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Old 06-29-2017, 01:25 PM
mspring135 mspring135 is offline
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Join Date: Jun 2017
Boat: 2000 Prostar
Location: Northeast
Posts: 10
ZF Hurth Transmission Rebuild/Replacement

I may be looking at a transmission rebuild/replacement on my HSW 450D transmission. I am thinking about undertaking a rebuild on myself (preferably at the end of the season). I am good with cars and general mechanical/maintenance type jobs, however, I have not worked on transmissions before, so I am a little hesitant. What are the approximate costs and good places to source a replacement? Looking around the prices that I have found varied widely. Also where would be the best place to get a rebuild kit? I'm in the middle of troubleshooting right now so I'll post updates as it goes and if I do in fact take on a rebuild I'll make a DIY thread. Below are the symptoms and steps that I have taken.

Initial symptom: Low speed compared to RPM for a direct drive (2000 rpm - ~10mph, 3000 rpm - 18mph, 4000 rpm - ~30 mph, 4800 rpm - 35mph, all GPS verified)
Suspected cause: Transmission Slipping
Steps Taken:
-Changed fluid, no improvement.
-Swapped with new prop to verify it wasn't a prop issue.
-Checked oil level/color/smell: correct level, looks like used ATF (darker than new but no brown tinge present when put on a white oil absorbent), does not look milky, smells the same as new oil.
-Ran it and monitored temperature, got into the low 100F's. From what I saw in the manual that is below the upper limit.
Next steps:
-Check shifting pressure and verify in spec for the rpm range. (If the shifting pressure is in spec can I still have clutch slippage?)
-I ordered a photo tach (mine is permanently 'borrowed') to verify engine rpm vs. shaft rpm to validate that it is slipping (hoping for a faulty tachometer).
-Cleaning the filter in the transmission (just found out about that little guy).

If the filter is good and the tachometer confirms slipping I think that I will be into a rebuild/new tranny at some point in the near future. If I am missing anything let me know, this is my first direct drive setup and I'm still learning.

Thanks in advance, looking around the forum it seems like a good group!

Last edited by mspring135; 06-29-2017 at 03:50 PM.
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