Description

The IsoFlex IFC-6300-HT Gear Guard is a high-performance flexible gearbox coupling designed to protect marine driveline systems by absorbing shock loads, reducing vibration, and compensating for minor misalignment between the transmission and propeller shaft.

Manufactured from IsoFlex’s engineering-grade polymer, this coupling acts as a sacrificial drivetrain component, designed to fail before damage occurs to expensive gearboxes, shafts, or engines. It provides a non-metallic barrier that isolates vibration and significantly reduces drivetrain noise and gear chatter.

This model is a direct equivalent to the Globe DriveSaver 7256PR, making it a common upgrade or replacement in marine propulsion systems using Allison, ZF, and Newage transmissions.

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Key Features

• IsoFlex high-torque (HT) flexible coupling
• Equivalent to Globe 7256PR DriveSaver
• Absorbs vibration, shock, and torsional loads
• Compensates for minor driveline misalignment
• Protects gearbox, shaft, and engine components
• Engineering-grade polymer construction (oil/fuel/water resistant)
• Acts as a sacrificial “fuse” in drivetrain failures

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Compatibility

Transmission Compatibility

Commonly used with:

• Allison Marine Transmissions
  • M11, M15, M17, M20
• ZF Marine Transmissions
  • ZF 220V
  • ZF 305-2 / 305-2A
  • ZF 302 / 310 / 311 / 311A
• Newage / PRM Transmissions
  • PRM 601
  • PRM 1000
  • PRM 1200S
  • PRM 1500S
  • PRM 1750S

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Globe / DriveSaver Cross Compatibility

• Direct replacement for:
  • Globe 7256PR DriveSaver
  • DriveSaver Plus Rated 7-1/4″ coupling systems

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Marine Driveline Applications

Used in:

• Inboard marine engines
• Shaft-driven propulsion systems
• Commercial and recreational vessels
• Diesel marine drivetrains (mid to heavy-duty)

Suitable for pleasure craft, charter boats, and commercial vessels depending on torque rating

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Serial Number Fitment Notice

Fitment depends on:

• Gearbox flange size (7-1/4″ required)
• Bolt pattern (6-bolt configuration)
• Torque requirements of engine/transmission

Always confirm compatibility using your flange dimensions and transmission model before ordering.

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Specifications (Fitment Critical)

• Flange Diameter: 7-1/4″ (184 mm)
• Bolt Pattern: 6 bolt
• Bolt Size: 5/8″ (≈M16)
• Bolt Circle: 6″ (152 mm)
• Pilot Diameter: 3-3/4″ (95 mm)
• Outside Diameter: 8.3″ (212 mm)
• Thickness: 1-1/2″ (38 mm)
• Material: Engineering-grade polymer

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What’s Included

• IsoFlex flexible coupling disc (IFC-6300-HT)
• Hardware may vary depending on configuration

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When This Part Needs Replacement

Replace the coupling if you notice:

• Excessive vibration or noise
• Visible cracking or deformation
• Driveline shock damage
• Coupling failure after impact (log, rope, etc.)

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Installation Notes

• Install between transmission and shaft flange
• Ensure proper alignment before tightening
• Torque bolts evenly in sequence
• Verify clearance and shaft alignment after install
• Replace bushings/hardware if worn

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Alternate / Superseded Part Numbers

OEM Cross References

• IsoFlex: IFC-6300-HT

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Major Cross References

• Globe: 7256PR (DriveSaver)

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Related Components

• IsoFlex T-Bushing Kits (e.g., TBUSHKIT3/4)
• IsoFlex Flexible Couplings (IFC series)

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Shipping

Shipping: Ships same or next day for fast Canada wide shipping.

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Parts Desk Insight

This is a classic 7-1/4″ 6-bolt coupling size—very common on ZF and Allison setups. If you’re replacing a DriveSaver 7256PR, this IsoFlex unit is a direct match