Hello guys. This is my first post, so hear goes Ok got a 1971 cat d7f and it wont steer now, oil level is good, machien will go backward and forward fine but when you pull in the clutches nothing happens itès like the clutches arent disengageing or something. The machien was running fine until it was left to run over night then the next moring this, is it conindience and now when the machien is started after a couple minutes i hear a squeeling/grind noise start up and slowly get worse unitl the machine is shut off, any ideas any help would be great thank you.
Why did it get left running all night long? Sounds like you have a pump problem.
beacuse the dozer is in resolute bay, nunavut, canada and its -35c -50c with the wind chill. but could you explain more, is there a pump that supplys oil to the bearings in the steerind clutch assembly, i thought the hole steering clutch assembly was just submerged in oil thank you for your replie though
Our protocol when troubleshooting dozer power trains is to begin buy inspecting screens and filters, if they are loaded with material, we know something has to be repaired and have to begin trying to determine what and how far we will have to go in order to repair it right. The steering is supplied by oil pressure from the transmission pump which may indeed have failed but why? And if it has, simply replacing it might be a band aid solution that will only last a short time until the whole scenario repeats itself. We would be happy to look at any debris to try and determine what its source is and the extent of damage. Perhaps you could post some pictures? You might find this recent & similar thread interesting:
thank you very much for the replies and yes i will post some pics when i check the screens if i find soemthing of interest. IS there a possibility, it has more to do with the breaks then the clutch, just thinking about this now cuz when your goign forward and pull in the clutches it will stop, so the clutches must be workign properly?, and just the breaks arent working? anythoughts? thank you
I figured that weather was probably the thing. The transmission and steering clutch oil is all intermingeled. (hope I got it spelled close to right) If the pump has failed I don't think that it would move foreword or reverse since the oil to the steering clutches goes through a priority valve which is located just under the top cover on the transmission. Kylemckerral may be on to something there. Since you need both brakes and clutches to steer an F series the brakes may need to be adjusted.ccOnly problem with this line of thinking is that it does not address the squealing grinding noise. When my D7E starts to get weak in the steering I set the brakes up and all is well. I have also noticed that when working a slope with my 7E that if the transmission is not kept 10% overfull that the steering clutches will sometimes get starved and it won't steer. Get it back on the level for a short time and all is well and make sure that 10% overfill is there. Start out and check the screens. There is one on the bottom of the torque converter and another should be on the right side of the tractor just ahead of the deck plate down inside the shroud. Little plate steel cover about 3.0 inches square held in place with 4 3/8" bolts. The pump is under the deck plate about where your left foot would set when operating the machine. Good luck with her.
Agreed on checking linkage and brake adjustment but it doesn’t make sense that mechanical adjustments would change suddenly. Still always wise to check screens and filters as a part of the maintenance routine on any machine and especially when you have an operational problem that could be an indication of a failure which might result in contamination and costly collateral damage to other components that share the same oil system.
Cotter pin could have fallen out that connects the pedals to the brake band housing.