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  1. #21
    Platinum Member kneedeep's Avatar
    Join Date
    Apr 2012
    Posts
    566
    Location
    Central AL & MS Delta
    Tractor
    Mahindra 3510

    Default Re: Mahindra 3720 backhoe for the 3016

    QUOTE=DavesTractor;3142689]When you extend the bucket ram all the way, it is at it's weakest point. Hydraulically extending or retracting the bucket only at that point will not bend the ram, as the pressure relief prevents that from happening. But if you leave the bucket ram well extended and then put a bunch of additional force on that ram with the boom cylinder, that can bend or break a ram. You see, on most compact backhoes, there is no way for the oil in the bucket ram to relieve itself when the spool for that cylinder is closed. There are ways to plumb in a load relief (wrong term I think) that will let the bucket hydraulically uncurl, but typically smaller backhoes do not have them. I've bent a bucket ram or two on 10k lb mini-excavators digging out stumps before I figured out what was happening. If you understand the dynamics, which took me a while, you tend to not bend the bucket rams.[/QUOTE]

    Are you talking about curling the bucket in, which extends the cylinder out and pulling up with the boom? I can see how that move would bend or break the cylinder as the ram is at a weak point.
    The pic of my unit on a pallet has the curled and the cylinder completly extended.

    Mahindra 3720 backhoe for the 3016-509-pallet-2-.jpg
    PROUD AIR FORCE DAD


  2. #22
    Elite Member
    Join Date
    Sep 2002
    Posts
    2,900
    Location
    Red Bluff, CA
    Tractor
    Changes often!

    Default Re: Mahindra 3720 backhoe for the 3016

    Quote Originally Posted by kneedeep View Post
    Are you talking about curling the bucket in, which extends the cylinder out and pulling up with the boom? I can see how that move would bend or break the cylinder as the ram is at a weak point.
    The pic of my unit on a pallet has the curled and the cylinder completly extended.

    Click image for larger version. 

Name:	509 on pallet (2).jpg 
Views:	184 
Size:	123.4 KB 
ID:	307522
    Yes, that is the idea. By the way, it is possible to put a relief in the system between the cylinder and the main valve that dumps the excess pressure to tank in situations like this. It eliminates the possibility of this sort of breakage, but it really isn't needed. We retail dozens of backhoes a year and we see less than one of these bent rams a year....and the cause is predictable. Now if I were to put a 3720 into a rental fleet, I'd put a relief on it.
    Dave
    Red Bluff, California

  3. #23
    Elite Member bindian's Avatar
    Join Date
    Feb 2007
    Posts
    4,509
    Location
    Willis, Texas
    Tractor
    Mahindra 6520 4WD

    Default Re: Mahindra 3720 backhoe for the 3016

    Quote Originally Posted by kneedeep View Post
    Are you talking about curling the bucket in, which extends the cylinder out and pulling up with the boom? I can see how that move would bend or break the cylinder as the ram is at a weak point.
    The pic of my unit on a pallet has the curled and the cylinder completly extended.

    Click image for larger version. 

Name:	509 on pallet (2).jpg 
Views:	184 
Size:	123.4 KB 
ID:	307522
    Kneedeep,
    I think you won't have to worry about that with your 509. Over 700 hours on my 511, if something was going to break or bend.... I would have done it already. All I have had was a leaking swing cylinder, which Mahindra has a complete rebuild kit for.
    hugs, Brandi

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