Doosan D15S-5, Спецификации систем эксплуатации, испытания и регулировка

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Vehicle Systems Testing and Adjusting
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3. Damaged cylinders.
Probable Mechanical Cause:
1.
Not enough lubricant on the parts of the mast that
move.
2. Load rollers defective or not adjusted correctly.
3. Mast rollers not shimmed correctly.
4. Mast assembly is damaged or not in alignment.
Problem: The mast does not tilt correctly or
moves too slowly.
Probable Hydraulic Cause:
1. There is restriction in the hydraulic tilt lines.
2. There is an air leak, which lets air into the
hydraulic system on the inlet side of the hydraulic
pump.
3. The relief valve opens at low oil pressure.
4. The hydraulic pump has too much wear.
5. The internal valve of the tilt spool is stuck.
6. Control valve tilt spool has a restriction.
7. The priority valve does not work correctly.
8. Seals in tilt cylinder are worn or damaged.
9. Unload function doesn’t work correctly.
Probable Mechanical Cause:
1. Damage or failure of the tilt cylinders.
2. Mast mounting pins are seized.
Problem: The carriage will not lower correctly.
Probable Hydraulic Cause:
1. There are restrictions in the lift line.
2. The lift spool in the control valve has a restriction
caused by foreign material and does not operate
freely.
3. The lift cylinder flow regulator valve has a
restriction.
4. Air in the hydraulic system.
Probable Mechanical Cause:
1. The mast is not in alignment with the other lifting
components and does not move freely.
2. Carriage chains need an adjustment.
3. Not enough lubricant on the part of the mast that
moves.
4. The carriage or mast rollers and bearings are
worn and do not move (seized) or shimmed too
tight.
Problem: Unload function doesn’t work.
Unload function: Once the operator leaves a seat
more than 3 seconds or a start key is off, any
function (lift, tilt, auxiliary cylinder) doesn’t work even
though each spool is shifted in or out. If the operator
is seated on a key on, immediately each function will
normally work.
Probable Electric Cause:
1.
The electric switch (on-off) below a seat is
damaged.
2. The electric parts (relay and controller) related to
a solenoid valve for unload function in lift section
of control valve damaged.
Probable Hydraulic cause:
1. Hydrostator sleeve in control valve is stuck to a
housing.
2. Sleeve in a solenoid valve for unload function is
stuck to a housing.
Problem: Mast will not lower completely or will
not lower at all