I have an older case 850 dozer and it has been working fine until last week. i have no lift on blade or angle but it has a quick coupler hookup on the back of dozer.the hoses are connected and when i disconnect them the blade will work but the pump loads the engine and it won't rev up. if i put the rear hoses back together the motor revs up fine but the blade will not raise.I removed the main relive valve and it looks fine.I would appreciate any help trouble shooting the problem
straight 850 case dozer hydraulic problem
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