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Discussion in 'Lawn Mowing' started by burnandreturn, Jan 1, 2004.
Why do lawn mowers use motor oil instead of hydraulic fluid in the hydraulic systems?
All the mowers I have use a synthetic motor oil. Mobil One to be exact.
I don't know why. But I have 3 mowers with hydros and only one has ever had the slightest problem. That was fixed under warranty and I havent had a problem since. Seems as if the motor oil does the job.
Yes they do.
My Toro 36" hydo requires Mobilfluid 424 hydraulic fluid. The newer-style units use Mobil-1 motor oil though.
Many hydro w/b and ztr's require motor oil. Some do use hydro fluid. 20w50 seems to be used a lot. eXmark uses Mobil 1 15w50.
They use whatever fluid the engineers say is best. The World Class T-5 5 speed tranny in my Mustang uses automatic transmission fluid.
Manufacturers might have thought finding hydraulic fluid by the quart could be difficult for some customers. So they engineered them to operate on motor oil.
I understand there is enough difference they're not interchangeable and that you can't mix them.
I had a 400 series Hustler with a 72" deck that took 10w30 motor oil. My Howard Price HP 180 with a 15' cut used Type F transmission fluid. Now my Toro 580-D takes hydraulic fluid.
I'd considered using synthetic in it, but it takes 40 gallons of fluid.
I still have a couple of gallons of the type F transmission fluid that I have no use for. I've been using it in oil cans for hinges and stuff. Guess I have a "lifetime" supply.
For a moment I thought I would easily recommend the advantage of AMSOIL's Synthetic Tractor Hydraulic/Transmission Fluid or their Synthetic Anti-War Hydraulic Oil. Both have service intervals of 2-3 times normal oils. However, in checking the prices for a 55 gallon drum I realize the "leap of faith" it would take to consider this.
You might check out these sites for more information.