Narrow frame hyd lift

athomas · #1 02-16-2023, 04:34 PM

Hoping to find some answers for my 125 hydraulic lift that continues to leak fluid from the driven pulley shaft after resealing several times with 1 seal and 2 seals. The unit will stay dry while sitting on the bench full of fluid, as soon as it is installed and the least bit of belt tension is applied it starts leaking ! It seems to me there is too much deflection in the shaft where it passes through the seal. I have some dimensions with the pic as to my shaft dia's at three areas but what I don't know is the dimensions when new ? Where the short end of the geared shaft goes into the gear cover there is approx .019 clearance between the hole on the cover which measures .504 and the stub end of the gear shaft which measures .485 has anyone run into this issue and a continuous leak and is there a solution ? I am thinking of having the gear cover bored and installing a bronze bushing to tighten up the stub shaft to cover clearance to maybe .0015/.002 in order to stabilize the pulley shaft where it passes through the seal ?? This is on a pretty nice restored 125 and I don't want to keep a drip pan on the footrest !

Ambush · #2 02-16-2023, 05:08 PM

Post a close up pic of the seal area on the shaft. Are there fairly deep grooves or pitting? .004" would not be enough to cause a seal to leak. But that is quite a bit of shaft wear. Bearing must be shot too.

Gary C · #3 02-16-2023, 06:12 PM

Years ago on my Kenmore washing machine, the water pump was leaking. I took it apart, the bronze bushing was worn elliptical, I pulled it out and reinstalled 180 degrees and did the same with the shaft seal, reinstalled and it ran a couple more years without leaking. I had ordered a replacement pump . The replacement was back ordered at the time. With the bushing worn like that from the belt pulling it sideways it leaked, by turning the bushing, it straightened out the shaft, no leaks.

darkminion_17 · #4 02-16-2023, 06:25 PM

I had the same problem, ended up putting the belt on as loose I could.
Did you follow Paul Funks pump repair?

https://cubcadetman.com/cc/how-tos/h...draulic-pumps/

athomas · #5 02-16-2023, 08:56 PM

Quote:

Originally Posted by Ambush

Post a close up pic of the seal area on the shaft. Are there fairly deep grooves or pitting? .004" would not be enough to cause a seal to leak. But that is quite a bit of shaft wear. Bearing must be shot too.

The seal area wear is very minimal ,as far as a bearing the only bushing I see is on the idler gear There is no bearing /bushing on the pulley shaft that I see on mine ? but that is what it seems like it needs ! should the pulley gear shaft be .500 it's entire length ?

Ambush · #6 02-16-2023, 09:04 PM

Yes, it should be .500” all the way. Use the pulley end of the shaft to check the bores for wear and out of round. It would be expensive to bore them for bearings /bushings. If the bores are not bad maybe try to find a good gear set.

athomas · #7 02-16-2023, 09:14 PM

Quote:

Originally Posted by darkminion_17

I had the same problem, ended up putting the belt on as loose I could.
Did you follow Paul Funks pump repair?

https://cubcadetman.com/cc/how-tos/h...draulic-pumps/

Lou, that is the procedure I used when I first rebuilt this a couple years ago and have had the nagging leak ever since ( don't know if it leaked before I owned it or not ) I readdressed the leak a couple days ago and as long as you don't put a belt on it's great ! Looking at some pics of new shafts it appears the stub end of the pulley shaft is worn ( .485 ) dia. I believe this shaft was once .500 it's entire length . If I put the pulley fit end into the gear cover the play is very minimal as the bore in the cover is .504 and the pulley end of the shaft is .500 I think a new shaft is needed or I have a machinist bore the cover and insert a bushing to accommodate the worn end of the shaft , I can get a new shaft but if I ruin the gear cover that is a whole different story !

athomas · #8 02-16-2023, 09:18 PM

Quote:

Originally Posted by Ambush

Yes, it should be .500” all the way. Use the pulley end of the shaft to check the bores for wear and out of round. It would be expensive to bore them for bearings /bushings. If the bores are not bad maybe try to find a good gear set.

I thought it should have been .500 the entire length, the pulley end fits much better in the cover bore ! cc specialties has new gear sets and shafts also available !