A check valve is installed in the control valve for the front bumper winch on certain DC series derricks...
Altec technical service bulletin SIL 799 for 2016-2020 Altec Digger Derrick.
- Bulletin number
- SIL 799
- Component
- Service brakes, air: supply: check valve
- Summary
- A check valve is installed in the control valve for the front bumper winch on certain DC series derricks built from January 2016 through February 2021. Altec has discovered that the check valve has the potential for failure. When the check valve fails, the internal spring can dislodge from the housing and enter the hydraulic system. The hydraulic flow can carry it into the digger/winch control valve and cause one of the spools to bind in the closed position, disabling the function. Altec requires the 035240052 check valve to be replaced no later than the next preventive maintenance interval or 90 days from the receipt of this SIL, whichever comes first.
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