CATT 299D XHP No Hydraulics

S.Fox · 2026-05-14T20:25:32.000Z

CAT0299DAJST01268 Give the information I can so maybe this will help other also if can figure it out. Lost all hydraulics while working. When it happened was moving some items with grapple and machine came to a stop. No movement forward or backward. For a minute I had a enough hydraulics to release the grapple and it lifted very slow and went down then would not raise again. Items checked and the work preformed so far. Fan not turning when engine running. Check to make sure Fan was not locked up it is good. When ahead and checked and changed hydraulic filter.( old one did not look bad. All research I did pointed to the coupler. So ordered couple and had a mechanic come out and pulled the engine. NOPE coupler was not bad changed it anyway. Also put the old coupler on the pump while engine was out and trund it. Was not free spinning had some resistance. Put all back together and tried again still nothing. Separated the two pumps. I turned the engine with a ratchet while he tried to hold the enter splins with a large screwdriver nope could not hold it. (Possibly telling me that shaft may not be broke) turned the back shaft with pliers and had some resistance and did not feel broke. Myself and the mechanic are both lost need some help.

Started by S.FoxMay 14, 202626 replies

cat262cNew MemberJun 30, 2026#21
thats what i was thinking also.. Serial-CAT0262CCMST00261 Thanks for the Help..
NigeLegendJun 30, 2026#22
Well apart from the person who started this thread (who unfortunately never came back to update us on what the actual problem was on his machine) I know of no other case of a machine with no drive, implements, or fan where the cause was NOT something related to the coupling. You need Ref #2 on the attachment. While you have everything apart check the splined connector on the drive pump. Sometimes the bolt #3 can come loose and the connector #5 slides away from the coupler. Unsurprisingly this also results in no drive, implements, or fan.
Simon CSuper UserJul 1, 2026#23
Maybe he will reappear with the end repair, but many have slipped away as into the night and never came back. Simon C
ChrissoJunior MemberJul 1, 2026#24
Nige said: Well apart from the person who started this thread (who unfortunately never came back to update us on what the actual problem was on his machine) I know of no other case of a machine with no drive, implements, or fan where the cause was NOT something related to the coupling. Click to expand... Same here. But after hearing that, from now on I’ll keep a broken charge pump in the back of my mind next time I come across it. How good are these forums
cat262cNew MemberJul 1, 2026#25
Nige said: Well apart from the person who started this thread (who unfortunately never came back to update us on what the actual problem was on his machine) I know of no other case of a machine with no drive, implements, or fan where the cause was NOT something related to the coupling. You need Ref #2 on the attachment. While you have everything apart check the splined connector on the drive pump. Sometimes the bolt #3 can come loose and the connector #5 slides away from the coupler. Unsurprisingly this also results in no drive, implements, or fan. View attachment 362511 Click to expand... Thank you! i will keep you posted on what i find..
Jeffc1964New MemberAug 12, 2026#26
I still haven’t fixed my 279c skid steer it stopped traveling forward and reverse and my boom hydraulic would still work but after replacing a coil and cartridge and reconnected the battery I started getting a caution light flashing and now I have no boom movement and still not coming out of park I replaced the rocker switch for the park brake and checked all inner locks and next thing is to load it up and haul it to my local dealer did you ever get yours fixed
Simon CSuper UserAug 12, 2026#27
Jeffc1964 said: I still haven’t fixed my 279c skid steer it stopped traveling forward and reverse and my boom hydraulic would still work but after replacing a coil and cartridge and reconnected the battery I started getting a caution light flashing and now I have no boom movement and still not coming out of park I replaced the rocker switch for the park brake and checked all inner locks and next thing is to load it up and haul it to my local dealer did you ever get yours fixed Click to expand... Why not post a picture of the warning light with maybe a possible solution to follow. Might be an idea to post another thread with " Cat 279C No Forward Reverse " and post your serial number, hours on the machine and everything else that has been done and changed. Do you have a schematic for the machine. More info gets better results back. Simon C

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