Is it possible to add float function to a front end loader that doesn't have it as standard? Is it just a case of changing the spool valve for the loader lift circuit, or is there something else required?
Unless it's more than 30 something years old it's probably a loader valve.
1 stick to run lift and curl.
But replacing the valve for lift is the solution.
You need to know flow required, open vs closed center, and fittings.
What kind of tractor and loader do you have ? Your signature indicates your tractor is UHI ? I have never heard of that brand tractor before.
Ok here is some information about UHI equipment AI Overview Learn more…
UHI tractors are manufactured in Chinaby XCMG, the world's third largest earthmoving equipment manufacturer. Some components of UHI tractors come from other companies, including Kubota diesel engines, Rexroth hydraulic pumps, and Eaton slew and track motors.
UHI tractors are competitively priced and are popular with smaller landscaping contractors, farmers, jobbing builders, and agricultural contractors. Some say that UHI tractors are a good choice for equipment that won't be used too often because they are more affordable than tractors from bigger brands.
Some Fords all you have to do is turn 1 bolt to a different position and down pressure will be turned off so float will start working
Float can be added via externally mounted electrical valves but depending on tractor and loader might be less expensive and easier to replace the loader valve.