I am new to this forum and have a repair shop. I mainly work on farm equipment but I have this skid steer that I told the customer I would look at because I assumed that it was a chain problem before he dropped it off. He said that a hose blew on the loader and he lost all hydraulic oil. He replaced the hose and refilled it with oil and used it for about 30 minutes and then the right drive motor quit working. I checked the chains and it all looks good in there. I connected a pressure gauge to the brake on both left and right drive motors one at a time and the pressure was just under 450 lbs. At this point without any guidance, I am stuck. Any help on figuring this out would really be appreciated.
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Cat 252b right drive motor won't move
- Thread starter RMMW
- Start date
Nige
Senior Member
Can you please post a Serial Number. Too many options of 252B out there to go guessing.
If the customer blew a hose and did not go through some sort of air bleeding procedure after replacing it and refilling the tank with oil he may have trashed a pump or a drive motor.
Was the blown hose you mention on the RH side motor by any chance.?
If the customer blew a hose and did not go through some sort of air bleeding procedure after replacing it and refilling the tank with oil he may have trashed a pump or a drive motor.
Was the blown hose you mention on the RH side motor by any chance.?
Nige
Senior Member
That is not good. Prepare for the worst. This could turn out to be an extremely costly lesson for the customer.
So it is a 252B3. Attached the procedure for checking the hydrostat system - when I can get it to upload that is.......
You might be well advised as a first step to remove the hydraulic system filter and cut it open to inspect for the presence of sparklies in significant quantities.
Last edited:
Nige
Senior Member
See above. I managed to upload the testing procedure plus added the suggestion about taking a look in the filter.
Nige
Senior Member
Post a photo of what you found please. Did you squeeze a section of the filter in a vise before looking on the pleats.?
Nige
Senior Member
It certainly sounds that way.
Before condemning the drive motor I'd like some confirmation from someone who works on these machines on a daily basis though.
92U 3406
Senior Member
If there's a speed sensor on the motor, pull it out and check it. Its magnetic so if the motor has piled up you will likely see chunks stuck to it.
There is no speed sensor on this motor. Also, there is nobody even remotely close to me that could look at it. Our closest dealer is 2 hour drive in either direction. I'll pull the drive motor out tomorrow and take it apart to see if I can find some internal damage. I will report back tomorrow. Thanks for all your help!
Nige
Senior Member
Check the attachment. There is not much in the way of parts available for that motor. If it's not listed - it's not available as a spare part.
Another clue that popped up in a search is that there is no D&A procedure for the motor, no specifications, and no Reman motor. All of those are indications that attempting to repair motors is not advised because the guts will probably be trashed.
I just wanted to get on and post back what the results were on this machine. It was the right hydraulic drive motor. I was able to get a used one and put in it and it works like it should. Thanks for all your help on figuring this machine out.
Nige
Senior Member
Unfortunately the customer has had an expensive lesson that if you blow a hose on a machine like this you shut the machine down immediately if not sooner. I'd say it's almost guaranteed that the motor ran without oil. I don't want to be a jinx but what's the chance the motor on the other side is not far behind it.?
Have you suggested an oil and filter change to the customer say 30-50 hours after putting the machine back to work, along with cutting the removed filter to see what sparklies are still circulating in the system.? Based on experience I think it's pretty well guaranteed you didn't get them all.
Have you suggested an oil and filter change to the customer say 30-50 hours after putting the machine back to work, along with cutting the removed filter to see what sparklies are still circulating in the system.? Based on experience I think it's pretty well guaranteed you didn't get them all.
It wouldn't surprise me if the other side isn't too far behind. I'm sure that I didn't get all of the debris out. I did change the oil and filter. I would run the machine for about an hour and pull the filter and the oil in the filter still had debris in it when I would dump it out. I did it 3 times before it started coming out clear. I will suggest to him we change the oil and filter again after he runs it for a few hours.
92U 3406
Senior Member
I always made a point of pigging all the drive motor lines after a motor failure. Sadly you just can't get it all out of the pump unless you tear it down. Definitely be worth taking Nige's advice and do a fluid/filter change again after putting some hours on it.
Nige
Senior Member
I agree. Not too many shops have access to a sponge gun & projectiles though......