Volvo Penta OEM Alternator Multi-V-Belt Pulley 866220 | TAD730G TAD740GE TWD740GE TWD740VE TAMD74
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Volvo Penta OEM Alternator Multi-V-Belt Pulley — Part 866220
- Part Number: 866220
- Brand: Volvo Penta (Genuine OEM)
- Official Product Type: Alternator Parts — Multi-V / Multi-Rib Belt Pulley
- System: Electrical / Charging — alternator accessory-drive belt system
- Diagram Position: Item 3 in applicable Volvo Penta alternator schematics; mounted directly on the alternator shaft
- Drive Type: Multi-V / multi-rib belt
- Alternator Voltage: Used with selected 28V Volvo Penta alternator systems
- Weight: approx. 0.7 kg
What It Does
The 866220 is the genuine Volvo Penta OEM alternator pulley used in multi-V / multi-rib belt drive systems on selected Volvo Penta marine and industrial diesel engines. It mounts directly on the alternator shaft and transfers belt drive from the engine accessory system to the alternator. Volvo Penta parts diagrams place 866220 at the alternator shaft in both single- and twin-alternator configurations depending on the engine installation — some twin-alternator arrangements require two 866220 pulleys.
Compatible Applications
Confirm fitment by engine model, serial number, alternator part number, and Volvo Penta parts diagram position before ordering. Volvo Penta used different alternator, pulley, and belt arrangements within the same engine families.
- TAD730G — selected alternator configurations
- TAD740GE — 28V 60A alternator with multi-V belt 9146844
- TAD741GE — selected alternator configurations
- TWD740GE — selected alternator configurations with multi-V belt 9146899
- TWD740VE — 55A and 80A low-left-mounted alternator configurations; also twin-mounted 55A alternator arrangements (may require two pulleys)
- TD640VE — selected alternator configurations
- TAMD74C-A — charging-system assembly applications
Not sure it fits? Send us your Volvo Penta engine model and serial number before ordering.
Related Components
Depending on engine configuration, inspect these components in the alternator belt drive assembly when servicing the pulley. These parts are sold separately and are not included with 866220:
- 873757 / 873771 — Alternator
- 3803443 — Remanufactured alternator (applicable systems)
- 849354 — Alternator bracket
- 847956 — Tensioner
- 849295 — Tensioner (alternate configuration)
- 9146844 — Multi-V belt (selected TAD740GE installations)
- 9146899 — Multi-V belt (selected TWD740GE / TWD740VE installations)
- 3581460 — Drive belt (selected TD640VE / TWD740VE installations)
- 955900 — Washer (applicable alternator assemblies)
Part Numbers
- 866220 — Current Volvo Penta OEM reference
Note on 822573: Volvo Penta diagrams show 822573 as a pulley option in some related alternator assemblies, but it is not a confirmed direct substitute for 866220. Verify the alternator model, engine serial number, and belt arrangement before treating 822573 as an alternative.
When to Replace
Inspect or replace the alternator pulley when there is:
- Visible groove wear or damage on the belt-running surface
- Corrosion or pitting on the pulley groove
- Belt tracking problems or belt walking off the pulley
- Excessive belt noise traced to the alternator drive
- Pulley distortion or physical damage from impact or over-tensioning
- Damage discovered during alternator replacement
- Repeated premature belt wear that has been traced to the pulley
Inspect the belt, tensioner, and alternator shaft condition whenever pulley wear is found — a worn pulley that has been running against the belt will often cause accelerated belt wear as well.
Service Interval
No fixed replacement interval for the pulley — replace on condition. Inspect at each belt service interval and whenever the alternator or belt is removed. Replace immediately if groove wear, corrosion, or distortion is found. Follow the Volvo Penta workshop manual for belt inspection and tension check intervals specific to the engine model.
Installation Notes
- Confirm the alternator configuration (single or twin, voltage, and amperage rating) and that 866220 is specified in the Volvo Penta diagram for your exact installation
- For twin-alternator installations that require two pulleys, confirm quantity from the engine diagram before ordering
- Inspect the alternator shaft for wear or damage before fitting the replacement pulley
- Inspect the belt and tensioner while the pulley is accessible and replace if worn
- Check belt alignment after installation — misalignment causes rapid groove and belt wear
- Follow the Volvo Penta workshop procedure for pulley retention and alternator installation; do not apply a generic fastener torque without referencing the service specification
Technical FAQ
Q: Can I use 822573 instead of 866220?
822573 appears in some Volvo Penta alternator assemblies as a pulley option, but it is not a confirmed universal substitute for 866220. Confirm the alternator model, engine serial number, and belt arrangement against the specific Volvo Penta parts diagram before substituting one for the other.
Q: How do I confirm which belt goes with pulley 866220 on my engine?
The correct belt depends on the specific alternator and engine configuration. On TAD740GE with the 28V 60A alternator, Volvo Penta specifies multi-V belt 9146844. On TWD740GE and TWD740VE applications, 9146899 is used in selected configurations. Confirm against the parts diagram for your engine serial number.
Q: My TWD740VE has two alternators — do I need two pulleys?
Possibly. Twin-alternator arrangements on TWD740VE can require two 866220 pulleys depending on the specific installation. Check the alternator schematic for your engine configuration to confirm the quantity before ordering.
Q: What causes premature pulley wear on these engines?
The most common causes are incorrect belt tension, belt misalignment, and corrosion on the pulley groove from moisture exposure in marine installations. Inspect the tensioner and belt alignment whenever the pulley shows abnormal wear.
Parts Desk Insights
The main thing to get right with 866220 is the alternator configuration. Volvo Penta used this pulley across several single- and twin-alternator arrangements, and some engines have more than one pulley option in the catalog depending on the alternator fitted. Matching by engine serial number and the specific alternator part number is the most reliable approach — ordering by engine model alone without the alternator specification is where mismatches happen. The other common issue is customers who replace the belt and tensioner but leave the old pulley in place when it shows groove wear. A worn pulley groove will wear the new belt at an accelerated rate in the same spot. If the belt has been failing prematurely, inspect the pulley groove closely before assuming the belt or tensioner is the only problem.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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