International 454 Low Power

[Kevin Field]

I purchased a 1972 International 454 diesel with a loader about 2 1/2 years ago. All was fine for the first year, then it started to lose power on grade, even when in first gear. Lots of black smoke and little power. I read many forums on the matter in order to try to diagnose the problem and have tried all the suggestions, without success. I changed the fuel lines and tank, changed the filters and checked the injectors. I noticed while driving it one day that when going down a grade, as I pushed the clutch pedal in, the tractor stopped moving. I jacked up the rear and found that the back tires barely turned by hand. When in gear with the rear raised, the brakes and parking brake both worked fine. I came to the conclusion that the lack of power is because something is preventing the rear from turning easily and causing a load on the engine. The rear is full of clean gear oil. Does anyone have any ideas or is familiar with this issue?

 

[used red MN]

I purchased a 1972 International 454 diesel with a loader about 2 1/2 years ago. All was fine for the first year, then it started to lose power on grade, even when in first gear. Lots of black smoke and little power. I read many forums on the matter in order to try to diagnose the problem and have tried all the suggestions, without success. I changed the fuel lines and tank, changed the filters and checked the injectors. I noticed while driving it one day that when going down a grade, as I pushed the clutch pedal in, the tractor stopped moving. I jacked up the rear and found that the back tires barely turned by hand. When in gear with the rear raised, the brakes and parking brake both worked fine. I came to the conclusion that the lack of power is because something is preventing the rear from turning easily and causing a load on the engine. The rear is full of clean gear oil. Does anyone have any ideas or is familiar with this issue?

Hello Kevin welcome to YT! Did you check the air intake for a some type of a restriction such as a bird or mouse nest? Number 5 in the link. Messicks IH 454 parts diagram An intake restriction on a diesel will cause increased smoke a loss of power. On the rear end I would suggest jacking it up and opening the brake bleeder to see if that frees up the wheel to turn. They are number 27 in this link. Messicks IH 454 rear end They should be on the side of the trans top cover in front of the 3 point rock shaft.

 

[RedMVa]

Sounds like the brakes are dragging, and if they are you don’t want to keep running it. It will wear the brake disc down to metal and you will have a very costly repair. There is an eccentric adjustment bolt that the master cylinder rod bolts to, you might check that. It can wear and if out of adjustment it can let pressure thru the masters to the brake pistons. As UR said, jack it up and loosen a bleeder and see if you can turn the wheel, it would be first thing to check

 

[JimB2]

I remember an old IH mechanic talking about the very early IH 54/74 tractors having a problem with the hydraulic brakes dragging because there was to much pressure on the hydraudraulic brake feed line from the oil cooler return. IH engineering's solution was to put the orifice/screens in the brake master cylinder hydraulic feed lines.
Also something can be wrong in the MCV valves where to much hydraulic oil flow is going to the oil cooler.
I would get some clear plastic tubing that will fit over the brake bleeder nipple, put one end in the hydraulic oil filler hole on top the 3pt housing and the other end over the brake bleeder nipple, run the engine about 1200-1500 RPM with hydraulic oil warm, open brake bleeder screw and she how much hydraulic oil flows through the tubing, repeat for the other brake. There should only be a trickle of oil flowing.

 

[Kevin Field]

I purchased a 1972 International 454 diesel with a loader about 2 1/2 years ago. All was fine for the first year, then it started to lose power on grade, even when in first gear. Lots of black smoke and little power. I read many forums on the matter in order to try to diagnose the problem and have tried all the suggestions, without success. I changed the fuel lines and tank, changed the filters and checked the injectors. I noticed while driving it one day that when going down a grade, as I pushed the clutch pedal in, the tractor stopped moving. I jacked up the rear and found that the back tires barely turned by hand. When in gear with the rear raised, the brakes and parking brake both worked fine. I came to the conclusion that the lack of power is because something is preventing the rear from turning easily and causing a load on the engine. The rear is full of clean gear oil. Does anyone have any ideas or is familiar with this issue?

I solved the problem. The differential was overfilled by about three gallons, drained and refilled to proper level and now runs fine with power as before. Can anyone explain why too much gear oil would do that? Thank you to all that sent suggestions.

 

[used red MN]

I solved the problem. The differential was overfilled by about three gallons, drained and refilled to proper level and now runs fine with power as before. Can anyone explain why too much gear oil would do that? Thank you to all that sent suggestions.

I have absolutely no idea how this could correlate to a low power problem or drive train drag. One “far out” idea I have is to check the transmission vent wherever that may be. My thinking is some way as it warms up pressure is increasing in the rear case somehow holding pressure in the brake lines and against the brake discs.

 

[JimB2]

I solved the problem. The differential was overfilled by about three gallons, drained and refilled to proper level and now runs fine with power as before. Can anyone explain why too much gear oil would do that? Thank you to all that sent suggestions.

I hope you meant hydraulic oil NOT GEAR oil? We regularly overfill the trans/diff with hydraulic oil on those models of tractors especially if they have a FEL attached.

 

[RedMVa]

I have absolutely no idea how this could correlate to a low power problem or drive train drag. One “far out” idea I have is to check the transmission vent wherever that may be. My thinking is some way as it warms up pressure is increasing in the rear case somehow holding pressure in the brake lines and against the brake discs.

It couldn’t even if vent was clogged, brakes wouldn’t be affected. I’ve seen clogged rear end vents on Kubota’s blow the axle seals out tho

 

[RedMVa]

I hope you meant hydraulic oil NOT GEAR oil? We regularly overfill the trans/diff with hydraulic oil on those models of tractors especially if they have a FEL attached.

Yeah I run 5 gallons over in both of mine, never been a problem, it’s pretty much the standard. Overfilling helps a little with the high heat the trans and rear end generates too.

 

[used red MN]

It couldn’t even if vent was clogged, brakes wouldn’t be affected. I’ve seen clogged rear end vents on Kubota’s blow the axle seals out tho

It was a long shot idea, so you know where the rear end vent actually is? I was just thinking that since the brake lines run outside of the rear axle that the pressure might built somehow pushing the fluid back towards the brakes. I was thinking more about the design that has a little external reservoir that has the stand pipe in it. In the case of the plugged vent the fluid would push away entering the rear axle instead of towards it, so maybe my idea is proven flawed by that. It’s kind of like the scientific method. Create a hypothesis and then prove if it is correct or incorrect.
I would like to know what ambient temperature range this happened in and how long he was operating the machine.

 

[RedMVa]

It was a long shot idea, so you know where the rear end vent actually is? I was just thinking that since the bake lines run outside of the rear axle that the pressure might built somehow pushing the fluid back towards the brakes. I was thinking more about the design that has a little external reservoir that has the stand pipe in it. In the case of the plugged vent the fluid would push away entering the rear axle instead of towards it. It’s kind of like the scientific method. Create a hypothesis and then prove if it is correct or incorrect.
I would like to know what ambient temperature range this happened in and how long he was operating the machine.

No the brake reservoir is for the most part a closed system, the supply just keeps fluid to the masters and the rest just dumps into the trans. The rear end vent is behind the seat on top of the rear end

 

[RedMVa]

No the brake reservoir is for the most part a closed system, the supply just keeps fluid to the masters and the rest just dumps into the trans. The rear end vent is behind the seat on top of the rear end

And the only way the brakes can get too much pressure except for the pedals is if the orifice is not in the supply hose, then you’ll get brake drag.
Did a 385 today where the orifice was completely stopped up, so no supply to the brakes and couldn’t bleed them till I took the hose off, got the orifice out and cleaned it. Those little 1 inch long pieces of plastic with a pinhole in them are not cheap.

 

[JimB2]

The 54/74/84 Series used to run about 6-10 PSI in the trans/diff and there was a sensor under the seat like an engine oil pressure sensor and a light on the dash that would come on when the trans/diff pressure was low. On my brother's 684, one fall when I was chopping corn the light came on solid and I stopped the tractor immediately and checked trans/diff oil level, good, PS, PTO, 3pt all working properly. When my brother came to the field with the empty forage wagon with the 454, we swapped the sensors between 454 and 684 and now 454 had trans/diff light on.
I believe that on 85 series and I know 95 and 32XX series the sensor was replaced with a mushroom looking breather under the seat on top of trans/diff cover.

Since it is a 454 I would tend to think the problem was in the foot brake hydraulic system as according to an old IH mechanic MJ in theUK (Last seen Oct 23, 2025) that used to post on here regularly, that is the reason for the screens and restrictors in the hydraulic lines to the brake master cylinders. Early 54/74 series tractors did not have the restrictors and there was a problem with the brakes not fully releasing and dragging.

 

[RedMVa]

The 54/74/84 Series used to run about 6-10 PSI in the trans/diff and there was a sensor under the seat like an engine oil pressure sensor and a light on the dash that would come on when the trans/diff pressure was low. On my brother's 684, one fall when I was chopping corn the light came on solid and I stopped the tractor immediately and checked trans/diff oil level, good, PS, PTO, 3pt all working properly. When my brother came to the field with the empty forage wagon with the 454, we swapped the sensors between 454 and 684 and now 454 had trans/diff light on.
I believe that on 85 series and I know 95 and 32XX series the sensor was replaced with a mushroom looking breather under the seat on top of trans/diff cover.

Since it is a 454 I would tend to think the problem was in the foot brake hydraulic system as according to an old IH mechanic MJ in theUK (Last seen Oct 23, 2025) that used to post on here regularly, that is the reason for the screens and restrictors in the hydraulic lines to the brake master cylinders. Early 54/74 series tractors did not have the restrictors and there was a problem with the brakes not fully releasing and dragging.

Was your 454 and 684 North American tractors? The 574 I have (which was a demonstrator) has the pressure sensor on top of the trans and the breather under the seat just like the 85 series.

 

[JimB2]

Here in Canada we always received the IH tractors built in Bradford and Doncaster directly from the UK. There were some differences from the European version like the head lights at the top of the grill.
Now that you jog my 77 year old memory the 54/74/84 does have the mushroom looking breather under the seat. It has been a while since we have had the seat and deck plate off the 454, 474 or 684. Just the 495, 3 years ago left outer axle bearing, and the 3230, 2 years ago all brake
O-rings.

 

[RedMVa]

Here in Canada we always received the IH tractors built in Bradford and Doncaster directly from the UK. There were some differences from the European version like the head lights at the top of the grill.
Now that you jog my 77 year old memory the 54/74/84 does have the mushroom looking breather under the seat. It has been a while since we have had the seat and deck plate off the 454, 474 or 684. Just the 495, 3 years ago left outer axle bearing, and the 3230, 2 years ago all brake
O-rings.

Ah a 474, I had never seen one till a year ago at an auction. I had to do orings on my 585 last year, the masters the year before and a clutch in between

 

[Kevin Field]

I drove it after fluid change to see if it had power to go up the inclines it failed on before and all was fine. Very little smoke and no stopping to rebuild rpm's. Did not raise rear to check if it turns easier by hand yet but can say it has a solid plug in top of the rear with no sign of a vent. I will be putting one in. Bigger problem now, the rear wheel split as I was testing, have one ordered, can't wait for the fun of changing it.

 

[JimB2]

Ah a 474, I had never seen one till a year ago at an auction. I had to do orings on my 585 last year, the masters the year before and a clutch in between

Yes, 474 with D-206 German is rare in North America as it was only made for a couple years then replaced by the 475 with the Perkins engine which is even rarer in North America. 474 is the earlier version of 584, 585, 595 and 3230. Most farmers in my area bought 574s then turned the fuel up to be the same power as a 674.
My brother uses the 474 on a 9ft haybine and sometimes on the square baler and in the winter we use in the wood lot with a skidding winch on it.
I like it in the wood lot as it has better ground clearance than the 454 or 495 and is more manurable than the 684.