I have a 2005 T300 turbo high flow 2170 hours. Bought from an equipment rental company in Main/NH last year with 2110 hours. Has been running/working great around my yard. All of a sudden today I lost hydraulic pressure, got an error code 05-15 and message Hydraulic charge pressure in shutdown, and machine shut down. I can restart but there is still no use of hydraulics. If I try to move the machine it somewhat appears to want to move (although weakly) but the tracks appear locked. I checked the hydraulic reservoir and its full. There's no apparant leaks. The drive belt looks fine. Pulled the filter off and it was only half full. It looks as if the pump may have just stopped pumping. Any thoughts on what to check or try would be helpful. Would it be possible for the pump to fail suddenly with no prior warning signs or symptoms? I've been using the machine daily for weeks with no lack of power or anything. Thanks for your thoughts and suggestions.
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I found the serice letter, but it is for A5GV serial numbers, way to new for your machine. Also the predicted fail rate was less then 1%. While I was looking for it, I rememberd last spring I had a T320 loose everthing. The bolt holding the pump pulley on backed off allowing the pulley to spin on the shaft. The is no key just a tight tappered fit. The pump shaft and the pulley had to be replaced. I did not to the repair, the customer had owned the machine for less then a month and the place he bought it from took care of him. Just something eles for you to check. I think that was the first I have seen do that.
first thing I would check and hope for is the belt , just cause it looks good doesn't mean it isn't streched and slipping or the bearing is going out in the pulley allowing slack ----------then I would open the case drain filters and the hydraulic filter and see whats in them , if one or both of the travel motors are going out it will send a mess of particles thru the system and overload the rock filter letting some thru to the charge pressure relief , a piece of trash will either scare it up or get jammed in the relief making it stick , the relief is adjusted with shims and is a little hard to get at on the back side of the Sunstrand --------a worst case serino term I hear alot lately on T series machines is Catastophic Hydarulic Failure , where the travel motor fails and send the trash thru the system like a gaint blender and takes out everything making repair cost more than the valve of the machine , repairs range usually between 10-20 K
Normally when a drive motor takes a digger, the case drain filter will plug up, there is little pressure and it just goes to sump. If the unit has power bob tach, the vavle is bolted to the gear pump out put and will catch any crap and stop working. Replace damaged motor, replace power bob tach vavle, flush hyd system and change the cooler. Give or take $8000, motor alone is right around $4200. That said if a drive motor has failed, all other functions normally work, the motor will tear itself up before enough metal gets in the system to do real damage. This is a little off topic since the OP said there is no hyd leak. Most of the time and it seems to happen more on track machines is when a drive motor hose burst, the unit will can't build charge pressure and will render the machine useless.
7LBSSMALLIE
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the loss of lift and tilt along with drive. leads me to suspect a spun hydrostatacit input drive pulley.
Update; I've had bobcat service out twice. With a mechnical pressure guage the sytem checks out perfect. The first service call suspected a dirty connection to the main control unit. Cleaned up the connections and the machine ran perfect for about a half hour. Then got the hydraulic charge pressure low warning again. Second service call suspected the hyrdaulic pressure sensor. Replaced the sensor and machine ran perfect for about a half hour again. Now right back to the same hydraulic charge pressure low warning. I've noticed that the hydraulic fluid in the level window is extremely foamy and the fluid is overflowing out the breather cap. The fluid level is at the correct level. Any thoughts? Thanks.
I have never seen a T300 airate the hydraulic fluid to the point it soming out the filler. If there is that much air in the system, it should be noisey as all holy hell. The only thing I think of is its sucking air on the suction hose. If your dealer has been out there twice and hasn't fixed it yet, it is their baby now.
Thanks Bobcatdan, When you say the suction hose is that just the return side of the hydraulic system or am I looking for a specific hose? If it is sucking air in on the suction hose would it possibly weep or leak out when the machine is not running? If so I could look for a wet area. The machine/hydraulics are not noisy. What do you mean when you say "Its their baby now"? If they don't fix it after two service calls do I get some sort of a discount? Here's for hoping
There is a large hose that goes from the sump to the inlet on the pump, looks like a radiator hose, low pressure, held on by hose clamps. It could maybe somehow rubbed or the clamps are a little loose. When I say its their baby. If I get called out a second time to fix something I didn't fix the first time, it would be classifed as service rework and I would eat it. Two tries in the field and still this way, they should come and get and fix it right. With the machine being non functional, they should be bending over backwards to make it right. Now I'm not saying if it comes to a major $5000 repair that they should pay every last dime, but they should not keep charging you full price for fixing the same problem over and over. We warranity our work for one year.Thanks Bobcatdan, When you say the suction hose is that just the return side of the hydraulic system or am I looking for a specific hose? If it is sucking air in on the suction hose would it possibly weep or leak out when the machine is not running? If so I could look for a wet area. The machine/hydraulics are not noisy. What do you mean when you say "Its their baby now"? If they don't fix it after two service calls do I get some sort of a discount? Here's for hoping
Thanks again. I did a check of all the hoses inside and out. Found one split hose. Not a definative leak but there was residue in the area that would lead me to think it was weeping. It was the back end of the main lift cylinder. I'm going to get it replaced tomorrow and hope it is the culprit. I checked the low pressure hose but could see nothing leaking there. If I have to call service back I'll ask what there policy is on multiple call backs for the same issue. Thanks.
maybe what is happening is that charge pressure is coming and going , the relief for the charge pressure is on the back side of the sunstrand pump in the middle , it is not externally adjustable , it has to be shimmed to adjust , I think it is a 1 1/2 inch hex head which covers the relief , I have seen the plunger get scares on it and stick , the first time pulling the plunger out is a little tricky , but it is really not that bad , be sure to put a clean rag under it so if you drop anything it doesn't get lost ------------ do you have deluxe instrumentation , if so you can monitor the charge pressure will it is running , if not it is easy to tee a gauge and a long hose to charge pressure and route it into the cab , this can help you to isolate the problem , I do believe that if the brake pack of the travel motor is bad that charge pressure can be lost thru it I doubt thats your problem as it seems to come and go , or charge pressure is really always there but the system doesn't reconize because of a sensor or wiring issue
IN my experience I would recommend that you first complete pressure testing at all points within the system(s) both hydrualic and hydrostatic.. This can help narrow down what ares of the system(S) to look at first. if your losing pressure at some point..start to ask WHY am I looking pressure? then start to break down the systems point by point untilll U find the culpret thats creating the loss's. its time consuming I know but alteast when your done U know what u have. Further check your filters including inline canisters. You would be suprised on how little of obstruction it cna take to create a low pressuyre situatrion due from loss of flow rate. onelast note..check your control coils on the spools for proper voltage. IF your not getting such you wil experience a sghut down on pressure which inevitably affect the entire system. If your experiencing voltage drop(s) then thats an indication of either a bad ground or dirty contacts either on ther fuse terminals or connection points someplace. YTou can compinsate for the bad ground by testing your connection piints with a redundant ground setup...this will help you to narrow down any potential groound loss also at same time. I just went thru this same situation on my t300 and this is what I ended up doing to find the root of the problem(s) i incurred. Good luck =)
Sorry for all the typos..I should really keep my contact lenses in when I type lol
Zorack
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His last post was last May,he never did post again to say if he ever had it fixed or what the true culprit was....
Salbendidi
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I'd love to know what the issue was. Please post back.
