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  1. #1
    New Member
    Join Date
    Mar 2013
    Gainesville, Ga.
    Yanmar 550 Trackhoe

    Default older yanmar trackhoe

    Why does my main boom go down before it goes up when I pull back the main boom lever. Is it air in the system and how would I purge it? Thanks.

  2. #2
    Super Star Member Gary Fowler's Avatar
    Join Date
    Jun 2008
    Bismarck Arkansas
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: older yanmar trackhoe

    I don't know the reason but my Yanmar 4220D tractor with FEL did the same thing with the FEL after it was used for a few years. It must be a problem in the joy stick valve. I never fixed mine and sold it as is.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  3. #3
    Elite Member
    Join Date
    Dec 2009
    gilmer tx
    Bobcat CT235

    Default Re: older yanmar trackhoe

    I'll start by saying I am no hydraulic guru and only stating here what I found from a little googling. It seems the load checks might be the cause of the dropping. Also seems the springs might be the weak link. I am attaching a prince parts drawing just so you you might see just what these parts are.

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