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  1. #1
    Member
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    Oct 2010
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    37
    Location
    Pilot Point TX
    Tractor
    Mahindra 4035

    Default 850 Jumps out of gear

    I have an 850 that likes to jump out of some gears. It especially likes to jump out of reverse and first. I don't use 4th and 5th too much so I don't know if it likes to jump out of those. Second and third seem fine. It seems that all the gears it likes to jump out of are the ones with the shifter to the rear.

    I know that some transmissions have "detent" balls that click the shifter into gear. I have printed off the parts diagrams for the transmission from the New Holland site and can't find any reference to these on this tractor.

    Any ideas why it keeps jumping out of gear? I am planning on splitting the tractor later this year since I am pretty sure it needs a clutch (it slips).

    Thanks in advance.

    Gayle Linke

  2. #2
    Old Timer Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 850 Jumps out of gear

    I think you may have either printed the wrong diagrams off, or didn't read the parts listing.

    here's the listing and the diagram in question.. I'll help ya out with some black ink. pay close attention to # 10, 11,12,13

    1 1 NLS No Longer Serviced Transmission Assy., L/Gear Shift Cover, Single Clutch, Before S/N 14257 {NDA7001D}, Years: 01/01/1955-12/31/1957
    1 1 NLS No Longer Serviced Transmission Assy., L/Gear Shift Cover, Double Clutch, BSN 14257 {NDA7001E}, Years: 01/01/1955-12/31/1957
    1 1 NLS No Longer Serviced Transmission Assy., L/Gear Shift Cover, 10" Single Clutch, After S/N 14256 {310832}, Start Year: 01/01/1958
    1 1 NLS No Longer Serviced Transmission Assy., L/Gear Shift Cover, 9' Double Clutch, ASN 14256 {310872}, Start Year: 01/01/1958
    1A 1 NDA7005B Case Assy., Transmission W/Brake Shaft Thru Transmission, Before S/N 14257, No Longer Serviced, Years: 01/01/1955-12/31/1957
    1A 1 NLS No Longer Serviced Case Assy., Transmission W/Brake Shaft, Under Center Housing, After S/N 14256 {310836}, Start Year: 01/01/1958
    1B 2 NDA7508A BUSHING Bushing, Cross Shaft, Start Year: 01/01/1955
    AR PL PROCURE LOCALLY Nut, Hex, 7/16"-14
    2 PL PROCURE LOCALLY Bolt, 7/16"-14 x 1.38, Years: 01/01/1955-12/31/1957
    AR PL PROCURE LOCALLY Nut, Hex, 7/16"-14
    AR PL PROCURE LOCALLY Washer, Flat, 7/16"
    AR PL PROCURE LOCALLY Bolt, 7/16"-14 x 1.38
    AR PL PROCURE LOCALLY Nut, Hex, 5/8"-18
    2 PL PROCURE LOCALLY Bolt, 5/8"-18 x 3.12, Start Year: 01/01/1955
    1 PL PROCURE LOCALLY Bolt, Hex, 7/16"-14 x 1", Start Year: 01/01/1955
    4 PL PROCURE LOCALLY Bolt, 7/16"-14 x 1.50, Start Year: 01/01/1955
    2 PL PROCURE LOCALLY Bolt, HH, 7/16"-14 x 1.94, Start Year: 01/01/1955
    2 73279S PIN Pin, Dowel, 3/8" x .75, No Longer Serviced, Start Year: 01/01/1955
    1 PL PROCURE LOCALLY Pin, Cotter, 7/32" x 1, Start Year: 01/01/1955
    3 74116S PLUG Plug, Expansion, 15/16", Start Year: 01/01/1955
    2 1 NLS No Longer Serviced Plate, Engine Rear Cover, 1/4" Thick, 4000 Row Crop Only {310836}, Years: 01/01/1955-12/31/1957
    2 1 310741 Plate, Engine Rear Cover, 1/8" Thick, All Purpose Only, No Longer Serviced, Start Year: 01/01/1958
    2 1 NLS No Longer Serviced Plate, Engine Rear Cover, 1/4" Thick, 4000 Row Crop Only {310767}, Start Year: 01/01/1958
    3 1 NCA7306A Cover, Transmission Vase Front Lower, No Longer Serviced, Start Year: 01/01/1955
    4 1 14457281 O-RING O-Ring, -114, Cl 7, .612" ID x .103" Thk, Start Year: 01/01/1955
    5 1 87055S92 O-RING O-Ring, 1.125" ID x .139" Thk, Start Year: 01/01/1955
    6 1 NCA7518A Cover, Transmission Inspection Hole, No Longer Serviced, Start Year: 01/01/1955
    7 4 PL PROCURE LOCALLY Bolt, HH, 5/16"-18 x 5/8", Start Year: 01/01/1955
    8 AR PL PROCURE LOCALLY Pin, Cotter, 5/32"x 1"
    9 2 NLS No Longer Serviced Plug, Square Hd., 1/4"-14 {87604S}, Start Year: 01/01/1955
    10 4 NDA7233A PLUNGER Plunger, Transmission Gear Shifter Interlock, Start Year: 01/01/1955
    11 4 83407013 SPRING Spring, Transmission Gera Shift Rail, Start Year: 01/01/1955
    12 1 E5NN7Z307AA GASKET O-Ring, Pressure Tube Between Center Housing & Transmission Case, Start Year: 01/01/1955
    13 4 747238 PLUG
    14 1 NDA7240A Rail, Transmission 1st & 2nd Gear Shifter, No Longer Serviced, Start Year: 01/01/1955
    15 1 NDA7241A Rail, Transmission 4th & 5th Gear Shifter, No Longer Serviced, Start Year: 01/01/1955
    16 1 NDA7242A Rail, Transmission 3rd & Reverse Gear Shifter, No Longer Serviced, Start Year: 01/01/1955
    17 2 PL PROCURE LOCALLY Pin, Dowel, 1/4" x 1/2", Start Year: 01/01/1955
    18 1 B9NN16A795A GASKET Gasket, No Longer Serviced, Start Year: 01/01/1955
    19 1 NDA7723C BRACKET Bracket, Transmission Reverse Idler Gear, No Longer Serviced, Start Year: 01/01/1955
    20 AR PL PROCURE LOCALLY Washer, Lock, 7/16"
    21 AR PL PROCURE LOCALLY Nut, Hex, 7/16"-20
    22 6 PL PROCURE LOCALLY Bolt, Self-Locking, 7/16"-14 x 1", Start Year: 01/01/1955
    23 2 186397 Pin, Transmission Reverse Idler Gear Bracket Dowel, No Longer Serviced, Start Year: 01/01/1955
    24 1 14466080 O-RING O-Ring, 3.984" ID x .139" Thk, Bracket Transmission Case, Start Year: 01/01/1955
    25 1 NDA7141A GEAR Gear & Bushing Assy., Transmission Reverse Idler, No Longer Serviced, Start Year: 01/01/1955
    26 1 NDA7140A SHAFT Shaft, Transmission Reverse Idler Gear, Start Year: 01/01/1955
    27 1 NDA7143A BRONZE BUSHING Bushing, Reverse Idler Gear, Start Year: 01/01/1955
    28 1 NDA7149A WASHER Washer, Transmission Reverse Idler Thrust, Front, Start Year: 01/01/1955
    29 1 NDA7029A THRUST WASHER Washer, Transmission Reverse Idler Thrust, Rear, No Longer Serviced, Start Year: 01/01/1955
    30 5 8N7245 SCREW Screw, Transmission Frok Lock, Start Year: 01/01/1955
    31 5 PL PROCURE LOCALLY Nut, Hex, 3/8"-24, Start Year: 01/01/1955
    32 1 NDA7230C FORK Fork, Transmission 4th & 5th Gear Shifter, No Longer Serviced, Start Year: 01/01/1955
    33 1 PL PROCURE LOCALLY Screw, 3/8"-24 x 2.04, Start Year: 01/01/1955
    34 1 NDA7231B Fork, Transmission Low & 2nd Gear Shifter, No Longer Serviced, Start Year: 01/01/1955
    35 1 NDA7289B FORK Fork, Transmission 3rd & Reverse Gear Shifter, No Longer Serviced, Start Year: 01/01/1955
    36 1 NDA7279B Gate, Transmission Gear Shifter Low & 2nd, No Longer Serviced, Start Year: 01/01/1955
    37 1 NDA7411B Gate, Transmission 3rd & Reverse Shifter Shaft, No Longer Serviced, Start Year: 01/01/1955
    38 1 NDA7229D LOCK Lock, Interlock, Gear Shift, Start Year: 01/01/1955
    39 1 NDA7212A SHAFT Shaft, Transmission Gear Shift, No Longer Serviced, Start Year: 01/01/1955
    40 1 NDA7223A GASKET Gasket, Gear Shift Cover, Start Year: 01/01/1955
    41 1 NDA7211B Cover Assy., Transmission, No Longer Serviced, Start Year: 01/01/1955
    42 10 PL PROCURE LOCALLY Bolt, HH, 3/8"-16 x 3/4", Start Year: 01/01/1955
    43 1 8N11500 IGNITION SWITCH Switch Assy., Starter Push, Start Year: 01/01/1955
    44 1 8N11529 GASKET Gasket, Starter Switch, Start Year: 01/01/1955
    45 AR PL PROCURE LOCALLY Washer, Lock, 3/4"
    46 1 PL PROCURE LOCALLY Nut, Hex, 3/4"-16, Start Year: 01/01/1955
    1 PL PROCURE LOCALLY Screw & Washer, #8-32 x .25 Round Hd., Start Year: 01/01/1955
    47 1 9N7010 PLUG Plug or Cap, Transmission Filler, Start Year: 01/01/1955
    48 1 8N7011 GASKET Seal, Gear Shift Lever, Start Year: 01/01/1955
    49 1 C5NN7277C SEAL Seal, Gear Shift Lever, Replaces P/N C0NN7277A, Start Year: 01/01/1955
    50 1 NDA7202A Lever, Gear Shift, No Longer Serviced, Start Year: 01/01/1955
    51 1 PL PROCURE LOCALLY Key, Woodruff, 1/8" x 5/8", Start Year: 01/01/1955
    52 AR PL PROCURE LOCALLY Washer, Flat, 3/8"
    53 AR PL PROCURE LOCALLY Washer, Internal Tooth, 3/8"
    54 1 PL PROCURE LOCALLY Nut, Blind, 3/8"-24, Start Year: 01/01/1955
    55 1 83905584 BALL Ball Assy., Transmission Gear Shift Lever, Start Year: 01/01/1955
    56 1 NLS No Longer Serviced Rod, Interlock, Gear Shift {NDA77213A}, Start Year: 01/01/1955
    57 1 NDA7227A Spring, Gear Shift Lever, No Longer Serviced, Start Year: 01/01/1955
    58 1 NDA7288A Seal Assy., Transmission Shifter Shaft Only, No Longer Serviced, Start Year: 01/01/1955


    Quote Originally Posted by glinke View Post
    I have an 850 that likes to jump out of some gears. It especially likes to jump out of reverse and first. I don't use 4th and 5th too much so I don't know if it likes to jump out of those. Second and third seem fine. It seems that all the gears it likes to jump out of are the ones with the shifter to the rear.

    I know that some transmissions have "detent" balls that click the shifter into gear. I have printed off the parts diagrams for the transmission from the New Holland site and can't find any reference to these on this tractor.

    Any ideas why it keeps jumping out of gear? I am planning on splitting the tractor later this year since I am pretty sure it needs a clutch (it slips).

    Thanks in advance.

    Gayle Linke
    Attached Thumbnails Attached Thumbnails 850 Jumps out of gear-850transm-gif  

  3. #3
    Old Timer Soundguy's Avatar
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 850 Jumps out of gear

    ok.. now that I've id'd the plunger and depent springs for ya, you canuse a bit flatblade screwdriver and pull them.

    if the nubs have wear, replace them. CNH sells them.

    if 4/5 is not worn, which it usually isn't, swap it into one of the others and see if it helps.

    jumping out of gear is pretty common on 3 & R as it gets used alot. I have an 850 with a loader that will do it.. especially if you gas on it alot and then let off or go down hill.

    I use a bunji to hold it in.

    In some cases you get lucky and it's a weak spring or worn detent plunger, many times it's wear in the gearing allowing it to do so. for the heck of it check the shifter forks and rails and make sure it is actually fully shifting into gear in the first place.

    soundguy

  4. #4
    Member
    Join Date
    Oct 2010
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    Location
    Pilot Point TX
    Tractor
    Mahindra 4035

    Default Re: 850 Jumps out of gear

    Thanks! That was the picture that I had, I just didn't equate "plunger" with "detent" or "ball". I was looking more in the area of part 36. I am taking off tomorrow and will look at them then. Thanks for your help!

    Gayle Linke

  5. #5
    Elite Member wmonroe's Avatar
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    Nov 2005
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    Southwestern, PA
    Tractor
    1958 Ford 961 Powermaster

    Default Re: 850 Jumps out of gear

    I also have an issue with my 961 jumping out of 4th when coasting down a hill. it will stay in gear when a load is on the tranny, when going up a hill. Am i looking at a worn 4th & 5th gear shift fork, part 32 in the diagram?
    Thanks
    Kubota L5240 with loader and backhoe

    1958 Ford 961 Powermaster LP

  6. #6
    Old Timer Soundguy's Avatar
    Join Date
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    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 850 Jumps out of gear

    very doubtfull.. nil in fact.. that a shift fork would make it jump out of gear in that situation.

  7. #7
    Elite Member wmonroe's Avatar
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    1958 Ford 961 Powermaster

    Default Re: 850 Jumps out of gear

    probably a bad gear then?
    Kubota L5240 with loader and backhoe

    1958 Ford 961 Powermaster LP

  8. #8
    Old Timer Soundguy's Avatar
    Join Date
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    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 850 Jumps out of gear

    any howling coming from the trans?

  9. #9
    Elite Member wmonroe's Avatar
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    1958 Ford 961 Powermaster

    Default Re: 850 Jumps out of gear

    No. In fact it is perfect in all other gears and i have just not been using 4th. No abnormal noises.
    Kubota L5240 with loader and backhoe

    1958 Ford 961 Powermaster LP

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