21116405 Reversing Gear | Genuine Volvo Penta Part

🔧 Product Description

Complete genuine Volvo Penta HS45A-A hydraulic reversing gear with a 2.43:1 reduction ratio. This assembly is intended for matched shaft-drive installations and must retain the correct bell housing, input coupling, output flange and control arrangement.

⚙️ Key Features

• Volvo Penta HS45A-A transmission
• 2.43:1 reduction ratio
• Hydraulic clutch engagement
• Marine shaft-drive configuration
• ZF Hurth manufacturer identification confirmed

🔌 Function

The transmission reduces engine speed to the required propeller-shaft speed and selects forward, neutral or reverse.

⚠️ Common Signs of Failure

• Delayed or harsh engagement
• Transmission slipping under load
• Bearing or gear noise
• Burnt or contaminated ATF
• Failure to remain in neutral

🛠️ Service Notes

• Fill with the oil grade the workshop manual specifies for that gear before it is turned — units are supplied dry and a dry start will wreck the clutch and bearings; get the level right, as over-filling a cone clutch gear causes as much trouble as under-filling it
• Check engine-to-shaft alignment and the condition of the flexible coupling before the gear is bolted up; misalignment is the commonest reason a replacement gear fails again
• Set the shift cable or linkage so the lever reaches full travel and engages fully in both directions and returns cleanly to neutral — partial engagement burns a clutch quickly
• Change the oil after the initial running-in period and then at your scheduled interval, checking it for water and for metal every time
• Do not use the gear to hold the shaft while working on the propeller, and do not let the shaft turn under sail or tow unless the manual for your gear allows it

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21116405 → Supersedes 3582031 → Supersedes 3581740

OEM / Related Numbers

• 3807649 earlier number superseded by this part
• 3818586 earlier number superseded by this part
• 3582031 earlier number superseded by this part
• 3581740 earlier number superseded by this part
• 21116456 - Related oil-cooler kit; not included with the reversing gear

Other-Brand OEM Numbers

• ZF Hurth HS45A-A 2.43:1
• ZF Hurth: HS45A-A, 2.43:1

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging