Yanmar 3JH3E - 10. Tachometer; 10-1 Construction of tachometer; 10-2 Specifications and dimensions of tachometer

Chapter 9 Electrical
System
_1_0._T_a.;...c.;...h..;.o_m_e_te_r
___________________________
3,4JH3(B)(C)E
10. Tachometer
10-1 Construction of tachometer
The tachometer indicates the number of revolutions per
minute
by
means of
an
electrical input signal which is gen-
erated as a pulse signal from the magnetic pickup sender
(MPU sender).
The function of the sender
is
to convert the rotary motion
into
an
electrical signal by
counting the number of teeth of
the ring gear connecting with the flywheel housing.
0
,
Rotation
detecting
sender
Cl--
Tachometer
sensor
I
Red/black
Orange
Blue/red
Black
Tachometer
10-2
Specifications
and
dimensions
of
tachometer
(~)
Specifications
Rated voltage
DC
12V
Range
of
operating voltage
10~15V
illuminaMn 3.4W / 12V
I
No. of teeth 116
Ring gear
lt-------t--------
Module 2.54
Part
No.
of sender unit
128170-91160
(2)
Sensitivity limit of sender unit
Ring
gear
speed
(m/sec)
J
8
6
Good
zonel
I
/
4
./
V
NG
zone
2
0
/
L---
L.,.----"'
I
----
0,5
1.0
1.5
2,0
Sender
unit
and
gear
clearance
C
(mm)
C
(3)
Dimensions of sender unit
25+os
-
.
34 5
5
4.5
1,5-
i--
3
15.5
~
L..
;[
'
~.
17
~
~
\
~
'
M18
X
P15
(4)
Dimensions and shape of tachometer
72.3
10
l_
Identification
mark
2.5
mm
!~
9-48
Printed in Japan
HINSHI-H8009