3-21
3-21
1.
1.
φ
φ
D
D
502735
502735
IItte
em
m
S
Stta
an
nd
da
arrd
d
L
Liim
miitt
Wear if commutator (
Wear if commutator (
φ
φ
D)
D)
3 W
3 W
1.7 to 1.6 ton model
1.7 to 1.6 ton model
30 mm
30 mm
(1.18 in.)
(1.18 in.)
29 mm
29 mm
(1.14 in.)
(1.14 in.)
1.8 to 2.0 ton model
1.8 to 2.0 ton model
40 mm
40 mm
(1.57 in.)
(1.57 in.)
39 mm
39 mm
(1.54 in.)
(1.54 in.)
4W
4W
40 mm
40 mm
(1.57 in.)
(1.57 in.)
39 mm
39 mm
(1.54 in.)
(1.54 in.)
CHAPTER 3 MOTOR
CHAPTER 3 MOTOR
502736
502736
IItte
em
m
S
Stta
an
nd
da
arrd
d
Under cut of
Under cut of commutator
commutator
0.8 to 0.85 mm
0.8 to 0.85 mm
(0.032 to 0.034 in.)
(0.032 to 0.034 in.)
How to repair of commutator
How to repair of commutator
(1)
(1) Grin
Grind or
d or polish
polish the
the Comm
Commutat
utator.
or.
(2)
(2) Unde
Undercut
rcut the co
the commu
mmutator
tator after
after grin
grinding
ding..
(3)
(3) Finis
Finish the sur
h the surface of C
face of Comm
ommutato
utator with a sa
r with a sand pape
nd paper (#400)
r (#400)..
Inspection of insulation
Inspection of insulation
Check the insulation between Commutator and Armature shaft.
Check the insulation between Commutator and Armature shaft.
CAUTION
CAUTION
Clean up the armature by compressed air before checking.
Clean up the armature by compressed air before checking.
1
1
2
2
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