TD 15c high transmission temp

tkwfarms · Mar 15, 2016

We have a 74 TD 15c that we have been having trouble with the transmission temp getting hot after pushing dirt for 3 hrs or so. It will cool down if left to idle but then heats right back up. We have just replaced the seal and o-rings and turbine on the torque converter probably 20 hrs ago. It has new oil and new filter and suction filter is clean. We have removed the trans oil cooler and cleaned it out.

Today we checked pressures on the block by the steering levers and the lube pressure was really low like 4 psi. would that indicate that the charge pump is bad?

We have messed with this on and off for over a week and you don't get very much dirt pushed by only being able to work for 3 hrs or less. Any help would be appreciated! Thanks!

jm. · Mar 15, 2016

Low lube pressure COULD mean weak charging pump and it IS worth a try because here is what happens the way OIL gets to the oil cooler is what we call waste oil, only after all the other requirements are met then the left over pressure goes thru the oil cooler so you may have low flow there, but MORE than likely you have excessive bleeding in the transmission causing the low pressure and the pump just can,t keep enough flow to get some thru the oil cooler. What are you running for transmission for oil?

tkwfarms · Mar 15, 2016

We are running 15 40 rotella. Everything works good on the dozer even when it gets hot it still all works. We removed the torque converter this winter because we had a leaking rear crankshaft seal. That is when we found that the turbine wheel was cracked and replaced it. Everything else inside the converter looked good.

jm. · Mar 15, 2016

Never have had anybody try 15W 40 most folks around here always use cheap 30 wt oil. I would not think the oil getting thicker when it get hot like 40 wt would make it run hot. I still lean toward internal leakage in the transmission causing you to just not get enough flow thru the oil cooler. You might take the hose off and put it in a five gallon bucket after it gets hot then start the tractor see if it fills in less than a minute. I am betting you flow will be far from that or better yet stick a flow meter on it and check it. Or go to harbor freight buy a uv temp checker and read the temp of the inlet and outlet of the oil cooler . You can determine if you have flow that way.

tkwfarms · Mar 15, 2016

We were told to run what we run in the engine and we got used to doing it when the rear crankshaft seal was leaking. When we cleaned the oil cooler out it acted like it was plugged with sludgy oil and we cleaned it out with a hotsy. We were having trouble getting hardly any oil out of the hose before. After installing it we used a infrared thermometer and checked it and its 20 degrees cooler on top than bottom. When the torque converter was 270 with the handheld the cooler was 244 on bottom and 225 on top. The transmission case itself wasn't near as hot. We talked to a mechanic that was has worked on these dozers quite a bit said he thought it was a broken spring in one of the lube pressure valves. We will try the bucket thing tomorrow.

jm. · Mar 15, 2016

The valve can be accessed without removing it. Be very careful and do not reverse the spool ,that is very common mistake folks make. If the spring is not broke might shim it with a dime but I still lean toward transmission leakage, that is just the most common thing, however your reported temperatures are right in the range, need at least a 30 degree drop from top to bottom but 180 to 200 range is about normal. Have 28 years experience working on the ih dozers. E mail is open if you need more help.

TD 15c high transmission temp

tkwfarms

New User

jm.

Well-known Member

tkwfarms

New User

jm.

Well-known Member

tkwfarms

New User

jm.

Well-known Member

Similar threads