The two hold-down assemblies and the green belt in the picture below keep the top layer of membrane flat on the bottom layer as it is heated by the nozzle, just before the drive tire presses down on it.
Each hold-down assembly contains the following parts:
Periodically check on each assembly that the U-profile (202) is tight to the guide pillar (201). Sometimes the screw (205) works itself loose. If this is not corrected, the screw may loosen entirely, and it and the U-profile (202), roll pin (204), roller (203) and spring (85) will fall off.
Fixing a Loose Hold-Down Assembly
Replacing a Lost Hold-Down Assembly
Assembling a Hold-Down Assembly from Parts
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