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  1. E

    Gehl 6640 hydraulics disengaged

    My 2009ish Gehl 6640 rather suddenly stopped all hydraulic control to drive motors and lift/bucket as if the safety control switch had tripped or the parking brake was engaged. Happened once while operating aux hydraulic (would only lower the attachment/arms, no drive), cleared quickly, then...
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    Gehl 6640 Overheating

    Not sure, I'll have to open the ROPS and lase the pump next time while it's hot, I'll be using it again on Tuesday. Do you mean the main hydraulic pump vs the main control valve, or the drive motors vs the main control valve?
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    Gehl 6640 Overheating

    I immediately measured the temp after shutting down for the alarm, I definitely hope that it's just the sensor! I only cleaned the oil cooler externally, sorry I wasn't clear. I'll see about ordering a new sensor, I'm not 100 percent sure the switch on the manifold is the sensor that controls...
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    Gehl 6640 Overheating

    Hey Guys, thanks, sorry I didn't see there were replies before today. its been raining most of the last week so I have had little opportunity to look at it. I just replaced the engine temp sensor and gauge today to get a good idea of the engine temp. it is oil cooled so I figure there is at...
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    Gehl 6640 Overheating

    Hello, I need help troubleshooting a 2009 Gehl 6640, Tandem pump, hi and lo flow, duetz engine. This machine was bought at auction and I have been working on getting it running correctly. It was full of dirt and heavily leaking hydraulics, so far I've cleaned it out, taken out the dual hydraulic...
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