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Kubota BX24, BX25, BX25D - LA240 loader

Dismounting LA240 front loader from Kubota BX24, BX25, BX25D tractor

When dismounting the LA240 loader, park the Kubota BX24, BX25, BX25D tractor on flat and hard ground, apply the parking brake. When starting the engine or using the hydraulic control valve, always sit on the operator's seat. Side Frame - Raise the boom until the stands can be rotated. Stop the engine. Remove the spring pin holding the stand to the boom. Slide the stands leftward and rotate it until the hole in the stand and pin on the boom are aligned. Then slide the stand rightward and insert the spring pin. Start the engine and run at idle. Dump the bucket approximately 20 degrees. Lower the boom and raise the front wheels slightly. Lift the front wheels with the bucket.

Do not attempt to lift the with the stand. Stop the engine. Remove the mounting pins from the loader side frames and hold them in the plate of side frame. Start the engine and run at idle. Slowly move the hydraulic control lever to rollback position to raise the loader side frames up and out of the receives of the main frames. Stop the engine. Slowly release all hydraulic pressure by moving the hydraulic control lever in all directions. Disconnect the four hoses with quick couplers at the control valve and place them on the right side of the boom. Place the protective caps and plugs on the quick coupler ends. Start the engine and slowly back the tractor away from the loader.

Mounting LA240 front loader to Kubota BX24, BX25, BX25D tractor

Side Frame and Hoses - Slowly drive the Kubota BX24, BX25, BX25D tractor between the LA240 loader side frames until the rear portion of both side frames touches the main frames. Stop the engine. Connect four hoses with couplers to the nipple on the control valve as indicated with color marks. Then connect the protective caps and plugs to each other. Start the engine and run at idle. Slowly move the loader control lever to dump position to lower the side frames into the main frames and engage the bosses of the main frames to the guide bosses of the side frames. Then lift the front wheels slightly with the loader. Stop the engine. Reinstall the mounting pins and secure them with the locking rods. Start the engine. Raise the boom until the stand can be rotated. Stop the engine. Store the stand to their original positions and secure it with the spring pin. Start the engine. Lower the boom and level the bucket.

Kubota BX24, BX25, BX25D - Control Valve

Remove the loader frame. Disconnect the cruise control rod. Disconnect the frame loader control rods. Remove the brake spring. Remove the arms from spool end. Remove the stay bolt. Remove the valve stay. Disconnect the pipes. Remove the control valve with pipes. Disassembling Control Valve - Remove the plugs and take out the spring and load check valve. Remove the seal plates with other parts inside plug. Draw out the spools with other component parts from the valve body. When reassembling - Clean all parts with a suitable solvent, and dry with a lint-free cloth or air. Visually inspect all parts for damage, Install the spools to the valve body, not to damage the O-ring.

LA240 loader - Bucket, Boom and Hydraulic Cylinders

LA240 Loader Bucket and Bucket Cylinder (Kubota BX24, BX25, BX25D)

Remove the pins, the lower pin and remove the bucket. Disconnect the hydraulic hoses from the bucket cylinder. Remove the upper pin and remove the bucket cylinder. When installing the bucket cylinder, the hydraulic port should face inside and be careful of the direction of grease fittings. Boom Cylinder and Hydraulic Tubes - Disconnect the hydraulic hoses from the boom cylinders. Remove the pins and remove the boom cylinders. Disconnect the hydraulic hoses with quick couplers at the control valve. Remove the pins and remove the boom from the side frame. Remove the hydraulic tubes from the boom. When installing the boom cylinders, the hydraulic port should face inside and be careful of the direction of grease fittings.

Piston Rod Assembly

Drain hydraulic oil from the cylinder, and secure the tube end of the cylinder in a vise. Unscrew the cylinder head with the adjustable gland nut wrench. Pull out the piston rod assembly from the cylinder tube. When reassembling - Visually inspect the cylinder tube for signs of scoring or damage. Insert the piston rod assembly to the cylinder tube, not to damage the piston seal on the piston. Install the cylinder head to the cylinder tube, not to damage the ring on the cylinder head.

Cylinder Head, Piston and Nut

Secure the rod end in a vise. Unscrew the nut and remove the piston and cylinder head from the piston rod. Visually inspect all parts for signs of scoring or damage. Insert the piston rod to the cylinder head. not to damage the wiper seal and oil seal. Boom cylinder piston mounting nut - 150 to180 Nm 15.3 / 111 to 132 ft-Ibs. Bucket cylinder piston mounting nut (Kubota BX24, BX25, BX25D) - 350 to 400 Nm / 259 to 295 ft-Ibs.

Installing O-ring and Piston Seal

Place the slide jig on the piston. Install the O-ring to the piston using the slide jig. Install the piston seal over the O-ring using the slide jig. Compress the piston seal to the correct size by installing the piston into the correcting jig. Cylinder Specifications - Boom Cylinder: Cylinder I.D - 40 mm (1.57 in.), Rod O.D - 25 mm (0.98 in.), Stroke - 65 mm (2.56 in.). Bucket Cylinder: Cylinder I.D - 65 mm (2.56 in.), Rod O.D - 30 mm (1.18 in.), Stroke - 204 mm (8.03 in.).

Kubota LA240 front loader troubleshooting

Boom does not rise: Control valve is damaged - Repair or replace control valve. Boom cylinder is damaged - Repair or replace boom cylinder. Control lever linkage is damaged - Repair or replace control lever linkage. Hydraulic pump is damaged - Repair or replace hydraulic pump. Relief valve spring is damaged - Replace relief valve spring. Relief valve is dirty - Clean relief valve. Oil filter is clogged - Clean or replace oil filter. Hydraulic hose is damaged - Replace hydraulic hose.

Boom does not lower: Control valve is damaged - Repair or replace control valve. Control lever linkage is damaged - Repair or replace control lever linkage.

Boom speed is insufficient: Boom cylinder tube is worn or damaged - Replace boom cylinder tube. Boom cylinder piston ring (piston seal and O-ring) is worn or damaged - Replace boom cylinder piston ring (piston seal and O-ring). Oil leaks from tube joints - Repair tube joints. Relief valve setting pressure is too low - Adjust relief valve. Transmission fluid is insufficient - Fill transmission fluid. Relief valve is dirty - Clean relief valve.

Bucket does not move: Control valve is damaged - Repair or replace control valve. Bucket cylinder is damaged - Repair or replace bucket cylinder. Control lever linkage is damaged - Repair or replace control lever linkage. Hydraulic pump is damaged - Repair or replace hydraulic pump. Oil filter is clogged - Clean or replace oil filter. Relief valve spring is damaged - Replace relief valve spring. Hydraulic hose is damaged - Replace hydraulic hose. Relief valve is dirty - Clean relief valve.

Kubota LA240 Front end loader falls by its weight: Boom cylinder tube is worn or damaged - Replace boom cylinder tube. Boom cylinder piston ring (piston seal and O-ring) is worn or damaged - Replace boom cylinder piston ring (piston seal and O-ring). Oil leaks from tube joints - Repair tube joints. Control valve is damaged - Repair or replace control valve.

3rd function valve does not operate correctly: 3rd function valve wiring harness is damaged - Repair or replace 3rd function valve wiring harness. Battery voltage is not supplied to front hydraulic valve main switch - Check battery supply voltage at front hydraulic valve main switch connector. Replace wiring harness. Relay is damaged - Check or replace relay.