845021 Tensioner | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta tensioner from the Alternator, Charging, Electric Motor and Electric Drives group, weighing 0.129 kg and listed for 210 applications across the TD, MD, TMD, AD, D and AQAD series engines. It consolidates five earlier numbers: 834625, 834964, 841768, 841378 and 946150.

🚤 Compatibility

• Engine Family: TD, MD, TMD, AD, D, AQAD, TWD, TAMD, BB, HS, TID, AQD
• HP Range: 55-435 HP

Full model list at the end of this description.

⚙️ Key Features

• Consolidates 834625, 834964, 841768, 841378 and 946150
• 0.129 kg
• 210 applications across the TD, MD, TMD, AD, D and AQAD series
• Alternator and charging group

🔌 Function

Holds the alternator against its belt and lets the belt be tensioned and locked at the correct setting.

⚠️ Common Signs of Failure

• Belt squeal on start-up or under load
• Belt tension slipping back soon after adjustment
• Slot worn into an elongated hole so the setting will not hold
• Bent or twisted strap, letting the alternator sit out of line
• Belt dust and shed rubber around the front of the engine

🛠️ Service Notes

• Fit a new belt at the same time and retension after the first hours of running
• Check the alternator mounting bolts and bushes; a worn tensioner is often a symptom of a loose mounting
• This one number covers five earlier tensioners, so it is the current answer for any of those old references

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 845021 → Supersedes 834625

OEM / Related Numbers

• 946150 earlier number superseded by this part

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D6-370A-C, D6-350A-A, D6-350A-B, D6-330A-D, D6-330D-E, D6-370D-E, D6-370D-B, D6-330D-B, D6-330A-F, D6-370A-F, D6-330D-C, D6-330A-C, D6-370D-C, D6-330D-D, D6-370D-D, D6-330D-F, D6-370A-D, D6-330A-E, D6-370A-E, D6-370D-F, D6-330I-D, D6-310I-B, D6-280I-B, D6-280I-E, D6-280I-D, D6-310I-D, D6-435I-D, D6-310I-E, D6-280I-A, D6-310I-A, D6-300A-F, D6-300D-F, D6-300I-F, D6-310D-B, D6-310D-D, D6-310D-C, D6-310D-E, D6-370I-A, D6-370I-B, D6-330I-B, D6-330I-C, D6-370I-C, D6-310A-B, D6-280A-C, D6-310A-C, D6-310A-A, D6-280A-D, D6-310A-D, D6-280A-E, D6-310A-E, D6-280I-C, D6-310I-C, D6-280A-A, D6-280A-B, D6-330I-F, D6-370I-F, D6-400A-E, D6-435D-A, D6-435D-D, D6-435D-E, D6-435D-F, D6-435I-A, D6-435I-C, D6-435I-E, D6-400A-F, D6-435D-C, D6-435I-F, D6-370I-D, D6-330I-E, D6-370I-E, D6-330A-B, D6-370A-B
• Volvo Penta D4-260A-B, D4-260A-A, D4-260A-C, D4-260A-D, D4-260A-E, D4-260A-F, D4-260D-B, D4-260D-C, D4-260D-D, D4-260D-E, D4-260D-F, D4-260I-A, D4-260I-B, D4-260I-C, D4-260I-D, D4-260I-E, D4-260I-F, D4-300A-A, D4-300A-C, D4-300A-D, D4-300A-E, D4-300A-F, D4-300D-A, D4-300D-C, D4-300D-D, D4-300D-E, D4-300D-F, D4-300I-A, D4-180I-C, D4-225I-C, D4-180I-D, D4-225I-D, D4-180I-E, D4-225I-E, D4-180I-F, D4-225I-F, D4-210A-A, D4-210A-B, D4-225A-B, D4-225A-C, D4-225A-D, D4-300I-C, D4-300I-D, D4-300I-E, D4-300I-F, D4-225A-E, D4-225A-F, D4-210I-A, D4-210I-B, D4-180I-B, D4-225I-B
• Volvo Penta TAMD31L, TAMD31L-A, TAMD31M, TAMD31M-A, TAMD31P, TAMD31P-A, TAMD31S, TAMD31A, TAMD31B, TAMD31D
• Volvo Penta AD41P-B, AD41B, AD41D, AD41L-A, AD41P-A, AD41, AD41A, AD41BJ
• Volvo Penta D2-55, D2-55B, D2-55C, D2-55D, D2-55E, D2-75, D2-75B, D2-75C
• Volvo Penta TAMD41B, TAMD41D, TAMD41H-A, TAMD41H-B, TAMD41M-A, TAMD41P-A, TAMD41P, TAMD41A
• Volvo Penta AD31, AD31B, AD31D, AD31D-A, AD31L-A, AD31P-A, AD31XD
• Volvo Penta D41, D41B, D41D, D41L-A
• Volvo Penta TMD31A, TMD31B, TMD31D, TMD31L-A
• Volvo Penta TMD41A, TMD41B, TMD41D, TMD41L-A
• Volvo Penta TD120C, TD120G, TD120GG PP
• Volvo Penta TMD40A, TMD40B, TMD40C
• Volvo Penta AQAD40B, AQAD40A
• Volvo Penta D45BPP, D45A
• Volvo Penta TAMD40A, TAMD40B
• Volvo Penta AD30A
• Volvo Penta AD40B
• Volvo Penta AQAD30A
• Volvo Penta AQD40A
• Volvo Penta BB740A
• Volvo Penta D100B
• Volvo Penta HS1A
• Volvo Penta MD30A
• Volvo Penta MD31A
• Volvo Penta MD40A
• Volvo Penta 740A
• Volvo Penta TAMD30A
• Volvo Penta TD100A
• Volvo Penta TD121G-87
• Volvo Penta TD30A
• Volvo Penta TD31ACE
• Volvo Penta TD40A
• Volvo Penta TD45B
• Volvo Penta TID120FG
• Volvo Penta TID121K-87
• Volvo Penta TMD30A
• Volvo Penta TWD1230ME