Hyundai HX145LCR Manual page 369

2) 2) SPEED ON ONE SIDE FALLS AND THE MACHINE CURVES SPEED ON ONE SIDE FALLS AND THE MACHINE CURVES
Has travel spool
YES
changed over
positively?
Is the lower
speed (bucket or
arm) within
standard level?
Do LH and RH
travel speeds
change over when
NO
travel relief valves
are exchanged?
YES
Do LH and RH
travel speeds
YES
change when LH
and RH travel
brake valves are
exchanged?
NO
YES
Does spool move?
NO
See Note 5, 6
NO
YES
YES
Is external pilot
pressure within
NO
standard level?
NO
YES
Is drain rate of
ⓐ
travel motor within
standard level?
NO
6-14
Brake valve is
defective.
YES
Relief valve built
Does the symptom
change when
in travel motor is
relief valves in
faulty.
LH and RH
travel motors are
ⓐ
exchanged?
NO
Control system is
faulty.
Control valve
spool is stuck.
Travel relief valve
is faulty.
Does the symptom
change when A1
YES
and A2 pump
Hydraulic pump is
discharge hoses
broken.
are exchanged?
External pilot
piping is clogged
or oil is leaking
Does travel speed
from it.
change when
parking brake
YES
Travel motor's
spring in the
travel motor is parking brake is
removed?
not released
properly.
Travel motor is
faulty.
Cause Remedy
Disassemble
and repair or
replace.
Disassemble
and repair.
Disassemble,
inspect and
repair.
Disassemble
and repair.
Disassemble
and repair or
replace.
Disassemble
and repair.
Disassemble
and clean.
Disassemble
and clean pilot
piping.
Disassemble
and repair.