Subtopic	Posts		Updated
	Archive through February 14, 2001	4

By joe miller (Jtm) on Unrecorded Date: Edit

I AM IN THE PROCESS OF BUILDING A HYDROSTATIC DRIVE ATV. I USED ARTICULATE STEERING IT ALSO LOWERS THE BACK SO I CAN DRIVE UP ON IT IN MY WHEELCHAIR AND DRIVE FROM MY CHAIR. I USED A EATON-CESSANA HYDROSTATIC PUMP 2.48 CU.IN., 25 HP KOHLER ENGINE, 4 9.6 CU. IN. MOTORS (WHEELS DIRECTLY DRIVEN BY MOTORS), DOUBLE SELECTOR VALVE(FOR SWITCHING 2 TO 4 WHEEL DRIVE), .6 CU. IN. PUMP ON BACK OF HYDROSTATIC PUMP TO SUPPLY OIL FOR STEERING AND LIFT. CHARLYNN STEERING VALVE AND 2"BORE 4"STROKE CYLINDER FOR STEERING. THE COST FOR THIS AND WHEELS, RIMS, HOSE AND FITTINGS WAS $5000.
IT IS RUNNING AND WORKS PRETTY GOOD WITH A FEW PROBLEMS.

THE GOOD THINGS FIRST. PLENTY OF POWER. THE 25HP MOTOR TURNED OUT TO BE OVERKILL. AT AN IDLE I CAN BURN THE TIRES AND THROW STONE EVERYWHERE. ESTIMATED TOP SPEED 20-25 MPH.

THE BAD - TO MUCH POWER (FOR ME BEING IN A CHAIR I GET SPASMS WHEN I TAKE OFF FAST OR HIT A BUMP TO FAST) ALSO THE SPEED IS FASTER THAN I NEED WHEN I DESIGNED IT 25 MPH DIDNT SOUND THAT FAST BUT WHEN I GO THAT FAST WITH NO SUSPENSION I SPASM NOT GOOD SINCE I COULD EASILY LOSE CONTROL. SO NOW IM IN THE PROCESS OF FIGURING THE BEST WAY TO SLOW IT DOWN.

OVERALL IT WORKS GOOD. THE BENEFITS OF THE VARIABLE PISTON PUMP IS AT THE NEUTRAL POSITION THERE IS NO OIL FLOW SO NO LOAD ON MOTOR AND KEEPS OIL COOLER.

By roadwolf on Unrecorded Date: Edit

way to go.... joe miller for buildin yer own rig. lets' see some pictures of your beast.
i have had kin and friends that wheel around in chairs. they were always lookin around for encouragement.......but in this case you have given that ta all of us!!!

p.s. rev it till it melts,.... then hold it there.

By Jim on Unrecorded Date: Edit

How about that John Deere spin steers. Its It could work like a tank and not have wheels. It apeers to be a simple operation. You could run hydro or cvt or if your darring enough a sport bike motor from a honda CBR with trans.

By DaveButler on Unrecorded Date: Edit

Joe -

What is the current state of your project?

By Greg Wass on Unrecorded Date: Edit

Joe - I am in the process of gathering information to, hopefully, build my own 8x8. You seem very knowledgeable about hydraulics, hydraulic pumps and controls. Can you direct me to a person or company who can help me put together all the proper components for a hydrostatic drive 8x8 (type of engine, pump, controls, etc.)? Also where did you get the AATV body? I would like to talk to you if you are willing please add your phone number when you answer. Thanks - Greg

By Greg Wass on Unrecorded Date: Edit

Joe - I am in the process of gathering information to, hopefully, build my own 8x8. You seem very knowledgeable about hydraulics, hydraulic pumps and controls. Can you direct me to a person or company who can help me put together all the proper components for a hydrostatic drive 8x8 (type of engine, pump, controls, etc.)? Also where did you get the AATV body? I would like to talk to you if you are willing please add your phone number when you answer. Thanks - Greg

By Brad on Unrecorded Date: Edit

Joe,

You can slow your hydraulic ATV by changing the motors on the wheels or by destroking your pump or installing a smaller displacement pump.
We are working on handicap accesible ATV's for the market. The company is Trail Tamer ATV and we manufacture the Mud-Puppy 4x4, 6x6,8x8 amphibious vehicle and the 4x2, 4x4, and articulating utility vehicle.
We have been designing and using the hydraulic system for about 9 years now.

Brad

By paul therkildsen on Unrecorded Date: Edit

Iam currently constructing a modified sierra trailboss. I substituted a 16.5 hp liquid cooled kubota diesel powering a sunstrand hydrostatic pump flowing thru a doublespool valve to 2 danfoss hyd motors 1 each side then chained to front 2 sets of wheels. I haven,t tried to run this puppy yet but it,s close i,ll keep u fellas informed.

By jmagish on Unrecorded Date: Edit

Joe and others, regarding too much power, had a similar problem with a fueling system delivering too FAST, we installed a PRESSURE BYPASS around the pump motor so the inlet was connected to the outlet with an adjustable valve body, I AM NO EXPERT, I could be wrong, but it could work without changing anything, secondly you could change the chain ratio by dec. the smaller drive sprockets on each side, or you could use smaller wheels but this is probably not practical or if your engine is not directly connected to the hyd. pump try inc. the belt ratio from engine to hyd pump, or maybe you could try a REDUCER restrictor in the hyd pump line, this could be a valve to test it out, good luck, always wanted to do what youve done, joe in jax fl.