Go Bottomdrive problem
 | john errington
Join Date: Posts: 1 
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2001-08-27 31339
I have just bought a ford 1210. Normally it's OK When I try to start it going on an incline in high ratio the wheels dont turn. As I press the hydro pedal the engine slows down & would just stall. It just doesn't seem to have any torque. Is this normal or have I a fault & what suggestions have you?
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2001-08-28 31349
Can't say what is normal for a 1210. I'm a gear tractor guy myself, but I understand that HST's take a little getting used to. There's a tendency to interpret the hydro pedal like the accelerator pedal on a truck. The hydro (or speed) pedal actually changes the drive gear ratio--slow speed equals a lower gear. With HST, if an engine starts lugging you let up on the hydro pedal rather than push it down like on a truck. ....
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| Bird Senter
Join Date: Jun 1999 Posts: 962 
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2001-08-28 31357
John, I'm not familiar with the 1210, but I've had the same thing happen with my tractors if it's too steep an incline and in high range. Sometimes you just have to use a lower range. ....
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| john errington
Join Date: Posts: 1
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2001-08-28 31372
Thanks for the rapid responses. I thought the HST acted like a variable drive ratio, glad to have it confirmed.
I have discovered that the problem (low torque) only arises when the hydraulic lift is fully up. In this position the lift arm contacts the chassis, and the engine starts to strain. I wonder if this is taking most of the engine power? Anyway I'm learning all the time. I still think its a great machine. ....
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| Bird Senter
Join Date: Jun 1999 Posts: 962
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2001-08-28 31374
John, I'm not sure if I understand exactly what's happening with your 3-point, but if I understand it right, it sounds as if it needs a minor adjustment. You don't want it to raise to its maximum height before the valve closes; i.e., raised to maximum height, trying to raise higher, and the relief valve opening. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2001-08-29 31393
The 3ph adds an interesting wrinkle to the problem. Bird's comment definitely should be checked. If you're not aware of it, the pressure relief valve sounds like a squeal when it opens. Running a loader to the end of cylinder travel and holding the valve for a few seconds will open the valve. It's good to recognize the sound, and a tractor shouldn't be operated for too long with the relief valve open. Another possibility is a marginally low oil level. The lift cylinder is filled with oil when the 3ph is up, which reduces the reservoir level. It's not uncommon for a person to charge cylinders on a new implement from the tractor hydraulics and then forget about checking the oil level. I don't know if it's standard practice, but I check my levels without screwing the dipstick back in. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2001-08-29 31398
John: My use of the term 'gear ratio' to apply to something that doesn't have gears (except for the range) is ironic. Same idea though. Most, if not all, HST pumps are variable displacement types. For example, the HST speed pedal changes the length of the pump stroke, which delivers from very little oil to a maximum displacement. It doesn't take an engine much effort to turn a pump that delivers little oil, but the tractor doesn't move much either. More speed means more oil pumped, which makes the engine work harder. It's a hydraulic rather than a gear mechanical advantage. ....
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