Makita BPT351 specifications Motor and Gear Section

Repair

P 8/ 15

[3]DISASSEMBLY/ASSEMBLY

[3]-5. Motor and Gear Section

ASSEMBLING

(1)Assemble Cam block section to Spur gear 55 complete. (Fig. 26) Usually, there is no need to disassemble Cam block section for repair.

Note: Put Makita grease N No.2 to the inner and the outer surface of Internal gear 69, the pins of Spur gear 7 complete and the teeth of Spur gear 55 complete.

(2)Mount the following parts on Housing L (Fig. 27);

Spur gear 55 complete, Cam block section, Lock arm section and two Leaf springs

Note: When disassembling Lock arm section, do not remove M3x4 Pan head screw. It becomes easy to set gear section in place.

Regarding two Leaf springs, install them in the space for Internal gear 69 as drawn in Fig. 28.

(3)Face the rim portion of Internal gear 69 oposit side of DC motor and assemble Internal gear section (Fig. 29).

(4)Install Anti back plate to Spur gear 7 complete with the direction described in Fig. 30

and mount them in Housing L. (Fig. 31) Be sure to put Roller portion of Spur gear 55 complete under the hook of Hammer.

Fig. 26	Fig. 27
Cam block section (with Push pin,	Space of Housing L for Lock arm	Cam block
Spring pin 2-8 and Compression spring 2.4	Internal gear 69

	Distance A	Spur gear
	Distance B	55 complete
	Leaf spring
	Center line
Spur gear 55	Leaf spring
complete	Distance A= Distance B	Pin 5

Fig. 28 Fig. 29

Lock arm section	Internal gear 69	Flat washer 12
(with Pin 5 and
M3x4 Pan head
screw )	Leaf spring	Spur gear 27 (3pcs.)
	for Internal
	gear 69	DC motor
	Rim portion
	Spur gear 7
	complete

Fig. 30		Fig. 31
		Hook of Hammer
	Spur gear 7	Roller portion of
		Spur gear 55 complete	Spur gear 55 complete
	complete

Housing L	Internal gear 69		Put Plane bearing 10 on
			Spur gear 55 complete.
	DC Motor		Install Plane bearing 10
Tails of Anti back plate	Anti back plate		into the hook of
		Plane	Spur gear 55 complete.
	Rim portion of
		bearing 10	Hook of Spur gear 55 complete
	Internal gear 69

Caution: If using the tool on condition that Roller portion of Spur gear 55 complete is put on the hook of Hammer by mistake, DC motor runs without transmitting the torque to gear section.