Small Engines (Lawn Mowers, etc.)/hydrostat


QUESTION: I have aquired a TroyBilt 13035 riding lawn mower.  Used it for the first time.  Couple of issues:
1.  Blades don't seem to spin fast enough.  Belt looks narrow, could it be belt slippage?  Spindles seem fine.
2.  Most concerning is hydrostat leaks some and also has trouble pulling up a hill.  After mowing for a while it would almost stall out trying to go up a incline and had to backup.  Manual says 20w oil.  We filled reservoir before we started.  Any ideas?

ANSWER: Pulleys will wear as well as belts.  If they are turning, and not slipping when cutting grass, you are probably alright.  Does the belt have a part number on it?  Someone could have changed the engine pulley with a different diameter which could alter the blade speed.

Is there a manufacturer brand name and a model number on the hydro unit?  Hydrogear supplies a lot of transmissions for many mower brands.

If it is leaking, is it a seal?  We see a lot of hydrostat transmissions fail just as you described.

MTD makes Troybilt.  Check You Tube for "hydrostatic mower transmission".  There are lots of videos on the subject.


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QUESTION: The belt looks narrow, likely worn.  Not sure I want to spend the money on a belt if the hydro is shot.
The hydro is a Eaton 650.  Any tips or tricks to try on it?  Some other type of fluid to put in it besides 20w?  Could that belt be slipping or not since I said it would almost stall the engine?  Thanks for any info you can give.  May just have to let the kids ride it around:)

No tips on these hydros.  Since it is so expensive to repair them, due to high labor costs, most customers choose just to buy a new mower by the time they bring their broke mowers to the shop...we basically do no repairs...just replace those transaxles if they are bad and the customer is willing to pay for the replacement.

Did you Google Eaton 650?

Small Engines (Lawn Mowers, etc.)

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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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