Axial Piston Pump
Series PV, series 47 and higher
Bulletin MSG30-3245-INST/UK
Installation manual
3
Parker Hannifin Manufacturing Germany GmbH & Co. KG
Pump & Motor Division Europe
Chemnitz, Germany
1. Installation and start-up
For a safe and disruption free operation of any
machine or system a careful installation and start
up according to the manufacturers instructions
is mandatory.
Hydraulic systems can be designed for many
totally different functions and they require con-
sequently different start up procedures. The
hydraulic pump is in this respect only one, but
nevertheless a very important component of the
whole system.
A general start up instruction therefore can give
many helpful hints but it needs to be completed
by specific additions depending of the individual
nature of the system or power unit.
During installation and start up the following steps
need to be carried out carefully:
Visual inspection
Make sure that all components of the shipment
are complete, free of any damage, free of outside
contamination and properly protected against
ingression of contamination.
Cleanliness
Contamination of any kind is the enemy of any
hydraulic component. It is still the number one
cause for component failure. Therefore
maxi-
mum care
and
cleanliness
are required during
all handling and managing of parts that come in
contact with the hydraulic fluid. All ports of the
pumps and other components must be covered
until pipes or hoses are mounted to them. Per-
form assembly preferrably in a dry and dust free
room. Use only suitable tools.
Installation
Installation horizontal or vertical, avoid rigid con-
nection from pump to reservoir cover or frame
and to inlet and outlet piping to prevent excitation
of the whole system due to pump vibrations.
Suction port
Position to the side or to the bottom, max. fluid
velocity approx. v = 1.0 m/sec, cut suction pipe
inlet under 45°. Minimum distance from bottom
2 – 3 times diameter and, even at lowest fluid
level, approx. 200 mm below fluid level. Inlet pres-
sure, even during compensation, never should
drop below 0.8 bar (absolute).
Absolute gas tight connection (risk of cavitation,
noise). Air bubbles due to vacuum in the inlet
can destroy pumps within a short time due to
cavitation erosion. Suction pipe should be as
short as possible. Use only clean, low pressure
pipe, avoid sharp elbows and any restriction of
cross section.
The suction pipe must have access to clean,
cooled and filtered fluid, free of air bubbles. No
turbulences or high flow velocities should occur
at the tube inlet. Therefore position inlet as far
as possible away from return line and drain line.
Make sure that the fluid circulation in the reservoir
does keep return flow from suction pipe inlet. In
case of positive head use shut off valve in the inlet,
monitored with proximity switch or equivalent to
avoid start up of motor when valve is closed. When
installed into the reservoir use short suction pipe
with pipe end cut under 45°.
Pressure port
Select correct pressure rating for pipe, hose and
connectors. Take pressure peaks into account.
Dimension the piping according to the port size.
Prevent excitation of the system by using flexible
port connections.
Drain port
Always use highest possible drain port of the
pump. Drain port must be higher than pump
centerline or install additional air bleed line. Never
combine pump drain line with other return lines
and/or drain lines. Pump shall not be able to run
empty. Max. allowable case pressure
≤
0.5 bar
(2 bar peak), also during compensation.
Use low pressure pipe/hose, as short as possible
and full cross section according to port dimen-
sion. Do not use elbows or sharp corners. When
drain port is on the side of the pump drain line
should have bridge higher than pump top (also
when installed in reservoir). Drain pipe must
end at least 200 mm below fluid level even at
lowest filling level. Never let drain flow go direct
into suction area of reservoir (temperature, air
bubbles). Max. length 2 m, otherwise use larger
pipe diameter than port size.