Catalogue HY29-0037-M1/UK
Overall Hydraulic Motors, Fixed
M5AS - M5ASF Denison Vane Motors
33
Parker Hannifin SAS
VPDE, Denison Vane Motors
Vierzon - France
5 . Unusual noise level
6 . Unusual heat
7 . Shaft end leakage
a-1) Check if there is no air intake that could aerate the fluid.
a-2) Check if the motor is not cavitating. It could be that the inertia of the
load is such that it drives the motor faster than the flow coming from the
pump.
a-3) Check if the fluid is suitable for the use.
a-4) Check if the air bleed off has been done properly.
b-1) Check the back pressure to see if the replenishment pressure is not too
low, leading to cavitation of the motor.
a-1) Check if a cooler is required or, if there is one, if it is well dimensio-
ned.
a-2) If there is a cooler, check if it is working (example for water cooler : is
the water flow open or sufficient).
a-3) Check if the hydraulic circuit is not bringing back the flow directly to
the inlet port. Doing so, it would create a small closed circuit not able to cool
down the fluid.
a-4) Check the quality of the fluid.
a-5) Check the velocity of the fluid (6 m/s max.).
a-6) Check the filtration unit, its capacity.
a-7) Check if the heat does not come from an open bypass valve.
b-1) Check the speed of rotation versus the catalogue values.
b-2) Check the pressure rating.
b-3) Check the fluid type.
b-4) Check the viscosity.
a-1) Check that the shaft bearing is not damaged (dark grease leaking out
of the ball bearing).
a-2) Check that the drain line is not too much pressurized, wich could have
destroyed the shaft seal inside the motor (fluid leaking outside the shaft
bearing race).
a-3) Check that the environment, the fluid temperature and viscosity are
appropriate (melted grease due to too high temperature or oil leakage due
to a burned shaft seal).
a-4) Check if there is no high overshoot at start-up that would create a high
instant internal leakage.
a-5) Check, when using a “quick coupling connector” for the drain line, that
it is correctly locked.
a-6) Check the alignment of the shafts.
b-1) Check that the shaft bearing is not damaged (dark grease leaking out
of the ball bearing).
b-2) Check that the drain line is not too much pressurized, which could have
destroyed the shaft seal inside the motor (fluid leaking outside the shaft
bearing journal).
b-3) Check that the environment, the fluid temperature and viscosity are
appropriate (melted grease due to too high temperature or oil leakage due
to a burned shaft seal).
a) Is the motor run-
ning?
b) When is the motor
braking?
a) Is the fluid arriving
to the motor already
hot?
b) Is the fluid heating
up when going throu-
gh the motor?
a) Is it leaking when
pressurized?
b) Is it leaking when
standing still?
7 . TroubleSHooTing guiDe :
Vane troubleshooting guide
