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It is a 550 c or also known as just a 550. I dont know if it's the same as the 450. It has low pressure as soon as you start it but it keeps dropping off the longer it runs. The transmission case has been replaced at one point in time no clue how long ago though.

I bought a 83 550. After about an hour of running the dozer will quit pulling under it's own power. When you first start it it pushes great. After it cools back down it pushes great. I checked the pressure on the main port and I'm getting 90 psi in neutral and any where from 60 to 130 in gear. The n...