I have an IH 300 Utility (1955). After sitting in a shed for 15 years. I have brought it back to life which basically involved cleaning the points and replacing some old wiring. I have also rebuilt the hydraulics in order for them to stop leaking with new rings and gaskets. I drained and replaced all fluids on the tractor, the trans fluid was milky but there were only a few small filings found in the rearmost drain plug. I don't think we ever changed out the transmission oil in the past. My next challenge is the following:
The tractor works great, except I cannot put it in the road gears 4 and 5. All other gears (R, 1, 2, 3) work fine, including with the torque amplifier. Independent PTO also works if this is relevant. These gears used to work 15 years ago, although they weren't used too much. There was no catastrophic incident where those gears suddenly stopped working. I don't hear anything grinding inside the transmission. The shifter will move all the way to the right but it will not engage up/down into the gears (I am fully stopped and wait for the gears to stop spinning before trying 4 and 5, clutch pedal all the way down). I had hoped the new trans oil would work into those gears after a bit and they might start working, but this hasn't happened and I've been running it every day for two weeks. Rather than force it and bust the forks, I want to ask how I should proceed. I plan to take the shifter off the transmission body and try to free up the leftmost rail (shifter to the right means rail & fork to the left) which I think must be rusted stuck. I guess I would just try to free it up with penetrating oil and a large screw driver. Do you think this is what's wrong? Am I going to have to take apart the hydraulic reservoir again and go deeper into the transmission? Will I need to drain the transmission again? I have the I and T shop service manual for models 300 through W 450 D which does describe the transmission in general but doesn't show how the forks interact with the gears in the transmission.
I have a diagram but I am a new poster and I guess I cannot upload that yet (I will soon). Any advice would be greatly appreciated!
The tractor works great, except I cannot put it in the road gears 4 and 5. All other gears (R, 1, 2, 3) work fine, including with the torque amplifier. Independent PTO also works if this is relevant. These gears used to work 15 years ago, although they weren't used too much. There was no catastrophic incident where those gears suddenly stopped working. I don't hear anything grinding inside the transmission. The shifter will move all the way to the right but it will not engage up/down into the gears (I am fully stopped and wait for the gears to stop spinning before trying 4 and 5, clutch pedal all the way down). I had hoped the new trans oil would work into those gears after a bit and they might start working, but this hasn't happened and I've been running it every day for two weeks. Rather than force it and bust the forks, I want to ask how I should proceed. I plan to take the shifter off the transmission body and try to free up the leftmost rail (shifter to the right means rail & fork to the left) which I think must be rusted stuck. I guess I would just try to free it up with penetrating oil and a large screw driver. Do you think this is what's wrong? Am I going to have to take apart the hydraulic reservoir again and go deeper into the transmission? Will I need to drain the transmission again? I have the I and T shop service manual for models 300 through W 450 D which does describe the transmission in general but doesn't show how the forks interact with the gears in the transmission.
I have a diagram but I am a new poster and I guess I cannot upload that yet (I will soon). Any advice would be greatly appreciated!