6820 Secondary Deck Belt is a genuine OEM STIHL replacement belt for select STIHL RZ zero-turn mowers with 60" mower decks. This belt is listed in the 60" Mower Deck - Pulleys, Belts & Idler Arms section for compatible RZ 560, RZ 760, and RZ 960 models.

This belt is described as BELT, B-SEC, 64.50 EL, ARAMID, WRPD. It is used as the secondary deck belt on compatible STIHL 60" mower deck applications and is built to match the correct belt profile, length, routing, and pulley system required by the deck.

Always verify your full STIHL mower model, deck size, original belt part number, belt routing, and parts diagram before ordering. Mower deck belt fitment can vary by deck size, model, and pulley layout.

Product Details

Compatible STIHL Model References

STIHL WB03 764 6820 is listed for the following 60" mower deck applications:

• STIHL RZ 560.0 - 60" Mower Deck, Pulleys, Belts & Idler Arms
• STIHL RZ 560.0 K - 60" Mower Deck, Pulleys, Belts & Idler Arms
• STIHL RZ 760.0 K - 60" Mower Deck, Pulleys, Belts & Idler Arms
• STIHL RZ 760.0i - 60" Mower Deck, Pulleys, Belts & Idler Arms
• STIHL RZ 760.0i K - 60" Mower Deck, Pulleys, Belts & Idler Arms
• STIHL RZ 960.0 K - 60" Mower Deck, Pulleys, Belts & Idler Arms
• STIHL RZ 960.0i - 60" Mower Deck, Pulleys, Belts & Idler Arms
• STIHL RZ 960.0i K - 60" Mower Deck, Pulleys, Belts & Idler Arms

Important: This is the secondary 60" mower deck belt. Confirm your mower has the correct 60" deck and that your STIHL parts diagram lists WB03 764 6820 before ordering. Do not order by model family or deck size alone.

Key Features

• Genuine OEM STIHL 60" secondary mower deck belt
• Part number WB03 764 6820
• OEM description: Belt, B-SEC, 64.50 EL, Aramid, WRPD
• Designed for select STIHL RZ 60" mower deck applications
• Fits select RZ 560, RZ 760, and RZ 960 models where specified
• Used in the mower deck pulleys, belts, and idler arms system
• Helps restore proper deck drive and blade operation
• Factory-correct replacement when listed in your STIHL parts diagram

Why Choose an OEM STIHL Deck Belt?

Mower deck belts are critical to blade drive performance. A worn, stretched, cracked, or incorrect belt can cause slipping, poor cut quality, belt noise, overheating, premature wear, or loss of blade operation.

Genuine STIHL mower deck belts are built to match the correct deck routing, pulley profile, belt length, and load requirements for compatible STIHL mower decks. When your parts diagram lists WB03 764 6820, this OEM belt is the correct replacement for that application.

• Correct OEM fit when specified by STIHL
• Designed for compatible 60" mower deck drive systems
• Helps maintain proper belt tension and blade speed
• Reduces guesswork compared to universal belts
• Recommended for maintaining STIHL mower cutting performance

When to Replace Your Secondary Deck Belt

Replace the deck belt if it is cracked, glazed, frayed, stretched, slipping, or damaged. A failing secondary belt can reduce blade speed and create uneven cutting performance.

• Belt is cracked, frayed, glazed, or worn
• Belt slips or squeals under load
• Blades do not maintain proper speed
• Cut quality is uneven or inconsistent
• Belt jumps off pulleys or does not track correctly
• Deck belt was damaged by debris or pulley failure
• Parts diagram lists STIHL WB03 764 6820 for your mower

Important Fitment Notes

• This is the secondary 60" mower deck belt for select STIHL RZ models
• Fits select RZ 560, RZ 760, and RZ 960 applications where specified
• Verify the original belt part number before ordering
• Do not order by deck size alone
• Confirm belt routing, pulley layout, and idler arm setup
• Some 60" decks use both a main deck belt and a secondary deck belt
• Inspect pulleys, idlers, tensioner arms, and spindle bearings when replacing belts

Pre-Purchase Checklist

Before ordering STIHL WB03 764 6820, confirm:

• Your full STIHL mower model number
• Your mower has the 60" mower deck
• Your original secondary deck belt part number
• Your parts diagram lists WB03 764 6820
• Your belt routing matches the 60" deck diagram
• Your pulleys, idlers, and tensioner arm are in serviceable condition

Installation and Service Notes

Deck belt replacement should be performed with the mower turned off, key removed, parking brake engaged, and all moving parts stopped. Follow the STIHL service instructions and belt routing diagram for your exact mower.

• Take a photo of the belt routing before removing the old belt
• Inspect idler pulleys, spindle pulleys, and tensioner components
• Replace worn or noisy pulleys before installing a new belt
• Make sure the belt is seated correctly in all pulley grooves
• Verify proper tension and deck engagement after installation
• Run and recheck belt tracking before returning the mower to service

Related Belt Note

Some 60" STIHL RZ mower deck applications use both a main deck belt and a secondary deck belt. If you are servicing the complete belt system, verify whether your mower also requires the main deck belt listed in your parts diagram.

Part Number / Search Terms

STIHL WB03 764 6820 may also be searched as:

• STIHL WB03 764 6820
• WB03 764 6820 deck belt
• STIHL WB03 764 6820 belt
• STIHL 60" secondary deck belt
• STIHL 60 inch secondary mower deck belt
• STIHL RZ 560 secondary deck belt
• STIHL RZ 560.0 K secondary deck belt
• STIHL RZ 760 secondary deck belt
• STIHL RZ 760.0i secondary deck belt
• STIHL RZ 760.0i K secondary deck belt
• STIHL RZ 960 secondary deck belt
• STIHL RZ 960.0i secondary deck belt
• STIHL RZ 960.0i K secondary deck belt
• STIHL zero turn mower deck belt
• STIHL OEM mower belt
• STIHL B-SEC 64.50 EL belt
• STIHL aramid wrapped deck belt

Frequently Asked Questions

P&P Small Engines stocks genuine STIHL mower belts, blades, pulleys, idlers, spindles, filters, oils, accessories, and OEM replacement parts for homeowners and professionals.