Overhung load example
First stage
Second stage
Third
stage
P108 511E
L1
L2
L3
F2
F1
F3
Estimated maximum and rated acceleration factors for some typical applications are shown in the table
below.
Estimating overhung load moments
Based on SI units
W = Mass of pump kg
L = Distance from mounting f ange
to pump center of gravity
(refer to Installation drawings section)
M
R
= g • G
R
(W
1
L
1
+ W
2
L
2
+ ... + W
n
L
n
)
M
S
= g • G
S
(W
1
L
1
+ W
2
L
2
+ ... + W
n
L
n
)
Where:
M
R
= Rated load moment N•m
M
S
= Shock load moment N•m
g = Gravity 9.81 m/s
2
G
R
= Calculation factor for rated (vibratory) acceleration (G’s)*
G
S
= Calculation factor for maximum shock acceleration (G’s)*
* This factor depends on the application (see next page).
M
R
= G
R
(W
1
L
1
+ W
2
L
2
+ ... + W
n
L
n
)
M
S
= G
S
(W
1
L
1
+ W
2
L
2
+ ... + W
n
L
n
)
Based on US units
W = Weight of pump [lb]
L = Distance from mounting f ange [in]
to pump center of gravity
Where:
M
R
= Rated load moment N•m
M
S
= Shock load moment N•m
Use these values for a rough load estimation in the absence of specific data.
Typical G loads for various applications
Application
Calculation factor
Rated (vibratory)
acceleration G
R
Maximum (shock)
acceleration G
S
Skid Steer Loader
8
15-20
Trencher (rubber tires)
3
8
Asphalt Paver
2
6
Windrower
2
5
Aerial Lift
1.5
4
Turf Care Vehicle
1.5
4
Vibratory Roller
6
10
T000 165E
Technical Information
Series 90 Axial Piston Pumps
System Design Parameters
520L0603 • Rev 0804 • March 2016
19
