Pilous ARG 250 plus S.A.F., Инструкция по эксплуатации, Страница: 40 / 47

Brief survey of defects
, which can occur on a hydraulic device. An open circuit consisting of standard components is considered.
I. The hydrogenerator does not supply oil
a) reversed sense of rotation of hydrogenerator,
b) not sufficient oil in tank,
c) suction piping closed,
d) suction piping leakage,
e) zero geometrical volume set with control hydrogenerator,
f) oil viscosity does not comply with the specified value,
g) hydrogenerator failure.
II. Oil contains air bubbles (pressure aggregate is noisy - hydraulic device running is unsteady)
a) the new circuit has not been sufficiently vented,
d) suction piping leakage,
c) suction piping is not fully immersed in oil,
d) circulating oil is not fed under the level and entrains air,
e) hydrogenerator shaft sealing is damaged,
f) incorrect design of suction piping big negative pressure in suction part (cavitation),
g) temperature too low for the specified oil,
III. Increased mechanical noise
a) drive is not trued up,
b) drive coupling damaged,
c) damaged or ruined bearings,
d) damaged rubber mounting of drive equipment,
e) air infiltration.
IV. Hydrogenerator supplies oil but pressure does not increase
a) hydraulic circuit unloaded,
b) safety valve defect,
c) pressure manifold connected to drain, probably in distributor,
d) hydrogenerator functional surfaces are worn,
e) hydraulic unit leakage portion of oil leaks outside the working space.
V. Increase of hydrogenerator loss flow (refers also to rotating hydromotor)
a) degree of hydrogenerator functional surface wear and tear is high due to the influence of impurities contained in oil,
b) low viscosity superheated oil,
c) mechanical failure of hydrogenerator.
VI. Hydrogenerator has seized
d) the basic parameters overload have not been adhered to,
b) damage due to cavitation,
c) damage by solid particles contained in oil,
d) the specified oil viscosity has not been adhered to,
e) inappropriate kind of oil,
f) hydrogenerator life has been exceeded,
g) permissible radial and thrust forces at the output shaft have been exceeded.
VII. Overheating of oil in tank
a) efficiency has decreased due to wear and tear; loss flow of hydrogenerator has sufficiently increased; a portion of energy supplied
changes to heat,
b) some of the elements is leaking, portion of pressure oil flows to drain,
c) tank capacity is small, the heat exchanging surface is insufficient,
d) external source of heat,
e) element base in circuit is inappropriately designed.
VIII. Hydraulic circuit does not comply with designed parameters
a) hydrogenerator flow does not comply with the original calculation,
b) two or more functions take place at the same time,
c) hydraulic device is undersized or oversized,
d) increased pressure loss of piping,
b) some of the elements is leaking, portion of pressure oil flows to drain,
f) gradual fouling of pressure filter.