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sectioN 5
5.1 General
If this equipment does not operate properly, stop work
immediately and investigate the cause of the malfunc-
tion. maintenance work must be performed by an
experienced person, and electrical work by a trained
electrician. Do not permit untrained persons to inspect,
clean, or repair this equipment. use only recommended
replacement parts.
Be sure that the wall disconnect switch or wall circuit
breaker is open before attempting any inspection or
work inside of the prest-o-lite
5.2 InspecTIon anD cleanInG
Frequent inspection and cleaning of the Prest-O-Lite
recommended for safety and proper operation. Some sug-
gestions for inspecting and cleaning are as follows:
A.
Check work cable to workpiece connection.
B.
Check safety earth ground at workpiece and at power
source chassis.
C.
Check heat shield on torch. It should be replaced if
damaged.
D.
Check the torch electrode and cutting nozzle for wear on
a daily basis. Remove spatter or replace if necessary.
E.
Make sure cable and hoses are not damaged or
kinked.
F.
Make sure all fittings and ground connections are
tight.
Water or oil occasionally accumulates in compressed air
lines. Be sure to direct the first blast of air away from the
equipment to avoid damage to the prest-o-lite
550.
®
550 is
®
550.
®
G.
With all input power disconnected, and wearing
proper eye and face protection, blow out the inside
of the Prest-O-Lite
compressed air.
5.3 floW sWITcH (fIGure 5-1)
When excessive contamination is found in the air, the
flow switch (FS) should be removed, disassembled and
cleaned as follows:
A.
Ensure the system is shut down and there is no
trapped air under pressure in the piping.
B.
Remove the piston plug.
C.
Remove the spring (FS-4 only). Use care when han-
dling spring to prevent distortion.
D.
Remove the piston.
E.
Clean all parts with cleaning agent.
ensure cleaning agent does not contain solvents
which can degrade polysulfone. Warm water and
detergent is recommended for cleaning. allow all
parts to dry thoroughly before reassembly.
Reassemble the flow switch in reverse order.
SPRING
FLOW SWITCH
figure 5-1. Disassembly / assembly of flow switch
29
maiNteNaNce
550 using low-pressure dry
®
noTe
PISTON PLUG
PISTON
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