Fastening Torque; Maintenance - Makita HR4501C Technical Information

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epair
[3] DISASSEMBLY/ASSEMBLY

[3] -11. Fastening Torque

Fasten the bolts to the fastening torque listed in Fig. 63.
Note: Apply adhesive (ThreeBond 1342 or Loctite 242) to the thread of M4x12 Pan head screw (Item No. 78).
Fig. 63
15 M6x30 Hex socket
head bolt (4 pcs.)
Barrel complete
Crank housing
complete
Gear housing
complete
Motor housing
Fan 90
(Armature Fan)
131 M8-12 Hex nut

[4] Maintenance

When replacing carbon brush, it is recommended to do replace the following parts (Fig. 64) and apply appropriate amount
of lubricants (Figs. 1 to 3) at the same time for longer service life of the machine.
Fig. 64
1. Tool holder cap
22. X Ring 21
23. Fluoride ring 28
24. O Ring 23
39. O Ring 27 on Striker
49. O Ring 27 on Piston
64 M6x30 Hex socket
head bolt (4 pcs.)
Item No.
131
1
on Impact bolt
Crank lever
Crank cap
Retainer plate
78 M4x12 Pan
head screw
Description
15 M6x30 Hex socket head bolt
64
M6x30 Hex socket head bolt
78
M4x12 Pan head screw
M8-12 Hex nut
22 23 24
(Impact bolt)
P 20/ 23
Fastening torque
Q'ty
7.8 - 11.7 N.m
4
4.9 - 7.8 N.m
4
1 1.5 - 2.3 N.m
1.8 - 3.5 N.m
1
49
39
(Striker) (Piston)