Directional valve at hydraulic pump operates but spindle does not retract.
|
Probable Cause |
Check |
Remedy |
| Tool or spindle binding in external support. | Disengage tool and/or loosen bracket containing support. | Realign and cycle. |
| Low hydraulic supply pressure. | Hydraulic pressure should be between 300 and 500 psi. | Regulate. |
| Plunger valve assembly on retract side of manifold closed. | Turn retract cam bar knob to make lever arm depress plunger of plunger valve assembly. | If plunger does not depress, reset cam follower or lever arm on lever assembly. Ref. Lever Assy. Bul. |
| Retract feed rate adjustment in manifold is closed. | Turn retract feed rate knob counterclockwise to open. | Adjust. |
| Drive shaft and spindle coupling bind. | Remove spindle assembly and check spline tube for metal build-up. | File drive spline and spline tube for free slip movement. Lubricate. |
