Komatsu 75001, Руководство по ремонту

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SEN03849-00
WA250, 250PZ-6 40-500
9
500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-2 The travel speed is slow
H-2 The travel speed is slow
1
Ask the operator about the following:
q
Did the travel speed suddenly become
slower?
o Breakage of HST pump and motor
related equipment
q
Was there any problem of travel speed
becoming slower before?
o Internal wear of HST pump and
motor related equipment, defective
seal
Inspection before diagnosis
q
Are the oil level in the hydraulic tank and
the oil type appropriate?
q
Is the inching valve linkage adjusting
appropriate?
q
Is the any external oil leak found around
the hydraulic piping, pump and motor?
Cause
HST pump HST motor 2
HST
motor 1
Others
a b c d e f g h i j k l m n o
P
um
p
bo
dy
(
P
is
ton
p
um
p
en
d)
P
u
mp
b
o
d
y
(C
ha
rg
e p
u
m
p
en
d)
H
igh
p
ress
u
re
r
e
lief
va
lv
e
Lo
w
p
res
s
ur
e
r
e
lief
va
lv
e
(C
ha
rge
r
e
lief
va
lv
e)
DA
v
a
lv
e
D
ir
e
c
tio
na
l s
o
le
no
id
v
a
lv
e
Mo
to
r bo
dy
M
o
d
e
s
e
le
ct
or
s
o
le
no
id
v
a
lv
e
(
S
O
L
a)
A
n
g
le
st
op
pe
r s
o
le
n
o
id
va
lv
e (
S
O
L
b)
Mo
to
r bo
dy
A
n
gl
e s
to
p
p
e
r co
nt
ro
l s
o
le
n
o
id
v
a
lv
e
In
ch
in
g va
lv
e
In
ch
in
g v
a
lv
e lin
k
a
g
e
C
lu
tc
h
s
o
le
no
id
Cl
u
tc
h
No.
Remedy
Diagnosis
E
X
E
X
E
X
E
X
E
X
E
X
E
X
E
X
E
X
E
X
E
X
E
X
E
X
A
E
X
E
X
1 Travel speed is slow in both forward and reverse
Q Q Q Q Q Q Q Q Q Q Q Q Q
2
The travel speed is slow at forward (Reverse is nor-
mal)
Q Q
3
The travel speed is slow at reverse (Forward is nor-
mal)
Q Q
4
Maximum travel speed in both forward and reverse
is approx. 4 km/h
Q
5
Maximum travel speed in both forward and reverse
is approx. 18 km/h
Q
6
Abnormal sound comes from motor in both forward
and reverse when travel speed is 10 km/h or more
Q Q