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770 hydraulic problems

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Michael Keefe

02-02-2002 05:49:15




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Working on an Oliver 770 with a TA and some hydraulic problems. The oil leaks somewhere (internally), I assume into the rear-end. I've done an Oliver 88 RC with some success (it was leaking externally from the reservoir).

What am I going to find when I pull the hydraulic pump? Does the TA tie in with the hydraulic system? I have no knowledge of the workings of a TA (this one is broken, doesn't do anything in either position).

Also, if the pump itself is the same as the 88, how hard is it to rebuild the pump? Any good tests to see if it needs rebuilding?

Any info greatly appreciated!
Mike

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Mike in Ohio

02-02-2002 07:13:23




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 Re: 770 hydraulic problems in reply to Michael Keefe, 02-02-2002 05:49:15  
If your hydraulic fluid level is going down, check the quick couplers at the hose ends first. A small leak there can go unnoticed and drain your system before you know it. After that check the fluid level in the rear end. An internal leak will result in a gallon or more extra oil in there. In this case the pump seals are leaking or the center plate is cracked. Get an IT manual to take you through disassembly. If it is the seals the pump bearings should be replaced too. If there is any scoring of the gears or their mating surfaces (most likely there will be) a good machine shop will be able to surface grind all of the parts for you. Make sure they keep everything square, and allow .002 to .003 difference in the thickness between the gears and the center plate. Also, use a fine sharpening stone to remove the burr raised on the edges of the gears by the grinding. This burr will come loose when you start the pump and will weld itself to the gears and side plates and lock up the pump. Don't forget to change the oil in the transmission and rear end as they will be diluted with hydraulic oil. E-mail me if you need any more info.

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ron

02-20-2002 19:02:28




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 Re: Re: 770 hydraulic problems in reply to Mike in Ohio, 02-02-2002 07:13:23  
the problem in the pump probably (80%) the center sector of the pump body. water in oil, goes to the bottom when seperates out of the oil after sitting idle for some time, then jack frost does his majic. the end result is a hairline crack in the mid-section that passes oil out into the rearend under pressure and passes out a worn, or weakened seal. it all adds up to years and wear.



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