HT22 Plus HD quick-change toolholder systems

Highlights

PERSUASIVE ARGUMENTS

Maximum possible impact load, and in extreme cases also shear load, due to revised toolholder shank geometry and optimised heat treatment.

  • Maximised cost/performance ratio thanks to ideally matched system components. The centring depression pressed into the upper part of the HT22 PLUS HD stabilises the GENERATION Z² round-shank pick in its optimum position and thus promotes rotary motion.
  • Reduced shear stress thanks to ideal application of force in the upper part of the HT22 PLUS HD in conjunction with GENERATION Z² round-shank picks due to better centring and support.
  • Better bottom part protection due to larger wear volume in the shoulder area of the top part of the toolholder ensures longer service life of the individual bottom parts and the entire milling drum.

Larger wear volume in the shoulder section
Optimised shank geometry
High volume of steel in the front part of the toolholder
Long service life of the top part
Recommended uses

Milling and mixing rotors

Maintenance and replacement of toolholders
STEP 1

First clean the borehole for the retaining screw to remove all asphalt residues. Then lever out the protective plug with the blade of a screwdriver. The protective plugs offered by WIRTGEN considerably reduce the cleaning effort and enable faster replacement.

STEP 2

Thoroughly clean the head of the retaining screw, release it by hand with a hexagon key, screw it all the way out and remove it. The considerable stresses in the cutting process can cause deformation of the threads and the screw head. To prevent damage to the threads of the bottom part of the toolholder, the screw should not be reused.

STEP 3

After removal of the retaining screw, the toolholder can now be pulled out of the bottom part.

STEP 4

Now, the threaded bore and the cylindrical guide of the toolholder bottom part welded onto the milling drum must be carefully cleaned and checked for damage. Cleaning makes sure that no milled material is present in the bottom part and ensure that the contact surfaces between the top and bottom parts make a positive connection without a gap after assembly. The surface of the bottom part of the toolholder must be even and undamaged.

STEP 5

After ensuring a faultless contact surface, slide the bottom part seal over the shank of the replacement toolholder.

STEP 6

Now apply a high temperature grease (up to 100°C / 212°F) to the toolholder shank and insert it into the bottom part of the toolholder.

STEP 7

Apply the same high temperature grease to the retaining screw and screw it in by around three turns by hand. Should screwing in the new retaining screw require considerable effort, the thread of the bottom part must be re-cut with a tap.

STEP 8

The retaining screw can now be screwed in and subsequently tightened to a tightening torque of 500 Nm (equivalent to 370 ft lbs) using a torque wrench.

STEP 9

After tightening the retaining screw, conduct a sounding test. Check whether it settles deeper by hitting the contact surface with a hammer. Use a copper hammer for this.

STEP 10

After this, check if the tightening torque of the retaining screw is still 500 Nm (370 ft lbs).

STEP 11

If it is, insert the plug into the head of the retaining screw.

STEP 12

The final step is the installation of the new round-shank pick. Use the copper hammer again for this.

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