Hyundai r35z-7 Workshop Manual page 197

2)
S S PEED ON ONE SIDE FALLS AND THE MACHINE CURVES
Has control valve
YES
spool 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
lightly when it is
cut off from
NO
control spool?
NO
YES
NO
YES
Is leak rate of
travel motor within
standard level?
NO
5-14
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.
Hydraulic pump is
broken.
Does travel speed
change when
parking brake
YES
Travel motor's
spring in the
parking brake is
slower travel
motor 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 pilot
piping.
Disassemble
and repair.