Maintenance
Clean Heater Surfaces
The heater faces must be kept clean and free of any plastic build up or
contamination.
Before each fusion joint the heater surfaces must be wiped with a clean,
non-synthetic cloth.
NOTICE: Do not use an abrasive pad or steel wool. Use a non-synthetic
cloth that won't damage surfaces.
TX00440-8-14-08
PH03875-3-29-10
7 - 4
Bleeding Air From Hydraulic System
The two carriage cylinders have air bleed screws and must be bled
if the system ever runs low on oil or leaks air on inlet side of pump.
Air in the system is indicated when carriage movement becomes
jerky and erratic. To bleed the system, proceed as follows:
For the 28 and 250 machines:
Remove upper jaws & clamping eye bolts from the two movable
clamp jaws to expose the bleed plugs recessed in top of the lower
jaws.
For the 412 machines:
The bleed screws are on the ends of the rod glands.
Tilt machine so the fixed jaw end is higher than the opposite end.
Move the carriage control valve to close carriage, and move the
carriage to the fixed jaw end.
Loosen the bleed plug on one cylinder next to the fixed jaw.
Hold pressure on the cylinder until no air is indicated and quickly
tighten the plug.
Repeat this operation on the opposite cylinder.
Tilt the machine so the opposite end is higher than the fixed jaw
end. Move the carriage to the end opposite the fixed jaw and
repeat the above procedure on the this end of the cylinders.
TX02975-04-08-14
PH03949-3-29-10
PH04126-4-7-10
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