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3.14 Duty cycle ratio
NOTICE
Operating the DTH beyond the recommended duty cycle ratio can cause excessive heat
generation and damages to the DTH like bearing failures. DTH body temperature should not
exceed 65°C (149°F) when operating under normal conditions.
3.15 Service interval
DTH life time depends on cutting application and operation conditions.
Wear items such as bearings and seals need to be replaced periodically.
Recommended service interval is
• 12 months under normal conditions in 2 shifts.
• 6 months when operating under 3 shifts or heavy conditions or high RPM.
• 6 months for DTH with internal coolant supply.
Maintenance includes cleaning the inside of the DTH and lubricating the bearings and gears.
Maintenance work must be performed by WTO factory owned service centers or by staff who
are trained by WTO.
Recommended duty cycle ratio
(operating under normal conditions)
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