Looking for some advive/help 125c International loader

hey guys, im new to this group and new to the world of working with crawlers. I have a international 125c track loader and its having some issues. bought it last summer and it done great. Last time I used being around march until yesterday I had no issues. Get on it yesterday and im having some pulling issues. would not move at all at first so I let it warm up for around 30 mins after that it would take off and pull fine. I moved some rock around for around a hour and started noticing it was slowing down and taking time to kick into gear. so I figured I should make the way to the shop. heading that way in 2nd gear it slowed down to almost nothing and 1st was even slower. put it in rewind and it moved fine 1st 2nd and 3rd. shut it off for a few mins started back up and forward gears worked great for around 50ft then back to almost not moving at all. And I also noticed while goin forward if i would stop and put it in neutral then back into forward it would help for few minutes. The pressure gauge moves from about halfway to nothing when engaged into gear, the converter temp wasn't showing it being hot, it was in the normal range. fluid level in the reservoir on the left of the seat is well above the sight glass and the dipstick under the seat was showing just a small amount under the full mark not close to the add mark. I haven't changed any filters, is the canister filter in the battery box the one I should go to first? any help or input would be greatly appreciated. thanks

Looking for some advive/help 125c International loader