| DS1351-99774 | 910-057 | $1,200.00 |
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![main product photo](https://www.marinedepotdirect.com/media/catalog/product/cache/d0424a5c85947baabb7b3ff8eb1c54d0/9/9/99774xl_12oxmunkg47poing.jpg "R & D Flexible Shaft Coupling f/5" B/W, Hurth, & Volvo - 25HP/100RPM Capacity")
R & D Flexible Shaft Coupling f/5" B/W, Hurth, & Volvo - 25HP/100RPM Capacity
R & D FLEXIBLE COUPLING F/ 5" X 25HP B/W
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Technical Information Guide
Flexible Shaft Coupling for 5" B/W, Hurth, & Volvo - 25HP/100RPM Capacity
The R & D Marine Flexible Coupling consists of a flexible disc molded with a polyester elastomer. The disc gives clearance for bolt heads and is able to flex freely to take up any temporary misalignment of the engine and shaft due to flexing of the boat structure or the engine moving on its mount. Forward thrust is taken in compression on the disc between the two half couplings, and reverse thrust is retaken in compression on the disc between the two fail-safe straps. In the unlikely event of a severe impact, the steel straps make the coupling fail-safe and ensure the drive is maintained both forward and reverse.
Reduce Engine Noise & Transmission Vibration
Staggered bolts enable the element to isolate vibrations and compensate for some misalignment.
Reduces Costly Transmission Repairs
Absorbs shock loads due to hard gear changes.
Fits Most Major Transmissions
For engines, 5 to 1,500 horsepower It fits brands such as Borg Warner, ZF-Hurth, Twin Disc, Volvo, Yanmar, Technodrive, and more.
Under Compression Load In Both Forward & Reverse
The aft steel strap bolted to the transmission acts as a backing plate to prevent reverse thrust from pulling the element apart.
Quick & Easy Installation
The R & D Marine Flexible Coupling requires no machining and comes supplied with bolts to connect between the two existing shaft flanges.
Extremely Durable
Impervious to saltwater, diesel, and lubrication oils. The Flexible Couplings are made from a polyester elastomer not affected by saltwater, diesel, or lubrication fluids.
Fail-Safe Design
A fail-safe design is incorporated in the R & D Flexible Shaft Coupling that prevents the two couplings from pulling apart in the event of an impact or element failure, whereas other couplings do not. This fail-safe design is accomplished by using two steel straps and thru-bolts going into both the shaft coupling and transmission output flange. The aft steel strap is bolted to the transmission output flange, and the front strap is bolted to the shaft coupling. In the event of an impact, the aft steel strap (bolted to the transmission) will catch the front steel strap (bolted to the shaft coupling) and prevent the drivetrain from pulling apart.
The R & D element will absorb the shock load (reducing or eliminating damage to the transmission) and will maintain contact between the two couplings. The steel straps also keep the R & D Flex-Coupling under a compression load in both forward and reverse operation (the aft strap bolted to the transmission acts as a backing plate).
Machined Not Molded
The Drivesaver is molded, while the R & D Flexible Shaft Coupling is machined. Both designs suggested that you first set your alignment by drawing the two couplings up to each other and then adding the flex-coupling. The machined part will have MUCH tighter tolerance than a molded part.
Checking Alignment
The R & D Flexible Shaft Coupling allows for alignment inspection after the element is bolted in place. There is one bolt head that is machined and painted red. After the R & D Flexible Shaft Coupling is bolted into place, a feeler gauge can be slipped between the red bolt head and the coupling. This process is repeated with the same bolt four times at 90-degree intervals by rotating the shaft. If the gap is within .010" (0.25mm), the engine is accurately aligned.
To calculate the power of the coupling required:
Horse Power of Engine x Reduction Ratio x 100 = HP/100RPM
Engine Speed
Example:
- Ford 150 HP at 2500 RPM with Borg Warner Velvet Drive 72C 2:1 Reduction Ratio
- Engine Horse Power is 150 HP, Max Rated RPM is 2500, Reduction Ratio is 2:1
- 150/2500 x 2 x 100 = 12 HP per 100RPM
- The coupling required is 910-009
Specifications:
- Manufacturer: B/W, Hurth, Volvo
- Diameter (inches/mm): 5 / 127
- # of Bolts: 4
- Diameter of Holes (inches/mm): 0.44 / 11.2
- Bolt Pitch Circle (inches/mm): 4.25 / 107.9
- Register (inches/mm): 2.5 / 63.5
- Diameter (inches/mm): 5.63 / 143
- Length (inches/mm): 2.06 / 52.4
- Bolt Diameter: 7/16 UNF
- HP per 100 RPM (hp / kW): 25 / 18.64
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Apply NowRETURN POLICY
We accept returns on most items within 30 days of delivery.
To start a return, submit a Return Authorization (RA) request using the form below. The RA must be issued within 30 days of the delivery date, and the item must be received back at our warehouse within 14 days of the RA being issued.
Requirements for a full refund include:
1. Item must be in new, uninstalled condition.
2. Item must be returned with all original packaging, hardware, and accessories.
3. Return shipping is prepaid by the customer unless the item arrived damaged, defective, or incorrect due to our error.
4. RA number must be clearly marked on the outside of the package.
NON-RETURNABLE ITEMS: The following are final sale and cannot be returned:
- Special order, built-to-order, or custom items
- Items cut, drilled, modified, or installed
- Items missing original packaging or accessories
- Items without proof of purchase
General - Cancellations, Shipping Damage, Missing Packages, Shipment Refusals:
Claims of shipping damage, incorrect items, or missing items must be reported within seven (7) days of delivery. For LTL freight shipments, damage must be noted on the delivery receipt at the time of delivery. Concealed damage claims after a clean signed POD are difficult to recover and may be denied by the carrier. Orders that have been processed and shipped cannot be cancelled, and you may need to wait until you receive the merchandise in order to return it. Customer is responsible for all costs associated with refused shipments including carrier fees, freight to the customer, and return freight. We reserve the right to refuse returns that are sent COD, without a return authorization, show signs of undisclosed installation/use, have missing parts/packaging, missing proof of purchase, or have SKU numbers that do not match our records. If you do not comply with any of the above conditions, we reserve the right to refuse the return/exchange, or to impose different or additional conditions.
Must Be Returned to the Following Address:
Marine Depot Direct
Returns Department
14716 Central Ave
Chino CA 91710
PARTIAL REFUNDS OR RESTOCKING FEES
| Condition | Refund |
|---|---|
| New condition, within 30-day window | 100% of the item price (less return shipping) |
| New condition, past 30-day window (case-by-case)* | 80% of the item price |
| Items that are damaged, missing parts, not in the original condition, or have obvious signs of use for reasons not due to our error | Up to 50% of the item price |
| Products that are unusable, destroyed, or incomplete to the point of no resale value | 0% of the item price |
*For most items, the return window is 30 days after delivery. LTL freight items, oversized items, and large hardware assemblies may be subject to an additional restocking fee to cover return freight and inspection. This will be disclosed when the RA is issued.
How Refunds Are Issued
If you're receiving a refund after we have received your item, it may take an additional three to five business days to process your return fully and issue your refund.
Once we issue your refund, it may take additional time for your funds to be made available in your account by your financial institution. See the following table for more details.
| Refund Method | Refund Time (After Refund Is Processed) |
|---|---|
| Credit card | Three to five business days |
| Debit card | Up to 10 business days |
| Checking account | Up to 10 business days |
Shipping
In-stock items ship within 1 business day from our California or Florida warehouse. Items showing a lead time above ship once stock arrives at our warehouse.
> Same-day shipping on orders placed before 9:00 AM Pacific Time
> Standard ground delivery is 3-7 business days. Need it sooner? Choose Next Day Air or 2nd Day Air at checkout.
> Free shipping on U.S. orders over $99 (excluding AK and HI)
> Oversized items ship by LTL freight. Inspect the shipment and note any damage on the delivery receipt before signing.
> International shipping to Canada and other countries available at checkout
For full details, see our Shipping Policy.