Page 1
November 2015 Description 150mm (6") Random Orbit Sander ONCEPT AND MAIN APPLICATIONS BO6050 is a 150mm (6”) Random orbit sander developed as the successor to the current model BO6040. • Excellent operability thanks to the following: - Toolless pad change...
P 2/ 28 epair CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”. Index [1] NECESSARY REPAIRING TOOLS [2] Lubrication [3]-1 Tightening torque for screws [3]-2. Gear housing complete section P 5-13 [3]-3. Armature P 14-16 [3]-4. Top cover section P 17-19 [3]-5.
P 3/ 28 epair [2] LUBRICANT AND ADHESIVE APPLICATION Apply the lubricants as follows. Makita Grease R No.00 to the portions designated with black triangle. Makita Grease FA No.2 to the portions designated with gray triangle LUBRICANT Item No. Description...
Page 6
P 6 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -2. Gear housing complete section DISASSEMBLING Fig. 7 (22) 4. Remove Head cover L (22). Fig. 8 Section (7) 5. Remove Top cover section (7) by unscrewing four 4x16 Tapping screws. Fig. 9 Screwdriver 6.
Page 7
P 7 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -2. Gear housing complete section DISASSEMBLING Fig. 11 (34) (33) 8. Unscrewing three M4x12 Pan head screws (34), remove Balancer (33). Fig. 12 1R004-A 9. Remove Retaining ring S-8 (13) with 1R004-A. (13) Fig.
Page 8
P 8 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -2. Gear housing complete section DISASSEMBLING Do not re-use the parts items designated with this mark, because it is difficult to proceed the repair without giving them damage or deformation. Fig. 14 (28) 12.
Page 9
P 9 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -2. Gear housing complete section DISASSEMBLING Fig. 16 (29) 15. Remove Retaining ring S-30 (26) with 1R291 from Outer spindle 1R291 (26) complete section (29). (26) Fig. 17 (29) 16. Supporting Ball bearing 6906DDW (27) with 1R258, separate the Ball bearing (27) from Outer spindle complete (29) by...
Page 10
P 10 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -2. Gear housing complete section ASSEMBLING Fig. 19 5. Insert Outer spindle complete (29) (29) to Gear housing complete (25). (25) Fig. 20 (34) 6. Tighten three M4x12 Pan head screws (34) to Gear housing complete (25).
Page 11
P 11 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -2. Gear housing complete section ASSEMBLING Fig. 22 9. Pass Inner spindle complete (35) through 1R033. Put Ball bearing 6001DDW (32) to 1R028 Inner spindle (35). Apply 1R028 to Ball bearing 6001DDW (32). (32) Press 1R028 with Arbor press.
Page 12
P 12 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -2. Gear housing complete section ASSEMBLING Fig. 25 12. Support Ball bearing 6001DDW (32) with 1R034. Press Internal gear 34 (12) with Arbor press. 1R027 <Note> Do not press Internal gear 34 (12) too hard after seating.
Page 13
P 13 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -2. Gear housing complete section ASSEMBLING Fig. 28 (35) 15. Assemble the following parts to Inner spindle (35). (36) Cover (39) (37) Flat washer 10 (38) (38) Thrust needle gauge (40) (39) O ring 26 (40) Flange (36) (37)
Page 14
P 14 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -3. Armature DISASSEMBLING 1. Disassemble Gear housing complete section. See Fig. 4 - 9. Fig. 32 (81) (80) 2. Separate Rear cover (80) (81) by unscrewing one 4x18 Tapping screw (81). Fig. 33 3.
Page 15
P 15 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -3. Armature DISASSEMBLING (1) Disassemble Gear housing complete section. See Fig. 4 - 9. Fig. 36 6. Separate Armature (49) from Gear housing cover complete (43) with 1R045. (49) (43) 1R045 7. Remove Flat washer 10 (48) from the drive end of Armature.
Page 16
P 16 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -3. Armature ASSEMBLING Fig. 39 1. Assemble Wave washer 6 (54). (54) Fig. 40 2. Press down Self lock 6 (56) until Wave washer 6 (54) gets flat. Magnet sleeve (55) is stabilized (56) between Self lock 6 (56) and Wave washer 6 (54) by the reaction...
P 17 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -4. Top cover section DISASSEMBLING 1. Disassemble Gear housing complete section in the order of Fig. 3 - 8. Fig. 42 Roto-orbit mode. 2. Remove Compression spring 5 (4) with Slotted screwdriver. <Note>...
Page 18
P 18 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -4. Top cover section DISASSEMBLING Fig. 45 6. Remove Ball bearing 6804LLU (8) from Spur gear 31 (9). 7. Consequently, Top cover section is disassembled as drawn. 1R269 Item Used, Descriptions Q’ty (17) 4x14 Tapping screw Change knob...
Page 19
P 19 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -4. Top cover section ASSEMBLING Fig. 48 Triangle mark 3. Set Guide plate (5) and Change plate (3) to Top cover (7), aligning their holes to Spur gear 31 (9). 4. Set Change knob (2) to Top cover (7), facing its triangle mark to the direction shown in photo. 5.
Page 20
P 20 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -5. Front switch lever, Rear switch lever DISASSEMBLING 1. Disassemble Gear housing complete section in the order of Fig. 3 - 8. 2. Disassemble Armature from Motor housing. See Fig. 32 - 34. Fig.
Page 21
P 21 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -5. Front switch lever, Rear switch lever ASSEMBLING 1. Disassemble Gear housing complete section in the order of Fig. 3 - 8. 2. Disassemble Armature from Motor housing. See Fig. 32 - 34. Fig.
Page 22
P 22 / 28 epair [3] DISASSEMBLY/ASSEMBLY [3] -5. Front switch lever, Rear switch lever ASSEMBLING Fig. 57 (58) (57) (57) 9. Assemble Baffle plate (58) by tightening with two 4x75 Tapping screws (57).
P 23 / 28 ircuit diagram Fig. D-1 Switch knob Dust nozzle Color index of lead wires' sheath Blue Black Brush holder Brush holder (Switch knob side) (Dust nozzle side) Clear Brown White Pick up coil 20 AWG* Field Closed end 22 AWG* 22 AWG* connector...
P 24 / 28 iring diagram Fig. D-2 Wiring of Filed lead wire Route Field lead wires (red), (white) through the Motor housing’s opening of top left side, viewing from Switch knob assemble side. Field lead Field lead Place for Switch wire (red) wire (white) knob assembling...
Page 25
P 25 / 28 iring diagram Fig. D-4 Wiring on Motor housing Wiring equipped with Line filter Dial side Pass Field lead wires (white), (black) through the Line filter’s hole. And put Line filter to the place Fix Field lead wire (black) in these lead wire holders to avoid sagging. illustrated bellow.
Page 26
P 26 / 28 iring diagram Fig. D-5 Wiring on Motor housing Switch Knob side Dial of Controller Switch knob Dial of Controller Put Field magnet lead wire (red) to the inside of this rib. Do not put any Lead wires on this rib.
Page 27
P 27 / 28 iring diagram Fig. D-6 Wiring on Motor housing opposite of Switch knob side Terminal block Lead wire holder A Put Noise suppressor facing Fix Lead wires its lead wire connected portion connected to Terminal to Brush holder side if it is block in Lead wire used.
Page 28
P 28 / 28 iring diagram Fig. D-7 Wiring to Switch Stepped side flat side Connect Insulated terminal to Switch as follows. Switch Insulated terminal * Facing its flat side to Switch * Facing lead wire connected portion to Tumbler side Wire connected portion Tumbler Fig.