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  1. #1
    New Member
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    Apr 2014
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    21
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    Dry Ridge
    Tractor
    MF GC1705

    Default GC1705 - Mower Deck Height Adjustment - Won't Lock in the up position?

    With or without the mower, when the mower arms are raised to full up, if I adjust the knob to lock they still go down if I try to lower the 3pt arms.

    Dropped it at the dealer today and they said they've never seen one that worked - they are looking into it - but anyone that owns one - does yours work?

    Thanks,
    Chris

  2. #2
    Silver Member
    Join Date
    May 2014
    Posts
    112
    Location
    PA
    Tractor
    Massey GC1710.

    Default

    Nope, no works on my 1710.

  3. #3
    Elite Member irvingj's Avatar
    Join Date
    Feb 2008
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    2,509
    Location
    Etna, NH
    Tractor
    2007 MF GC2310 TLB

    Default Re: GC1705 - Mower Deck Height Adjustment - Won't Lock in the up position?

    Chris, which knob are you referring to?

    The knob to lock the mower deck arms up (at least on my 2310) is simply a threaded rod and a captive nut, beneath the floor. It's marked as "mower deck height." Turning the mower deck height adjustment knob fully clockwise (zero height) will hold the MMM arms up, but still allow the 3PH arms to drop when the 3PH control lever is moved to the down position.

    The other knob goes to a hydraulic valve and prevents back flow to hold the 3PH in the UP position (which will also prevent the MMM arms from dropping, too). They are two separate controls.

    In the pic, the 3PH hydraulic closing valve is on the left, mounted more or less horizontally, and the MMM height adjustment knob is to the right, coming up out of the floor, with the "+/-" symbols on it.

    I guess it depends on what you're trying to do, but on my tractor it's possible to lower the 3PH arms without the mower arms dropping, but NOT possible to lower the MMM without the 3PH arms ALSO dropping. Does this help? ijk

    -3pt-hitch-knob-jpg
    '07 GC2310 TLB, 2360 snowblower, 2325 MMM, Bro-Tek thumb, Woods GTC40-2 tiller, Woods RB-60 back blade, KK TYR-60 landscape rake, DR 60" Power Grader
    '05 VW Jetta Wgn TDI
    Numerous antique Japanese motorcycles

  4. #4
    New Member
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    Apr 2014
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    21
    Location
    Dry Ridge
    Tractor
    MF GC1705

    Default Re: GC1705 - Mower Deck Height Adjustment - Won't Lock in the up position?

    Yes what you are describing is what my 1705 WONT do.

    I want to use the deck height knob turned to max height (the LOCK icon) as shown on the tractor, and detailed in the manual. I expect the deck to stay up then when I lower the 3ph but it doesn't.

    I'm hoping it's an adjustment and not an oversight on the new ones.

    Chris

  5. #5
    Elite Member irvingj's Avatar
    Join Date
    Feb 2008
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    2,509
    Location
    Etna, NH
    Tractor
    2007 MF GC2310 TLB

    Default Re: GC1705 - Mower Deck Height Adjustment - Won't Lock in the up position?

    Wow, that is weird. Oh- guess I should have said "zero drop/MAX height."

    On my tractor, that threaded rod passes through the floor, then through a hole in a bracket-type piece on the forward most of the arms that connect the left side with the right side during raise/drop (it has no grease fitting). In the service manual pic, you can also see a short cylinder that the threaded rod passes through, which is inside a slotted section of that bracket. Very much like the adjustment rod on the rear mechanical brakes of a motorcycle.

    At the bottom, it's held by a washer, a nut, and followed by a jamb nut. In the photo, it's kinda upside down, looking up at it from beneath the tractor. It's just inboard of the left side of the frame. In the shot from the service manual, it's #3, on the far right.

    Any possibility yours has somehow become detached? As far as I know, the "hold up" feature is strictly mechanical. Almost sounds as if the nut(s) or that short cylinder aren't there.

    -dsc05482-jpg-dsc05479-jpg
    '07 GC2310 TLB, 2360 snowblower, 2325 MMM, Bro-Tek thumb, Woods GTC40-2 tiller, Woods RB-60 back blade, KK TYR-60 landscape rake, DR 60" Power Grader
    '05 VW Jetta Wgn TDI
    Numerous antique Japanese motorcycles

  6. #6
    New Member
    Join Date
    Apr 2014
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    21
    Location
    Dry Ridge
    Tractor
    MF GC1705

    Default Re: GC1705 - Mower Deck Height Adjustment - Won't Lock in the up position?

    Thanks for the time - the dealer called and said that the deck will drop some, not all the way, but a few inches in lock mode - does yours do that?

    Thanks for the pic of the FSM page!

    Chris

  7. #7
    Super Member
    Join Date
    Dec 2003
    Posts
    7,507
    Location
    NC
    Tractor
    Kubota Grand L3830

    Default Re: GC1705 - Mower Deck Height Adjustment - Won't Lock in the up position?

    Quote Originally Posted by ChrisInKY View Post
    Yes what you are describing is what my 1705 WONT do.

    I want to use the deck height knob turned to max height (the LOCK icon) as shown on the tractor, and detailed in the manual. I expect the deck to stay up then when I lower the 3ph but it doesn't.

    I'm hoping it's an adjustment and not an oversight on the new ones.

    Chris
    Look on your lift arms, the left one and the right one, you will probably see a bronze rod attached to each running forward. When you raise the 3ph force is placed on the bronze rods, pulling them to the rear. Since your mower is stationery and secured by the front attachment, this forces the mower deck upward. Lower the 3ph and the lift arms relax the rearward pressure, and the mower deck goes down. Tightening the knob underneath the seat will lock the mower deck and 3ph arms in the up position. The only way to operate both separately is to install a independent lifting and lowering system for the mowing deck.

  8. #8
    Silver Member
    Join Date
    May 2014
    Posts
    112
    Location
    PA
    Tractor
    Massey GC1710.

    Default

    Quote Originally Posted by ChrisInKY View Post
    Thanks for the time - the dealer called and said that the deck will drop some, not all the way, but a few inches in lock mode - does yours do that? Thanks for the pic of the FSM page! Chris
    Yup, in the locked position the mower still lowers some, just not all the way. At least on mine.

  9. #9
    Gold Member jeepcj7's Avatar
    Join Date
    Oct 2004
    Posts
    325

    Default Re: GC1705 - Mower Deck Height Adjustment - Won't Lock in the up position?

    Ask your dealer to contact MF - there is a solution for this. Basically need to weld in a spacer or shim onto the linkage and it resolves the issue. I was told they are working on a more permanent solutiuion.

  10. #10
    New Member
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    Aug 2015
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    1
    Location
    Southeastern Ky
    Tractor
    Massey Ferguson GC1705

    Default Re: GC1705 - Mower Deck Height Adjustment - Won't Lock in the up position?

    I have a GC 1705 and it will not lock in the up position.

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