jwatts
Hot Rolled
- Joined
- Apr 19, 2006
- Location
- Missouri, USA
I have an old Doall D8 surface grinder that seems to have a hydraulic issue. The hydraulic pump starts and runs fine, but when I start to turn up the table speed selector it becomes stiff to turn and the pump sounds like it's under quite a bit of load. The table doesn't actually start to move until the speed selector is turned to maximum. Once the speed selector is maxed out and the table starts moving the pump quiets back down until I turn the speed selector back down at which point the pump loads up again. I pulled the table off to make sure the ways were getting lubricated and while the flow rate seemed low, all the sliding surfaces were getting oil and had no dry spots. Any ideas where the problem might be?