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

!855 Hydraulics Problem

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Sam M in SC

10-05-2006 13:07:44

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Help . I am losing hydraulic fluid from the reservoir on my 1855 directly into the transmission/differential when my 1855 is running AND when it is off and parked . Any ideas where the leak could be and where to start looking would be appreciated . The hydraulic pump on this tractor is mounted on the outside of the tractor below the operator's platform on the driver's left . I have had this problem on a 1555 which I fixed by the pump arrangement on 1855 is obviously different .

Problem started when I developed a hole in the flexible high pressure hose that takes hydraulic fluid from the pump to the control values that work the hydraulic remotes . This hose goes from the hydraulic pump to the metal pipe/tubing that wraps around the tractor top underneath the operator's seat . The hole was on the bottom of the flexible hose and underneath the platform so the reservoir was basically pumped dry before I knew about the problem . First thing that happened was hydraulics on tractor stopped working when I was cutting hay .

I replaced the hose and refiled the reservoir and used the tractor for a while and parked it . When I came back a few days later the hydraulic fluid was below the bottom of the dip stick . I refilled , used the tractor again , parked it and last weekend checked it again and the fluid was once again below the dip stick . I filled it one more time and just let it sit parked and checked it Sunday and again the fluid was below the bottom of the dip stick . Fluid has to be going into the transmission/ differential .

What are the possible sources of the leak . Obviously pan could have leak but nothing has happened that would damage the pan . Could I have burned up or melted a seal between hydraulic pump and transmission / differential . Any ideas on where and how to check would be appreciated .

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Sam M in SC

10-06-2006 08:12:07

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Re: !855 Hydraulics Problem in reply to Sam M in SC , 10-05-2006 13:07:44

Thanks for the comments guys . My 1855 has the Cat 2 three point hitch if that makes any difference . Shaun's email identified the three possibilities I thought of (although I did not think of the rear axle bearings going bad as the possible cause of a hole ending up in the reservoir pan ) . Question , is there anyway to check whether axle bearing is bad from outside tractor without taking the top off ? I just do not think this is the cause as I have noticed nothing unusual in the way the tractor drives , etc . Second question , can hydraulic oil leak around the o rings on pto when tractor is turned off and parked ? I am actually losing more oil (or I guess at a faster rate ) when the tractor is off than when it is running .

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Shaun Murray

10-06-2006 05:57:31

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Re: !855 Hydraulics Problem in reply to Sam M in SC , 10-05-2006 13:07:44

The hydraulic system on your 1855 is the same as on the White 2-85 which had the same problem. We were told of three different ways that oil could pass into the rear end. The first has been mentioned as the seal on the shaft of the hydraulic pump can harden and allow oil to pass through. This was our problem and you would be surprised the amount of oil that will go past the seal. This is a cheap fix if you pull the pump yourself. The next reason is the o-rings in the PTO unit can allow oil to pass through. This is a little larger job as the PTO unit must be pulled and o-rings put in. Once again, this is not expensive. The final reason that it can pass through is that the bull gears have cut a hold in the bottom of the resevior. This is due to the axle bearings going out. This was already discussed in the forum. The cheapest fix is to check the seal on the pump. I was told that the pump was the least likely of the three,therefore, I fixed the PTO and checked the oil tank, with no luck. So if I had this problem on my 1855, like I did on our White 2-85, I would start with the hydraulic pump.

Shaun Murray

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IanC

10-06-2006 04:38:01

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Re: !855 Hydraulics Problem in reply to Sam M in SC , 10-05-2006 13:07:44

There a couple things I can think of. I think we had a machine come in once where the bearings in the rear end had gone bad and the bull gears had ate a hole in the seperator pan. I think John asked if it was Cat 1 or Cat 2 as I think Cat 1 has internal draft sensing and there is a rod that passes throuh a seal in the pan (I might be confusing 55 closed center with 50 series open center).

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LeroyB

10-05-2006 17:20:10

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Re: !855 Hydraulics Problem in reply to Sam M in SC , 10-05-2006 13:07:44

Just wondering if the pump or any of the hoses coming from it excessive in heat?

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J Schwiebert

10-05-2006 14:09:44

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Re: !855 Hydraulics Problem in reply to Sam M in SC , 10-05-2006 13:07:44

Most common source of the oil transfering is leaking seals on the PTO. Do you have a Cat 2 or 3 three point hitch. When you pull the PTO let it off and see where the leak is comming from. I can think of a few other things to check. J.

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Luke S

10-06-2006 06:23:12

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Re: !855 Hydraulics Problem in reply to J Schwiebert, 10-05-2006 14:09:44

I had this same problem with my 1955. As per john's advice I pulled the PTO out and replaced every seal in it, along with a few other worn parts while I was in there. Put it all back together and it has been fine since. I'd highly recomend buying a parts and a service manual to assist you in this project, I couldn't have done mine with my limited mechanical skills without the help of those manuals and Johns advice.

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