Volvo Penta 21840806 Trimming Cylinder – Starboard DPH DPR Sterndrive
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Volvo Penta 21840806 is a genuine OEM starboard trimming cylinder for the hydraulic power-trim system used on selected DPH and DPR sterndrives. The cylinder raises and lowers the sterndrive under hydraulic pressure, allowing the operator to adjust drive trim for running angle, performance, and handling. This is the starboard (right-hand) side cylinder only — sold individually.
Part Information
- Part Number: 21840806
- Brand: Volvo Penta
- Official Product Type: Hydraulic Trimming Cylinder – Starboard (OEM)
- Supersedes: 3888301
- Replaced By: 21840806 is the current active OEM number
- System: Hydraulic Power-Trim – DPH / DPR Sterndrive
- Position: Starboard / right-hand side
- Sold As: Individual cylinder (not a pair)
Dimensions & Specifications
- Weight: ~4.5 kg (estimated)
- Fit Type: OEM direct replacement
- Note: Port and starboard cylinders use different part numbers and are not interchangeable
Compatible Applications
- Volvo Penta DPH-A sterndrive
- Volvo Penta DPH-C sterndrive
- Volvo Penta DPH-D1 sterndrive
- Volvo Penta DPH-E sterndrive
- Volvo Penta DPR-A sterndrive
- Volvo Penta DPR-B sterndrive
- Volvo Penta DPR-C sterndrive
- Volvo Penta DPR-D sterndrive
- Volvo Penta TSK DPH-A
- Volvo Penta TSK DPH-B
- Volvo Penta TSK DPH-E
Volvo Penta trim diagrams for DPH-D1 specifically identify 21840806 as the starboard cylinder. Fitment can vary by drive model, trim-system configuration, and production range. Always confirm part number 21840806 against your exact drive model and serial number before ordering. Volvo Penta used several trim-cylinder configurations across DPH, DPR, and later drive generations — the correct cylinder is determined by the drive and installation, not engine horsepower alone.
When to Replace
Replace this trimming cylinder when it develops hydraulic leakage, corrosion or scoring on the piston rod, excessive play at its mounting points, or can no longer reliably hold or adjust sterndrive position. At the same time, inspect hydraulic hoses, seals, bushings, and mounting hardware for wear or damage.
Installation Notes
This cylinder installs on the starboard side of the sterndrive trim assembly. Before installation, inspect the hydraulic hoses, fittings, bushings, and mounting hardware, and verify that the hydraulic system is clean and free of contamination. After installation, bleed and operate the trim system according to the applicable Volvo Penta service procedure and check thoroughly for leaks before returning the vessel to service.
Alternate & Superseded Part Numbers
- 21840806 – Current active Volvo Penta OEM part number
- 3888301 – Previous Volvo Penta number, superseded by 21840806
Parts Desk Insights
This is the starboard trim cylinder only — not a complete pair. Because DPH and DPR systems use side-specific trim components, the most common ordering mistake is assuming one part number covers both sides. Before ordering, confirm whether the repair requires the starboard cylinder, the port-side cylinder, or both. This part is best suited for targeted starboard trim-cylinder replacement on DPH and DPR sterndrives where the original cylinder has developed a hydraulic leak or physical damage.
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
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.