We can help you determine the right oil for your Cat machines or you can refer to. It is a gear pump and if you end up replacing it make sure you clean the magnetic filter, replace the trans filter and prime the pump before staring up the engine or you could have a pump failure due to lack of lubrication. Cat TDTO (TMS) can reduce the number of Cat oils required from four to two. If your pressure is down I would suspect the trans pump is worn out. The speed clutch should be 300 to 350 psi and the directional clutch should be 50 to 60 psi less than the speed clutch pressure. Check with transmission in gear and at hi idle. The one closet to the angled corner is your speed clutch tap and the other is your directional pressure port. If you have the floor boards off and take the small cover off the top of the transmision there are two pressure ports on the pressure control valve. The plug on the pump is a 1/8 inch pipe thread. I would put a pressure guage on the trans pump and see what you have. This is the reason you can not get the shift lever into gear. That is when the oil is cool you have pressure but as soon as it warms up you lose it. Richard it sounds to me that you have a pressure problem.
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