Small Engines (Lawn Mowers, etc.)/Allis Chalmers 716H


Doug wrote at 2007-04-01 15:02:18
I have a 716h allis chalmers.  To release the hydrdostat, lift up the seat-rear fenders.  On top of the hydrostat pump, there is a small lever-run mode is in the up position.  Push it down, and it releases the pump.

amg wrote at 2007-04-24 03:59:28
My father had a 716H that he bought new in 75, and used up till a few years ago.  Not sure if the drives changed over the years or not, but when you lift the seat, on top of the hydrostatic drive, there were 2 bolt heads aprox 1-1/4", with 1/4" spring loaded pins in the middle.  If you pushed both pins in at the same time, that would release the pressure.   Hope that helps.

Sticker-55 wrote at 2010-07-16 23:34:25
The hydro release is under the rear cover on top on the left side.It looks like a thin piece of angle iron. All you have to do is push it down till it locks. To release it move the tab sideways.The buttons will pop up when you start the engine.

Frank Foglesong wrote at 2012-10-29 16:52:03
Hi REx: In answer to a question on the free wheeling of the 716 hydro: If you raise the seat lid up, just under on top of the hydro unit you'll find a lever with a spring holding in the up position, depress the lever down on top of 2 release buttons setting on top center of the hydro unit, this will allow the tractor to engage into the free wheel motion, pull lever back up to reengage into a running position. Hope this helps solve the problem, as I still own an original 716 since new and can provide pictures for you if necessary.

Rick wrote at 2013-09-02 18:51:18
if it is a sundstrand hydro the just above the check valves there is a olate that oushes down on the check vales to realease the pressure(check valves look like 1" nuts that have a pin looking plunger on them) Hope this helps  Rick

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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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