nohasslekindaguy 3 #1 Posted October 5, 2021 (edited) I have a 1974 d200. The hydro seems to work fine in both directions, but it rolls free in neutral. I assume this shouldn't happen since the brake pedal shifts it to neutral. Any ideas on what could be wrong? Edited October 5, 2021 by nohasslekindaguy Share this post Link to post Share on other sites
Achto 27,751 #2 Posted October 5, 2021 Tagging along to hear the answers. Share this post Link to post Share on other sites
Maxwell-8 4,290 #3 Posted October 5, 2021 Is it hard to push forward? Share this post Link to post Share on other sites
nohasslekindaguy 3 #4 Posted October 5, 2021 It seems to be the same either direction. When in neutral, I can rock the tractor just by rolling the tire back and forth. Share this post Link to post Share on other sites
pacer 3,174 #5 Posted October 5, 2021 (edited) 2 hours ago, nohasslekindaguy said: but it rolls free in neutral. By "rolls free" is it like the movement when you turn the release valve - somewhat stiff but can easily push by hand? I think its pretty normal to have the wheels to move .... maybe 8-10"? or so (at least all I ever had did) and then stiffen up. If it really does 'roll free', thats a new one on me, maybe one of the guys more familiar will chime in...... Edited October 5, 2021 by pacer Share this post Link to post Share on other sites
nohasslekindaguy 3 #6 Posted October 5, 2021 (edited) Ok I have to ask a dumb question, where is the release valve? All I know is when its on a hill in neutral it rolls. Yes it easily rolls by hand. The guy I bought it from was fiddling with something under the seat. Is there a valve under there? Thanks for the help by the way. Edited October 5, 2021 by nohasslekindaguy Share this post Link to post Share on other sites
Gregor 4,847 #7 Posted October 5, 2021 3 hours ago, nohasslekindaguy said: When in neutral, I can rock the tractor just by rolling the tire back and forth. Will it roll several feet? 55 minutes ago, nohasslekindaguy said: Yes it easily rolls by hand. Or simply rock back and forth? Share this post Link to post Share on other sites
nohasslekindaguy 3 #8 Posted October 5, 2021 Yes, several feet and in either direction. I never had a hydro, so it's all new to me. Share this post Link to post Share on other sites
pacer 3,174 #9 Posted October 5, 2021 1 hour ago, nohasslekindaguy said: where is the release valve? Sitting in the seat - on the left side panel below and about inline with the battery is a round hole maybe 3/4-1" - peep inside there (prolly need a flashlight) and should see one of 2 types (that I know of) One is a square head and other takes a flat blade screwdriver - the square head will take a 3'8" ratchet extension. There should? be a decal, but all too often is missing. To release turn counter clockwise about I turn, tighten clockwise till snug. They are rather notorious for being stuck in the closed position, The screwdriver type is bad about getting ... wallowed? out and cant get a grip on. I've had 2 D's that only way I got them loose was to remove the unit. Share this post Link to post Share on other sites
nohasslekindaguy 3 #10 Posted October 5, 2021 Thanks I'll check that. Share this post Link to post Share on other sites
Gregor 4,847 #11 Posted October 5, 2021 Not much available for a '74 D series tractors as far as manuals. I did find this for a '75. They both appear to have a Sundstrand 90-1137 hydro unit, so maybe this pic is accurate for the '74 also. I have never seen one, but it looks like what @paceris describing above. Not much to go on, but it's all I can find. Share this post Link to post Share on other sites
8ntruck 7,082 #12 Posted October 5, 2021 What kind of hydro unit is on the tractor? If it is an Eaton 11 series, you can push the tractor in neutral - but only at a slow walking speed. If the hydro is a Sunstrand, it will have a tow valvethat must be opened to prevent internal damage from moving or pushing the tractor in neutral. Disclaimer - I have owned an Eaton 11 series for about a month. I've never been inside of it. My knowledge of Sunstrands is book knowledge only. Share this post Link to post Share on other sites
Gregor 4,847 #13 Posted October 5, 2021 (edited) Again this info is for a "75 D-200, so I can't say it's accurate for a "74. Edited October 5, 2021 by Gregor Share this post Link to post Share on other sites
nohasslekindaguy 3 #14 Posted October 6, 2021 (edited) Thanks for all the help. Basically my problem is that the brake does nothing. I will check that the bypass valve is closed. Am I correct in saying that neutral should act as a brake? Edited October 6, 2021 by nohasslekindaguy Share this post Link to post Share on other sites
Gregor 4,847 #15 Posted October 6, 2021 I get a little confused reading about the brakes on this tractor. Do you have brake pedals on both sides? If so, the right side are turning brakes. Share this post Link to post Share on other sites
nohasslekindaguy 3 #16 Posted October 6, 2021 Yes I have the turning brakes. The pedal on the left is marked as a brake and it just pushes the control lever to neutral. Share this post Link to post Share on other sites
pfrederi 17,866 #18 Posted October 6, 2021 Parking brake has nothing to do with the free roll issue. It activates the parking pawl in the transaxle. Make sure the tow valve is closed (Pic) Does the tractor have good power forward and backward. if you put it up against a solid object will she dig holes with the rear wheels when you try to push it??? (Try this both forward and backwards) If it doesn't dig in then your hydro is worn. if it will only in one direction then there are other possibilities. Download the sundstrand manual here and look at the diagnostic pages Share this post Link to post Share on other sites
nohasslekindaguy 3 #19 Posted October 6, 2021 Thanks very much. The hydro feels like is has good power but I haven't pushed against anything yet. I'll look at the sunstrand manual. Share this post Link to post Share on other sites
