Makita BFS440, BFS450 dimensions Motor Section, Correct Wrong, CorrectWrong, Notch

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Repair

[3]DISASSEMBLY/ASSEMBLY

[3]-5. Motor Section

DISASSEMBLING

1)Remove Housing R (Fig. 4)

2)Disassemble Armature from the machine as illustrated in Figs. 12 and 13.

Fig. 12

P 5/ 7

Fig. 13

 

 

Carbon

 

 

brush

 

 

Torsion

2

1

spring

 

 

Carbon

 

 

brush

1. Move the tail of Torsion spring onto the notch of Brush holder.

2. Then pull off Receptacle from Brush holder, then remove Carbon brush.

ASSEMBLING

1)Insert Armature into Yoke unit as described in Figs. 14 and 15.

2)Assemble Brush holder complete to the commutator end of Armature. (Fig. 12)

Fig. 14

Fig. 15

Brush holder complete

Armature

Yoke unit

Yoke unit is not reversible when assembled to Armature.

Be sure to assemble so that the notch in Yoke unit is positioned on the drive-end of Armature.

If assembled wrong, the Motor section cannot be assembled to Housing L.

[Correct] [Wrong]

Gear

notch

Because Yoke unit is a strong magnet, when assembling Armature to Yoke unit, be sure to hold the commutator portion as illustrated to left. Do not hold the Armature core as illustrated to right

or your fingers will be pinched between Yoke unit and the fan of Armature that is pulled strongly by the magnet force.

[Correct][Wrong]

Your fingers will be pinched and injured.

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Contents Standard equipment SpecificationOptional accessories Lubrication Necessary Repairing ToolsRepair Helical Gear 48, Clutch Section DISASSEMBLY/ASSEMBLYLocater Section Flat washer Correct Wrong Motor SectionCorrectWrong NotchAssembling Brush Holder to Housing L SwitchIrcuit diagram Fig. D-1 Switch Terminal Wiring diagramFlag connector Yoke unit Circuit Brush Holder Complete