Hyundai HX130LCR Manual page 332

4. SWING SYSTEM
BOTH LH AND RH SWING ACTIONS ARE IMPOSSIBLE
1)
Is oil in hydraulic
YES
tank within
standard level?
Are attachment
and travel
motions
impossible at all?
Is RH travel
function normal?
NO
NO
YES
Is gear pump pilot
pressure within
YES
standard level?
See Note 1
NO
YES
Are broken pieces
of coupling present
ⓐ
when dust plug
under engine fly
wheel is removed?
NO
YES
Is MCV swing
YES pilot pressure
within standard
level?
NO
See Note 2
Does not symptom
change when A1
YES
and A2 pump
NO
discharge hoses
are exchanged?
YES
Is swing parking
brake release
ⓑ
valve faulty?
NO
NO
Is gear pump pilot
pressure within
ⓒ
standard level?
See Note 1
YES
6-9
YES
Does safety
ⓐ
solenoid valve
operation
Safety solenoid
normal?
NO
valve faulty or not
operated.
Gear pump faulty.
Pump connection
coupling is broken.
NO
Is main relief
Hydraulic pump is
valve faulty?
out of order.
NO
Swing control valve
Does swing
control valve spool is stuck.
spool move?
ⓑ
YES
See Note 5
ⓒ
Hydraulic pump is
broken.
Swing parking
brake release valve
is broken.
YES
Swing reduction
unit is broken.
Does swing
motor rotate?
Swing motor is
NO
broken.
YES
Pilot relief valve in
gear pump is faulty.
Is gear pump
delivering oil?
Gear pump is out of
NO
order.
YES
Is there oil
leakage from
pilot piping or is it
clogged?
RCV is broken.
NO
Cause Remedy
Replenish
specified oil to the
standard level.
Repair or replace.
Repair or replace.
Disassemble and
repair.
Disassemble and
repair.
Disassemble and
repair.
Disassemble and
repair.
Disassemble and
repair.
Disassemble and
repair.
Disassemble and
repair.
Disassemble and
repair or replace.
Disassemble and
repair.
Clean pilot piping
interior or repair
piping.
Disassemble and
repair.