Hi gang, I have a JD 644-B wheeled loader. Recently she has developed some issues, primarily that once fired up, it will either move in rev or forward for a while then it will become sluggish and after another gear shifting it will no longer move. This will last for a day or so. Sometimes it will not engage at all upon cranking it. I have changed the filters. I am having no luck finding what the culprit is. any help would be greatly appreciated.
Welcome to HEF Aubrey ! The driveshaft between the engine and the transmission spinning when the issue happens? If it is then the next step/steps would be a bunch of pressure checks.
what kind of transmission is it, allison or zf? have you cleaned the intake screen?
hey gang, thank y'all for the speedy answers. I will check the shaft tomorrow. as far as the tranny, I believe it is the Allison. I read that around the time of our machine's production, they changed transmissions and my luck is I have the bad one lol.
Oh, nothing wrong with either one, both are very simple design and almost bulletproof.
Like Fast_st said, check the suction screen. Also post the machine serial number if you have it.
yes sir, im about to head out and check now. again thank you all so so so much.
the serial number is 001357 CD