Hitachi DB 3DL Technical Data & Service Manual page 16

(4) Disassembly of the gear unit
(a) Removal of the gear
Take out Washer (A) [28], First Ring Gear [27], Planet Gear (A) Set (3 pcs.) [26], Pinion (B) [25], Slide
Ring Gear [24], Planet Gear (B) Set (3 pcs.) [23] and Pinion (C) [22] one by one. Then remove the two
Needles [17] from the Gear Case [11]. Take out Washer (B) [21], Ring Gear [20], Planet Gear (C) Set
(3 pcs.) [19], Carrier [18], Needle Roller Set (6 pcs.) [16], Lock Ring [15], three Steel Balls D3 [14] and Pin
Set (3 pcs.) [13] one by one.
(b) Removal of Guide Sleeve (A) [5]
Remove the Retaining Ring [2], Washer (D) [3], Guide Spring [4] and Guide Sleeve (A) [5] in order by
following the procedure shown in Figs. 2-1 to 2-4.
1
Washer (D) [3]
Retaining Ring [2]
Hold the body and adjust the gap of the Retaining
Ring [2] to the groove of socket, then insert a small
flat-blade screwdriver into the groove at an angle.
3
Slide the small flat-blade screwdriver under one
side of the gap of the Retaining Ring [2].
Then slowly raise the other side of the retaining ring with the small flat-blade screwdriver until it is free.
Avoid quickly raising the retainer ring or it may fly out forcefully.
(c) Disassembly of the clutch unit
Remove the Clutch Dial [6] after removal of Guide Sleeve (A) [5]. Turn the Nut [7] counterclockwise and
remove it from the Gear Case [11]. Remove the Spring [8] and Washer (D) [9] from the Gear Case [11].
NOTE: Do not remove the Gear Case [11].
Small flat-blade
screwdriver
Socket
Guide Sleeve (A) [5]
Fig. 2-1
Fig. 2-3
2
Press down Washer (D) [3] with the small flat-
blade screwdriver.
4
Slowly raise the retaining ring using the end
face of Guide Sleeve (A) [5] as a fulcrum.
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Fig. 2-2
Fig. 2-4