111 9648 20 D0 wiper motor replacement on JCB 3CX and 4CX loaders starts with basic safety and access preparation. Park the machine on firm level ground, lower all attachments, switch off the engine and remove the key. Disconnect the battery negative cable to eliminate any chance of accidental power flow during the process.

Mark the resting position of the arms on the glass with tape so they can return to the correct angle later. Lift the arms away from the glass and remove the retaining nuts that hold them to the drive shafts. Set the arms aside carefully to avoid bending.

Open the cabin panels or cowl covers that hide the drive assembly. These panels usually sit at the base of the front glass or along the upper cabin edge depending on the year of the machine. Keep all fasteners organised so reassembly stays straightforward.

Locate the electrical connector on the old unit and unplug it. Note the orientation of the plug for later reference. Next free the linkage arms from the output shaft. Some models use a simple clip or bolt while others rely on a press fit. Support the linkage so it does not drop once released.

Remove the mounting bolts that secure the housing to the cabin structure. There are typically two or three bolts. Once they are out, the complete assembly can be lifted free. Inspect the mounting surface and clean away any dirt or old sealant. Check the rubber gasket around the shaft opening. Replace it if cracked so water stays outside the cabin.

Position the new unit from Junt against the same mounting holes. Align the shaft with the linkage and slide the housing into place. Install the mounting bolts and tighten them evenly to the torque values listed in the machine handbook. Reconnect the linkage to the shaft and secure it firmly.

Plug the electrical connector back in until it clicks. Refit the cabin panels and tighten their fasteners. Reattach the arms to the shafts using the earlier tape marks for correct parking angle. Reconnect the battery and test the system at low and high speeds. Watch for smooth travel across the glass and proper return to the rest position.

If the arms move slowly or stop midway, recheck the linkage for binding and confirm the electrical connection is solid. Dust and moisture are common causes of early wear on these machines, so apply a light film of suitable grease to the pivot points after installation.

Junt supplies this style of unit with sealed construction suited to construction environments. After the job is complete, wipe the glass clean and run a short cycle to confirm even contact. Regular visual checks of the seals and free arm movement will help the assembly continue working through dusty and wet conditions.

With the new unit in place and tested the machine is ready to return to productive work on site. Keep a simple record of the date and machine hours so future planning stays clear across the fleet. Matching parts that follow the same mounting pattern and voltage can be reviewed at https://www.juntmotor.com/ when the next service interval approaches.