Danfoss 51 Series Service Manual

General specifications
Most specifications for Series 51 and 51-1 motors are listed on these pages. For definitions of the various
specifications, see 520L0440 Series 51 Technical Information Manual.
Not all hardware options are available for all configurations. Consult the Series 51 Model Code Supplement
or price book for more information.
Basic requirements
•
Motor type: Axial piston motor with variable displacement bent-axis design
•
Direction of rotation: Clockwise and counter-clockwise (bi-directional)
•
Installation position: Discretionary (the housing must always be filled with hydraulic fluid)
•
Other system requirements: Independent braking system, circuit overpressure protection, suitable
reservoir
Technical data includes dimension and frame size for displacement, case and system pressure, speed, and
torque. These tables illustrate each facet.
Technical data
Frame size
Dimension 60 80 110 160 250
Maximum displacement Vg
max
cm³
[in³]
60
[3.66]
80.7
[4.92]
109.9
[6.71]
160.9
[9.82]
250
[15.26]
Minimum displacement Vg
min
cm³
[in³]
12
[0.73]
16.1
[0.98]
22
[1.34]
32.2
[1.96]
50
[3.05]
Rated flow Q l/min
[gal/min]
216
[57]
250
[66]
308
[81]
402
[106]
550
[145]
Maximum corner power P corner
max.
kW
[hp]
336
[450]
403
[540]
492
[660]
644
[864]
850
[1140]
Weight with control Hz m kg
lb
28
[62]
32
[71]
44
[97]
56
[123]
86
[190
Mass moment of inertia of the internal rotating
parts
kg•m
2
slug•ft
2
0.0046
[0.1092]
0.0071
[0.1685]
0.0128
[0.3037]
0.0234
[0.5553]
0.048
[1.158]
Type of mounting Four (4) bolt flange, SAE or DIN flange configuration
Two (2) bolt flange cartridge motor configuration
Pipe connections Main pressure ports: SAE flange
Remaining ports: SAE straight-thread O-ring boss
Controls Two-position, proportional (Series 51), hydraulic or electric, pressure compensator, w/wo override,
w/wo brake pressure defeat
Displacement limiter All Series 51 motors incorporate mechanical minimum and maximum displacement limiters
Shaft configuration Splined ANSI or DIN shaft
Case pressure
bar psi
Rated pressure 3 44
Maximum pressure (cold start) 5 73
Minimum pressure 1 15
Service Manual
Series 51 and 51-1 Motors
Technical specifications
©
Danfoss | March 2016 11008567 | AX00000013en-US0202 | 21

Danfoss 51 Series Specifications

General

Brand	Danfoss
Model	51 Series
Category	Engine
Language	English