Starter carbon brush holder 23378-EN20A 69-8118,69-8118-1,137121，698117 333647，232012，PAPA811 211423106,211453104,211453105.211463104 211473105，771401，8970441320 for Hitachi PMGR

The installation method for the Hitachi PMGR starter motor carbon brush holder is as follows: •  Preparation work: Ensure the vehicle is turned off and disconnect the negative terminal of the battery to prevent dangers such as electric shock or short circuit during operation. Prepare appropriate tools such as screwdrivers and wrenches.  •  Removing the starter motor: Open the engine compartment cover, locate the starter motor, use a wrench to loosen the fixing bolts on the starter motor, unplug the wire connectors on the starter motor, and carefully remove the starter motor from the engine.Disassemble the starter: Use a screwdriver to remove the starter's housing. Some starters may require removing some protective covers first. After opening the housing, locate the brush holder, which is generally fixed by screws or clips. Use appropriate tools to remove it.  •  Install the new carbon brushes into the brush holder: Take out the old carbon brushes from the brush holder. Note that carbon brushes with lead wires covered by insulating tubes should be installed in the insulated brush holder; those with bare copper lead wires should be installed in the grounded brush holder. Insert the new carbon brushes into the brush holder, ensuring they can slide freely within it. The carbon brush spring should be pressed in the center of the carbon brush to prevent uneven wear due to unbalanced force. Also, pay attention to the curved surface direction of the carbon brushes. Installing them in the reverse direction will result in a too small contact area, affecting the starter's performance.Installing the carbon brush holder: If there is a special tool for disassembling and assembling the starter carbon brush, you can slide the carbon brush holder onto the special tool along the tapered surface, making the bottom plane of the carbon brush holder parallel to the bottom plane of the disassembly tool. Then, fit the special tool over the top of the rotor shaft, push the carbon brush holder in the direction of the commutator until it reaches the bottom, and the installation of the carbon brush holder is completed. If there is no special tool, carefully align the carbon brush holder with the installation position, ensure that the carbon brushes are correctly aligned with the commutator, and then fix the carbon brush holder to the starter with screws or clips.  •  Assembling the starter: Install the starter's housing, protective cover and other components in sequence in the reverse order of disassembly, ensuring that all screws and clips are securely installed.Install the starter motor: Install the assembled starter motor back onto the engine, tighten the fixing bolts, connect the wire plug on the starter motor properly, and finally reconnect the negative pole of the battery.  •  Testing: Start the vehicle, check the operation of the starter motor, ensure that the carbon brush holder is installed correctly, the starter motor can run normally, and there are no abnormal noises, smoke, etc.

When installing the Hitachi PMGR starter carbon brush holder, the following precautions should be noted: •  Specification Matching: The specifications of the new carbon brush must be completely consistent with the original carbon brush, including length, width, thickness, and model. Otherwise, it may affect the normal operation of the starter.  •  Safe Operation: Before operation, ensure that the vehicle is turned off and disconnect the negative pole of the battery to prevent dangers such as electric shock or short circuit during operation.Carbon Brush Installation: Carbon brushes with lead wires covered by insulating tubes should be installed in insulated carbon brush holders; those with bare copper lead wires should be installed in grounded carbon brush holders. When inserting the carbon brush into the brush holder, pay attention to the direction of the curved surface. Installing it in the reverse direction will result in a too small contact area, affecting the starter's performance. At the same time, ensure that the carbon brush can slide freely in the brush holder. If there is a jamming phenomenon, grind off the excess part.  •  Spring Installation: The carbon brush spring should be pressed in the center of the carbon brush to prevent uneven force from causing eccentric wear, which would affect the service life of the carbon brush and the working performance of the starter.Contact area: The contact area between the carbon brush and the commutator should not be less than 3/4 of the total contact surface to ensure good electrical conductivity. If the contact area is insufficient, adjustments are required.  •  Cleaning work: During the process of disassembling and assembling the starter, keep the working environment clean to prevent dust, debris, etc. from entering the interior of the starter and affecting its performance. At the same time, ensure that the surfaces of the carbon brushes and commutator are free of oil stains; if there are oil stains, wipe them clean with a clean cloth.  •  Secure installation: The carbon brush holder should be firmly fixed to the starter with screws or clips. When assembling the starter, all screws and clips must be installed securely, and the wire plugs should be connected tightly to prevent poor contact or other faults caused by looseness.

References：The content of this passage is mainly derived from automotive-related professional websites such as Autohome and PCauto, as well as technical documents from some carbon brush manufacturers. Among them, content such as "If the lead wire of the carbon brush is covered with an insulating tube, it should be installed in the insulated carbon brush holder; if the lead wire is a bare copper wire, it should be installed in the grounded carbon brush holder" comes from relevant articles on Autohome. Precautions such as "Before operation, ensure the vehicle is turned off and disconnect the negative pole of the battery to prevent dangers such as electric shock or short circuit during operation" and "The specifications of the new carbon brush must be completely consistent with the original carbon brush" are consistent with the content on Autohome and PCauto. While content such as "The contact area between the carbon brush and the commutator should not be less than 3/4 of the total contact area" is consistent with the technical documentation of Wenli Carbon Products.