Reverse stall check- I can't remember for sure because it has been a long time but reverse may be a tad higher geared than forward. Forward for work and reverse more for speed. As long as the drive line stalls when tracks are stalled when in gear you should be good. Great news on the pressures. I think your transmission and converter are good to go.
Heating- Many of those machines came with a reversible fan so you could send the heat out the front in summer and bring it in in winter.
Barring other issues it should cool in either direction. The reversible fans
have springs at each blade near the hub so you could push the blade toward the center and rotate it to change the direction of air flow. If they have not been rotated for a period of time you are going to struggle to get them to move. Sometimes you have to remove the fan, lube it up and beat on it to get them loosened up.
If it does not have the reversible type you can not just turn a standard fan around. Efficiency will be poor if on backward.
In front of the radiator is the transmission cooler they have a tendency to plug up between the two. Some machines coolers were on a hinge to swing open for cleaning. I can't remember if 175B was that way.
Give your radiator and cooler a good cleaning chances are you will be fine.
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