Daewoo Solar 300LC-V, Manual

Page: 367 / 658

S0707315K
Page 23
Travel Motor (with Gearbox)
TROUBLESHOOTING, TESTING AND ADJUSTMENT
HYDRAULIC MOTOR
General Caution Matters
1. Before working, carefully judge the abnormal condition and be that there are not other causes
besides the motor.
2. As the causes of wear have lots of cases with mixing of foreign materials, when disassembling, be
careful not to mix foreign materials.
3. Since internal parts are accurately machined, be careful not to damage them when handling.
Inspection method of abnormality of hydraulic motor
1. Remove drain plug and check hydraulic oil in case.
2. Check of existence of abnormal noise. Check whether abnormal noises occur in motor itself.
3. Measurement of each part pressure.
Before disassembling, measure the circuit pressures to hydraulic motor and check existence of
abnormality.
Cause and remedy of trouble
Problem Possible Cause Remedy
Travelling device fails to operate.
Motor pressure
does not increase. Oil is bypassed at relief valve (350). Replace or repair relief valve.
Check spring damaged Replace check spring.
Counter balance valve spring damaged Replace counter balance valve
spring.
Passage in valve casing cracked Replace valve casing.
Contact surface of check worn abnormally Replace check.
Clearance between valve casing and
counter balance spool is big. Replace valve casing or counter
balance spool.
Coupling of reduction gear damaged Replace coupling after
disassembling reduction gear.
Pressure increases
but hydraulic motor
does not rotate. Orifice screw (546) plugged Clean or replace orifice screw.
Piston ring (707) and (708) damaged Replace piston ring.
Friction and separation plate stuck Replace friction and separation
plate.
Sliding surfaces stuck Replace sliding surfaces.
Orifice screw in counter balance spool
plugged Clean or replace orifice screw.
Gear of reduction gear damaged Replace gear after disassembling
reduction gear.