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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum

Missing Hyd oil

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alberta dave

04-12-2004 08:11:49

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I had a cracked hydraulic hose and bad o-ring on the hydraulic flow control valves under my 1850's seat for most of the winter. I changed them out last month and added about 10 L to the hydraulic tank thinking I would be good for a couple of months, but noooo... I have added yet another 15 liters of hyd oil in the past two weeks and I can not find a significant leak to account for the fluid loss. Can Hyd oil leak into the transmission gear box if a shaft seal has failed? I had thought that the pan under the pump would prevent any hyd oil from getting into the gearbox but I am running out of places to look. I even rode in the bucket while my wife drove to see if I could spot a leak from the streering mechanisum. Nothing but normal seeps and drips common for a 35 year old tractor underneath.

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hardscrabble

04-12-2004 19:03:17

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Re: Missing Hyd oil in reply to alberta dave, 04-12-2004 08:11:49

Neighbor had an 1800 with the same problem. Rear axle bearing had gone out, and the bull gear wore a hole in the resevoir.

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Wayne

04-12-2004 16:20:08

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Re: Missing Hyd oil in reply to alberta dave, 04-12-2004 08:11:49

All you have to is check your transmission oil and see if it is over full. If it is bingo you know where it went.

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Sam M

04-12-2004 11:14:43

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Re: Missing Hyd oil in reply to alberta dave, 04-12-2004 08:11:49

I had this problem on a 1555 which I believe is set up the same as the 1850 . Three possible causes : (1) hole in the hydraulic oil pan ; (2) breakdown in gasket which seals the pan to the top - there is an area in front of hydraulic oil filter but before gear shift where a bad gasket could allow hydraulic oil to leak from reservoir into the transmission ; (3) bad front seal on hydraulic pump . You drain the gear oil for the transmission and rear end on this tractor in two places , (1) a recessed pipe plug (1/2 drive ratchet with no socket will fit in plug ) underneath the transmission right beside the pipe plug which allows removal of the screen to the transmission oil pump and (2) a recessed pipe plug underneath the rear end . If I recall correctly the plug under the rearend is directly above the draw bar so you have to swing the draw bar right or left to get to this plug . Remove both plugs and drain the fluid from the transmission and rear and and I am pretty sure you are going to have both hydraulic fluid and gear oil mixed together . I would have several five gallon buckets ready because if hydraulic fluid is mixed with gear oil in the transmission and rear end you are going to have a lot of fluid there .

A guick way to test which of the three causes it MIGHT be is to leave the plugs out , put clean buckets underneath each plug hole and then add some hydraulic fluid . If fluid leaks into the front bucket underneath the transmission , it is more likely a bad gasket or the front seal on the hydraulic pump . If fluid leaks out of the rear hole (under the rear end ) it is more likely a hole in the hydraulic oil pan . If you get no leaks with the tractor off , it is most likely a bad seal in the hydraulic pump which is only leaking when the pump is turning . ( However , on my 1555 the leak was the seal on the hydraulic pump but it was slow leaking when the tractor was off , not when it was on - go figure that one ) . My guess is you are going to have to take the top of to figure out and correct the problem .

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alberta dave

04-13-2004 06:18:18

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Re: Re: Missing Hyd oil in reply to Sam M , 04-12-2004 11:14:43

Thanks for the comments, I will tackle this over the weekend and post results.

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04-12-2004 14:26:10

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Re: Re: Missing Hyd oil in reply to Sam M , 04-12-2004 11:14:43

Sam 1750 series and up if equipped with a 3 point have the dashpot rod as Larry suggested. 1550, 1600 and their replacements do not use that set up.

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Larry from MD

04-12-2004 08:49:26

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Re: Missing Hyd oil in reply to alberta dave, 04-12-2004 08:11:49

Yes hydrolic oil can get into the rear.It can leak out the pump seal or through a crack in the pan or the seal if you have the dashpot push rod through the pan.open the filler leval plug on the rear to find your oil.

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