Question about Husqvarna Lawn Tractor  25 HP 54in Deck Model YTH2454

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Transmission does not run forward or backwards, machine starts and blades turn good but mower does not move

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  • Husqvarna Expert
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For an answer dealing specifically with your machine include this information with your post. Make/Model/Year/Engine Model/Deck Size, and hours on meter if you have one. A short description of the events preceding the beginning of the problem is also helpful.

If this is your mower, Husqvarna Lawn Tractor 25 HP 54in Deck Model YTH2454, it was last manufactured in 2009. The YTH2454 was manufactured in 2007, 2008 and 2009. You don't say how many hours are on the machine. This is likely important.

I assume you know about the transmission unlock lever at the back of the machine. When that lever is pulled out, the fluid in the transmission is cycled through a bypass port and does not power the machine. The same thing happens when you lock down the clutch/brake pedal. Assuming the levers and connections are in good shape and operating as the are intended and assuming you know these two items are in the proper position then we should move on and check the next two items. Belts and pulleys.

Your transmission is driven by a belt going around a pulley on the engine shaft, back through a tension device (which has two smaller pulleys) and then around a pulley on the top of the transmission. This belt and these for pulleys must be in good shape and should be spinning whenever the engine is running. Check the pulley on the transmission and be sure is hasn't stripped out the spines on the shaft. Some times the tension pulleys wear out and freeze up. Sometimes the belts get out of the groove.

If all of this looks like it is working, then the problem is in the transmission. What follows next is my standard Hydraulic Transmission post.

The NOT SERVICEABLE UN-TRUTH.

The Huskvarna YTH150 uses Hydrogear transmission 319-0650, drive model 150071. One place to find parts and diagrams for most Huskvarnas is here: Hydro Gear parts Hydro Gear transmission Parts Diagrams and Serice Repair...

MTDs use Hydrogear trannys also. Go to the site and enter 618-0319 in the search box. It will bring up a selection of MTD transmissions.

Sears Craftsmen mowers also have trannys from Hydro-Gear.

The best lawn tractor Hydrostatic Transmission Fluid is actually 10W-50 synthetic motor oil (like Mobil 1). Do not use hydraulic fluid or transmission fluid.

Hydro static transmissions on most lawn tractors are very similar. Most of them are made by one or two manufacturers. Tuff Torq makes a lot of them, but not the Huskvarnas. They do make all the John Deere lawn tractor hydro drives. The lawn tractor manufacturers (like JD) often say they are sealed and not serviceable. That is flat out, an untruth. All of the JD hydros, the Huskvarnas and most all others, are serviceable. A complete line of rebuild/replacement parts for JD's can be found at Tuff Torq. Info and instructions can be found there. They have a lot of good general info for anyone rebuilding their tranny.

Additionally, I have found that the mower manufacturers fill them (or spec them) with motor oil, 10W-30W. In the service manual, and at the hydro manufacturer, you are told if your tractor is used in extreme or heavy duty situations it's best to drain the oil and replace it with 10W-50 synthetic motor oil (like Mobil 1™). Truth is the tranny should have this oil from the get go. It will give you more power and extend the life of the tranny. The mower manufacturers are all just being cheap. They figure why not, you're the one who has to pay for the early failure. Oh yeah, one other minor detail, the tranny manufacturer also recommends regular oil changes, like every 100 hours.

Virtually all of these trannys have a black drain plug on the top, if they do not have the add on reservoir. You have to remove the tranny from the mower (not a difficult things to do, it takes about 30 min). Pull that black plug (I used a 1" putty knife to pry mine out) and turn the tranny upside down for about 30 min to completely drain. Most hold about 2 quarts. Flip it back, right side up, and refill. Install plug and reinstall tranny. Note: under the plug there is often a magnet which collects metal shavings. Lift this magnet out while you have the plug out; clean it and replace it. It may fall out while the tranny is upside down.If anything else falls out, you have a broken tranny and will have to take it apart.

When you refill the fluid just keep filling till it comes up within a quarter inch of the plug. You may have to go through a bleed process after reinstalling the tranny. The tuff torq site explains the bleed process. https://www.tufftorqservices.com/instance1EnvEELogin/html/login.html
Hydro Gear parts Hydro Gear transmission Parts Diagrams and Serice Repair...

Posted on Mar 28, 2015

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  • Husqvarna Master
  • 2,027 Answers

Do have a broken belt?
If the pulleys turn but the tractor does not move before you go farther see if you have a broken shear pin in one of the pulleys You may have a transmission that needs work. if that doesn't work out.

Posted on Mar 28, 2015

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