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	0607
			'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

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

© Danfoss | November 2021

BC152886483265en-000711 | 3

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

4 | © Danfoss | November 2021

BC152886483265en-000711

Technical Information

Series 90 Axial Piston Motors

General Description

Fixed Displacement Motor, SAE Mount

Cross section

Loop flushing valve

Valve plate

Piston

Roller bearing

Output shaft

P100 490E

Fixed swashplate

Cylinder block

Name plate

			Model-No./Ident-No.	501829	Model
			Model Code 90M100 NC 0 N 7 N 0 C7		Number
Model			W 00 CBA 00 00 83
Code			Serial-No.	A - 00 - 13 - 67890	Serial

Number

Made in Germany

Place of Manufacture

© Danfoss | November 2021

BC152886483265en-000711 | 5

Technical Information

Series 90 Axial Piston Motors

General Description

Fixed Displacement Motor, Cartridge Mount

Cross section

Cylinder block

Charge relief valve

bearing

Loop flushing

valve Output shaft

Valve plate

P104 253E

Swashpla te

Name plate

			Model-No./Ident-No.	501829	Model
			Model Code 90M100 NC 0 N 7 N 0 C7		Number
Model			W 00 CBA 00 00 83
Code			Serial-No.	A - 00 - 13 - 67890	Serial

Number

Made in China

Place of Manufacture

6 | © Danfoss | November 2021

BC152886483265en-000711

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.

Control handle	Displacement control valve
		Heat exchanger bypass valve
		Orificed heck	Reservoi
				Vacuum gauge
		valve
					valve	P102 000
Reversiblevariable	Servo control cylinder				Fixed displacement motor
displacement pump
			To
			pump
		Servo	case
		pressure
		relief valves
		Charge pump
Input shaft		Multi-function valve				Output shaft
				Motor swashplate
Pump swashplate	Servo control cylinder			Loop flushing valve
		Pump			Motor
Working loop (high pressure)		Working loop (low pressur e)	Suction line	Control fluid	Case drain fluid

System Schematic
	M3		L2	M3	M1
		A	A
M1
M4
M5
M
M2
		B	B
S		L2	L1		M2	P104 286E
© Danfoss | November 2021					BC152886483265en-000711 | 7

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
	filtration
Parameter		055 MF	075 MF	100 MF	130 MF
Types of mounting (SAE flange size		SAE C, cartridge	SAE C, cartridge	SAE C	SAE D
per SAE J744)
Port connections		Twin, axial	Twin, axial	Twin	Twin
Output shaft options		Spline, tapered,	Spline, tapered,	Spline, tapered,	Spline
		straight	straight	straight
Control options		—	—	—	—
Loop flushing		•	•	•	•
Speed sensor		o	o	o	o

• Standard

o Optional

— Not available / not applicable

Specifications

Parameter			055 MF		075 MF		100 MF	130 MF
Swashplate			Fixed		Fixed		Fixed	Fixed
Max. displacement			55	[3.35]	75	[4.57]	100 [6.10]	130 [7.90]
cm³/rev [in³/rev]
Maximum corner power kW [hp]			187 [251]		237 [318]		292 [392]	354 [475]
Theoretical torque			0.88		1.19		1.59	2.07
N•m/bar [lbf•in/1000 psi]			[530]		[730]		[970]	[1260]
Weight		SAE	22	[49]	26	[57]	34 [74]	45 [99]
kg [lb]
		Cartridge	26	[57]	33	[72]	—	—
Mass moment of inertia			0.0060 [0.0044]		0.0096 [0.0071]		0.0150 [0.0111]	0.0230 [0.0170]
kg•m² [slug•ft²]

Operating Parameters

Parameter		Unit	055 MF	075 MF	100 MF	130 MF
Speed limits	Continuous (max. disp.)	min-1	3900	3600	3300	3100
		(rpm)
	Maximum (max. disp.)		4250	3950	3650	3400
	Continuous (min. disp.)		—	—	—	—
	Maximum (min. disp.)		—	—	—	—

8 | © Danfoss | November 2021

BC152886483265en-000711

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	450	[6525]
		[psi]
	Maximum pressure		480	[6960]
	Maximum low loop		45 [650]
	Minimum low loop pressure		10 [145]
Flow ratings	Rated (max. disp., rated speed)	l/min	215	[57]	270 [71]	330 [87]	403 [106]
		[US gal/min]
	Maximum (max. disp., max.		234	[62]	296 [78]	365 [96]	442 [117]
	speed)
Case pressure	Maximum working pressure	bar	3 [44]
		[psi]
	Maximum (cold start)		5 [73]

Fluid Specification

Viscosity

Intermittent1)	5 mm2/s [42 SUS]
Minimum	7 mm2/s [49 SUS]
Recommended range	12 – 80 mm2/s [66 – 370 SUS]
Maximum	1600 mm2/s [7500 SUS]

1) Intermittent = Short term t < 1 min per incident and not exceeding 2 % of duty cycle based load-life.

Temperature

Minimum 1)	-40°C [-40°F]
Rated	104°C [220°F]
Recommended range2)	60 – 85°C [140 – 185°F]
Maximum Intermittent	115°C [240°F]

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.

© Danfoss | November 2021

BC152886483265en-000711 | 9

Technical Information

Series 90 Axial Piston Motors

Operating Parameters

Input Speed

Minimum	is the lowest input speed recommended during engine idle condition. Operating below
speed	minimum speed limits the pump’s ability to maintain adequate flow for lubrication and
	power transmission.
Rated speed	is the highest input speed recommended at full power condition. Operating at or
	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.
Maximum	is the highest operating speed permitted. Exceeding maximum speed reduces product
speed	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.
	W Warning
	Never exceed the maximum speed limit under any operating conditions.

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

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.

System Pressure

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	is the high pressure relief or pressure limiter setting normally defined within the
pressure	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.
Maximum	is the highest recommended application pressure and is not intended to be a
working	continuous pressure. Propel systems with application pressures at, or below this
pressure	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.

10 | © Danfoss | November 2021

BC152886483265en-000711

Technical Information

Series 90 Axial Piston Motors

Operating Parameters

	Maximum	is the highest intermittent pressure allowed under any circumstances. Applications
	pressure	with applied pressures between rated and maximum require factory approval with
		complete application, duty cycle, and life expectancy analysis.
	Minimum low	must be maintained under all operating conditions to avoid cavitation.
	loop pressure
		All pressure limits are differential pressures referenced to low loop (charge) pressure.
		Subtract low loop pressure from gauge readings to compute the differential.

Case 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.

Temperature

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.

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.

© Danfoss | November 2021

BC152886483265en-000711 | 11