How to Repair a Kubota Front-End Loader LA272 for a B7510by Angus MillerUpdated September 26, 2017
The Kubota B7510 tractor series is designed for landscaping and light construction work that requires a horsepower of between 18 and 32. The tractor uses a front-end loader, or bucket, to dig, carry or deposit loose soil, stones or quarry slag. The B7510 series tractor is compatible with the heavy-duty front-end loader designed for the Kubota LA272 series. If the loader develops problems with the hydraulic system or bends, it may malfunction and consequently require repairs.
Check the front-end loader’s hydraulic lines to find out whether they leak or not. The hydraulic lines comprise metal tubing and high-pressure rubber hoses that carry hydraulic fluid to the piston and the pump. Leaking lines prevent the loader from functioning efficiently. For instance, the loader’s arms may not pull out, stretch out or bend.
Tighten the connectors of the leaking hydraulic-line fittings, using your wrench, to ensure they're leak-free. If they still leak, replace them instead of repairing. Tighten the hose clamps of the leaking hoses to check against leaks. Replace them if they still leak.
Position a plastic container under the loader’s oil reservoir and drain the oil -- to enable replacement of the hydraulic lines and hoses.
Loosen the connectors, or the stainless-steel high-pressure fittings, of the leaking hard-annealed steel tubing at the hydraulic-line fitting, using your wrench. Disengage the old steel tubing and set it aside. Replace with the new metal tubing, and tighten the connectors with your wrench.
Identify the leaking rubber hoses and loosen the hose clamp at the hydraulic-line fittings. Disconnect the old hose and replace with a new one.
Loosen the screws that secure the hose barb from the return pressure-hose filter screen situated at the bottom of the loader’s oil-reservoir tank. Unscrew the filter screen to remove it from the oil-reservoir hole.
Check the filter to see whether it has dirt or is damaged. Install a new filter with a hose barb into the reservoir tank to replace it.
Connect the return-pressure hose onto the tank, and tighten the hose clamp.
Remove the oil cap and pour engine oil into the oil-reservoir tank halfway. Replace the cap and start the engine.
Lift the arm of the loader into a raised and extended position, using the bucket controls inside the tractor so that the loader, or bucket, is curled back.
Turn the engine off and unlock the engine cap once again. Fill the oil-reservoir tank to the hydraulic line. Ensure the bucket maintains the curled position, so that the tank is not overfilled.
Start your tractor’s engine once again and test your loader. Check to see whether it still leaks or whether the arms stretch out appropriately.
Bent Front-End Loader
Check the loader to identify the bends, the extent of the damage and the affected regions.
Lower your tractor’s LA272 front-end loader using the bucket controls inside the tractor.
Position a piece of plywood over the loader’s bent area. The size of the piece of plywood should depend on the size of the indentation. For instance, it should be large enough to cover the entire bent area.
Have your helper push the end of your 2-by-4 board against the plywood. The plywood serves as the backstop in this case, to ensure the bend is straightened.
Whack the protrusion of the bend, using your sledgehammer, until it's flattened or straightened.
Items you will need
Replacement hydraulic cylinders
Replacement hydraulic-line hoses