Nige
Senior Member
Allegedly this is NOT for your specific pump, but at least it will give you an idea.
-
Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!
216b skidsteer COMPLETE Hydraulic failure
- Thread starter MiJo
- Start date
Thanks Nige. I really appreciate your help and diagrams. Unfortunately it doesn't look like its an "easy" shaft seal replacement. It's starting to like this is a bit over my skill level. I'm kind of leaning more towards just remove the pump and take it in to CAT for servicing, if they will even do that for me?
Nige
Senior Member
Take some Vaseline with you........
Remember their labour will be north of $150/hr and unless you agree to let them install the "repaired" pump then there would very probably be no warranty on the repair IMO.
They might try to talk you into purchasing a Remanufactured (Reman) pump assembly.
FYI the 289-6340 Pump Gp is now updated (through a couple of iterations) to 398-7470. The Reman for that P/N is 20R-7877 but I don't know whether or not any Part Number earlier than that would be an acceptable Core Return for a Reman pump. If it is not then you end up buying a new pump - $$$$$$$$.
Aftermarket pumps seem to be available. Reman 20R7877 around $4000, new 289-6340 about $4500.
Good grief... Well, I guess I will take that pump out and see what I can figure out. Once I have it out and on the bench I may be able to convince a roaming HD mechanic to assess the situation and see if I can pay him to dig into.
Nige
Senior Member
You think that's expensive. Drive motors for the newer tracked machines are today getting up in price somewhere close to $10k a pop.......!!
Hello. I'm back and have pulled the pump out of the skidsteer and its now sitting on my bench. I have included a few pictures to help describe the situation. It appears that the shaft seal has failed, as there is a noticeable gap, more so on one side then the other, but nonetheless it doesn't look like its a "good seal". The bell housing is full of hydraulic fluid but the nylon ring looks to be in good shape.
My question is where do I go from here? Im really hopefull if I just replace the seal all will be good. But if I have a situation of "high case drain pressure" as was suggested, how does one diagnose that without putting everything back together and starting it up to see if it blows the seal again? As always, any help would br greatly appreciated!
My question is where do I go from here? Im really hopefull if I just replace the seal all will be good. But if I have a situation of "high case drain pressure" as was suggested, how does one diagnose that without putting everything back together and starting it up to see if it blows the seal again? As always, any help would br greatly appreciated!
Nige
Senior Member
How did it get rusty like that.? Chain case full of water.?
Nige
Senior Member
Each chain case supposedly has around 1.6 gallons of oil in it. Did you drain about that much from it before you removed the drive motor.?
Have you inspected the condition of the chaincase breathers.?
heymccall
Senior Member
Nige, you're in the right church, wrong pew.
That housing and input shaft are the engine bellhousing and pump input shaft.
That housing and input shaft are the engine bellhousing and pump input shaft.
heymccall
Senior Member
How many hours on this contraption?
Was the hydraulic filter changed at normal intervals? Restricted filter can cause that.
What grade hydraulic oil is in there? Too heavy grade of oil can cause that in colder weather?
Could the drain hose be compromised (crushed)?
Was the hydraulic filter changed at normal intervals? Restricted filter can cause that.
What grade hydraulic oil is in there? Too heavy grade of oil can cause that in colder weather?
Could the drain hose be compromised (crushed)?
Nige
Senior Member
Good point. I had the drive motor in my mind somehow.
Although its a 2006 skidsteer it only has 439hrs on it of light use around the acreage. I inspected the filter and it didn't seem bad. Hydraulic oil was typical SAE10W hydraulic oil. I never examined the drain hose thoroughly. I will certainly give that a look.
Mobiltech
Senior Member
That seal has definitely seen high back pressure to roll it out like that. I would check the case drain line for obstructions and if that all looks good I would certainly inspect the inside of the pump.
Maybe try to find a hydraulic shop that specializes in pump repair because the chances of them knowing what they are doing is better than some random cat dealer mechanic. That is if the dealer doesn’t have a hydraulic rebuild specialist.
Maybe try to find a hydraulic shop that specializes in pump repair because the chances of them knowing what they are doing is better than some random cat dealer mechanic. That is if the dealer doesn’t have a hydraulic rebuild specialist.
As I don't know where the "case drain line" is on this machine, I was hoping you guys could point me in the right direction to purchase a shop manual for my unit. I can find several places selling them on-line but I want to be sure Im getting one that's worth its salt.
heymccall
Senior Member
The port in the first picture is where the case drain hose connects to the pumps..
Unfortunately, the ports in the second image can only be tested while operating.
2nd pic
Unfortunately, the ports in the second image can only be tested while operating.
2nd pic