21727737 Alternator | Genuine Volvo Penta Part
21727737 Alternator | Genuine Volvo Penta Part
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✓ Authorised Volvo Penta Dealer · Genuine Volvo Penta parts · Ships Australia-wide
🔧 Product Description
A genuine heavy-duty three-phase alternator used on selected Volvo Penta industrial and marine diesel engines. It supplies regulated charging current for the battery bank and engine electrical loads.
🚤 Compatibility
- HP Range: Approximately 250-400 HP
- Year Range: Approximately 2010 - 2021
⚙️ Key Features
- Heavy-duty three-phase alternator construction
- Integrated or matched voltage regulation
- Industrial-engine heat and vibration resistance
- Factory mounting and pulley alignment
- Direct replacement for the specified charging system
- Engine type: 7.7L inline six-cylinder turbocharged industrial diesel
- Also supersedes Volvo part numbers 3090430 and 3803573
🔌 Function
An engine-driven charging unit that converts mechanical rotation into regulated electrical power for the batteries and electrical system.
⚠️ Common Signs of Failure
- Low or high charging voltage
- Battery warning lamp remains active
- Bearing noise or pulley wobble
- Overheated output cable or terminals
- Intermittent charging as the unit warms
🛠️ Service Notes
- Isolate the batteries before you start, and never disconnect the alternator or battery cables with the engine running — that will destroy the diodes
- Reconnect exactly as it came off, correct polarity, terminals clean and tight, and check the earth path through the mountings and engine is sound
- Check the pulleys line up and the belt runs true; renew a glazed, cracked or oil-contaminated belt at the same time and tension it by the procedure in the manual for your engine
- Support the alternator while you fit and tighten the mounting and adjusting bolts to the manual's figures, and never lever against the alternator body or end covers
- After fitting, confirm the charge warning goes out and charging voltage is correct, and recheck belt tension after the first running period
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 21727737 → Supersedes 21048177 → Supersedes 21048174 → Supersedes 3986428 → Supersedes 3803574
OEM / Related Numbers
- 21048177 earlier number superseded by this part
- 3986429 earlier number superseded by this part
- 21048174 earlier number superseded by this part
- 3986428 earlier number superseded by this part
- 3803574 earlier number superseded by this part
📦 Condition
- Genuine Volvo Penta part
- Brand new
- Supplied in original or equivalent packaging
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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