transmission information

jssailem · Jul 25, 2017

Brad. I use the fill tube (also known as the cap with the measuring stick) to access the fluid, check the level and color. To empty the fluid, get a tube to suck the old fluid out.
One option is an extractor pump here are some examples.

There is one sold here on SBO https://shop.sailboatowners.com/prod.php?12519
But currently out of stock.

You stick the tube in and suck the Transmission fluid out. Then pour in new and your off to go. If the fluid in your transmission is clean and does not smell burnt (remove the dip stick and place a drop of the fluid on a clean white surface. If clean - no dark bits floating) your probably ok to go on your trip. Always good to get a known starting place with your boat maintenance.

Jim 5757 · Jul 25, 2017

How do you know if your Hurth is full?
Remove the dipstick & wipe clean. Reinsert it but do not screw it in; then remove again to check the level.
AND...be careful not to drop the metal sealing washer! ( DON'T ASK!)
BTW.. there is a drain plug at the bottom but it's a PITA to get at. Vac pump is the best way and great for engine oil change too.

Stu Jackson · Jul 26, 2017

Transmission Fluid 101 http://c34.org/bbs/index.php/topic,6417.0.html

jssailem · Jul 26, 2017

Brad... How about a picture of your transmission. From where I am sitting, I can't identify it either.

Stu Jackson · Jul 26, 2017

brad minda said:
I thank all of you for the info. but what I need to know is where is the dipstick located on the trans. I cant seem to locate it or I don't know what I am seeing.

It is an 11/16" nut on the top of the transmission, off to the port side of center. It may be hidden under the HX.

JohnVTX · Jul 26, 2017

Look at page 57
http://m.iwabss-limited.co.uk/upload/hurth_manual.pdf

jviss · Jul 26, 2017

Stu,

Stu Jackson said:
Transmission Fluid 101 http://c34.org/bbs/index.php/topic,6417.0.html

none of those links work

jviss · Jul 26, 2017

BTW, 0.44 quarts of ATF.

Stu Jackson · Jul 26, 2017

jviss said:
none of those links work

They do for me [I just tried them] and you don't have to be registered on the forum to read them. Sorry about that jvss.

Anyone else having problems? Please let me know. As many of you know, I post lots of links and rarely have any issues with them. Thanks.

ted W · Jul 26, 2017

I have a universal M25XP with a hurth HBW50. The transmission is slipping. Any advice?

Jim 5757 · Jul 26, 2017

Ted:
Simple answer...probably needs to be rebuilt or replaced.
Make sure the shift lever is moving far enough for full engagement(check the manuals for details). Check the fluid: is it dark or have a burnt smell? Do you see metal particles on your clean rag? If so it's most likely done for. Hard to get parts or find a rebuilder for this old model so most go to replacement mode.
Check my posts for more info...

DaveJ · Jul 27, 2017

Ted, I have the same engine and transmission, and had the same slipping 2 seasons ago. I bought the clutch plate kit and the gasket kit from Basic Power Industries, about $320 US. I have a friend that is an auto mechanic, he rebuilt it and I have had no issues since. The clutch plates were very polished, after only 500 hours on the engine.
Part #s were
ALT316750 - Clutch plate kit for Hurth HBW 5, 50, 100
ALT316801B - Gasket set to Overhaul Hurth HBW 5, 50, 100

njlarry · Jul 27, 2017

Ted you may want to try changing the fluid first. Mine was occasionally slipping too last year. Pulled out old fluid which was very dark, put in new Dextron III and so far ok.
bty on my Hurth a 17 mm socket also works for the drain plug.
Dave, thanks for all the info, I am hoping that I never need it.

jviss · Jul 27, 2017

Thanks to all. So, a 17mm wrench for the fill plug, same size for drain. I read it's 0.44 Qt. of fluid. Anyone know the right size sealing (crush) washer?

dziedzicmj · Jul 27, 2017

Stu Jackson said:
Anyone else having problems

the link works

jviss · Jul 27, 2017

Stu Jackson said:
It is an 11/16" nut on the top of the transmission, off to the port side of center. It may be hidden under the HX.

I think it's actually a 17mm nut; 11/16" will fit, but loosely.

Jim 5757 · Jul 27, 2017

DaveJ, I'd love to know how you're making out with the Alta parts! How many hours do you have on it since the rebuild? Everything I'd heard about them was negative, so I ended up paying twice that amount for an original ZF rebuild kit from Federal Marine. 3 rebuilders I spoke to last year declined the job saying they couldn't get good results with the Alta product. Anyone else care to comment on their experience? I'm hoping I didn't waste extra boat bucks on this...