HES Posted February 11, 2015 Share Posted February 11, 2015 So i'm new to the heavy truck scene and have recently purchased a 2000 RD688s. E7 460 with 13 speed maxi. So among all the little issues i've been addressing, i've been messing around with the air tailgate and found out it only opens. Does not close unless I engage the air valve close and actually remove the rear most air line from the actuator. So my questions is what are the troubleshooting guidelines for this particular issue? Thanks in advance fellas!! Quote Link to comment Share on other sites More sharing options...
hatcity Posted February 11, 2015 Share Posted February 11, 2015 actuator is messed up. Does it leak air?I have sprayed PB Blaster and worked it back and forth to get clear.OR, the diaphragms are boogered and need replaced.Oh, WELCOME!! Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
HES Posted February 11, 2015 Author Share Posted February 11, 2015 When it's in the open position it does not leak air. When in the closed position it leaks from the shaft seal. And yes I sprayed some PB along the shaft and worked it back and forth to no avail. Quote Link to comment Share on other sites More sharing options...
hatcity Posted February 11, 2015 Share Posted February 11, 2015 then I guess it is plan B Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
HES Posted February 11, 2015 Author Share Posted February 11, 2015 New actuator it is. I figured the manual valves are pretty much trouble free but wanted to get a 2nd opinion Quote Link to comment Share on other sites More sharing options...
hatcity Posted February 11, 2015 Share Posted February 11, 2015 see if there is a repack kit for them. Replace that if you have the time.Easy and quick (usually) to just replace the whole thing, but nice to have a spare unit Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment Share on other sites More sharing options...
HES Posted February 11, 2015 Author Share Posted February 11, 2015 Excellent point I will shoot down to the parts store tomorrow and see if they have a kit. Thanks dood Quote Link to comment Share on other sites More sharing options...
gearhead204 Posted February 11, 2015 Share Posted February 11, 2015 Also some cylinders have a internal spring to assist them to ether extend or retract, be cautious and check the cyl. before disassembly. see if you can by hand extend or retract the ram. if so its safe to disassemble if resistance if felt proceed with caution if you are comfortable working with caged springs, if not have a pro install the kit. Quote Link to comment Share on other sites More sharing options...
HES Posted February 12, 2015 Author Share Posted February 12, 2015 Problem has been solved....air cylinder was definitely on its way out. Also found that the exhaust port on the gate valve (4 way with 5 ports total) was either pinched or plugged not allowing air to exhaust through valve. Valve has 2 ports on one side and 3 on other (aro valve) 1 Quote Link to comment Share on other sites More sharing options...
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