Increase Top Speed On Your Gravely ZTHD Zero Turn

Is your zero turn mower slower than advertised? This little trick will help you increase the speed on your Gravely ZTHD or other zero turn mowers, and help you make sure it's going straight when you're going full speed.

[@TorqueWagon]

I learned about this adjustment from a viewer, but it’s in the owner’s manual too. What other tricks do you have for mower maintenance and adjustment before your first mow?

[@krflyguy2117]

Would be nice to have you tell us what was the final rotations you found to be the best on yours as a guide.

[@salhrtman6822]

Thanks for the info very helpful didn't Know I could adjust the speed, just purchased a 2021 52 ZTHD last weekend and used it yesterday for the first Time I did feel I was mowing kinda slow compared to my other zero turns

[@angelcintron2122]

I really enjoyed watching this video on how to make the adjustments on the Mower, as it was very informative and educational. One other thing that I've come across in doing so, is that the filters can sometimes become clogged and restrict allowing the free flow of fluid to the transmissions. . I also measure the space between the throw levers to make sure they're both adjusted to the same distance. Sometimes, I put a little piece of tape around the bottom of the bolt, to remind me of where it had been adjusted at the factory. But All in all, this was as "Text Book" as anybody can get it. Can you please make a video on replacing the drive belt on the Gravely 60 inch series, Mowers. Thank you, and Please keep the videos coming. Take care, and
stay safe Sir.

[@kevinspahr6632]

It would be much better if you used an Allen wrench and an open end wrench😁

[@matthmanning]

Thank you for the video. It looked like you were by adjusting that bolt back and forth several different ways and I couldn't really tell what you did. I heard you described it that the bolt being loosened increases the throw of the arms and increases speed.

[@precisioncutsandtrimslawns6645]

I really appreciate that, I have the same exact mower

[@shawncox485]

This is awesome. Thank you so much!!

[@salvadorarreola4729]

mine is a 2020 zt hd 52 but since I remove the screws, the tractor still mowing at 5 to 6 MPH

[@vityaak6898]

is there a way to adjust reverse speed? mine doesn't go in reverse straight

[@scottnunya2441]

If you do adjust them, I recommend finding the same starting point (backed all the way out or screwed all the way in) then counting turns, or removing completely, counting threads, and marking the same point. You'll likely need to fine tune them after the first adjustment. For owners of other type Gravely's, you may find this adjustment bolt is horizontal to the bars, facing directly forward in the open, and much easier to access. I have a Pro 160 and the adjustment bolts arrived with them nearly bottomed out already, and it moves pretty quick so no need for me to mess with them.

[@scotthildebrand1904]

What oil weight do you use? And Brand name

[@lissettelopez8331]

For this mower it’s 2qt 10w30 synthetic.

[@robertgraydon4195]

What state do you live in? Looks like a nice area.

[@TorqueWagon]

Thanks. I live in Southern Indiana. It is especially nice in the fall, and the winters aren’t bad either.

[@robertgraydon4195]

@@TorqueWagon Nice! I've never seen that part of the country but I have a couple friends who are from Indiana. I'm in Central Oregon. Lot of rocks. Rough on mowers.

[@rickyrobinson4573]

What's your final setting 3 full turns?

[@SunriseCrawlers]

Another thing you could look into is putting a thicker fluid in the pumps. They are hydraulic motors so in theory a thicker fluid would cause less loss

[@thebertusmcth]

Why not just pull the bolt completely off to get full range of motion?

[@TorqueWagon]

I may have to try that. The way my luck goes, the thing wouldn’t track straight with the bolts completely out of both sides.

[@thebertusmcth]

@TorqueWagon if it tracks to one side slightly just put the bolt back in on the opposite side its tracking to. And just barrrreeeelllyyyy limit the range of motion on that arm. Voila. Should go straight. But atleast then you would know you are getting full speed out of it.

[@TorqueWagon]

Good point. I think the tire pressure can have some effect on the tracking as well, so it’s important to make sure the tires equal pressure.

[@paisteplayer1040]

My Gravely pro turn 60 does 8-9mph...

[@greggreen6636]

Top speed supposed be 8 anyway

[@N-1951]

All that just adjusts the steering lever position to keep them even. It doesn’t increase the speed.