HITACHI DH 38YE User guide
MODEL DH 38YE
1. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY:
The circled figures in the descriptions below correspond to the item numbers in the Parts List.
1-1. Disassembly:
1-1-1. Piston and Striker O-Rings:
By removing the M6 x 25 Hex Socket Hd. Bolts
Case
Crank Shaft
47
. As the Piston 58 remains in the Crank Case side, removal of the Connecting Rod 60 from the
41
will be sufficient. The Striker 55 can be removed by tapping the Cylinder Case lightly witl
62
, the Cylinder Case 63 may be removed from the Crank
a plastic hammer.
If the Striker cannot be easily removed, reinsert the Piston, together with the Connecting Rod, into the
Cylinder, and pull it out again in a quick motion; the Striker should come out simultaneously.
1-1-2. Disassembly of Cylinder:
Remove the Cylinder Case
63
; and you can then remove the Third Gear 66, Clutch 57, Spring A 18, Cylinder Ring 16, Damper
11
Ring
, Damper 12, and Second Hammer 10.
63
from the Crank Case 47: take the Front Cover 7 off of the Cylinder Case
Next, as illustrated below, fit a drill bit into the tool holder, and secure it with a vise.
Then mount the Second Hammer
[Code No. 970885] on the flat surfaces of the Cylinder Cap
10
and Cylinder 54 onto the drill bit. Finally, fit a Wrench (J-123)
13
, and rotate it counterclockwise to loosen
and remove the Cylinder Cap.
Cylinder
Ball Bearing
Cylinder Cap
Second Hammer
Drill Bit
J-123 Wrench
Vise
After the Cylinder Cap has been removed, press off the Ball Bearing 15 with a hand press. The Cylinder
can then be completely removed.
1-1-3. Disassembly of the Slip Clutch Mechanism:
First, place an appropriate steel plate on the Ball Bearing
30
. Then, as illustrated below mount a bearing
puller (special repair tool J-30 Bearing Puller Ass’y [Code No. 970804] recommended) on the steel plate
and Third Pinion
remove the C-Type Retaining Ring
19
, apply pressure from the Second Gear 23 side to compress the Spring 28, and
32
. After removing the Ball Bearing 30, the remaining parts can be
disassembled.
−
−#
1
D9 C-Type Retaining Ring
32
Steel plate
23
29
28
27
26
25
30
19
24
Metal
Ball Bearing
Washer
Spring
Plate
Holder
Steel Balls
Second Gear
Third Pinion
Bearing Puller
1-2. Reassembly:
Reassembly can be accomplished by following the disassembly procedures in reverse. However, special
attention should be given to the following items.
1-2-1. Lubrication:
60
Special Grease must be applied to the Needle Bearing of Connecting Rod Ass’y
55
the Striker
Grease must be inserted in the Crank Case
and Piston 58, the 6007 Ball Bearing 15, and the O-Ring (C) 9. 50g (0.11 Ibs) of Special
47
(Connecting Rod side), and 20g (0.044 Ibs) of Special Grease
the O-Rings attached to
must be inserted in the Cylinder Case.
52
Ensure that Grease (N. P. C. SEP-3A) (Code No. 930035) is applied to the Needle Bearing
82
portion of the Armature Ass’y
53
Cover
.
, and Oil Seal (A) 46. Insert 40g (0.088 Ibs) of Grease into the Gear
, the piston
1-2-2. Reassembly of the Tool Retainer:
5
Ensure that the notched portions (A) of the Stop Lever
and the Knob 3 are properly aligned and assembled, as shown in the illustration. If not corr ectly aligned and assembled, the bull point cannot be properly inserted into the Tool Holder.
4 5
2
Notch
Notch
1
3
−#2 −
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