hydro pump

Vince_o · #1 10-09-2012, 11:32 AM

I thought Id take a min to post some pics of a hydro pump that Im doing in the shop. This one is a hydro gear but the parts are all the same on our old ones. Basicly if you ever tear into one this is what you dont want to see.

Just thought Id post some pics cause some say I dont like to help people,

The unit will run good for about 15 min then it lost power. Let it sit and it will run again. First thing I did was to cut the filter open to see if there was any metal in it. As soon as I say that I know it was time to order a new pump. I learned this from the guys at cat, quick dignoses for the customer.

Enjoy!

Vince_o · #2 10-09-2012, 11:34 AM

Everything should be smooth. The bearing cage came apart, causing the failure.

Vince_o · #3 10-09-2012, 11:37 AM

All hydros have the same componits no mater who makes it. I thought if youve never been into one someone might like to see one from the inside.

Now on some of the 2000 modle cubs the big box store hydro only has like 7 pistons where the dealer ones have 9, that make for beter control of your hydro stat.

ajcombs · #4 10-09-2012, 12:34 PM

Too cool Vince thanks!

ACecil · #5 10-09-2012, 01:32 PM

Thanks for sharing, Vince!

Sam Mac · #6 10-09-2012, 05:19 PM

Yep don't change the oil and filter till it craps out. Looks like the charge pump and piston pump are junk. I always cut filters open and look to see if I have a problem on every used Cub I pick up. Learned that trick from my race car engine builder. For you guys that don't have a cutter try Summit Racing or Jegs, best $30 or $40 bucks you will ever spend on a tool. Hydros are almost bullit proof but they need clean cool oil. Running one for 500 hours considering that we only put 50 or so hours a year on them is just plain stupid. Change the oil and filter every 2 years and you will be $$$$$ ahead.

324matt · #7 10-09-2012, 05:59 PM

Well, What do you think of this then? I disassembled my old red 782 this week. It had about 1250hrs on it, and had a tired KT17 series 1, and would run good for 15min, then loose power. It used as much oil as fuel, and then the rear end started to leak. So, needing a winter project I decided to do a full restoration on it. I pulled off the rear cover, and the top inspection cover from the rear end today and found burnt stinking fluid, and lots and lots of metal shavings and chunks in the rear end.

note how dirty the hydro pump was in the pics.

I your opinions, Do you think the hydro pump could be smoked? Can they be rebuilt?

Can I get new guts for the rear end?

Look at the pics and see what you think. I have no idea yet what broke, but something is in pieces inside there.

324matt · #8 10-09-2012, 06:29 PM

here are some pics of the filter. there was some metal shavings inside the filter, but not in the paper.

Vince_o · #9 10-09-2012, 09:08 PM

The green stuff in the case is moisture trapped by the hytran oil. When you look at the paper, put the paper in a vise and squeze the oil out of it. Then you will see the metal.

EricR · #10 10-09-2012, 10:53 PM

Thanks for the write-up and pics Vince