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Yanmar 4LHA-HTP User Manual

Yanmar 4LHA-HTP
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Chapter
9
Electrical System
7. Tachometer
4LHA Series
7.
Tachometer
7-1
Construction
of
tachometer
The tachometer indicates
the
number
of
revolutions
per
minute
by
means
of an
electrical
input
signal which
is
generated as
a
pulse signal
from
the
magnetic pickup
sen-
der
(MPU
sender).
The function
of the
sender
is to
convert
the
rotary
motion
into
an electrical signal
by
means
of
counting
the
number
of
teeth
of the
ring gear connecting
with
the
flywheel
housing.
Tachometer sensor
Red/black
Orange
Blue/red
Rotation Black
detecting sender
Tachometer
7-2
Specifications
and
dimensions
of
tachometer
(1) Specifications
Rated
voltage
DC
12V
Range
of
operating voltage
10 <* 15V
Illumination
3.4W/12V
Ring
gear
No.
of
teeth
127
Ring
gear
Module
254
Part No.
of
tachometer
120130-91200
(128696-91100)
Part No.
of
sender
unit
128170-91160
(2) Sensitivity
limit
of
sender
unit
Ring
gear speed
(m/sec)
10
G
zone
/
NG
zone
0.5
1.0 1.5 2.0 2.5
Sender
unit
and
ring gear clearance
C (mm)
Ring
gear
Sender
unit
(3) Dimensions
of
sender
unit
25 ±0.5
(0.9646 ~ 1.0039)
1.5 (0.0591)- -3(0.1181)-
34.5(1.3583)
5(0.1969) 4.5(0.1772)
15.5
(0.6102)
M18x P1.5
(4) Dimensions and shape
of
tachometer
72.3 (2.8465)
10 (0.3987)-
mm
(in.)
Identification
mark
9-40

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Yanmar 4LHA-HTP Specifications

General IconGeneral
BrandYanmar
Model4LHA-HTP
CategoryEngine
LanguageEnglish

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