Troubleshooting - Harris 4400160 Manual Del Usuario

Cutting Attachment. Always open oxygen valve wide on torch handle.
Follow lighting procedure in welding torch instructions, using fuel gas
valve or torch handle and preheat oxygen valve on cutting attachment to
adjust preheat flames.
Cutting Torch. Use the same procedure as in welding torch instructions.
After setting flame, depress cutting oxygen lever and open preheat
oxygen valve slightly to re-set flame.
4. Move flame to edge of steel and position preheat cones just above the
metal.
5. When steel becomes red, slowly depress cutting oxygen lever to
release oxygen stream to cut through steel.
6. Slowly move torch in direction of the cut.
Note:
1. The correct cutting speed is accompanied by a sputtering sound, and
a steady stream of sparks. This results in a clean, slag free cut with
square top and bottom edges (A, Fig. 20).
2. Too fast a movement does not allow enough time for the oxygen
stream to cut all the way through the metal. slag fills the kerf and the
two pieces are not severed (B, Fig. 20).
3. Too slow a movement leaves a rounded top edge with slag sticking
to the bottom of the metal (C, Fig. 20).
4. The size of the preheat flame (D, Fig. 20) determines how quickly
the cut can be started. Often, a small preheat flame is desirable to
conserve gases and prevent melting of the top edges.
A. Perfect cut shows regular surface with
slightly sloping drag lines. Surface can be
used for many purposes without machining.
B. Extremely fast not enough time is allowed
for slag to blow out of the kerf. Cut face is
often slightly concave.
C. Extremely slow produces pressure marks
which indicate too much oxygen for cutting
conditions.
D. Preheat too hot rounded top edge caused by
too much preheat. Excess preheat does not
increase cutting speed. It only waste gas.
Maintenance Instructions: Check Valves
Leak test Check Valves at least every six months, as follows:
1. Shut off fuel gas supply and disconnect hose from check valve.
2. Set oxygen regulator to 5 PSI, open all gas valves on torch or cutting
attachment.
3. Plug tip and check for reverse flow to fuel gas check valve. Use soapy
water or immerse in water to check for leaks. Set pressure to zero
after test.
4. Reconnect fuel gas hose and disconnect oxygen hose.
5. Repeat Steps 2 and 3 using fuel gas regulator as pressure source.
6. Reconnect hoses and purge system before use.
7. This procedure must be done in a well ventilated area.
Regulator Test
A leak test of the regulators may be made as follows: (Also see your
"Regulator Instruction Manual".)
1. Close fuel gas cylinder valve.
2. Shut off fuel gas regulator by turning adjusting key counter-clockwise
until loose.
3. Close fuel gas torch valve.
Note: Watch cylinder pressure gauge for several minutes. A pressure
drop indicates a leak in the inlet side. Tighten connection and recheck.
Also watch the delivery pressure gauge. A rise in pressure indicates a
leak in the regulator valve. If leak cannot be stopped - DO NOT USE THE
REGULATOR. All gauges should read zero when the pressure is removed.
If they do not, the gauges may be damaged. If damaged, check system
for cause of damaged gauges. Have the damage repaired by a qualified
repairmen, replacing the damaged gauges. Repeat procedure shown
above for the oxygen regulator.
Cleaning Gauges
The gauge crystals are made of polycarbonate. Use only soapy water to
clean, then wipe dry using soft cloths. Do not use solvents.
Changing Cylinders
A cylinder is depleted and is considered empty when it is unable to
deliver fuel gas or oxygen to torch tip at the set pressure.
1. Close supply valve of depleted cylinder and bleed off all gas in
depleted line at torch. Close torch valve.
2. Disconnect hose and regulator from depleted cylinder.
3. Screw Valve Protection Cap onto cylinder, mark "Empty," and remove.
4. Follow procedure under Set-Up Instructions with the new cylinder.
5. Purge system.
Purging System
Warning: Purge only in a well ventilated area. Do not direct flow of any
gas towards any person or any flammable materials. Do not purge near
open flames or any source of ignition.
1. Slowly open oxygen supply valve, then open fully and adjust regulator
to proper pressure with torch valve closed.
2. Open torch valve and allow gas to flow about one second for each ten
feet of hose. Close torch valve after purging.
3. Slowly open fuel gas supply valve not more than one full turn, then
adjust regulator to proper pressure with torch valves closed.
4. Open torch valve and allow gas to flow about one second for each ten
feet of hose. Close torch valve after purging.
Torches and Cutting Attachments
1. Periodically check for leaks, using soapy water or by immersing in
water and checking for bubbles.
2. Tighten connections and packing nuts to stop leaks. Do not use
excessive force.
Storage: When not in use, store the equipment in a clean and safe place.

Troubleshooting

TROUBLE PROBABLE CAUSE
• Tip is operated at too
Welding tip popping
• Too close to work
Flames not clearly defined,
smooth or even
Regulator not holding
constant pressure
Cutting tip popping Too loose Nicked seat
Leak around needle valve Packing nut loose
Difficult to light Too much Pressure
• Oxygen needle valve on
torch handle partly closed
Flame change when
cutting
•Oxygen cylinder almost
REMEDY
• Increase pressures, and
consult
low heat valve
appropriate tip chart
• Tip too large
• Use smaller size tip
•Raise tip from work
Clean with tip cleaner or
Dirty tip
replace tip
Return unit for
Defective seat
replacement
Tighten tip nut
Tighten packing nut
Consult appropriate tip
chart
• Open oxygen valve wide
• Replace cylinder with
full one
empty
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