International 250A

First let me say thank you, I have an international 250a backhoe that sets a lot. Started it up after sitting most of the summer and when I put a load in the bucket the front wheels are very difficult to turn almost impossible, when I unload the bucket and lift it up off the ground the front wheels turn somewhat easier but not as easy as they used to. The last time I used this hoe which was in the fall I had no problems. The hydraulic Reservoir is full because I checked it. Just moving the hoe up and down in a straight line the steering problem is not an issue as I used it to plow snow in the winter time. Any suggestions on solving this problem as I use it primarily for loading firewood and without the steering it"s difficult to maneuver in the woods. I do not hear any noises coming from anywhere as I turn the wheels however when the wheel is turn hard to the right or extremely hard to the left of the steering wheel will pulsate when it is turned as far to the right or left as it will go no pulsating when it"s going straight however there does seem to be a lot of play in the steering wheel. When it is sitting flat on the ground with a load in the bucket it seems like the steering wheel turns but the wheels do not but they will eventually turn if you force them extremely hard right or left any ideas guys