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Why is my John Deere LA 150 not pulling hills after 40 minutes of mowing

After I mow for approximately 40 minutes, the mower will mow on level ground but will not pull hills. It has a grinding sound will under stress on a hill. After shutting the mower off for an hour, it will mow again on hills for about 30-40 minutes.

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I have an LA145. I do a bit of commercial mowing with this mower. Sounds like tranny problems developing, if the growling noise is coming from the back under your seat. Tranny problems need immediate attention if you want to save the tranny.

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. 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.

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. John Deere fills them with 10W-30. 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 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 use a flat blade screw driver to pry them up) 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.

The Huskvarna YTH150 uses Hydrogear transmission 319-0650, drive model 150071. One place to find parts and diagrams is here:http://www.m-and-d.com/Hydro-Gear_parts....

Posted on Mar 13, 2015

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It sounds like the ignition coil is heating up and shorting. It can also have icreased resistance in the coil resulting in insufficient spark. Check the spark when it gets hot by inserting Phillips head screwdriver into the plug wire and hold 3/8 to 1/2 inch from engine ground. It should have a blue spark. If it is yellow or weak, the coil is overheating as previously mentioned.

Posted on May 10, 2014

  • Daryl Gleaton Mar 22, 2015

    I missed the grinding sound info on the mower when I read your post. I believe the transaxle is where the problem lies as the other tech. has stated. This would be due to a bad bearing in the axle or ring and pinion bearings. If there leakage at the transaxle it will cause damge to the unit due to insufficient oil level.

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6ya6ya
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wireguy212
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SOURCE: After a couple passes tractor will not climb hill.

To me it sounds like the hydro unit has developed internal leaks and the pressure lowers as the oil thins from heat.These trans axles are usually replaced as an unit but some can actually be repaired.call the dealer to see if you can get parts or whether you need to replace the whole thing.I assume you have already tried a new drive belt,tensioner ect. and if so you are down to the trans axle.You may buy some time buy getting rid of the low viscosity oil in the rear end and go to regular hydraulic oil.

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Looked up detailed isometric diagram w/ parts denoted on John Deere website. FixYa website was a litele misleading. I did not realize that accessing a question posted "for free" would cost me something to get the answer. It's kind of like askin a neighbor as a neighbor to give you a hand and then he sends a bill.
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SOURCE: John Deere riding mower SRX95 - Steering wheel is sticking

You need to replace your Ball Joints! On the front steering rods There are two sometimes three !

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SOURCE: TRACTOR BLEW WHITE SMOKE, AND STARTS TO SPUTTER

Start with making sure your oil lever is not over full. If it is it may be getting into the crankcase breather hose that goes to the carburetor hence the white smoke. Sometimes also you can blow a gasket in the breather system and it will do the same. Check for oil leaks in the breather system. Hope this helps. donnyb60

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bbreton
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SOURCE: need instructions for changing a drive belt on a John Deere LT155

I have googled LT155 and came upon john deere LT155 lawn tractor(noncurrent). It took me to John Deere's site. I put in your model number and it had several catagories. I would try the alphabetical list, go to B and look for traction belt.
Good day.

Posted on Oct 14, 2009

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