5
Service and Repair Manual
Model
840M
FIG.
PART NO.
DESCRIPTION OF PART NO. REQ.
2
9170 3254 90
Ball Bearing
(2)
5
9170 4650 40
Ball Bearing
(1)
6
9170 4672 80
Vent Kit
(1)
7
9170 3255 20
Needle Bearing
(1)
9
9170 4650 70
M6 Socket Head Cap Screw
(4)
12
9170 4651 00
K35 x 8mm Pan Hd. Plastite Screw
(1)
18
9170 4663 20
Split Sleeve
(2)
20
9170 3258 10
Dowel Pin
(1)
24
9170 3254 60
Slotted Taptite Torx Screw
(2)
25
9170 4652 20
K50 x 22mm PT-DG Screw
(4)
36
9170 4653 30
SDS-Max Nose Service Assembly
(1)
37
9170 4654 60
Crankcase Assembly
(1)
38
9170 4671 70
Gearcase Service Kit
(1)
39
9170 4652 80
Crankshaft Assembly
(1)
43
9170 4655 10
5/8 Cap Plug
(2)
44
9170 4655 20
Screw Cap
(1)
48
9170 4666 30
Depth Rod Mount Assembly
(1)
49
9170 3258 00
Side Handle Housing
(1)
54
9170 4656 60
Main Shroud
(1)
55
9170 4656 70
Locking Ring
(1)
56
9170 3258 60
Spacer
(1)
57
9170 4666 40
Clutch Gear Assembly
(1)
58
9170 4657 10
Drive Gear
(1)
62
9170 4657 40
Gearcase Seal
(1)
64
9170 3255 50
O-Ring
(2)
65
9170 4657 70
Capseal
(1)
67
9170 4657 90
O-Ring
(1)
68
9170 4658 00
O-Ring
(1)
69
9170 4658 10
O-Ring
(1)
70
9170 4658 20
O-Ring
(1)
71
9170 4658 30
Damping Washer
(1)
72
9170 3257 80
External Retaining Ring
(1)
73
9170 4658 60
Retaining Ring
(1)
74
9170 4658 70
Spindle
(1)
75
9170 4659 00
Shift Spring
(1)
76
9170 4659 10
Compression Spring
(1)
80
9170 3259 30
Key Spring
(1)
81
9170 3258 80
Side Handle Band
(1)
84
9170 3258 50
Chuck Collar
(1)
85
9170 3258 70
Collar
(1)
87
9170 4660 30
Barrel
(1)
88
9170 4666 50
Shift Disk Assembly
(1)
89
9170 4660 50
Spring Flange
(1)
90
9170 3257 70
Side Handle Assembly
(1)
97
9170 3259 10
Keys
(2)
98
9170 4653 10
Shift Knob Assembly
(1)
101 9170 4661 60
Wrist Pin
(1)
102 9170 4661 70
Piston
(1)
103 9170 4661 80
Ram
(1)
104 9170 3259 20
Key Retaining Ring
(1)
105 9170 3258 20
Band Retainer
(1)
106 9170 3258 40
Seal Retaining Ring
(1)
107 9170 4662 20
Shift Ring
(1)
108 9170 3257 60
Depth Gauge Rod
(1)
109 9170 3255 10
Connecting Rod Assembly
(1)
111 9170 3258 30
Dust Seal
(1)
112 9170 4663 10
Felt Seal
(1)
113 Spindle
Seal
(1)
114 9170 4663 30
Retaining Slug
(1)
115 9170 4663 60
SDS-Max Striker
(1)
118 9170 4664 00
Washer
(2)
119 9170 4664 10
Barrel Washer
(2)
121 9170 4664 30
Washer
(1)
124 9170 3257 90
Wave Washer
(1)
125 9170 4672 80
Vent Kit
(1)
%
SEE PAGE 6
FOR ADDITIONAL
SERVICE NOTES
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Press Needle Bearing (7)
in Connecting Rod (109)
so that the same amount
sticks out on both sides
of the Rod.
Press Needle
Bearing (6) into
Crankcase (37)
fl ush with the top
of the crankcase
casting,
as shown.
LUBRICATION NOTES:
(TYPE "S2" GREASE, NO. 9170 4664 70)
Fill Piston (102) with "S2" grease and as-
semble to Connecting Rod (109)
with the Wrist Pin (101). Front surface
of Piston (102) and the Ram (103) is
to be free of grease.
Lubricate the O-Ring (68)
with grease.
Lightly coat the inside of the Barrel (87)
with grease prior to assembly.
Lightly coat the
inside bore of the
Spindle (74) prior to
the insertion of the
Striker (115).
Prior to assembly,
apply a light coat of grease
to the Gearcase Seal (62) and
O-Rings (63, 64, 67, 68 and 70).