Deere service bulletin 181S lists for the D:
Cranking at 105 RPM
Pressure of 62.5 PSI
Hope yours is electric start! Hand start, you aren't going to check it!
You can substitute flywheels no problem as long as it's the same part number. Make sure to line up the marks for proper balance and timing. Some flywheels have a bigger spline to match a screw in the crankshaft that sticks out slightly. Make sure that the pin used to drive the oil slinger (it's on the crank behind the flywheel) is good. Check your flywheel splines and your crank splines to make sure they're all good. Consider new bolts, and don't be afraid to crank on em, I would normally say torque them but that's hard to do on a D!