Tractor rpms

[Serp0421]

I’ve got an ole l4150 I’ve gone thru and got working properly. If I push the throttle all the way it seems to rev accordingly but my tach it never gets up to the 540 PTO mark. I’m assuming it’s a faulty tachometer. Thoughts?

 

[jimh406]

Possible tach issue although I've never heard of one partially working. I think it's more likely the throttle is out of adjustment either because the bracket is loose or cable has stretched. I'd check the throttle along the entire path.

 

[Serp0421]

Possible tach issue although I've never heard of one partially working. I think it's more likely the throttle is out of adjustment either because the bracket is loose or cable has stretched. I'd check the throttle along the entire path.

After working the throttle back and forth and some lube it was doing a little better. I could get it to about 2150 rpm. The 540 PTO mark is at 2250. I definitely can’t go any past that. The lever on the injector pump or throttle is bottoming out on the adjustment screw that has some kind of tamper tag on it. It’s a small little tag twisted to the adjustment screw with a wire.

 

[jimh406]

It’s a small little tag twisted to the adjustment screw with a wire.

That's really only an issue if your tractor is under warranty. Otherwise, clip it and adjust. Don't go crazy, but going to the 540 mark or slightly over should be fine.

 

[GeoHorn]

When was the last time you checked/cleaned/replaced your fuel filters? Air filters?
According to tractordata.com that engine is rated at 2600 RPM. It ought to be able to achieve that.
I’d look for other possible reasons for underperformance before I broke any seals on pumps to make mechanical adjustments.

 

[Russell King]

I assume it is a mechanical cable drive tachometer..

Replacing the cable would be my guess to fix it.

 

[PoTreeBoy]

When was the last time you checked/cleaned/replaced your fuel filters? Air filters?
According to tractordata.com that engine is rated at 2600 RPM. It ought to be able to achieve that.
I’d look for other possible reasons for underperformance before I broke any seals on pumps to make mechanical adjustments.

I'd check the tach accuracy before breaking the seal. There are strobe tach apps for Android and Apple phones (why do we still call them phones?).

 

[GeoHorn]

I'd check the tach accuracy before breaking the seal. There are strobe tach apps for Android and Apple phones (why do we still call them phones?).

Do you have a recommended app for Androids? Thx.

 

[PoTreeBoy]

Do you have a recommended app for Androids? Thx.

I've never actually used one. I'd just go to the Play Store, search by strobe tach, and look at what's offered. I may do that someday, my max revs per the tach are about 100 below rated.

 

[PoTreeBoy]

Do you have a recommended app for Androids? Thx.

I just installed Strobily - looks like it would work on my Moto G Power 2020.

 

[Serp0421]

When was the last time you checked/cleaned/replaced your fuel filters? Air filters?
According to tractordata.com that engine is rated at 2600 RPM. It ought to be able to achieve that.
I’d look for other possible reasons for underperformance before I broke any seals on pumps to make mechanical adjustments.

I just got this tractor not long ago. I know it sat up for a few years. I don’t know the maintenance history but the engine and trans oil look clean. I plan on changing all the fluids and filters but just haven’t got to it yet.