Description
xFlexible 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
Shipping & Return
xShipping
We ship orders across USA, If your order is in stock and we process the charges to your credit card, it will ship within one business day from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out. If you do not receive tracking information from us within three business days of your order, feel free to follow up with us at help@roamridge.com.
We offer free economy shipping for orders above $99, also we offer various flat shipping rates across the USA, However please also note that some products such as oversized, Truck shipping items are not covered in free or flat shipping rates. Please verify at checkout before making payment.
Overnight and Two day shipping orders will be shipped the same day if order is received before 2PM CST.
Returns Policy
Roam Ridge offers a return period of 30 days from date of receipt. Return Merchandise Authorization (RMA) numbers are required for all returns. Returned products must be complete in the original packaging and resalable. Non-stock items may not be returned. Opened and/or unsealed DVDs, CDs, and cartography are not returnable unless defective. Units requiring service, either warranty or otherwise, should be returned directly to the appropriate manufacturer. For most items, customers can obtain an RMA number and process their return using the Roam Ridge website. Customers may also obtain an RMA number by sending an email to Help@roamridge.com. Be sure to provide the original invoice number, product being returned, and the reason for return. Returned merchandise may be subject to a restocking fee of up to 15%.
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