Confused ...... a Hydro 1872 question
 

Model 1872

I just drained ( 3/8 square plug and removed rear cover) the hydro assy.

wiped clean the inside of the rear axle housing , installed new gasket and

bolted cover back on , re-installed drain plug.

Refilled 7 quarts of Hy-Tran into the fill / dipstick tube.

Started tractor allowed for a min of warm up , ( rear wheels off ground)

slowly moved hydrostat lever forward , straining sound in pump , moved

lever back to "neutral" , straining sound stopped , moved slowly to reverse ,

straining sound again. Shut tractor down , no leaks , oil is a proper level on

dipstick.

What am I missing ? ? Tractor ran great and drove good prior to drain

and fill. Thanks for the assistance !

Did you change the Hydro Filter...???

:bigthink:

Sounds like it is air locked. Try rotating the rear tires after you put the directional control lever in forward.

If the filter was changed, what filter was used? A few years ago someone found a rag left in the rear after the service was done.

Yes I did change the filter. I don’t remember the number right now , but’s it’s a Baldwin filter , we are a Baldwin , Donaldson , and Racor distributor. So I have plenty of confidence in the proper filter cross.

This is the list of filters that work.
Cub Cadet 923-3014
NAPA 1410
Wix 51410
Fleetgard HF6096
Baldwin BT8486

Yea the Cub # crossed to the Baldwin BT 8486 that’s what I installed.

Was there any issue before doing this? Or was this purely maintenance?

The tractor was running and driving just fine. I was merely doing some long over due maintenance as the hyd oil was looking poorly , just dirty , no water inclusion.
I drained the bottom plug , removed rear diff cover , drained. Changed filter , refilled with Hy Tran.

Then upon restart ..... no love

Did you prefill the filter , (airlock maybe)
Oz

With it not running, try partially un-screwing the filter to purge the air from the pick up tube, then tighten filter back up once fluid comes out and try it again. If it still wont prime you will have to fill the filter with fluid before installation.

Ill loosen the filter tomorrow when I get back to it. And see what happens.

Pretty tough to fill a horizontal filter ......

Thanks to all! I’ll keep y’all posted.

I typically fill the filter before installation on everything including my vehicles. On horizontal installations I fill the filter and let the oil soak in to the element. Then I start rotating the filter as I turn it to the horizontal position and screw it on with little loss. If you have to take the filter off to fill it you will loose several quarts so be sure to place a clean oil drain pan under it for re-installation of oil.

Try this, raise the front wheels off the ground and start the tractor, then start turning the steering wheel to full left and right. It will allow the air to purge out through the steering valve through the return line. Sometimes when I change the hydraulic filters on some of our older 66 series farm tractors that is the only way to get the pump to prime up. I had this happen once to one of my hydro cubs and it worked for me.

The filter is on the suction side, unscrewing it will only suck more air into the system.
Wrap a rag around an air hose and introduce a pound or two into the system through the fill hole, thus helping to prime the system with oil under a slight pressure.
Careful as you don't want to use a large amount of pressure, just a couple of pounds.
BTDT works well.:beerchug:

I would also check and make sure you didn't do something to the suction tube that is near the drain plug.

You don't have it running when you loosen the filter to purge the air from the suction line. The fluid level is above the the filter so it will purge the air out.

Must have needed to purge air out, got to the shop today and all is good , everything works as normal and sounds good!

Thanks to all for your helpful ideas!

Glad it worked out for the best for you. Looks like gravity finally did its job and filled the filter. It is always a concern when something like this happens.