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: http://www.m-and-d.com/Hydro-Gear_parts.html
Hydrostatic Transmission Fluid is actually 10W-50 synthetic motor oil (like mobil). 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 definitely 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, a lie. All of the JD hydros, and most all others, are serviceable. A complete line of rebuild/replacement parts 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). 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. You have to remove the tranny from the mower (not a difficult things to do, takes about 30 min). Pull that black plug (I used a flat screwdriver 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. 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.
Verify the oil level is correct in the hydrostatic transaxle. Alternately the oil may need to be replaced.
http://www.tufftorq.com/products/lawn-garden/transaxles/index.html
SOURCE: i have a 2005 husqvarna lawn tractor. 24 hp, 48 in
sorry. I don't have an ansewer for you however I might have some helpful hints. Your mower should be going dam near 5 MPH. But yes can't cut in reverse. you have a belt going from the trans axle to the motor. It could be slapping against the frame. The idler puller or the tension pulley could be wobaly where the bearings are gone out. If you remove the 4 bolts on the back of the mower under the seat and gas tank it should visable tell you the story. My question is mine hits gears real hard as if trans mission needs oil or internal damage.
SOURCE: my ride on tractor ( husqvarna yth 1848 xp) blew a
follow the wire from the fuse and you should be able to find the short. if not start unplugging lights and all safety switches and i am sure you will find it.
SOURCE: My Husqvarna Hydrostatic transmission is not
Try this - remove all the transmission oil from the transaxle and put in a heavyer oil - 50 wt.
see if your transaxle has a drain plug - if not you will need to remove the tranaxle from the lawn tractor. I had to try a ratchet strap to the rear of the tractor and lift it up until the wheels were free. I removed the brake linkage spring, the fwd/rev linkage, and wheels. Undo the axle bolts and two screws ofn the cross support bracket on the tranaxle mount. pull the vent fill plug on top of the transaxle and turn the transaxle upside down to drain all the oil from it into a pan. Refill with 50 wt. to the top and remount the transaxle back in place. Next you will need to bleed the system as follows:
1. Have the tractor on jack stands with rear wheel off the floor.
2. Start engine on low speed.
3. repeat open and closeing the bypass valve while alternating the forward and reverse pedals.
4. when wheels start to turn increase the engine speed.
5. repeat quick forward or reverse with panic braking stops until transaxle gets full responce.
6. remove jack stands and have tractor on the wheels.
7. recheck the oil level again.
I did this to mine and it will improve your tractor ability to climb hills like new. 30 wt oil is too light (good for brake in) when tractor was new and refilling it with 50 wt will work like new or better.
SOURCE: Concerning Husqvarna LR120 lawn tractor. Gears will not engae.
Recheck your installation. It sounds like you perhaps got the belt on the wrong side of one or more belt guides. If you need an owners manual, post your full model and serial number and I will see if I can locate one for you
SOURCE: My Husqvarna YTH 2348 mower looses power after it
First try this.. I had the same problem as you with the same mower..After checking around for a day or two most of the answers were low on fluid. I had the small hole and couldn't check it without tearing things out of the way.. To much trouble.. Here is what I found.. The linkage going to my hydrostatic Xmiss. was bound up pretty bad from me cutting grass while it was still damp. It took two years but it happened.. Get a can of BLASTER from tour auto parts dealer.. Let me know.. Bob Greene
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