Hello Friends
 My military D7E has started leaking oil profusely from the front of the winch/back of tractor.
it runs down the tractor between the winch and the mounting plates of the cat.
i can’t see where it’s coming from but it comes out in multiple spots.
does this sound like the PTO shaft seal?  How hard is it to fix and are these seals still available?
thanks in advance.

Somewhere I read online that a blown hose inside the unit can force fluid out also but I’m not sure where.  I will take the covers off tomorrow and check that out,

This unit is a 1965 75E3 serial number military cat with relatively low hours 6-7k according to records.


     

The hyd. pump for the winch runs off the back of the flywheel housing so pull up the floorboards and check the hoses going to the winch.
Bob

Hello Drew, That's a very nice looking D7E. I can't be of any help on your Hyster D7H winch problem. I downloaded some of your pics so I could magnify them. I noticed that your picture of the underside showing the diagonal brace there was no sign of the dead-axle bearings being greased lately. I hope that I'm mistaken; please don't be offended, but those bearings should be greased every 10 hours of operation or very expensive damage will occur. 
We have a lot of manuals and other info on D7Es in the ACMOC library, but you have to be a paying member to access them.
I found a Operation and Maintenance Instructions(OMI) on eBay:
www.ebay.com/itm/266345386272
This manual will save you time and money.
Craig
 

seiscat wrote:

Hello Drew, That's a very nice looking D7E. I can't be of any help on your Hyster D7H winch problem. I downloaded some of your pics so I could magnify them. I noticed that your picture of the underside showing the diagonal brace there was no sign of the dead-axle bearings being greased lately. I hope that I'm mistaken; please don't be offended, but those bearings should be greased every 10 hours of operation or very expensive damage will occur. 
We have a lot of manuals and other info on D7Es in the ACMOC library, but you have to be a paying member to access them.
I found a Operation and Maintenance Instructions(OMI) on eBay:
www.ebay.com/itm/266345386272
This manual will save you time and money.
Craig

That’s a good catch on that bushing needing grease.  I did just grease it before I used it but it should probably get some more.  I use this machine about 25 hours a year for the last 7 years that I have had it so it doesn’t get used a lot.  It’s pretty much in retirement out on my farm with just enough use to keep it strong.  I’ll call hyster on Monday and get some advice on that winch leaking…hope it’s not too bad to pull it off.
thanks again!
 

I get a kick out of home owners that want to go for the most expensive fix rather than checking the inexpensive easy stuff first..
Check the hyd hose that goes into the box on top of the winch, where the control cables go in .
Bob

bluox wrote:

I get a kick out of home owners that want to go for the most expensive fix rather than checking the inexpensive easy stuff first..
Check the hyd hose that goes into the box on top of the winch, where the control cables go in .
Bob




 
Im not a homeowner I’m a construction contractor doing millions of dollars of work every year.  I just dont specialize in antique bulldozers or their mechanical operations.  I OBVIOUSLY checked all the lines under the seat first.  It’s not leaking from any hoses unless they are internal and pumping it out the shaft seal somehow.

 

Does seem like PTO shaft sealing would be the likely leak candidate or possibly one of the through bolt holes is missing cork seal.
www.alliedsystems.com/pdf/Winch/Manuals/599197W.pdf
 

Thanks OM, would you mind if I could see about adding this to our library?
Craig

Anything on here is game for the Library.... Along with the Allied website for other winches.

You know since you don't even know how the clutches on a PC winch works and apparently can't read a parts book we can lump you in the home owner class.
If the pinon seal leaks on that winch it passes oil into the tub on the tractor.
On the other hand when the oil supply hose leaks oil runs down the front of the winch.
Bob