Purging Fuel From The System And Adjusting Fuel Pressure - Hobart 770 500 Owner's Manual

7-2. Purging Fuel From The System And Adjusting Fuel Pressure

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Inspect all equipment before
!
use. Do not use damaged,
defective, or improperly ad-
justed welding and cutting
equipment. Make sure levers
and valves work properly,
threads on equipment are
clean (no grease or oil) and
not deformed, gauges are in-
tact and easy to read, regu-
lator is clean and free of oil or
dirt, and fittings are properly
sized for the cylinder. Make
sure hoses are clean (no
grease or oil). Be sure all
connections are tight and
there are no leaks in the sys-
tem.
Always purge gas from the
!
system before lighting torch
to prevent a possible
mixed-gas explosion. Purge
gas in a well ventilated area
and away from flame or
sparks.
.
See Sections 5-3 and 5-4 for
oxygen and fuel pressure re-
commendations.
.
Purge oxygen from the system
according to Section 7-1.
Purging Fuel Gas And Setting
Fuel Pressure
1 Fuel Cylinder Valve
2 Torch Handle Fuel Valve
3 Preheat Oxygen Valve
4 Fuel Regulator Adjustment
Handle
Using the supplied key wrench,
slowly open the fuel cylinder valve
one turn maximum (for acetylene).
Fully open fuel cylinder valve for all
other fuel gases.
Open fuel valve on torch 1/4 turn for
five to ten seconds. (If using weld-
ing attachment, also open preheat
oxygen valve.) While the fuel is
flowing, turn the adjustment handle
on the fuel regulator to achieve the
desired working pressure.
Close the fuel valve and the preheat
oxygen valve on the torch handle.
Tools Needed:
161-032 / 043