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SECTION 5:
MAINTENANCE AND INSPECTION
5.1 Daily Inspection
1.
Wipe the exterior of the machine with a clean cloth.
2.
Lubricate the shaft of the idle wheel with machine oil.
3.
Clean the outer surface of the drive wheel with an oily cloth.
5.2 Monthly Inspection
1.
Lubricate the cross-feed handle shaft and the clutch lever.
2.
Measure the insulation resistance between the machine body and the power plug by tilting the switch toward either
“Forward” or “Reverse. It must read over 5K
Ω
.
3.
Remove the operation panel and clean the electrical parts inside.
5.3 3-Month (2000-hour) Inspection
1.
Remove the motor and speed change cone and replace the old grease inside the gear box with new grease.
2.
Completely remove oil, if any, from the motor disc and speed change cone with thinners, etc.
SECTION 6:
TROUBLE-SHOOTING
Backfire and Flashback
The most basic problems involve backfire and flashback. While the two terms are often confused, strictly speaking
backfire is when the flame ignites momentarily inside the torch and then goes out, or goes out and re-lights (punching
backfire), whereas flashback refers to the flame burning continuously inside the torch (sustained flashback).
1.
Backfire
–
causes
a)
Incorrectly adjusted gas pressures.
b)
Overheated nozzle.
c)
Slag sticking to nozzle.
d)
Tapered seat of nozzle or torch are damaged.
Should backfire occur, find the cause and take appropriate action before using the machine again.
2.
Sustained Flashback
If the flame disappears back into the torch and burns there (making a soft, hissing sound), shut the valves off in the
following order immediately.
Preheat Oxygen
Fuel Gas
Cutting Oxygen
As with backfire, find the cause and take appropriate action before using the machine again.
1. Carriage does not move. (Motor does not run).
Possible cause
Procedure
Remedy
1 No electrical power
Check power source and connections.
2 Broken power cord
Use a circuit tester to check the cord. If the
tester shows
∞
, the power cord is broken.
Repair or replace the broken cord.
3 Faulty plug
Check the wire soldering.
Resolder the wire.
4 Faulty switch
Remove the mode terminal and test the
switch.
Replace faulty switch.
5 Faulty condenser
Check the condenser with a tester. If the
tester handle slightly vibrates and shows
∞
immediately, the condenser is normal.
Replace faulty condenser.
6 Faulty connection
Check soldering.
Resolder faulty connection.
7 Broken lead wire
Test each lead wire.
