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I HAVE A CTH140 TWIN LAWN TRACTOR AND WOULD LOVE SOME GUIDANCE ON CHANGING/TOPPING UP OIL IN TRANSAXLE, CANT FIND A FILLER PORT OR EMPTY PORT, ND WHAT OIL SHOULD I USE.

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Need Make/Model/Year/Engine Model/Transmission Model/Deck Size, and hours on meter if you have one.


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

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, 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 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. Tuff Torq Lawn Garden

Posted on Apr 09, 2015

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Posted on Jan 02, 2017

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LEAKING OIL right transaxle


Johnny, Transaxle needs a new seal. you can get or order your seal from any local small engine repair shop. Check the attached links,instruction and guides, Good luck
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Hydrogear transaxels take a multi grade oil 20-50 the filler is a brass plug on the top, there should be a 1/4" air gap at the top to allow for expasion, Tuff Torq units also take a multi grade oil 10-30, these units normally have a resevoir on the top with upper and lower fill marks.

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Hi, I have a Craftsman Garden Tractor 18HP Twin, model mo. 917.255919 that has a transaxle leak. The transaxle takes about 5 quarts of SAE 30 Motor Oil. I took the transaxle apart last summer to fix a gear...


I would drain transaxel out and refill with 80w90 gear oil. I think the 30 w is way to thin. You can try some lucas trasmisson sealer and conditioner and see if that helps.
If you have to remove the transaxel I would use hi-temp silicon sealer to seal all seams and arou
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If it is a hydrostatic transaxle check to see if it is leaking,if it is then there really is no economical repair to transaxle. If it isn't leaking then It sounds like the oil in transaxle is degraded.The transaxle is supposed to be a sealed unit requiring no service but over time the oil will get dirty enough to cause problems like you are describing.Remove the back hitch plate and look at the transaxle it will have a rubber vent hose or a 1/4 Allen wrench fitting on top. You will need to purchase a battery suction bulb from sears automotive and use it to remove as much oil from transaxle as possible. Warm the transaxle up first by running it around,then suction the oil out.Refill with a good synthetic motor oil 15w-50 or 20w-50 like Amsoil or Mobil 1.Do not use transmission fluid or hydraulic fluid. When adding the new oil back fill it to within 1.5 in from the top,be sure to allow this amount of air space in top of transaxle for expansion.

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I have a 42 inch craftmas mower and the fluid is leaking from the hydrastatic area, can I replace it with transmission fluid.


If you transaxle is leaking badly adding oil may not help long term,if you remove the back hitch plate there is a allen wrench plug or a rubber vent hose, you can add oil there,measure down from the top of transaxle and fill to within 1.5 inch of the top,always allow 1.5 in of air space in top to allow for expansion. Add amsoil or mobil 1 synthetic motor oil 15w-50 or 20w-50. Do not use transmission fluid or hydraulic oil.

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1 Answer

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It sounds like the oil in transaxle is degraded.The transaxle is supposed to be a sealed unit requiring no service but over time the oil will get dirty enough to cause problems like you are describing.Remove the back hitch plate and look at the transaxle it will have a rubber vent hose or a 1/4 alllen wrench fitting on top. You will need to purchase a battery suction bulb from sears automotive and use it to remove as much oil from transaxle as possible. Warm the transaxle up first by running it around,then suction the oil out.Refill with a good synthetic motor oil 15w-50 or 20w-50 like Amsoil or Mobil 1.Do not use transmission fluid or hydraulic fluid. When adding the new oil back fill it to within 1.5 in from the top,be sure to allow this amount of air space in top of transaxle for expansion.

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Your Onan engine will do excellent with Mobil One 0w40, Mobile One 5w30.

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Your transaxle requires 10w40 synthetic or conventional oil as well as a wix 51410 filter or the OEM wheelHorse filter. It should be changed every 100 hours with conventional oil or 250 hours with synthetic. DO NOT use hydraulic oil!

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