munirabbasi Posted November 15, 2018 Share Posted November 15, 2018 Hello Hercules Hydro expertises Can some expertise tell me, have you experience ,failure of steering control valve on C-130 A/B/E/H. Munir Abbasi Home hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted November 17, 2018 Share Posted November 17, 2018 What do you mean be failure? I have changed steering control valves on all of the MDS/models you listed. Normally they are changed for leaking out of limits, changed during shimmy troubleshooting, or changed because of normal wear. I have never seen one explode or anything crazy. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 17, 2018 Author Share Posted November 17, 2018 50 minutes ago, hehe said: What do you mean be failure? I have changed steering control valves on all of the MDS/models you listed. Normally they are changed for leaking out of limits, changed during shimmy troubleshooting, or changed because of normal wear. I have never seen one explode or anything crazy. Thanks Chris hehe Can you submit me any lockheed martin service new/T.O regarding Steering Control Valve. or explain how it work and neutral Munir Abbasi home of hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted November 18, 2018 Share Posted November 18, 2018 The valve is set to a neutral position during overhaul by centering the spool between the outlet ports. What that means is that the valve should not port fluid when in neutral position, this can be a hard position to achieve during overhaul. Neutral position should not port fluid. Neutral uses the internal spring loaded accumulator to take out shocks and movement of the wheels during takeoff and landing. Are you having problems with the valve porting left or right and not holding the wheels in center position? Quote Link to comment Share on other sites More sharing options...
hehe Posted November 18, 2018 Share Posted November 18, 2018 This service news talks about it. If in doubt and you dont know how to rig/overhaul the valve, Just replace it. V12N4.pdf Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 18, 2018 Author Share Posted November 18, 2018 2 hours ago, hehe said: This service news talks about it. If in doubt and you dont know how to rig/overhaul the valve, Just replace it. V12N4.pdf Thanks. Hercules operator countries guys continue promoting/enhancing/contributing skill level of work center mechanic for maintaining safe operation of C-130 hercules big birds Best Regards Munir Abbasi Home of hercules Pakistan Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 21, 2018 Author Share Posted November 21, 2018 On 11/18/2018 at 9:11 AM, hehe said: The valve is set to a neutral position during overhaul by centering the spool between the outlet ports. What that means is that the valve should not port fluid when in neutral position, this can be a hard position to achieve during overhaul. Neutral position should not port fluid. Neutral uses the internal spring loaded accumulator to take out shocks and movement of the wheels during takeoff and landing. Are you having problems with the valve porting left or right and not holding the wheels in center position? Hello hehe Hydraulic Expertise Can you explain what is out put of steering control valve (high pressure ports) for two cylinder actuator? Munir Abbasi Home of hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted November 21, 2018 Share Posted November 21, 2018 11 hours ago, munirabbasi said: Hello hehe Hydraulic Expertise Can you explain what is out put of steering control valve (high pressure ports) for two cylinder actuator? Munir Abbasi Home of hercules Pakistan Are you asking what pressure is ported? There is no pressure reduction in steering control valve, pressure to the actuators depends on how far you turn the steering wheel. Full turn is 3k psi to the extend/retract side of applicable actuators (left/right) Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted December 1, 2018 Author Share Posted December 1, 2018 On 11/21/2018 at 8:31 PM, hehe said: Are you asking what pressure is ported? There is no pressure reduction in steering control valve, pressure to the actuators depends on how far you turn the steering wheel. Full turn is 3k psi to the extend/retract side of applicable actuators (left/right) Thanks Best Regards Munir Abbasi Home of Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
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