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Здравствуйте, подскажите в чем может быть причина течи переключателя режимов перфоратора Metabo 28 UHE Multi? Как снять его и установить на место?

Repair DC Multi Tools Makita TM3000C [1] NECESSARY REPAIRING TOOLS [2] LUBRICATION Apply grease and lubricant to the portions designated with the black and gray triangles to protect parts and product from unusual abrasion. [3] DISASSEMBLY/ASSEMBLY [3] -1. Armature [1] NECESSARY REPAIRING TOOLS CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”. Code No. Description 1R269 Bearing extractor Removing Ball bearing 629DDW and Sphere bearing 706 1R291 Retaining ring S & R pliers Removing/installing Retaining ring S-7 Use for [2] LUBRICATION DISASSEMBLING (1) No need to remove Carbon brushes completely from Brush holder. After removing Rear cover, simply disconnect Carbon brush from Armature’s commutator. Repair [3] DISASSEMBLY/ASSEMBLY [3] -1. Armature DISASSEMBLING (2) Remove Head covers (L) and ®, then remove four 4x20 Tapping screws. (3) Remove Armature-Crank housing complete assembly from Motor housing,then remove the parts on the drive end of Armature. Repair [3] DISASSEMBLY/ASSEMBLY [3] -1. Armature DISASSEMBLING (4) Remove the parts on the commutator end of Armature. ASSEMBLING (1) Install Insulation washer, Flat washer 7 and Ball bearing 627DDW onto Armature shaft. Then install Wave washer 6 and Magnet sleeve, then secure them with Self lock 6. Important: Wave washer 6 is directional when installed onto Armature shaft. Be sure to install it with the concave side facing Magnet sleeve. If not, Wave washer 6 cannot press Magnet sleeve toward Self lock 6 to set Magnet sleeve in place. Repair [3] DISASSEMBLY/ASSEMBLY [3] -1. Armature ASSEMBLING (2) Mount the component parts to the drive end of Armature by following the steps of procedure described below: 1. Mount Bearing retainer, then assemble Ball bearing 629DDW onto Armature shaft with arbor press. 2. Mount Bearing box to the Ball bearing 629DDW with arbor press. 3. Mount Balancer, Flat washer 7, and Sphere ball bearing 706 onto Armature shaft, then secure them with Retaining ring S-7. (3) Assemble Armature to Crank housing complete. [3] -2. Crank housing complete You must replace Crank housing complete as a unit, because it is a factory-assembled part and cannot be disassembled. Remove Crank housing complete from Motor housing as described in 1 and 2 [3] -3. Switch lever DISASSEMBLING (1) Separate Crank housing complete and Armature from Motor housing. (2) Take out Field from Motor housing. Repair [3] DISASSEMBLY/ASSEMBLY [3] -3. Switch lever DISASSEMBLING (3) Remove Switch knob and Switch lever. Repair [3] DISASSEMBLY/ASSEMBLY [3] -3. Switch lever ASSEMBLING (1) Mount Switch lever and Switch knob on Motor housing. [3] -4. Carbon Brush ASSEMBLING Mount Carbon brushes in place. Circuit diagram Wiring diagram