Makita AR410HR dimensions Removing Spring pin 2.5-5 from Drum, Round end, Rotor shaft

P 10/20

Repair

[3]DISASSEMBLY/ASSEMBLY

[3]-5. Air Motor Section

DISASSEMBLING

6)Spring pin 2.5-5 and Ball bearing 689ZZ can be removed as described in Fig. 18.

Fig. 18

Separate Lower drum cap	Removing Spring pin 2.5-5 from Drum
from Drum.
		Clamp Spring pin 2.5-5 in vise, then pull up Drum while swiveling it
Drum		left and right. The other pin on the opposite side can be removed the same way.

Spring pin 2.5-5

Spring pin 2.5-5

Lower drum cap

Removing Ball bearing 689ZZ from Lower drum cap

Remove O ring 9 from Lower drum cap.

Turn Lower drum cap upside down, then pull off Ball bearing 689ZZ using Rotor as illustrated below.

	Hexagonal end
O Ring 9	of Rotor shaft
	Rotor
	Round end
	of Rotor shaft
	Ball bearing
	689 ZZ

Ball bearing 689ZZ

ASSEMBLING

1) Assemble Rotor to Upper drum cap as described in Fig. 19.

Fig. 19

1. After assembling O ring 9 on Upper drum complete,
put Ball bearing 689ZZ in Upper drum cap.
Then, using arbor press and 1R027, press down the Ball bearing
and Upper drum cap altogether on Rotor shaft until they stop.
Note:	3. Rotate Rotor by hand, and check if
Apply the tapered end of 1R027 to the Ball bearing.
Round end of Rotor shaft has to be inserted into the Ball bearing.	Rotor rotates smoothly.

Ball bearing

689 ZZ

Upper drum cap

O Ring 9

2.After assembling Rotor to Upper drum cap, mount five Blade to Rotor.

1R027

Tapered end

Round end of Rotor shaft

Rotor

Blade (5 pcs)

It may be a little bit tight to rotate Rotor. However, this is not a trouble.

The tightness is caused by O ring 9 correctly set in Upper drum cap.