Alto 316807B Hurth 630 / ZF 63 Series Gasket & Seal Kit | Parallel & Down Angle | Replaces ZF 3312199017

Alto 316807B — Hurth 630 / ZF 63 Series Gasket & Seal Kit | Parallel Shaft & Down Angle | Replaces ZF 3312199017

Alto 316807B is a complete gasket and seal kit for Hurth 630 and ZF 63 Series marine transmissions in parallel shaft and down angle configurations. It replaces OEM reference ZF 3312199017. If your vessel uses a Hurth 630V1 or ZF 63IV V-Drive configuration, see Alto 316807AB instead — the two kits are specific to their respective transmission configurations and are not interchangeable. This kit includes the pump and control valve gasket, all necessary O-rings, input shaft sealing rings, and input and output shaft seals required for a complete gasket and seal service on this transmission. The Hurth 630 and ZF 63 are the same transmission family — ZF acquired Hurth and both brand designations remain in active use. Alto Products Corp. is a leading manufacturer of marine transmission gasket and seal kits for Hurth, ZF, Velvet Drive, and related applications.

Confirm Fitment Before Ordering

Confirm your transmission is a parallel shaft or down angle configuration — not a V-Drive — before ordering. Contact us with your transmission model and serial number and we’ll verify correct application by email, text, or live chat.

Part Specifications

• Alto Part Number: 316807B
• OEM Cross-Reference: ZF 3312199017
• Application: Hurth 630 and ZF 63 Series — parallel shaft and down angle marine transmission
• Kit Contents:
  • Pump and control valve gasket
  • Necessary O-rings
  • Input shaft sealing rings
  • Input shaft seal
  • Output shaft seal
• Also Available: Alto 316807AB — gasket & seal kit for Hurth 630V1 / ZF 63IV V-Drive
• Vendor: Alto Products Corp.

Additional Information

• Vendor: Alto Products Corp.
• Part Number: 316807B
• OEM Cross-Reference: ZF 3312199017
• Kit Contents: Pump & control valve gasket, O-rings, input shaft sealing rings, input & output shaft seals

Installation Notes

Installation should be performed by a qualified marine transmission technician following the applicable Hurth 630 / ZF 63 Series service manual for your specific configuration (parallel shaft or down angle). Replace all gaskets and seals included in this kit during service — reusing previously installed sealing components compromises the integrity of the repair.

Frequently Asked Questions

Q: What OEM part does Alto 316807B replace?
A: Alto 316807B replaces ZF OEM reference 3312199017 for Hurth 630 and ZF 63 Series parallel shaft and down angle transmissions.

Q: What is the difference between Alto 316807B and Alto 316807AB?
A: Alto 316807B is the gasket and seal kit for Hurth 630 and ZF 63 Series parallel shaft and down angle transmissions. Alto 316807AB is the gasket and seal kit for the Hurth 630V1 and ZF 63IV V-Drive transmissions. Confirm your transmission configuration before ordering — the two kits are not interchangeable.

Q: Does Alto 316807B fit both Hurth and ZF branded transmissions?
A: Yes — the Hurth 630 and ZF 63 are the same transmission family. ZF acquired Hurth and continued to supply and support these transmissions under the ZF brand. Alto 316807B covers both brand designations for parallel shaft and down angle configurations.

Q: What is included in the Alto 316807B gasket and seal kit?
A: Alto 316807B includes the pump and control valve gasket, all necessary O-rings, input shaft sealing rings, and input and output shaft seals for the Hurth 630 / ZF 63 Series parallel shaft and down angle transmission.

Q: When should I replace the gaskets and seals on my Hurth 630 or ZF 63 transmission?
A: Replace gaskets and seals any time the transmission is disassembled for service, when external fluid leaks are present at the shaft exits or control block, or when seals are found worn, hardened, or damaged during inspection. Replacing the complete kit during any major service avoids repeat disassembly.