Hyundai HX130LCR Manual page 417

4. TRAVEL MOTOR
Problem
Does not Pressure is not
start developed
Pressure is
developed
Oil leakage Leakage from
engaging sur-
faces
Leakage from
casing
Leakage from
floating seal
Leakage from
hydraulic motor
Coasts on slope excessively ·
Excessive temperature on
reduction gear case
Meanders Meanders at
low pressure
Meanders at
high pressure
Meanders at
high pressure
Pump delivery is poor
External leakage of motor is
excessive
Cause
·
Pump failure
·
Control valve malfunction
·
Brake valve failure
-Sleeve stick
-Check valve stick
·
Motor failure
-Valve seat seizure
·
Gear broken and fragment locked
·
Overloaded
·
Scratch on engaging surfaces
·
Loosening by poor bolt tightening
·
Plug loosened
·
Crack formed by stone
·
Sliding surfaces worn
·
Creep on O-ring
·
Bolt loosened
·
O-ring damaged
·
Sealing surface scratched
Poor volumetric efficiency of hydraulic
motor
·
Increase of internal leakage of brake
valve
·
Parking brake not actuated
-Spring breakage
-Wear of friction plate
·
Pitting on bearing
·
Lack of gear oil
·
Hydraulic oil introduced to gear case
·
Delivery rate is different between right
and left
·
Motor drain rate is different between
right and left
·
Delivery rate is different between right
and left
·
Motor drain rate is different between
right and left
·
Relief pressure dropped at right and
left brake valve
·
Main relief pressure dropped at right
or left of control valve
·
Regulator operation poor
·
External leakage of pump is exces-
sive
-
7-24 7-24
Remedy
·
Check if action other than traveling is
available. If faulty, repair.
·
Check if spool moves correctly. Repair if
necessary.
·
Replace brake valve
·
Replace
-Check hydraulic oil for contamination
·
Replace reduction gear
·
Reduce load
·
Correct surfaces by oilstone or sandpa-
per or replace
·
Check after retightening
·
Retighten
·
Replace reduction gear
·
Replace reduction gear
·
Replace floating seal
·
Tighten properly
·
Replace O-ring
·
Correct by oilstone or sandpaper
·
Replace hydraulic motor
·
Replace brake valve
·
Replace spring
·
Replace parking brake
·
Replace reduction gear
·
Supply gear oil properly
·
Check motor and replace oil seal
·
Repair pump
·
Replace motor
·
Repair regulator or pump
·
Replace motor
·
Replace brake valve
·
Replace main relief valve
·
Repair regulator
·
Repair pump
· Replace motor