Volvo Penta — Hydraulic Steering Nipple — 984378
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Volvo Penta 984378 Hydraulic Steering Nipple
Volvo Penta 984378 is a genuine OEM hydraulic nipple used in steering-system hose and cylinder assemblies. It connects hydraulic steering plumbing at the steering cylinder or steering-control assembly in selected DPH, DPR, and D3 installations.
Compatible Applications
- DPH-A steering systems
- DPH-B steering systems
- DPH-D1 steering systems
- DPR-A steering systems
- DPR-B steering systems
- DPR-D steering systems
- DPH and DPR single steering-cylinder installations
- DPH and DPR starboard twin steering-cylinder installations
- D3-140A-G electronic-steering systems
- D3-170A-G electronic-steering systems
- D3-200A-G electronic-steering systems
- D3-220A-G electronic-steering systems
Confirm the exact drive model, engine model, steering configuration, and applicable Volvo Penta diagram before ordering. Steering assemblies can use both 984378 and nearby nipple 984379, and the two should not be treated as interchangeable based on appearance.
Part Details
- Brand: Volvo Penta
- Part number: 984378
- Official description: Nipple
- Product type: Hydraulic steering nipple
- System: Hydraulic and electronic steering
- Diagram locations: Steering cylinder, electronic steering, and sterndrive joystick systems
- Typical diagram quantity: One per applicable assembly
Related Parts
- 3863223: Hydraulic hose
- 984379: Adjacent hydraulic nipple
- 984376: Plug
- 925053: O-ring
- 3862321: Valve
- 21548739: Hydraulic hose kit
When to Replace
Replace the nipple if its threads or sealing surfaces are damaged, corrosion is present around the connection, hydraulic fluid is leaking at the fitting, the fitting was distorted during hose removal, or an incorrect substitute was previously installed. Any leak should also prompt inspection of the connected hose, O-rings, and nearby steering components.
Installation Notes
Install 984378 only in the diagram position specified for the steering system. Inspect the mating hydraulic hose and surrounding components for damage or contamination before assembly. Follow the applicable Volvo Penta workshop procedure for tightening specifications, hydraulic-system assembly, and steering-system bleeding.
Technical FAQ
Is 984378 interchangeable with 984379?
No interchangeability is established. Match the part number to the exact hose connection and diagram position.
Does this fit every DPH, DPR, or D3 installation?
No. Fitment depends on the complete drive or engine designation, steering configuration, and applicable parts diagram.
Is hydraulic hose 3863223 included?
It is shown as a related component in applicable assemblies. Confirm included components before ordering.
Parts Desk Insights
Best use case: Use this genuine fitting where the applicable Volvo Penta steering-cylinder or electronic-steering diagram specifies 984378.
Most common mistake: Confusing 984378 with adjacent nipple 984379 because both appear in the same hydraulic system.
Fitment guidance: Match the exact hose connection, diagram position, drive or engine model, and steering configuration rather than choosing the fitting by appearance.
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.