Gehl 6640 no hydraulics

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e_hutch

New member
Joined
Aug 31, 2021
Messages
1
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 happened again with bucket only while moving dirt, hydraulics will not engage anymore. Seat and harness switch appear to opperate normal and illuminate/extenguish the parking brake light as it should. what's the next likely culprit? Thanks!
 

scottster

Member
Joined
Apr 14, 2017
Messages
8
When my 6635 did something similar it was due to the drive coupling failing between the engine pto shaft and the tandem pumps. $12 coupling, but requires pulling the tandem pump to access.
 

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