Barko 830B, Руководство по обслуживанию

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SERVICE- HYD PUMP T6, T7 VANE
(continued...)
3. TROUBLESHOOTING
6.
7.
Unusual heat level
Shaft seal leakage
a) Does the heat appear
when the pump is running
without pressure?
b) Is the seal only leaking?
a) Is the seal destroyed?
b) Does the heat appear
when the pump is running
with pressure?
a-1) Check the oil level and the suction pipe. Is the oil
coming to the pump (check the length of the pipe, its
internal diameter, all that could influence the inlet
pressure)?
a-7) Check the quality of the fluid.
a-1) Check the alignment and the correct power
transmission (non homokinetic movement, high radial
force as examples).
a-3) Check if the flow versus the volume of oil in the tank
is correct to obtain a good cooling effect.
b-4) Check if the seal material has not been modified
because of a too warm environment. The seal can
vulcanize and stop sealing correctly.
b-2) Check the pressure rating.
a-2) Check if the air bleed has been done correctly.
a-6) Check if the hydraulic circuit is not bringing back the
flow directly to the inlet port. Doing so, it would create a
very small closed circuit not able to cool down the fluid.
a-9) Check the filtration unit, its capacity and if the heat
does not come from the open by-pass valve or if it is
under-dimensioned (bigger delta P).
b-1) Check the viscosity.
b-3) Check if the cooler is working correctly or well
dimensioned.
b-3) Check if the inlet pressure is not over or under the
catalog values. This has to be done for the whole cycle
because the inlet pressure can vary from time to time.
a-5) If there is a cooler, check if it is working (example for
water cooler: is the water flow open or sufficient).
b-4) Check if the relief valve is not creating this heat
because always open.
a-3) Check if the bad suction conditions do not create a
vacuum that could even reverse the seal lip.
a-4) Check if a cooler is required or, if there is one, if it is
well dimensioned.
b-5) Check if any other component in the system is not
creating this heat due to an internal defect.
b-2) Check if seal lip has not been cut during a
maintenance operation.
b-6) Check if there is a big temperature differential
between the inlet and the outlet.
b-1) Check the alignment of the front shaft and check if
there is not any radial load.
a-4) Check if the external environment is not too dirty and
therefore ruining the seal.
a-2) Check the inlet pressure and compare it to the
catalog values.
a-8) Check the velocity of the fluid.
b-6) Check if the chosen seal (high pressure seal for
example) is not too stiff for the use. If the environment
requires some elasticity due to a gentle misalignment, a
high pressure seal will not be able to follow the movement
and therefore leak.
b-5) Check the acidity of the oil that can «burn» the seals
material. It will therefore destroy the elasticity of the
sealing.
06/05/2019
Updated
SERVICE