Komatsu 75001, Руководство по ремонту

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SEN03849-00
40-500
6
WA250, 250PZ-6
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Failure code and cause table
Failure code and cause table
1
Part causing problem
Da
m
p
e
r
HST pump
HST
motor 2
HST
motor 1
In
c
h
in
g
v
a
lv
e
In
c
h
in
g
v
a
lv
e
lin
k
a
g
e
Failure Code
P
u
m
p bod
y (P
is
to
n pum
p
end
)
P
u
m
p
bod
y (C
ha
rge
p
u
m
p
en
d)
H
ig
h
p
re
s
s
u
re
r
e
lie
f
va
lv
e
Hi
g
h
p
re
ssu
re
cu
t-
o
ff va
lve
Lo
w pr
e
s
s
u
re
re
lie
f
va
lv
e
(C
h
a
rg
e re
lie
f v
a
lv
e)
DA
va
lv
e
D
ir
e
ct
io
n
a
l s
o
le
n
o
id
v
a
lv
e
M
o
to
r bo
dy
M
o
d
e
se
le
cto
r so
le
n
o
id
va
lv
e
(S
O
L
a
)
A
n
gl
e s
to
ppe
r s
o
leno
id v
a
lv
e
(S
O
L
b
)
M
o
to
r bo
dy
A
n
gl
e s
to
ppe
r c
o
nt
rol
s
o
le
n
o
id
va
lve
HS
T
re
la
te
d
Does not travel forward or in reverse Q Q Q Q Q Q Q Q Q Q Q
Does not travel forward (reverse is normal) Q Q
The machine does not start at reverse (Forward is normal) Q Q
Speed is slow in both forward and reverse Q Q Q Q Q Q Q Q Q Q Q
The travel speed is slow at forward (Reverse is normal) Q Q
The travel speed is slow at reverse (Forward is normal) Q Q
The traction force is weak in both forward and reverse Q Q Q Q Q Q
The traction force is weak at forward (Reverse is normal)
Q
The traction force is weak at reverse (Forward is normal) Q
Engine stalls when traveling or engine speed drops excessively Q Q Q
The gear is not shifted Q Q
S
teer
ing
w
heel
The steering wheel does not turn
The steering wheel is heavy
There is play in steering wheel or excessive shock
Machine deviates naturally to one side when traveling
Br
a
k
e
The brake does not work or does not work well
The brake is not released or is dragged
Wor
k eq
ui
pm
e
nt
s
y
st
em
The lift arm does not rise or lower Q Q
The lift arm moves slowly or the lift arm rising force is insufficient Q
When the lift arm is rising, the lift arm comes to move slowly at
specific height
The lift arm cylinder cannot be hold down the bucket
(The bucket rises in the air)
Hydraulic drift of the lift arm occurs often
The lift arm wobbles during operation
When the control lever is switched from “HOLD” to “RAISE”, the lift
arm falls temporarily
The bucket does not tilt back Q Q
The bucket moves slowly or the tilting-back force is insufficient Q
The bucket comes to operate slowly in the midst of tilting-back
The bucket cylinder cannot be hold down to bucket
Hydraulic drift of the bucket occurs often
The bucket wobbles during travel with load
(The work equipment valve is set to “HOLD”)
When the control lever is switched from “HOLD” to “TILT”, the bucket
falls temporarily
The control levers of the lift arm and bucket do not move smoothly
and heavy
EC
S
S
(i
f equi
pp
ed)
ECSS does not operate but pitches and bounces
ECSS does not move at all
H
y
d
ra
u
lic
fa
n
Fan revolution is abnormal (Fan sound/vibration is abnormally large
or engine overheats)
Fan always revolves in reverse