Do all newer Mahindra tractors have a high rpm at idle? I am used to older tractors that will idle down to allow for safer hook ups to 3 point equipment. Is there any way to idle these engines down or are they required to idle at a higher speed?
3540 Idle Speed
- Thread starter donmacky
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oosik
Epic Contributor
I sure hope you are talking about some form of "quick connect - hands free" equipment hook ups. I know of NOBODY that recommends manual connection of equipment while the tractor is still running.
I have no idea on the recommended idle speed on your tractor.
I have no idea on the recommended idle speed on your tractor.
If it is made by TYM in may be high. I have a TYM 45H and it is set about 900rpm. I don't like it that high and when I ever get a ODBII tool I am going to set it about 700RPM. All my other tractors are around 5 - 600 RMP. I hook up all my equipment while the tractor is idling. Been doing it for over 35 years.
thepumpguysc
Elite Member
IF this is a computer controlled engine, it probably has to be lowered thru the computer..
IF it has an actual mechanical injection pump?? there IS a low AND a hi idle screw adjustment..
Just follow your throttle linkage down to the engine.. it'll hook up to the throttle assembly.. the screws are there..
UNLESS.. all you have are wires..
IF it has an actual mechanical injection pump?? there IS a low AND a hi idle screw adjustment..
Just follow your throttle linkage down to the engine.. it'll hook up to the throttle assembly.. the screws are there..
UNLESS.. all you have are wires..
burzynsr
Gold Member
- Joined
- Jun 9, 2010
- Messages
- 270
- Location
- Grimes county Texas
- Tractor
- Mahindra 4025 / Kubota RTV500 / Bad Boy ZT Elite 60"
I am probably not the safest person in the world. There is a reason they say to shut it down while hooking up the PTO. I have hooked up stuff that does not need the PTO to operate while the machine is still running (still not the best idea) but never the PTO (gives me the creeps). Idle or full throttle, the results will be the same. In this day and age I am sure that someone can find a picture of the results from getting wrapped up in a PTO shaft. I don't care to look at it. I am fully aware that the machine is not going to just "jump" into gear or PTO operation, just don't see the reason to even let a machine have control over my future. You use your own judgement but the people in the pictures figured they would be safe also. As far as the idle speed just call the dealer and ask them. They should be able to help.
I am sure mine is computer controlled....it is a 2017 model with PST. I normally shut off the engine to hook up, but it is still hard to line up 3 pt implements when backing up with such a high idle speed. I don't have "quick attach" implements.
OLV1071571
Bronze Member
I have a 1 year old 3540 PST and whether its cold or hot it idles at 1,000 RPM. That is as low as it goes on my tractor.
Mine is about a year old too and idles that high. I don't know if it has to because of the hydraulic system or what, but it sure makes it hard to just "ease" back.
I have a call in to my dealer and when I hear back I will let everyone know. I am hoping the rpm's can be lowered with a computer flash or something
I have a call in to my dealer and when I hear back I will let everyone know. I am hoping the rpm's can be lowered with a computer flash or something
dickfoster
Elite Member
I think it might have something to do with the lack of DPF etc. The owners manual says not to operate mine for extended periods a low RPM.
CincyFlyer
Veteran Member
There's likely a reason for the higher RPM, related to emissions equipment. I wouldn't lower it. BTW, on the tractors that use TYM chassis, the engines are Mahindra.
MatHaas
Silver Member
To the best of my knowledge:
I think it's safe to say the idle speed is set at what the engine was engineered for.
The hydraulic pump is also driven by the engine requiring a certain rpm to properly function. The tractor hydraulics are made to function at idle, requiring a certain optimal minimal RPM. Plus operating them adds a slight load to the engine, which can drop the RPM a little, getting it closer to stall RPM.
As far as "easing" back, that's ultimately dependent on the gear ratio. Yes, slower idle will slow the crankshaft turning the trans, but it is much more dangerous having an engine operating at close to stall RPM. What kind of power do you think your engine makes at 500 rpm? Look at a dyno graph, engine output can multiply several factors at just a 500rpm difference. Especially in a diesel when all of the power occurs on the bottom end in a VERY short RPM range. An engine that stalls out in the middle of you doing a specific task is not what anyone wants, nor should it ever occur if you're operating the tractor properly. You should be able to leave the clutch out and maintain the engine speed. A high compression diesel engine will abruptly shut off when approaching stall RPM. A "slower" RPM is not what your engine was designed around. Too slow of engine speed also decreases cylinder temperatures and increases the likelihood of unburned fuel in the combustion chamber, increasing the risk of it getting past your rings and into the engine oil.
So if anything, mahindra needs a lower first gear or a lower low range ratio. but that's it. don't idle your engine down.
my suggestion and personal technique is to ride the brakes a little and barely engage the clutch. That's as good as it'll get. Factory RPM is set and recommended at 1000 rpm. I wouldn't lower it much beyond that IMO. but that's just my two cents.
don't you have adjustable 3 point with telescoping lower arms on this newer tractor? you don't need to get perfectly lined up; the lower arms have a fair amount of telescoping ability. you just depressed the lock, pull them out, hook it up and back up after it's attached to get it to lock back in.
and what's the logic behind suggesting the idle speed is relevant to how the emissions system functions?
A DOC (diesel oxidation catalyst) "is a flow through filter that contains precious metals to start the oxidation of hydrocarbons, carbon monoxide and unburned fuel and oil." Essentially a catalytic converter if i'm not mistaken (which doesn't require high temps to work, opposed to a DPF). The velocity of exhaust gas moving through it wouldn't change how it works. Though, as aforementioned, a very low idle speed does increase the amount of unburned fuel in the combustion chamber. But the DOC functions the same regardless..
best of luck with improving/adjusting to your situation.
I think it's safe to say the idle speed is set at what the engine was engineered for.
The hydraulic pump is also driven by the engine requiring a certain rpm to properly function. The tractor hydraulics are made to function at idle, requiring a certain optimal minimal RPM. Plus operating them adds a slight load to the engine, which can drop the RPM a little, getting it closer to stall RPM.
As far as "easing" back, that's ultimately dependent on the gear ratio. Yes, slower idle will slow the crankshaft turning the trans, but it is much more dangerous having an engine operating at close to stall RPM. What kind of power do you think your engine makes at 500 rpm? Look at a dyno graph, engine output can multiply several factors at just a 500rpm difference. Especially in a diesel when all of the power occurs on the bottom end in a VERY short RPM range. An engine that stalls out in the middle of you doing a specific task is not what anyone wants, nor should it ever occur if you're operating the tractor properly. You should be able to leave the clutch out and maintain the engine speed. A high compression diesel engine will abruptly shut off when approaching stall RPM. A "slower" RPM is not what your engine was designed around. Too slow of engine speed also decreases cylinder temperatures and increases the likelihood of unburned fuel in the combustion chamber, increasing the risk of it getting past your rings and into the engine oil.
So if anything, mahindra needs a lower first gear or a lower low range ratio. but that's it. don't idle your engine down.
my suggestion and personal technique is to ride the brakes a little and barely engage the clutch. That's as good as it'll get. Factory RPM is set and recommended at 1000 rpm. I wouldn't lower it much beyond that IMO. but that's just my two cents.
don't you have adjustable 3 point with telescoping lower arms on this newer tractor? you don't need to get perfectly lined up; the lower arms have a fair amount of telescoping ability. you just depressed the lock, pull them out, hook it up and back up after it's attached to get it to lock back in.
and what's the logic behind suggesting the idle speed is relevant to how the emissions system functions?
A DOC (diesel oxidation catalyst) "is a flow through filter that contains precious metals to start the oxidation of hydrocarbons, carbon monoxide and unburned fuel and oil." Essentially a catalytic converter if i'm not mistaken (which doesn't require high temps to work, opposed to a DPF). The velocity of exhaust gas moving through it wouldn't change how it works. Though, as aforementioned, a very low idle speed does increase the amount of unburned fuel in the combustion chamber. But the DOC functions the same regardless..
best of luck with improving/adjusting to your situation.
Last edited:
MatHaas
Silver Member
You idle a diesel for a short amount of time to get the oil temp up to normal operating temps to properly lubricate the engine, etc. But a diesel requires a load to increase cylinder temperatures and effectively burn all of the fuel that is delivered. Hence, you shouldn't leave it idling for very long without operating it because it will have a slight excess of fuel in the combustion chamber. Not ideal for prolonged periods, as explained above.
