2
-
102
42hw-201601
Chapter 2 enGIne
3015r(h)/3515r(h)/4015r(h)/F36r(h)/F42r(h) traCtOr
6.6.5 COOLIn SyStem
This engine is water cooling type. Combustion heat
and oil heat are absorbed by coolant and emitting
those at the outside. As a result, engine can operate
normally the engine.
Coolant supplied by water pump circulates the oil
cooler through coolant hose and absorbs the oil heat.
And coolant absorbs combustion heat through water
jacket of cylinder block and coolant path of cylinder
head.
Coolant absorbing the oil heat and combustion heat
is sent to thermostat of water pump. If temperature
of coolant is lower than valve open temperature of
thermostat, re-circulate inside the cylinder. And if
temperature of coolant is higher than valve open
temperature of thermostat, flow the radiator. After
emitting the heat which absorbs from the coolant in
radiator, coolant again circulates to water pump.
K20W2A55
Connects the tester (Ω) in between the terminal and
the body, and check whether or not applying an electric
current. If applying an electric current, it is normality and if
not applying an electric current, replace the switch.
The thin rod puts in oil hole and slightly presses. At this
point, If applying an electric current, it is normality and
if not applying an electric current, replace the switch.
When inflicting an air press of 0.5kg/cm
2
in the
oil hole, it is normality if not applying an electric
current. At this point, check whether or not leak the
air and if leaking the air, the case which damages
the diaphragm. Therefore replace the switch.
K20W2A56
6.6.4 preSSure SwItCh
Pin
T
h
e.
wat
e
r
.p
um
p.
must
.c
h
ec
k
.
follow
i
ng
.i
t
e
m
..I
f
.
wat
e
r
.
p
um
p.i
s
.
d
e
f
ec
t
i
v
e
,
.
r
ep
la
ce.
wat
e
r
.p
um
p.
ass
e
mbly
.
1...Le
ak
.
of
.
wat
e
r
.p
um
p.
(
C
h
ec
k
i
f wat
e
r flows out from
C
h
ec
k
.i
f
.
wat
e
r
.
flows
.
out
.
from
.
th
e.
dra
i
n
.
hol
e.
on
.
th
e.
bottom
.
of
.
th
e. p
um
p.
body
.
dur
i
ng
.
o
pe
rat
i
on))
.
2..D
amag
e.
or
.c
ra
c
k
.
of
.
wat
e
r
.p
um
p.
body
3..D
amag
e.
or
.c
ra
c
k
.
of
.i
m
pe
ll
e
r
4...D
amag
e.
of
.
b
e
ar
i
ng
.
ass
e
mbly
.
(
W
h
e
n rotat
i
ng
W
h
e
n
.
rotat
i
ng
.
th
e.p
um
p.
shaft
.
g
e
ntly,
.i
t
.
should
.
b
e.
rotat
e
d
.
fr
ee
ly
.
w
i
thout
.
any
.i
nt
e
rf
e
r
e
n
ce.
))
CheCk the water pump
Содержание 3015h
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