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1835b Uniloader Questions

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skeeffer

09-30-2005 19:02:15




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I posted this in the 'crawler, dozer, loader' section, and haven't gotten much response - I thought I would try it here. The drive train on my mid 80's Case 1835B gas Uniloader has just started acting up. The symptoms are only on the left side and in the forward direction. At an idle, the wheels on the left side will not go forward, but will go in reverse, the right side will go both ways. At full throttle, when the left lever is inched forward, the wheels will either not move or move real slow for a few seconds, and then they will lurch forward, after which things seem to work fine for a while until I stop or change directions, and then the whole process may start all over agian. The machine will do it when the oil is hot or cold, and the syptoms do not change with operating tempature. I talked to a couple of hydro shops, and one suggested swapping the relief valves to see if the problem showed up some where else - I tryed that and it didn't work. I am assuming the fact that the problem is only on one side, and in one direction would be a big clue to someone smarter than me. I was hoping someone out there may have some ideas - I really don't want to take the machine to the hydro shop for fear the bill will exceed the value of the skid steer.

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TomVAC

10-01-2005 14:05:00




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 Re: 1835b Uniloader Questions in reply to skeeffer, 09-30-2005 19:02:15  
I know this sounds stupid but is your park brake partially on? Years ago i worked on these and the brake pin would not retract sometimes. It would make some noise if this is whats happening. If i remember you can pull off a cover over the chain drive and peak at this. This has different pumps then the 1830. also check control linkages.



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skeeffer

10-01-2005 19:07:06




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 Re: 1835b Uniloader Questions in reply to TomVAC, 10-01-2005 14:05:00  
The park brake has never worked since I have had the machine - It looks like a big pin that engages some blind holes in one of the drive sprockets - I have always kept the lever in 'neutral' to avoid any surprises if it ever started to work.



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Tom (Ks)

09-30-2005 19:57:05




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 Re: 1835b Uniloader Questions in reply to skeeffer, 09-30-2005 19:02:15  
If the 1835 is like the 1830 loader, to have a problem only in one direction, it could be the "charge circuit check valve" in the left hand pump. There are two of these valves on each pump. One forward and one for reverse. On the 1830 and 1840's you have remove the pumps and take the end cap off to inspect the valves. Cessna No.70442 pumps and 70142 pumps.



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skeeffer

10-01-2005 07:30:57




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 Re: 1835b Uniloader Questions in reply to Tom (Ks), 09-30-2005 19:57:05  
My pump is a Sperry Vickers - There are two pumps, one for the left and one for the right with a valve block in between the two pumps. In this valve block, there are pressure relief valves for each side and each direction (a total of four). I swapped them around in different spots hoping the symptoms would move to different side or direction, but everything stayed the same. I am the first to admit I don't know much about these systems, but it seems that since the problem is in only one direction, the actual 'pump' and 'motor' may be ok, and the problem is in the fluid flow. According to my service and part manuals, there is a wear plate on the pump that sits against the valve body, and the cylinder block rides on the other side - I,m guessing maybe that wear plate is worn out and letting fluid leak by. It may also be in the motor - I have studied the manual diagrams, and have not quite figured out how the fluid gets to where it needs to go in there - thinking if I tore it apart it will make sense, and maybe find something suspicious.

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Tom (Ks)

10-01-2005 14:12:28




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 Re: 1835b Uniloader Questions in reply to skeeffer, 10-01-2005 07:30:57  
The only thing I have on Vickers was on the early 1816's. They had a "soft ride" valve next to the main relief valve. The motor and pump should be good if you can go thr other direction, so the problem would allmost have to be in the area around the check valves. On the Cessna units, a bad charge circuit check would let the oil go back to the charge pump and the relief valve would open up back to the filter.

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skeeffer

10-01-2005 19:03:19




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 Re: 1835b Uniloader Questions in reply to Tom (Ks), 10-01-2005 14:12:28  
There is only one check valve for the charge pump - I would think if that was the problem, the syptoms would show up on both sides and in both directions. I was running the machine today, and i noticed the left side seems to 'free wheel' in reverse - when I move the right lever to go backwards, and leave the left lever alone - the machine goes straight back, instead of pivoting around the left wheels. It will pivot around the right wheels when the left lever is moved back.

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Tom (Ks)

10-01-2005 20:58:37




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 Re: 1835b Uniloader Questions in reply to skeeffer, 10-01-2005 19:03:19  
You are right about a single valve (check or relief) effecting both directions. Without flowtesting the machine, I would look at a drive motor first. It might be the least amount of work to remove. I had a note in my book about rotor and roller clearance in the drive motor.



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skeeffer

10-02-2005 18:34:28




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 Re: 1835b Uniloader Questions in reply to Tom (Ks), 10-01-2005 20:58:37  
I think the drive motors are Cessnas. Case doesn't sell them any more and they have a new part number for a motor that is supposedly more 'robust'. They have to be replaced in pairs, and the price is robust as well - $1,600 a piece. My internet/ebay research has led me to believe that a Ross motor may be the replacement. I have been looking at my service manual trying to figure out how the motor works. The oil enters the motor in the front (where the shaft comes out), but it looks like all the action is on the other end. I don't see any passageways for the oil to get to the other end other than to run through the bolt holes along side the bolts. The photos of the end cap show a couple of holes where oil can come out - one for forward and one for reverse I am assuming. In that end cap, it shows what they are calling a spool valve that I am assuming moves back and forth with either forward or reverse pressure from the pump. I am wondering if that may be the problem. I am not sure how soon I am going to tear into this project - I am still using the machine and getting by - hoping continuing use won't cause some type of additional damage. Looks like a winter spring project.

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Tom (Ks)

10-02-2005 20:44:53




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 Re: 1835b Uniloader Questions in reply to skeeffer, 10-02-2005 18:34:28  
On any hydrulic motor I have seen, there are two large hoses. Forward and reverse is nothing more than having the flow to the motor go the opposite direction. A small third line is the case drain line to get rid of any leakage in the motor. The pictures in my book do not show any valves in the drive motor.



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