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The following procedure outlines the steps for changing out an Ace-Loc hydraulic sleeve in a planer head. Please contact AceCo’s technical staff for support. We can help you identify the correct O-ring and backup ring sizing and supply you with replacement sleeves, O-rings, backup rings, cap screws, high pressure grease gun, precision-milled press inserts and an assortment of accessories to help you be successful.

  1.  Release any residual pressure in the cutter head by opening grease release valves.
  2. Remove the cap screws on face of hydraulic sleeve. This process will require the use of an impact driver to loosen screws. If the screws are frozen, use heat (propane torch) to break down the Loctite thread locker.
  3. Press sleeve out of cutter head using an arbor press. Note:Use the correct size insert under the arbor press ram to equalize the pressure to avoid scratching the internal bore of the head with the exiting sleeve. The cutter head can be damaged permanently during this step- best results are achieved through a slow measured process.
  4. Remove old O-rings and backup rings from sleeve and discard.
  5. Completely clean the sleeve and bore of the head with a clean shop rag to remove all residue. Take care to clean away dirt from lip and flange of sleeve near O-ring seats. Inspect O-ring seats for damage. Any nicks or pits will prove the sleeve to be unusable. Inspect the bore of the head for scratches, nicks or pits. Lightly sand any distortions with fine sanding paper to minimize the chance for the new O-ring to be damaged during assembly.
  6. Install new O-rings and backup rings on the sleeve. Be sure to use the correct size, material and hardness of O-rings (Buna Nitrile O-rings of 90 Durometer hardness).
  7. Coat the bore of cutter head, new O-rings and backup rings with clean “high temperature” grease. It is important that no foreign matter is introduced into the rebuilding process. A clean workspace is paramount to success!
  8. Place head securely on arbor press. Insert sleeve into bore and lightly turn back and forth a few times to begin the mating process. Slowly press sleeve into cutter head. If there is any resistance, STOP! Inspect to see if sleeve is being squarely pressed or if O-ring has been pinched or rolled. Take care to secure the sleeve after it passes the upper lip of the bore- lower the sleeve to the bottom of the bore, again turn the sleeve back and forth and resume pressing. Align the flange of the sleeve over the sleeve screw holes.
  9. Clean excess grease out of sleeve screw holes and install new cap screws using a small dab ofremovable (Blue) Loctite thread locker on each screw. Tighten screws in diagonal torqueing sequence. Tighten to 5-6 ft.lb. Do not over tighten screws- tight screws can distort the sleeve.
  10. AceCo recommends replacing relief valves and grease zirks as part of the rebuild process. When replacing standard 1/8” zirks, wrap the threads with Teflon tape- 3 complete wraps. Metric grease zirks come with O-rings and are ready for installation. Be sure to not over tighten either the zirk or valve.
  11. To begin the purging process, back out the allen head set screw in the relief valve 3 turns. Begin filling the head with grease. Allow a generous amount of grease to exit through the valve. Stop and inspect- if grease continues to flow from the valve, an air pocket remains in the void. Repeat the process until there is no longer residual flow coming through the valve. Once you are certain that all air has been purged from the system, tighten the set screw. Wipe away all excess grease left over from the assembly process- from around the fittings, around the sleeve flange, dowel holes, set screw holes and the bottom face of the sleeve.
  12. Inspect and measure the newly replaced sleeve. The bore measurement should not exceed .0005” of factory sizing. AceCo factory bore sizes are 1.8130-1.8135” for the 1-3/16” spindle size and 1.500-1.5005” for the 1-1/2” spindle size. If the measurement puts the bore tighter than the factory sizing, it is possible that the O-ring has moved during installation and is impinging the sleeve.
  13. It is time to pressure test the head. Place head on correct size shop arbor and close release valve. Pressure test head to upper recommended pressure value using a calibrated high-pressure grease gun. You will find the specified pressure value engraved on the sleeve face. The head should grip the spindle and there should be no signs of grease leakage. Check the base of the head, around the flange, around the cap screws and dowel holes, at the grease port and release valve.
  14. AceCo recommends that heads are dynamically balanced to 7,200 rpm on a G1 scale after installing a new sleeve.