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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JCB Clutch issues

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JCBBob

05-11-2012 06:03:13
206.158.37.186



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I have a JCB 1400B extenda hoe with a 4.236 Perkins and shuttle reverser trans. machine # 317927/7. Two questions; first I get amomentary buzz when I shift the machine into reverse,the filter clean, fluid changed and full no apparent slipping or trans problems, any ideas about the buzz? Second, just lately the clutch stopped disengaging can"t shift between gears on the fly and macine will continue to go forward or reverse with the clutch in. the linkage is good the rod moves in and out of the trans ok, any ideas? I have a shop manual, but no gauges to check trans, I"m handy with wrenches and can fix about anything, if anyone has a diagnosis I"d appreciate it moneys tight so if I can fix it myself I will. Thanks in advance for any help.

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AJ.

05-11-2012 14:42:02
92.4.143.172



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 Re: JCB Clutch issues in reply to JCBBob, 05-11-2012 06:03:13  
I"m in the UK and am familar with JCB"s but there is a problem export machines are badged different than the ones for the home market,the machine I think you have would be an early 3CX here and there is as many models of that machine as days in a month,the mechanical clutch cut out is the only clue I have as to what you got,the machine would have a Borg Warner Velvet Shift shuttle,the F/R is cable operated,the clutch dump valve has a mechanical linkage,there is adjustment on the end of the valve that should be set to .010" between the adjustment bolt and the lever that pushes it,when the valve is pushed in oil that is holding the clutch pack compressed is released and the clutch disengages,check that clearance and make sure the linkage is pushing the valve in all the way,for the valve adjustment get a second person to move the F/R lever and you will see the control valve lever moving,in the centre is the adjusting bolt,you need two 7/16 wrenches,loosen the jam nut and turn the bolt till you have the .010",about the buzz it must be a bare wire grounding when you move the lever,look in that area,move the loom a bit.
Good luck
AJ

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BCnT

05-11-2012 11:30:00
68.65.150.242



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 Re: JCB Clutch issues in reply to JCBBob, 05-11-2012 06:03:13  
i'm not familar with your machine at all but if it was anything else and had a friction type main clutch,i'd say clutch needs adjusting.



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