sliping

[aokpops]

Hello . I have a 917 A/C hydro that slips when cold . would a fluid an filter change help ? if so what kind of fluid? where do you check the fluid at? Thanks for your time Pops.

[Al]

Pops, After the above another common problem with all of these tractors from the 3300s on up is the front drive pulley on the crossdrive. These pulleys get U shaped instead of V shaped and then slip quite easily, They then drive like a small flat belt in the bottom of the pulley. A V pulley gets its superior ability to transfer power in the fact that when the belt bends around the pulley it squishes out on the sides of the V and wedges against the sides of the pulley. When it comes off of the other side and straightens out it contracts and releases. When the pulley gets U d out this action is no longer happening. Good luck, Al Eden

[SmilinSam]

Maybe its not related to your problem but heres something to look for when having drive problems on your Sundstrand or vickers hydros. Take a look at the belt clutch mechanism. the bracket that the idler pulley is on rides on a bushing that is bolted to the frame with a long bolt. The bracket should pivot easily on this bushing. In many cases the rust and dirt works its way between the bracket and bushing siezing up the movement. Then when the operator pushes in on the pedal the bracket moves to release belt tension but then does not move back to put tension back on. I have had many tractors with this trouble, and bought many cheap at sales because the other bidders thought the tranny was bad. Some would not move at all, others had enough tension to move the tractor on flat terrain but not up a hill. The symptoms vary as to how much tension is left on the belt. To fix it this problem, just unbolt the assembly , drive out the bushing, clean it all off, grease it up till it rotates smoothly inside the bracket and re-install.

[Tired]

Speaking of worn out pullies I need to order a new on for my starter/ generator. As far as the tranny problem goes I have the same trouble with my sundstrand. To get it to move I start it then Push the bypass valve lever down for a few seconds(30)then lift it back up making sure each of the two plungers pop back up. Then its ready to go. By the way I only need to do that if the tractor has been sitting for a over a week. The fluid must be draining back out of something causing this symtom but havn't figured it out yet. Let me know if you can pin point the problem. Scott

[Al]

Hi, Sounds like the charge pump is getting weak. Good luck, Al Eden