Hyundai R 160 LC-3, Service Manual

Page: 228 / 459

6 - 9
4. SWING SYSTEM
BOTH LH AND RH SWING ACTIONS ARE IMPOSSIBLE 1)
YES
NO
Are attachment
and travel motions
impossible at all?
Is safety valve
pressure within
standard?
NO
NO
NO
YES
YES
NO
NO
NO
YES
NO
YES
NO
YES
NO
YES
Is gear pump pilot
pressure within
standard level?
Is MCV pilot
pressure within
standard level?
Is swing brake
release valve
faulty?
Are broken pieces
of coupling present
when dust plug
under engine fly
wheel is removed?
Does not symptom
change when front
and rear pump
discharge hoses
are exchanged?
YES
NO
YES
NO
YES
NO
YES
NO
YES
Is oil in hydraulic
tank within
standard level?
Does RH travel
function?
Cause Remedy
Safety valve faulty
or not operated.
Gear pump faulty.
Pump connection
coupling is broken.
Hydraulic pump is
out of order.
Swing control valve
spool is stuck.
Hydraulic pump is
broken.
Swing brake
release valve is
broken.
Swing reduction
unit is broken.
Swing motor is
broken.
Pilot relief valve is
faulty.
Gear pump is out
of order.
Pilot valve is
broken.
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.
ڞ
ڟ
ڠ
ڞ
Is not main relief
valve faulty?
Does swing control
valve spool move
lightly by hand?
Does swing motor
rotate?
Is gear pump
delivering oil?
Is not there oil
leakage from pilot
piping or is not it
clogged?
ڟ
ڠ
Is gear pump pilot
pressure within
standard level?
YES
YES