Mold-Masters Hot Runner, User Manual, Page: 115 / 319

10.6.5 8600 - AR Series
1. Insert anti rotation dowel into the actuation plate.
2. Insert the piston collar by aligning it with the anti rotation dowel.
3. Lightly use silicone grease and install the O-ring in piston collar in the
cylinder bore pocket.
4. Install the cylinder (where applicable) and align the flat on the stem of the
piston bottom with the flat in the piston collar (without the pin and piston
top) into the hydraulic plate.
5. Measure the distance AC and BC.
6. Calculate the heat expansion factor.
Fh = (Processing temperature - Mold temperature) °C x 0.000012.
7. Calculate the heat expansion of the valve pin.
HE = distance BC x heat expansion factor = BC x Fh.
8. Cut pin to calculated length “L”.
• HY8600 AR: L = AC - 59.70 (2.35) - HE + 0.5 (0.02) + CD [mm (in.)]
9. Grind the valve pin tip to an angle of 20° per side (40° inclusive).
10. Lap the tip of the pin into the land area (steel section in the gate area)
using a lapping guide bushing or valve bushing as a lapping guide. We
recommend 400 - 600 grit lapping paste.
11. Assemble the hydraulic unit.
10-9 HYDRAULIC / PNEUMATIC ACTUATORS
Hot Runner User Manual
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