Hypertherm HD4070 Rev.1 - Manual (Page 213)

5-50 HyPerformance HD4070 Instruction Manual
MAINTENANCE
Cooling system
5. Inspect the coolant-circulating system’s filter element at the rear of the power supply. If the filter is a brownish
color, replace it. Consult the Parts List in this manual for part numbers.
6. Perform a coolant flow test as described in this manual, then check for coolant leaks. Primary locations to
inspect are these:
A. The back of the power supply;
B. At the ignition console, and;
C. At the torch main body.
Also, check the coolant tank for dirt and particulates. Verify that proper Hypertherm coolant is being used. Proper
Hypertherm coolant (028872) is a red liquid.
Torch main body
7. Verify that the water tube is straight and has no pitting on the end.
8. Inspect the current ring inside the torch main body. The current ring should be smooth and not pitted. If no
pitting is observed, clean the current ring with a clean cotton swab and hydrogen peroxide. Do not use alcohol.
Pitting on the current ring generally indicates improper maintenance (i.e. lack of regular cleaning).
9. Clean all threads on the front end of the torch head with hydrogen peroxide and a cotton swab, pipe cleaner or
clean cloth. Do not use alcohol. Damage to the threads usually results from not cleaning the torch and
retaining cap threads properly, so that dirt and particulates accumulate in the threads.
10. Inspect the torch insulator for cracks. Replace the torch if you find cracks.
11. Inspect all o-rings on the torch body and consumables. Make sure that the correct amount of lubricant – a thin
film – is applied to these o-rings. Too much lubricant may obstruct gas flows.
12. Check that the retaining or shield cap is tightened securely to the torch main body.
13. Inspect all hose fittings at the rear of the torch for wear. Damage to the fitting threads may indicate that
overtightening has occurred.
14. Check that all connections between the torch and torch leads are tight, but do not overtighten. See torque
specs in the Installation section of this manual.
When removing consumables, always place them on a clean, dry, oil-free surface, since dirty consumables may
cause the torch to malfunction.
Gas flows
15. Check each gas line from the gas supply, as follows:
A. Remove and plug the inlet gas fitting at the gas console.
B. Pressurize the gas line to 8 bar (115 psi).
C. Close the gas supply valve at the source. Watch for a pressure drop. If the gas supply line is a hose, there
may be a 0.3 to 0.5 bar (5 to 7 psi) drop due to hose-stretch.
D. Repeat for each line from a gas supply source. If any pressure continues to drop, find the leak within the
system.