FLUID RECOMMENDATIONS
Mineral Oil
A high-grade premium petroleum-
based fluid should be used to assure
long component and system life.
The fluid should have a combina-
tion of anti-wear, demulsibility,
rust protection, oxidation-resistant
and foam-resistant properties.
Special Fluids
Some pump models may require
reduced operating pressures when
using low-lubricity fluids.
Because of the wide range of fluid char-
acteristics, contact the sales depart-
ment for a review of any application
using non-petroleum based fluids.
Viscosity Specifications
Using fluid with the correct viscosity
range is critical to achieving long
component life. Fluid conditions out-
side the “Optimum” range shown in
the table may result in reduced pump
output, requiring pressurized inlet
conditions. For more information,
contact the sales department.
Hydraulic Fluid Viscosity
➀
Operating
Start-up
Pump
Models
Minimum
Optimum
Maximum
SUS
cSt
SUS
cSt
SUS
cSt
SUS
cSt
Fixed Displacement Pumps:
PF500-10
52
8
98 to 324
20 to 70
1911
413
3706
800
PF1000-10
59
10
98 to 324
20 to 70
1911
413
3706
800
PF1300-10
31
1,5
–
–
927
200
927
200
PF2000
59
10
98 to 324
20 to 70
1911
413
1911
413
PF2000
➁
34
2,3
98 to 324
20 to 70
1911
413
1911
413
PF3000-10
59
10
98 to 342
20 to 70
1911
413
3706
800
PF4000-30
34
2,3
98 to 324
20 to 70
1911
413
1911
413
PF4200-10
34
2,3
98 to 324
20 to 70
1911
413
1911
413
PF4300-11
31
1,5
–
–
927
200
927
200
PF6000
34
2,3
98 to 324
20 to 70
1911
413
1911
413
Mechanical Variable Delivery Pumps:
PV4000
34
2,3
98 to 324
20 to 70
1911
413
1911
413
PV6000
34
2,3
98 to 324
20 to 70
1911
413
1911
413
Hydraulic Variable Delivery Pumps:
PV6000
34
2,3
98 to 324
20 to 70
1911
413
1911
413
➀
Fluid conditions outside the “Optimum” range may result in reduced output, requiring
pressurized inlet conditions. Contact the sales department.
➁
Models with special mounting. Refer to "Bulletin PES".
Fluid Guidelines
Contact the sales department when operating with low-
lubricity or non-petroleum based fluids, or beyond the
optimum fluid viscosity range.
IMPORTANT: Refer to “Fluid Recommendations” below.
Port/Fitting Configurations
1. Dynex pumps are available with outlet ports suitable for
use at various pressure ranges. Refer to page 7 for port
descriptions.
2. Contact the fitting manufacturer to ensure the selected
fittings are rated for the maximum pump operating pressure.
Minimum Filtration Levels
1. Pump inlet: 150 µ nominal;
Pressure or return line: 25 µ nominal.
2. While finer filtration levels than these are desirable and
will result in longer component life, restricting flow to the
pump inlet should be avoided. Minimum recommended
inlet conditions must be maintained.
Pump Mounting
1. Mounting with shaft horizontal and inlet vertically up is
preferred. Vertical mounting with shaft up is possible,
but special steps must be followed to bleed air from
housing.
IMPORTANT: Refer to "Air Bleed Procedure" on page 3.
2. Direct drive is recommended.
WARNING: Side loading of the pump shaft, as with an
unsupported pulley/belt drive system, will void the war-
ranty.
3. Connect the pump to the motor drive with a flexible cou-
pling. Maintain angular and radial alignment within the
coupling manufacturer's specifications for your application.
Dynex recommends that the shaft alignment be within
0.005 inch (0,13 mm) TIR. If a rigid coupling must be
used, alignment must be within 0.002 inch (0,05 mm) TIR.
4. The coupling half on the pump shaft must be locked on
the key with a set screw, such that it can not shift and
contact the end face of the pump when operating.
OPERATING RECOMMENDATIONS
Pump Rotation
1.
Variable delivery models with hydraulic volume control
and all fixed displacement models allow bi-directional
shaft rotation, providing constant direction of output
flow regardless of the direction of drive shaft rotation.
2. Variable delivery models with mechanical volume control
(PV4000 Series and Pressure Compensated PV4000 and
PV6000 Series) are unidirectional. The direction of rota-
tion is determined viewed from shaft end and must be
specified when ordering. A plate designating rotation is
mounted on the edge of the mounting flange, adjacent to
the inlet port. Refer to FIGURE 1 on page 1.
2
