P 12/20
Repair
[3]DISASSEMBLY/ASSEMBLY
[3]-5. Air Motor Section
ASSEMBLING
4)Assemble Air motor section to Housing as illustrated in Figs. 22, 23.
Fig. 22
Driver bit
Hole A: insertion hole for Driver bit
Carrier complete
Internal gear 44 
Ribs A: with larger intervening width
1R273
[Top view]
Carrier complete
Hole A
Ribs A
1.First, for easy assembling, make the following adjustment:
Insert Driver bit into Hole A of Carrier complete. Then, by turning Driver bit, set Hole A vertical (or horizontal) to Ribs A of Internal gear 44.
Note: Ribs A cannot be seen when assembling Air motor section to Housing although alignment of Ribs A with Rib B (See Fig.23) of Housing is required.
This adjustment will be able to know the position of Ribs A from that of Hole A.
Fig. 23
2.Hold Housing over Air motor section on 1R273.
In order to fit Rib B (located on Grip side inside Housing) in Ribs A, while watching Hole A through Hole B of Housing, turn Housing or Air motor section so that Hole A is positioned vertical (or horizontal) to Grip.
Put Housing down over Air motor section until it stops.
3.Make sure that Air motor section is properly assembled to Housing by measuring the depth indicated in the illustration below.
The depth will be approximately 43.5mm if properly assembled.
Rib B: located on the inside surface
of Housing end, positioned on Grip side, widest of the four
Housing
Grip
Hole B:
Hole for Driver bit on the end surface of Housing
Hole A
Ribs A
Upper drum cap
Housing
Upper drum cap
approx.
43.5mm
1R273