Hurth 630A Repair or Replace

Olysan

Member
Mar 17, 2018
113
Boat Info
1994 400 Express Cruiser
Engines
7.4 MPI
I'm really hoping that someone can give me a decent cost comparison here. I have a '94 400EC with '98 vintage 7.4 MPIs and Hurth 630A Marine Gear. My Starboard 630 is leaking ATF profusely. It's leaking from the filter cover area even after replacing the old filter and o-rings, It also seems to be leaking from both the input and output seals. The unit definitely needs to be pulled and either repaired or replaced. What I'm trying to guage is the cost of repair vs. replace. It looks like I can get a new ZF drop-in 63A unit for ~$2500 delivered. Has anyone purchased one of these units from fredwarner1.net? https://www.fredwarner1.net/product...ransmission-gearbox-hurth-hsw630a-3312001017/
If so are there any gotchas that I need to be aware of?
The other option would be to have the seals replaced on the existing unit. I've been doing tons of research and I can't find a price estimate for this anywhere. Does anyone have any experience with this? What would it cost to have a qualified shop replace the seals on my existing unit.

Thanks in advance for your help.
 
You didn't mention how many hours that you have on the transmissions. Generally speaking.....I don't think it makes any sense to rebuild them over a 1000 hours of use or if the transmission cooler failed. The internal components wear and replacing the clutches and seals does nothing for the actual gears.

As to why fluid is coming out of the transmission.....the first place I would look is the transmission cooler. If compromised, the transmission cooler will then try to pressurize the transmission with raw water creating a mess and forcing fluid out of the transmission.

Make sure you replace the cooler when you change the transmission.

These are the guys I use: https://www.perfprotech.com/new-transmissions/category/6505

Ironically, their rebuilt transmissions are more than the new ones.
 

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