I have a case cx135sr that started having a tapping/knocking noise coming from the main hydraulic pump. When I went to change the filters I noticed a lot of brass in the oil and in the filters. Assuming it was from the pump, I ordered a "certified" used pump that had been pre-tested. It was a "plug and play" kind of pump. Got the new pump on and everything hooked up and tank filled. Turned to motor over a few times to get the air out and fluid moving. Started it up and everything works but the left track, the bucket curl in and no down pressure. It also doesn't seem to have much pressure any where (slow movements). Did I get a bad pump or is there something else going on?
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