skipjackbill
Plastic
- Joined
- Mar 20, 2019
shift to the higher speeds
Last edited:
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I'd want to verify that the hydraulic system is at the correct pressures first. If you have a gage with the correct range and the right fittings, the test is actually simple and easy to do.
Using the heavier DTE Medium probably isn't causing your problem, but longer term, especially if your shop gets cold, I'd want the thinner DTE Light.
When the spindle is turning in any of the functioning speeds, do you see oil flow through the oil sight gage in the headstock?
When you had the headstock cover off and changed speeds, where did the burst of oil come from?
The difficulty in turning the shift knob in the two speed positions sounds like there's pressure in the hydraulic system, as if the shifts aren't completing.
It's not unheard of for these Hydrashifts to develop sludge or varnish in the piston bores of the hydraulic shift block, especially if the maintenance has been neglected or the machine sits unused for long periods of time. When I disassembled the shift block on my 12-1/2 Hydrashift, I found sludge in the ends of the bores, on the removable head plates. If there's enough stuff in there, it might be restricting the full travel of the piston.
Remove the headstock cover, and with the motor off, try shifting each of the three fork/piston assemblies through their full range of motion. You may have to jog some of the gears by hand to get them to engage as you move the shift fork/piston. Note that the "B" shaft has two grooves for a ball detent, so it may be harder to move out of those two positions.
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