Alto 316807D ZF & Hurth Marine Transmission Gasket & Seal Kit | ZF 63A, 68A, 63IV, 68IV | Hurth HSW 630

Alto 316807D — ZF & Hurth Marine Transmission Gasket & Seal Kit | ZF 63A / 68A / 63IV / 68IV | Hurth HSW 630A / 630V / 630H

Alto 316807D is a complete gasket and seal kit covering six ZF and Hurth marine transmission and V-drive models. The kit includes all gaskets, seals, and O-rings needed for a full overhaul or seal replacement on ZF 63A, 63IV, 68A, and 68IV units and Hurth HSW 630A, HSW 630V, and HSW 630H units. Alto 316807D is a seal kit only — it does not include friction plates or steel separator plates. Alto Products Corp. is a leading manufacturer of friction materials and transmission rebuild components for marine, automotive, and industrial applications.

Confirm Fitment Before Ordering

Not sure this is the correct seal kit for your transmission or V-drive? Contact us before ordering — have your transmission model designation and serial number ready from the data plate on the unit. Our team can confirm the correct kit for your application by email, text, or live chat.

Part Specifications

• Alto Part Number: 316807D
• Kit Type: Gasket and seal kit — all gaskets, seals, and O-rings
• Kit Contents: Gaskets, seals, O-rings (seal kit only — does not include friction plates or steel separator plates)
• Compatible Transmissions: ZF 63A, ZF 68A, Hurth HSW 630A, Hurth HSW 630H
• Compatible V-Drives: ZF 63IV, ZF 68IV, Hurth HSW 630V
• Vendor: Alto Products Corp.

Application Notes — ZF 63/68 & Hurth HSW 630 Family

• The ZF 63A and ZF 68A are hydraulically actuated marine transmissions. The ZF 63IV and ZF 68IV are the corresponding V-drive variants of the same family. These units are commonly used in inboard marine applications across a wide range of vessel types and engine sizes.
• The Hurth HSW 630A (transmission), HSW 630V (V-drive), and HSW 630H (drop-center transmission) are the Hurth-branded equivalents of the ZF 63/68 family — Hurth marine transmissions were absorbed into the ZF product line and share interchangeable service components in this series.
• Alto 316807D covers all six variants in this family with a single seal kit. Verify your specific model (transmission vs. V-drive, and ZF vs. Hurth designation) from the data plate before ordering.
• This kit includes seal components only. If friction plates are also required for your overhaul, contact us to identify the correct companion friction kit for your specific model.
• Confirm the correct kit against your unit’s serial number and service manual — sub-variants within the 63/68 family may have differences in seal dimensions between production runs.

Related Alto Marine Transmission Kits

• Alto 023801B — Hurth 71C/72C Marine Transmission Gasket & Seal Kit
• Alto 316803VB — Hurth HSW 150 Marine Transmission Overhaul Kit
• Alto 316903VA — Hurth HBW150V Overhaul Kit
• Alto 316907AV — Master Transmission Overhaul Kit

Installation Notes

• Verify transmission or V-drive model and serial number from the data plate before installation — confirm correct seal kit against the unit’s service manual
• Clean all mating surfaces thoroughly before installing new gaskets and seals — residue from old gaskets or sealant will cause leaks
• Lubricate new O-rings and lip seals with clean transmission fluid before installation to prevent tearing during assembly
• Replace all seals and O-rings in the kit regardless of apparent condition — do not reuse original seals during an overhaul
• Torque all fasteners to specification per the ZF 63A/68A or HSW 630 service manual after seal replacement
• Use only the transmission fluid type specified by ZF/Hurth for your specific model when refilling after overhaul

Additional Information

• Vendor: Alto Products Corp.
• Part Number: 316807D
• Kit Contents: Gaskets, seals, O-rings (seal kit only)

Frequently Asked Questions

Q: What transmissions and V-drives does Alto 316807D fit?
A: The 316807D covers ZF 63A and 68A transmissions, ZF 63IV and 68IV V-drives, and Hurth HSW 630A, HSW 630V, and HSW 630H units. Contact us with your model and serial number and we’ll confirm fitment by email, text, or live chat before you order.

Q: Does this kit include friction plates or steel plates?
A: No — Alto 316807D is a gasket and seal kit only. It includes all gaskets, seals, and O-rings but does not include friction plates or steel separator plates. Contact us if you also need the friction kit for your specific model.

Q: What is the difference between ZF and Hurth models in this family?
A: Hurth marine transmissions were absorbed into the ZF product line. The Hurth HSW 630A, 630V, and 630H are the Hurth-branded equivalents of the ZF 63A, 63IV/68IV, and 630H respectively. Service components including this seal kit are interchangeable across both brand designations within this family.

Q: What is the difference between a transmission and a V-drive model?
A: A standard transmission (ZF 63A, 68A, Hurth HSW 630A) provides forward/reverse gear selection for a conventional straight-shaft drivetrain. A V-drive (ZF 63IV, 68IV, Hurth HSW 630V) includes an integrated V-drive gear set that reverses the shaft angle — allowing the engine to be mounted further aft in the hull. The 316807D seal kit covers both configurations.

Q: Is the Alto 316807D a direct OEM replacement?
A: Alto Products Corp. is a widely used OEM-equivalent supplier for marine and automotive transmission rebuild components. Alto seal kits are designed to meet or exceed OEM performance requirements for ZF and Hurth transmissions in normal service conditions.