Travel Motor Component Troubleshooting - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service
g. Travel motor component troubleshooting
In case of any trouble arising during running, investigate the cause and take an appropriate remedial
measure by referring to the Table of Troubleshooting shown below.
(1) Main function
Trouble
1. Motor will not rotate.
2. Motor rotating speed is slow.
3. Motor rotating speed fluctuates
considerably.
4. Oil leak
5. Machine travels obliquely
Possible Cause
Any other equipment than motor,
counter-balance valve and reduc-
tion gear malfunctions
Hydraulic pressure is relieved due
to abnormal abrasion of the motor
sliding part.
Malfunction due to damaged major
part(s) of the motor
Due to any trouble with the hydrau-
lic pump and pressure control valve,
oil is not fed at specified flowrate,
thus lowering the motor rotating
speed.
Due to lowering of volumetric effi-
ciency, specified motor rotating
speed cannot be attained.
Due to abrasion of motor sliding
parts, a large amount of high-pres-
sure oil leaks and flows out of the
drain port, thus lowering and fluctu-
ating the motor rotating speed con-
siderably. Abrasion of bearing
causes also fluctuation of motor
rotating speed.
Oil leaks due to damaged oil seal(s)
or O-ring(s).
1.Excessive different track tension.
2.Different pump delivery
3.Different motor drain
4.Oil leak in swivel joint
5.Motor relief valve opens one side.
6.Counterbalance spool sticks in
one side.
IV-S-18
Remedy
Check to see if specified pressure
of hydraulic oil reaches the motor
inlet side, and then check and repair
the relevant equipments.
Replace abnormally worn part(s).
Eliminate flaws and burrs on the
surface and clean all the parts
before re-assembling.
Disassemble the motor and replace
the damaged part(s). After cleaning
all the parts, re-assemble them,
using care not to allow entry of for-
eign matter.
Check to see if oil flows to the motor
inlet side at specified flowrate, and
then check and repair the relevant
equipments.
After disassembling the
check the sliding parts for any
abnormal abrasion. If any, repair or
replace worn part(s).
Disassemble the motor and replace
worn parts if any. After cleaning all
the parts, re-assemble them, using
care not to allow entry of foreign
matter.
Replace damaged oil seal(s) or O-
ring(s) with new one(s). At this time,
use due care not to damage the oil
seal lip.
Apply grease slightly to O-ring
before re-assembling.
1.Check the track sag distance
2.Swap the pump delivery hoses
and check
3.Swap the motor hoses and check
4.Check the motor (track) speed
5.Check the motor operating pres-
sure and think
6.Check the drain amount and think
Hydraulic system
motor,