Maintenance - Danfoss Vickers PVM User Manual

User Manual
ATEX / UKEX Certified Variable Axial Piston Pumps for Industrial Applications – PVM 18 – 141 cc

Maintenance

Vickers by Danfoss | January 2024
Warning
If maintenance has to be performed in an explosive and hazardous atmosphere, an anti-sparking safety
tool must be used.
Maintenance measures involving disassembly or opening of the pump must only be carried out in non-
explosive atmospheres.
Prior to loosening any connection of the hydraulic system, ensure the residual pressure has been removed
from the system in a safe manner.
With hydraulic systems the main criterion for reliability and operating life is very thorough regularly
maintenance.
Regularly check the system for presence of leakage and the oil level. The equipment must be regularly
serviced and cleaned in the explosive atmosphere. The intervals are specified by the operator on-site in
accordance with the environmental impact to which the equipment is exposed.
During system's function, it is necessary regularly to verify that the temperature of the ambient and the
operating oil are those initially determined. Replenish and change the oil, the oil and air filters as stated in
the respective instructions.
Regularly check the condition of the oil – viscosity, oxidation, filtration level etc:
Verify that the viscosity level is within the recommended values as indicated in
Viscosity
Table 3: Fluid Viscosity and Temperature Rating of PVM ATEX / UKEX Units
page 8.
Mineral oil gets oxidized proportional to the usage degree and operating
Oxidation
temperature. The oxidation of oil is evident because of its change of color, bad
smell, acidity increase and because of the generation of sludge inside the tank.
In case symptoms of this kind are detected, the system oil must be
immediately changed.
The presence of water inside oil can be determined by taking oil samples from
Water presence
the bed of the oil tank: oil floats on water, if present, water tends to stay on the
tank's bed. If its presence is determined, water must be regularly purged.
Presence of water in the hydraulic system can severely damage the pump.
A high degree of contamination of the operating oil causes a severe wear of all
Degree of
hydraulic components: for this reason, the cause of the contamination must
contamination
be identified and eliminated. In order to avoid mixing of different oils, when
replacing the operating fluid. It is necessary to empty all the machinery and
pipes, clean them carefully and clean the tank.
on
BC479055194216en-000101 | 13