Shibaura CM284, Руководство по ремонту

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132
9. TROUBLE SHOOTING AND SPECIFICATIONS
1) Trouble
Shooting
CONDITION POSSIBLE CAUSE REMEDY
1. Output shaft fails to rotate
when the HST pedal is set
position.
1. Improper operation of HST
pump or motor.
2. Damaged charge pump
3. Charge pump pressure low.
4. High pressure relief valve set too
low.
5. Defective HST check valve.
6. Low pressure relief valve set too
low.
7. Air is mixture in the HST oil.
Check the trunnion shaft movement and replace
the assembly.
Measure the charge pressure and replace the
assembly.
Check the low pressure circuit relief valve and
replace defective parts.
Check the high pressure circuit relief pressure.
Replace valve if necessary.
Replace check valve and spring.
Check the low pressure circuit relief valve.
Check the suction piping connection and
transmission oil level.
2. Output shaft fails to stop
rotating with the HST
pedal in the neutral
position.
1. Defective check and high
pressure relief valve.
2. Linkage out of adjustment.
3. Defective the seat of check and
high pressure relief valve.
Disassembly and clean. If condition still exists,
replace valve.
Adjust linkage.
Replace the defective parts.
3. Low power and rpm of
output shaft
1. Lack of oil in the HST circuit by
clogged oil filter.
2. Air is mixture in the HST oil
circuit.
3. Lack of charge pump capacity
by abnormal oil temperature.
4. High pressure oil leakage due to
wear of the pump and motor
assembly.
Replace the oil filter.
Check the suction piping connection and
transmission oil level.
Warm up the tractor when too low oil temperature.
Stop the engine until the oil temperature become
low when too high oil temperature.
Wash oil circuit and replace the HST pump and
motor assembly.
4. Abnormal sound from the
HST
1. Sucked air in the HST circuit.
2. Lack of oil in the HST circuit by
clogged oil filter.
3. Lack of charge pump capacity
by abnormal oil temperature.
4. High pressure oil leakage due to
wear of the pump and motor
assembly.
5. Linkage out of adjustment.
Check the suction piping connection and
transmission oil level.
Replace the oil filter.
Warm up the tractor when too low oil temperature.
Stop the engine until the oil temperature become
low when too high oil temperature.
Wash oil circuit and replace the HST pump and
motor assembly.
Adjust linkage.
5. Oil leaks at shaft and seal. 1. Oil leakage due to damaged oil
seal or O-ring.
2. HST case internal pressure too
high.
3. HST case oil return tube to front
case plugged.
Replace damaged seal or O-ring.
Check for worn piston pump or motor and replace
if necessary. Case pressure should not exceed 1
MPa {1.0 kgf/cm
2
}.
Remove and check tube for restrictions.
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