transmission or torque converter td15

my fathers td15 starts great, takes 15 minutes to warm up before it starts to move, works great for 30 minutes then start to lose power to the lags, goes away in 2 to 3 minutes, has to be shut down for several hours before you go thru the process again.This dozer ran great for years, then this started to happen.Is there an old hydrolic hose internally collapsing on heating up or is there a known issue with these dozers. Thanks for any help.
 
Sounds like Torque Overheating. Most often caused by lack of oil flow. Start with checking screens and filters. Once they are taken care of check pump pressure at high and low idle. Pressure should hold 90% of high idle reading at low idle. Then check pressure in all speeds and both directions at low idle and compare. Come back with what you find.
Later Bob
 

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