OPERATION & MAINTENANCE
4.10
24.Check for proper limit switch operation at this point by manually extending and
retracting the hydraulic cylinder.
25.Install the die. Follow the torque procedures outlined in section 4.
26.Install the head cover.
Piston seal replacement procedure.
Leaky seals can sometimes cause a hazardous situation and can allow air to be drawn
into a recovery system. The procedure for replacing the cold end cylinder seals is
outlined below:
Note: If this procedure is done with care, the extrusion die does not have to be re
moved.
1. Allow the machine to thaw out completely before beginning this procedure.
2. Extend the hydraulic cylinder fully.
3. Disconnect all electrical power and follow your company's lock out and tag out
safety procedures.
4. Remove the webb plate cover and set it aside.
5. Remove the seal retainer and retainer ring.
6. Reconnect power and retract the cylinder. The piston should pull the seal out of
the cold end head. Do not retract the cylinder more than about 1/3 of the stroke.
7. Disconnect all electrical power and follow your company's lock out and tag out
safety procedures.
8. Remove the rod coupling.
9. Reconnect power to the machine and retract the cylinder.
10.Disconnect all electrical power and follow your company's lock out and tag out
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