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951-170-218-EN
Version 06
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12. Malfunctions, causes, and remedies
12.3
Error with the use of MQL systems with bypass control
Malfunctions, causes, and remedies, Table 16
Malfunction
Cause
Remedy
Insufficient amount of
aerosol at tool
o Inlet air pressure is fluctuating
• Check inlet pressure and correct if necessary
o Inlet air pressure too low
• Check inlet air pressure and correct if necessary (max.
10 bar)
o Bypass restrictor on bypass valve contaminated
• Blow out the bypass restrictor; to do so, close the ball valve
upstream of the spindle and execute lubrication program
No. 3
o Opening on bypass restrictor unsuitable
• Test bypass restrictor with different opening or record op-
erating parameters and contact SKF Service
o Leakage in bypass system (Y-distributor on bypass re-
strictor of ball valve)
• Identify and resolve leak
Bypass valve does not
cycle during machining
process
o Incorrect program number configured
• Use program number 50
o Unsuitable ratio between cooling duct diameter and by-
pass restrictor diameter
• Record operating parameters and contact SKF Service
