The spindles on your machine must be free from runout and wear. For your cutterhead to produce the optimum fingerjoint, the spindle size should be no more that .0005 less than the nominal size. Runout in your spindle will also prevent your cutterhead from performing properly.

Straight Bore heads are usually equipped with self-centering cones or collets. Always be certain that the collet seat in the head is clean and free from dirt or debris. In addition, the collet must be free from wear, burrs or score marks. Torque the spindle nut according to the machine manufacturer's suggested torque.

Hydro-Lock heads rely on grease pressure and are equipped with a filler and a release valve. The following steps should be observed.

1. Place the head in the desired location on the spindle. Never pressurize a head when it is not on a spindle or when your spindle is .001 inch or more under the nominal diameter. Damage to the head could result.
2. Connect the grease gun to the filler nipple. Always use the WKW recommended grease gun. A regular gun will not pressurize the head to a high enough pressure.
3. Loosen the screw valve on the gauge block, and pump until grease flows out the release valve. This will remove any air pockets inside the head.
4. Tighten the screw in the release valve on the head and pressurize to 300 to 350 bar (4350 to 5075 PSI). Tighten the screw valve on the gauge block and loosen the grease release valve on the gun. Remove the grease gun.
5. If there is no pressure loss within two minutes, install and tighten the lock ring. You may proceed if you have read and understand the information provided by the machine manufacturer. Never operate a Hydro-Lock cutterhead without a lock ring.
6. Always be sure to check for any pressure loss each morning, after each shift change, or after the machine has been idle for more than eight hours.
7. If cleaning the head with a heated solution, always be sure that pressure release fitting is left open to prevent sleeve damage.