Danfoss Series 90 Axial Piston Motors User guide
Technical Information
Series 90
Axial Piston Motors
www.danfoss.com
Technical Information
Series 90 Axial Piston Motors
Revision history Table of revisions
Date Changed Rev
November 2021 Fixed Endcap Ports in MMC, adjusted revision numbers with DAM Hub 0711
July 2021 Updated operating parameters 0608
June 2021 Updated Master Model Code, Changed document number from 'BC00000017' to
'BC152886483265'
July 2019 Ffixed data 90K75 Cart. and SAE mount. 0606
January 2017 edits to graph and table on page 17 0605
July 2016 fix drawing on page 27 0604
November 2015 fixx drawing on page 30 0603
March 2014 connector corrections on page 18 FB
February 2014 Danfoss Layout FA
November 2013 remove variable motors information EA
November 2012 various updates DC
September 2008 flange to shaft length dimension should be [5.15 ±0.001] DB
April 2007 Remove allowable shaft loading data - consult factory DA
March 2004 Fourth edition D
0607
2 | © Danfoss | November 2021 BC152886483265en-000711
Technical Information
Series 90 Axial Piston Motors
Contents
General Description
Series 90 Family of Pumps and Motors.....................................................................................................................................4
Fixed Displacement Motor, SAE Mount....................................................................................................................................5
Fixed Displacement Motor, Cartridge Mount........................................................................................................................ 6
Series 90 Pictorial Circuit Diagram............................................................................................................................................. 7
System Schematic............................................................................................................................................................................ 7
Technical Specifications
Overview..............................................................................................................................................................................................8
Features and Options......................................................................................................................................................................8
Specifications.....................................................................................................................................................................................8
Operating Parameters.....................................................................................................................................................................8
Fluid Specification............................................................................................................................................................................9
Operating Parameters
Input Speed......................................................................................................................................................................................10
Independent Braking System...............................................................................................................................................10
System Pressure..............................................................................................................................................................................10
Case Pressure...................................................................................................................................................................................11
Temperature.................................................................................................................................................................................... 11
Viscosity.............................................................................................................................................................................................11
System Design Parameters
Fluid and Filtration........................................................................................................................................................................ 12
Independent Braking System....................................................................................................................................................12
Reservoir............................................................................................................................................................................................12
Overpressure Protection............................................................................................................................................................. 13
Case Drain.........................................................................................................................................................................................13
Sizing Equations............................................................................................................................................................................. 13
Formulas...................................................................................................................................................................................... 13
External Shaft Loading and Bearing Life................................................................................................................................13
Applications with external shaft loads..............................................................................................................................14
Master Model Code
Series 90 Motors Master Model Code Breakdown............................................................................................................. 16
S90 Type, Size Endcap Options.................................................................................................................................................16
S90 Shaft and Loop Flushing System......................................................................................................................................16
S90 Special Hardware and Loop Flushing Valve.................................................................................................................17
Features and Options
Loop Flushing..................................................................................................................................................................................18
Speed Sensor...................................................................................................................................................................................19
Shaft Options...................................................................................................................................................................................20
Installation Drawings
90K55 Fixed Motor Cartridge Mount...................................................................................................................................... 22
90M55 Fixed Motor SAE Mount................................................................................................................................................24
90K75 Fixed Motor Cartridge Mount...................................................................................................................................... 26
90M75 Fixed Motor SAE Mount................................................................................................................................................28
90M100 Fixed Motor SAE Mount..............................................................................................................................................30
90M130 Fixed Motor SAE Mount..............................................................................................................................................32
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Technical Information
Series 90 Axial Piston Motors
General Description
Series 90 Family of Pumps and Motors
Series 90 hydrostatic pumps and motors can be applied together or combined with other products in a
system to transfer and control hydraulic power. They are intended for closed circuit applications.
Series 90 variable displacement pumps are compact, high power density units. All models utilize the
parallel axial piston/slipper concept in conjunction with a tiltable swashplate to vary the pump's
displacement. Reversing the angle of the swashplate reverses the flow of oil from the pump and thus
reverses the direction of rotation of the motor output.
Series 90 pumps include an integral charge pump to provide system replenishing and cooling oil flow, as
well as control fluid flow. They also feature a range of auxiliary mounting pads to accept auxiliary
hydraulic pumps for use in complementary hydraulic systems. A complete family of control options is
available to suit a variety of control systems (mechanical, hydraulic, electric).
Series 90 motors also use the parallel axial piston/slipper design in conjunction with a fixed swashplate.
They can intake/discharge fluid through either port; they are bidirectional. They also include an optional
loop flushing feature that provides additional cooling and cleaning of fluid in the working loop.
Series 90 – advanced technology today
•
Seven sizes of variable displacement pumps
•
Four sizes of fixed displacement motors
•
SAE and cartridge mount configurations
•
Efficient axial piston design
•
Proven reliability and performance
•
Compact, lightweight
•
Worldwide sales and service
•
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P100 490E
Loop flushing valve
Valve plate Piston
Roller bearing
Output shaft
Fixed swashplate
Cylinder block
Model-No./Ident-No.
Model Code
Serial-No.
Made in Germany
Place of Manufactur
e
Model
Number
Serial
Number
Model
Code
A - 00 - 13 - 67890
501829
90M100 NC 0 N 7 N 0 C7
W 00 CBA 00 00 83
Technical Information
Series 90 Axial Piston Motors
General Description
Fixed Displacement Motor, SAE Mount
Cross section
Name plate
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Danfoss | November 2021 BC152886483265en-000711 | 5
P104 253E
Charge relief valve
Loop flushing
valve
Cylinder block
Piston
Roller bear ing
Output
shaft
Valve plate
Swashplate
Model-No./Ident-No.
Model Code
Serial-No.
Place of Manufactur
e
Model
Number
Serial
Number
Model
Code
A - 00 - 13 - 67890
501829
90M100 NC 0 N 7 N 0 C7
W 00 CBA 00 00 83
Made in China
Technical Information
Series 90 Axial Piston Motors
General Description
Fixed Displacement Motor, Cartridge Mount
Cross section
Name plate
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Pump Motor
Working loop (low pressure)
Control fluid
Suction line
Case drain fluid
Working loop (high pressure)
Motor swashplate
Loop flushing valve
Displacement control valve
Heat exchanger bypass valve
Reservoir
Vacuum gauge
Purge relief valve
Fixed displacement moto r
Output shaft
Multi-function valve
Charge pump
To
pump
case
Servo
pressure
relief valves
Servo control cylinder
Pump swashplate
Input shaft
Reversible variable
displacement pump
Servo control cylinder
Heat exchanger
Multi-function valve
Charge pressure relief valve
Orificed check
valve
Control handle
P102 000
M
BB
L2
M2
M1
M4
M5
M3
A A
S
L2 M1
M2
L1
M3
P104 286E
Technical Information
Series 90 Axial Piston Motors
General Description
Series 90 Pictorial Circuit Diagram
The circuit diagram shows a hydrostatic transmission using a Series 90 axial piston variable displacement
pump and a Series 90 fixed displacement motor.
System Schematic
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Technical Information
Series 90 Axial Piston Motors
Technical Specifications
Overview
Specifications for the Series 90 motors are listed here for quick reference. For definitions and additional
information, see Operating Parameters on page 8.
Features and Options
Motor type In-line, axial piston, closed loop, positive displacement motors
Direction of rotation Bi-directional, see outline drawings for rotation vs. flow direction information
Installation position Discretionary: Housing must be filled with hydraulic fluid
Other system requirements Independent braking system, overpressure protection, suitable reservoir, proper
Parameter 055 MF 075 MF 100 MF 130 MF
Types of mounting (SAE flange size
per SAE J744)
Port connections Twin, axial Twin, axial Twin Twin
Output shaft options Spline, tapered,
Control options — — — —
Loop flushing • • • •
Speed sensor o o o o
filtration
SAE C, cartridge SAE C, cartridge SAE C SAE D
straight
Spline, tapered,
straight
Spline, tapered,
straight
Spline
Specifications
Operating Parameters
• Standard
o Optional
— Not available / not applicable
Parameter 055 MF 075 MF 100 MF 130 MF
Swashplate Fixed Fixed Fixed Fixed
Max. displacement
cm³/rev [in³/rev]
Maximum corner power kW [hp] 187 [251] 237 [318] 292 [392] 354 [475]
Theoretical torque
N•m/bar [lbf•in/1000 psi]
Weight
kg [lb]
Mass moment of inertia
kg•m² [slug•ft²]
Parameter Unit 055 MF 075 MF 100 MF 130 MF
Speed limits Continuous (max. disp.) min
SAE 22 [49] 26 [57] 34 [74] 45 [99]
Cartridge 26 [57] 33 [72] — —
Maximum (max. disp.) 4250 3950 3650 3400
Continuous (min. disp.) — — — —
Maximum (min. disp.) — — — —
55 [3.35] 75 [4.57] 100 [6.10] 130 [7.90]
0.88
[530]
0.0060 [0.0044] 0.0096 [0.0071] 0.0150 [0.0111] 0.0230 [0.0170]
1.19
[730]
(rpm)
1.59
[970]
-1
3900 3600 3300 3100
2.07
[1260]
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Technical Information
Series 90 Axial Piston Motors
Technical Specifications
Parameter Unit 055 MF 075 MF 100 MF 130 MF
System pressure Maximum working pressure bar
Flow ratings Rated (max. disp., rated speed) l/min
Case pressure Maximum working pressure bar
Fluid Specification
Viscosity
Intermittent
Minimum
Recommended range
Maximum
1)
Intermittent = Short term t < 1 min per incident and not exceeding 2 % of duty cycle based load-life.
Maximum pressure 480 [6960]
[psi]
Maximum low loop 45 [650]
Minimum low loop pressure 10 [145]
Maximum (max. disp., max.
[US gal/min]
speed)
Maximum (cold start) 5 [73]
1)
[psi]
5 mm2/s [42 SUS]
7 mm2/s [49 SUS]
12 – 80 mm2/s [66 – 370 SUS]
1600 mm2/s [7500 SUS]
450 [6525]
215 [57] 270 [71] 330 [87] 403 [106]
234 [62] 296 [78] 365 [96] 442 [117]
3 [44]
Temperature
Minimum
1)
Rated
Recommended range
2)
Maximum Intermittent
1)
Cold start = Short term t > 3 min, p ≤ 50 bar [725 psi], n ≤ 1000 min-1 (rpm).
2)
At the hottest point, normally case drain port.
-40°C [-40°F]
104°C [220°F]
60 – 85°C [140 – 185°F]
115°C [240°F]
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W
Technical Information
Series 90 Axial Piston Motors
Operating Parameters
Input Speed
Minimum
speed
Rated speed is the highest input speed recommended at full power condition. Operating at or
Maximum
speed
During hydraulic braking and downhill conditions, the prime mover must be capable of providing
sufficient braking torque in order to avoid pump over speed. This is especially important to consider for
turbo-charged and Tier 4 engines.
For more information please see Pressure and Speed Limits, BC152886484313, when determining speed
limits for a particular application.
Independent Braking System
is the lowest input speed recommended during engine idle condition. Operating below
minimum speed limits the pump’s ability to maintain adequate flow for lubrication and
power transmission.
below this speed should yield satisfactory product life.
Operating conditions between rated and maximum speed should be restricted to less
than full power and to limited periods of time.
is the highest operating speed permitted. Exceeding maximum speed reduces product
life and can cause loss of hydrostatic power and braking capacity. For most drive
systems, maximum unit speed occurs during downhill braking or negative power
conditions.
Warning
Never exceed the maximum speed limit under any operating conditions.
System Pressure
Unintended vehicle or machine movement hazard. Exceeding maximum speed may cause a loss of
hydrostatic drive line power and braking capacity.
Machine manufacturer is responsible to provide a braking system, redundant to the hydrostatic
transmission, sufficient to stop and hold the vehicle or machine in the event of hydrostatic drive power
loss. The braking system must also be sufficient to hold the machine in place when full power is applied.
Hydraulic unit life depends on the speed and normal operating — or weighted average — pressure that
can only be determined from a duty cycle analysis.
System pressure is the differential pressure between high pressure system ports. It is the dominant
operating variable affecting hydraulic unit life. High system pressure, which results
from high load, reduces expected life.
Application
pressure
Maximum
working
pressure
is the high pressure relief or pressure limiter setting normally defined within the
order code of the pump. This is the applied system pressure at which the drive line
generates the maximum calculated pull or torque in the application.
is the highest recommended application pressure and is not intended to be a
continuous pressure. Propel systems with application pressures at, or below this
pressure should yield satisfactory unit life given proper component sizing.
Application pressures above maximum working pressure will only be considered
with duty cycle analysis and factory approval.
Pressure spikes are normal and must be considered when reviewing maximum
working pressure.
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Technical Information
Series 90 Axial Piston Motors
Operating Parameters
Case Pressure
Temperature
Maximum
pressure
Minimum low
loop pressure
Under normal operating conditions, the rated case pressure must not be exceeded. During cold start case
pressure must be kept below maximum intermittent case pressure. Size drain plumbing accordingly.
The auxiliary pad cavity of axial pumps configured without integral charge pumps is referenced to case
pressure. Units with integral charge pumps have auxiliary mounting pad cavities referenced to charge
inlet (vacuum).
Possible component damage or leakage.
Operation with case pressure in excess of stated limits may damage seals, gaskets, and/or housings,
causing external leakage. Performance may also be affected since charge and system pressure are
additive to case pressure.
The high temperature limits apply at the hottest point in the transmission, which is normally the motor
case drain. The system should generally be run at or below the quoted rated temperature.
The maximum intermittent temperature is based on material properties and should never be
exceeded.
Cold oil will generally not affect the durability of the transmission components, but it may affect the
ability of oil to flow and transmit power; therefore temperatures should remain 16 °C [30 °F] above the
pour point of the hydraulic fluid.
The minimum temperature relates to the physical properties of component materials.
Size heat exchangers to keep the fluid within these limits. Danfoss recommends testing to verify that
these temperature limits are not exceeded.
is the highest intermittent pressure allowed under any circumstances. Applications
with applied pressures between rated and maximum require factory approval with
complete application, duty cycle, and life expectancy analysis.
must be maintained under all operating conditions to avoid cavitation.
All pressure limits are differential pressures referenced to low loop (charge) pressure.
Subtract low loop pressure from gauge readings to compute the differential.
Viscosity
For maximum efficiency and bearing life, ensure the fluid viscosity remains in the recommended range.
The minimum viscosity should be encountered only during brief occasions of maximum ambient
temperature and severe duty cycle operation.
The maximum viscosity should be encountered only at cold start.
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