Danfoss Series 40 Axial Piston Motors Technical Information

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Technical Information

Series 40 Axial Piston Motors

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Technical Information

Series 40 Axial Piston Motors

Revision history Table of revisions

Date Changed Rev

February 2017 Corrected document formatting 0703

October 2016 Minor updates 0702

January 2014 Danfoss layout GA

September 2013 add system pressure information FG

June 2013 add anti-cavitation option FF

April 2011 correct system pressure gauge port 7/16-20 FE

August 2010 new back page FD

March 2010 minor edits FC

November 2007 correction to maximum torque rating 15 and 19 tooth FB

April 2007 Revised dimensions for straight keyed shaft FA

September-2006 Corrections in model code examples F

September-2005 Major Revision E

2 | © Danfoss | February 2017 520L0636 | 0703

Technical Information

Series 40 Axial Piston Motors

General description

Basic design........................................................................................................................................................................................5

Key features........................................................................................................................................................................................ 5

Cross sections.................................................................................................................................................................................... 6

System circuit diagram...................................................................................................................................................................7

M46 motor schematic ....................................................................................................................................................................7

Technical Specifications

Overview..............................................................................................................................................................................................8

General.................................................................................................................................................................................................8

Features and options...................................................................................................................................................................... 8

Specifications.....................................................................................................................................................................................8

Operating parameters.................................................................................................................................................................... 8

Fluid specifications.......................................................................................................................................................................... 9

Hydraulic unit life............................................................................................................................................................................. 9

Performance.......................................................................................................................................................................................9

Bearing life and external shaft loading ................................................................................................................................. 10

Operating Parameters

Fluids.................................................................................................................................................................................................. 12

Viscosity.............................................................................................................................................................................................12

Temperature.................................................................................................................................................................................... 12

Case pressure...................................................................................................................................................................................12

System Pressure..............................................................................................................................................................................13

Speed ratings...................................................................................................................................................................................13

System design parameters

Sizing equations.............................................................................................................................................................................14

Filtration............................................................................................................................................................................................ 14

Bypass valve.....................................................................................................................................................................................14

Loop flushing valve.......................................................................................................................................................................15

Charge Flow.....................................................................................................................................................................................16

Charge Pressure/Open Circuit Operation............................................................................................................................. 16

Redundant braking system requirement..............................................................................................................................16

Reservoir............................................................................................................................................................................................16

Overpressure protection............................................................................................................................................................. 17

Product coding

Revised model code......................................................................................................................................................................18

Model code modules....................................................................................................................................................................18

Fixed motor.................................................................................................................................................................................18

Variable motor...........................................................................................................................................................................18

Features and options

Anti-Cavitation Valve Option.....................................................................................................................................................20

Displacement limiters...................................................................................................................................................................20

Speed sensor option.....................................................................................................................................................................21

Pulse pickup and connector.......................................................................................................................................................23

Shaft options....................................................................................................................................................................................23

Through-shaft options................................................................................................................................................................. 24

Shaft options

M25 MF.............................................................................................................................................................................................. 25

M35/44 MF........................................................................................................................................................................................25

M35/44 MV....................................................................................................................................................................................... 26

M46 MV..............................................................................................................................................................................................27

Control options

Direct displacement control (DDC)......................................................................................................................................... 28

External Control Handle Requirements............................................................................................................................28

Two-position hydraulic control.................................................................................................................................................29

Installation drawings

Danfoss | February 2017 520L0636 | 0703 | 3

Technical Information

Series 40 Axial Piston Motors

Contents

M25 MF: axial ports, twin ports, loop flushing, speed sensor........................................................................................30

M25 MF: mounting flange.......................................................................................................................................................... 32

M35/M44 MF: mounting flange................................................................................................................................................32

M35/M44 MF: axial ports, twin ports, loop flushing, speed sensor..............................................................................33

M35/M44 MF: radial ports, twin ports, anti-cavitation valve..........................................................................................34

M35/M44 MF: side ports, through shaft.................................................................................................................................35

M35/M44 MV: twin ports.............................................................................................................................................................36

M35/M44 MV: mounting flange, trunnion control............................................................................................................ 37

M46 MV: side ports, loop flushing............................................................................................................................................37

M46 MV: axial ports, loop flushing...........................................................................................................................................39

M46 MV: side ports, thru shaft twin ports, loop flushing.................................................................................................40

M46 MV: mounting flange..........................................................................................................................................................41

M46 MV: control ports..................................................................................................................................................................42

Schematics

Motor Schematics.......................................................................................................................................................................... 43

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Technical Information

Series 40 Axial Piston Motors

General description

Basic design

Series 40 is a family of hydrostatic pumps and motors for medium power applications with maximum loads of 345 bar [5000 psi]. These pumps and motors can be applied together or combined with other products in a system to transfer and control hydraulic power.

Series 40 transmissions (pump plus motor) provide an infinitely variable speed range between zero and maximum in both forward and reverse modes of operation. The pumps and motors each come in four frame sizes: M25, M35, M44, and M46.

Series 40 pumps are compact, high power density units. All models use 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 fluid from the pump, reversing the direction of rotation of the motor output.

Series 40 M35, M44, and M46 pumps may include an integral charge pump to provide system replenishing and cooling fluid flow, as well as servo control fluid flow on M46 pumps. M25 pumps are designed to receive charge flow from an auxiliary circuit or from a gear pump mounted on the auxiliary mounting pad. Series 40 pumps feature a range of auxiliary mounting pads to accept auxiliary hydraulic pumps for use in complementary hydraulic systems.

Series 40 M46 pumps offer proportional controls with either manual, hydraulic, or electronic actuation. An electric three-position control is also available. The M25, M35, and M44 pumps include a trunnion style direct displacement control.

Series 40 motors also use the parallel axial piston / slipper design in conjunction with a fixed or tiltable swashplate. The family includes M25, M35, M44 fixed motor units and M35, M44, M46 variable motor units.

The M35 and M44 variable motors feature a trunnion style swashplate and direct displacement control. The M46 variable motors use a cradle swashplate design and a two-position hydraulic servo control.

Key features

3 sizes of variable displacement motors

•

3 sizes of fixed displacement motors

•

Efficient axial piston design

•

Complete family of control systems

•

Proven reliability and performance

•

Compact, lightweight

•

Worldwide sales and service

•

Danfoss | February 2017 520L0636 | 0703 | 5

Swash plate

Piston

Bearing

Cylinder

Displacement limiter

Cylinder block

Piston

Output shaft

Lip seal

Bearing

Cylinder block

Piston

Output shaft

Lip seal

Bearing

Cylinder block

Piston

Output shaft

Lip seal

Bearing

Servo piston

P101738E

Output shaft

Lip seal

Swash plate

Technical Information

Series 40 Axial Piston Motors

General description

Cross sections

M35/M44 variable motor (MV), M25 fixed motor (MF), M35/M44 fixed motor (MF), M46 variable motor (MV) (SAE flange)

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Input shaft

Suction flow

Servo pressure High pressure Case flow

Charge pressure

Output shaft

Cylinder block assembly

Filter

Charge pump

Reservoir

Fixed displacement motor

Cylinder block

assembly

Heat exchanger

Check valves w/ high pressure relief valve

Variable displacement pump

Heat exchanger bypass

Charge relief valve

Displacement control valve

Control handle

Bypass valve

Loop flushing module

P100586E

P101869

Technical Information

Series 40 Axial Piston Motors

General description

System circuit diagram

A Series 40 M35 fixed motor is shown in a hydraulic circuit with a Series 40 M46 variable pump. A loop flushing module is included on the motor. The circuit features suction filtration and heat exchanger.

M46 motor schematic

The system ports (A and B) connect to the high pressure work lines. The motor receives pressurized fluid in its inlet port and discharges de-energized fluid through the outlet port. Either port can act as inlet or outlet; flow is bidirectional. System port pressure is gauged through ports M1 and M2. The motor has two case drains (L1 and L2). The motor may include loop flushing. Loop flushing provides additional cooling

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and filtration capacity.

Technical Information

Series 40 Axial Piston Motors

Technical Specifications

Overview

Specifications and operating parameters are shown below. Not all hardware options are available for all configurations. For additional information, see Operating Parameters on page 12, System design

parameters on page 14, Product coding on page 18, Features and options on page 20 and Control options on page 28.

General

Product Line Series 40 motors Product Type In-line, axial piston, fixed and variable, positive

Direction of Rotation Clockwise (CW) and counterclockwise (CCW) Installation Position Discretionary, the housing must be filled with hydraulic

Filtration Configuration Suction or charge pressure filtration Other System Requirements Independent braking system, circuit overpressure

displacement motors

fluid before operation

protection, suitable reservoir and heat exchanger

Features and options

Model M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV Type of mounting Port connections Output shaft

options Control options Loop flushing Displacement

limiters Speed sensors

SAE B SAE B SAE B SAE B SAE B SAE B

Twin, Axial Side, Twin, Axial Side, Twin, Axial Twin Twin Side, Twin, Axial

Splined, Tapered Splined, Tapered,

Straight Key

- - - DDC DDC Hyd. 2-pos.

Option Option Option Option Option Option

- - - Option Option Option

Option Option Option - - Option

Splined, Tapered, Straight Key

Splined Splined Splined, Tapered

Specifications

Model Unit M25MF M35 MF M44 MF M35MV M44MV M46 MV

Model configuration - Fixed Fixed Fixed Variable Variable Variable Type of mounting - SAE B SAE B SAE B SAE B SAE B SAE B Displacement cm3/rev [in3/rev] 25 [1.50] 35 [2.14] 44 [2.65] 35 [2.14] 44 [2.65] 46 [2.80] Weight kg [lbf] 11 [26] 11 [26] 11 [26] 21 [47] 21 [47] 23 [51] Mass moment of inertia

kg•m2 [slug•ft2] 0.0018

[0.0013]

0.0033 [0.0024]

0.0032 [0.0023]

0.0033 [0.0024]

0.0032 [0.0023]

0.0050 [0.0037]

Operating parameters

Model M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV

Case pressure bar [psi] Maximum working 1.7 [25] Maximum 5.2 [75] Speed limits min-1[rpm] Rated @ max disp. 4000 3600 3300 3600 3300 4000

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100

Efficienc

y -

0 25 50 75 100

Speed - % of Rated Speed

Volumetric Efficiency - 170 bar [2500 psi]

Volumetric Efficiency - 345 bar [5000 psi]

Overall Efficiency - 170 bar [2500 psi]

Overall Efficiency - 345 bar [5000 psi]

P100 455E

Technical Information

Series 40 Axial Piston Motors

Technical Specifications

Model M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV

Maximum @ max. disp. 5000 4500 4100 4500 4100 4100 Rated @ min. disp. - - - 4200 3900 4500 Maximum @ min. disp. System pressure bar [psi] Maximum working 345 [5000] 380 [5511] 345 [5000] 380 [5511] 345 [5000] 345 [5000] Maximum 385 [5584] 415 [6019] 415 [6019] 415 [6019] 415 [6019] 385 [5584]

Fluid specifications

Ratings and data are based on operation with premium petroleum-based hydraulic fluids reftaining oxidation, rust, and foam inhibitors.

Parameter Unit Minimum reftinuous Maximum

Viscosity mm /sec (cSt)

Temperature °C [°F] -40 [-40] 82 [180] 104 [220] Cleanliness ISO 4406 Class 18/13 or better Filtration

efficiency

Hydraulic unit life

Hydraulic unit life is the life expectancy of the hydraulic components. Hydraulic unit life is a function of speed and system pressure; however, system pressure is the dominant operating variable affecting hydraulic unit life. High pressure, which results from high load, reduces expected life.

It is desirable to have a projected machine duty cycle with percentages of time at various loads and speeds. Danfoss calculates appropriate design pressure from this information. This method of selecting operating pressure is recommended whenever duty cycle information is available.

All pressure limits are differential pressures and assume normal charge pressure. Series 40 motors will meet satisfactory life expectancy if applied within the parameters specified in this bulletin. For more detailed information on hydraulic unit life see BLN9884 Pressure and Speed Limits.

Performance

This performance graph provides typical volumetric and overall efficiencies for Series 40 motors. These efficiencies apply for all Series 40 motors at maximum displacement.

Motor performance as a function of operating speed

- - - 5300 4850 5000

[SUS]

suction filtration β charge filtration β

7 [47] 12-60 [70-278] 1600 [7500]

=75 (β10≥1.5)

35-44

=75 (β10≥10)

15-20

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5000

4000

3000

2000

1000

System Pressur

0 25 50 75 100

Speed - % of Rated Speed

psi

345

270

210

140

bar

80%

85%

88%

89%

85%

88%

89%

P100 456E

Technical Information

Series 40 Axial Piston Motors

Technical Specifications

The performance map provides typical motor overall efficiencies at various operating parameters. These efficiencies apply for all Series 40 motors at maximum displacement.

Motor performance as a function of operating speed

Bearing life and external shaft loading

Bearing life is a function of speed, pressure and swashplate angle, plus any external loads. Other life factors include oil type and viscosity.

In vehicle propulsion drives with no external loads, where the speed, pressure, and swashplate angle are often changing, normal bearing ß10 (90% survival) life will exceed the hydraulic unit life.

In non-propel drives, such as conveyors or fan drives, the operating speed and pressure may be nearly constant leading to a distinctive duty cycle compared to that of a propulsion drive. In propel applications, Danfoss recommends a bearing life review.

Series 40 motors are designed with bearings that can accept some incidental external radial and thrust loads. However, any amount of external load will reduce the expected bearing life.

The allowable radial shaft loads are a function of the load position, the load orientation, and the operating pressures of the hydraulic unit. All external shaft loads have an effect on bearing life. In motor applications where external shaft loads cannot be avoided, the impact on bearing life can be minimized by orienting the load to the 180 degree position (see Direction of external shaft load, next page).

The recommended maximum radial load (Re) is based on an external moment (Me) and the distance (L) from the mounting flange to the load, (see table at below). The loads in the table reflect a worst case external load orientation (0 degrees), a continuously applied working pressure of 140 bar (2000 psi), 20 bar (285 psi) charge pressure, 1800 min-1(rpm), and a bearing life (ß10) of 2000 hours. Avoid thrust loads in either direction.

The recommended maximum allowable radial load is calculated as: Re = Me / L If continuously applied external radial loads exceed the recommended maximum allowable, or thrust

loads are known to occur, contact Danfoss for an evaluation of unit bearing life. Optional high capacity bearings are available.

Tapered output shafts or clamp-type couplings are recommended for applications where radial shaft side loads are present.

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P100 453E

0 Re

180 Re

90 Re 270 Re

Axis of swashplate

rotation

End vi

of shaft

P100 454E

Technical Information

Series 40 Axial Piston Motors

Technical Specifications

Shaft loading parameters

L Distance from mounting flange to point of load F

T Thrust load

Recommended maximum external shaft moments

Me N•m [lbf•in] 29 [255] 25 [225] 24 [215]

External shaft loads

Maximum radial side load Maximum external moment

Force of block (applies at center of gravity)

M25 M35/44 M46

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Direction of external shaft load

Technical Information

Series 40 Axial Piston Motors

Operating Parameters

Fluids

Ratings and performance data are based on operating with premium hydraulic fluids containing oxidation, rust, and foam inhibitors. These include premium turbine oils, API CD engine oils per SAE J183, M2C33F or G automatic transmission fluids (ATF), Dexron™ II (ATF) meeting Allison™ C-3 or Caterpillar T0‑2 requirements, and certain specialty agricultural tractor fluids. For more information on hydraulic fluid selection, see Danfoss publications: 520L0463, Hydraulic Fluids and Lubricants, Technical Information, and 520L465, Experience with Biodegradable Hydraulic Fluids, Technical Information.

Viscosity

Fluid viscosity limits

Condition mm2/s (cSt) SUS

Minimum 7 47 Continuous 12-60 70-278 Maximum 1600 7500

Maintain fluid viscosity within the continuous range for maximum efficiency and bearing life. Minimum viscosity should only occur during brief occasions of maximum ambient temperature and severe duty cycle operation. Maximum viscosity should only occur at cold start: Limit speeds until the system warms up. See Danfoss publication: 520L0463, Hydraulic Fluids and Lubricants, Technical Information.

™

Temperature

Case pressure

Maintain fluid temperature within the limits shown in the table. Minimum temperature relates to the physical properties of the component materials. Cold oil will not affect the durability of the motor components. However, it may affect the ability of the motor to transmit

power. Maximum temperature is based on material properties. Don't exceed it. Measure maximum temperature at the hottest point in the system. This is usually the case drain.

Ensure fluid temperature and viscosity limits are concurrently satisfied. Temperature limits

Temperature limits

Minimum (intermittent, cold start)

Continuous 82.2° C [180° F] Maximum 104.4° C [220° F]

- 40° C [- 40° F]

Maintain case pressure within the limits shown in the table. Ensure housing is kept filled with hydraulic fluid.

Case pressure limits

Maximum (continuous) 1.7 bar [25 psi] Intermittent (cold start) 5.2 bar [75 psi]

Warning

Operating outside of case pressure limits will damage the motor. To minimize this risk, use full size inlet and case drain plumbing, and limit line lengths.

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Technical Information

Series 40 Axial Piston Motors

Operating Parameters

System Pressure

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. Hydraulic unit life depends on the speed and normal operating, or weighted average, pressure that can only be determined from a duty cycle analysis.

Application 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 driveline generates the maximum calculated pull or torque in the application.

Maximum Working pressure is the highest recommended application pressure. Maximum working pressure 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.

Maximum pressure is the highest allowable application pressure under any circumstance. Application pressures above maximum working pressure will only be considered with duty cycle analysis and factory approval.

Minimum low loop pressure 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.

Speed ratings

The table, Operating parameters on page 8, gives rated and maximum speeds for each displacement. Not all displacements operate under the same speed limits. Definitions of these speed limits appear below.

Rated speed is the maximum recommended operating speed at full power condition. Operating at or below this speed should yield satisfactory product life. In vehicle propel applications, maximum motor speed during unloaded, on-road travel over level ground should not exceed this limit.

Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces motor life and can cause loss of hydrostatic power and braking capacity. Never exceed the maximum speed limit under any operating conditions.

Warning

Unintended vehicle or machine movement hazard

The loss of hydrostatic drive line power, in any mode of operation (forward, neutral, or reverse) may cause the system to lose hydrostatic braking capacity. You must 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.

Speed limits

Limit min-1(rpm) M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV

Rated at max. displ. 4000 3600 3300 3600 3300 4000 Maximum at max. displ. 5000 4500 4100 4500 4100 4100 Rated at min. displ. - - - 4200 3900 4500 Maximum at min. displ... - - - 5300 4850 5000

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Base d on SI units

Input f ow Q = (l/m in)

Outp ut torque M = (N•m)

Outp ut power P = (kW)

Motor spe ed n = (min

-1

(rpm))

Base d on US units

Input f ow Q = (US gal/min)

Outp ut torque M = (lbf•in)

Outp ut power P = (hp)

Motor spe ed n = (min

-1

(rpm))

SI units [US units]

Vg= Displacement per revolut ion cm3/rev [in

/rev]

= Ou tlet pressure bar [psi]

pi= Inlet pressure bar [psi] ∆p = pO– p

(system pressure) bar [p si]

n = Spee d min-1(rpm) ηv= Volumet ric eff ciency ηm= Mechan ical eff ciency ηt= Overall eff cie ncy (ηv• ηm)

Variables

• n

1000 •

Q • 1000 • η

• n

231 •

Vg• ∆p • η

20 • π

Q •∆p • η

600

Vg• ∆p • η

2 • π

Q •∆p • η

1714

Q • 231• η

Technical Information

Series 40 Axial Piston Motors

System design parameters

Sizing equations

Use the following equations to compute output power, torque, speed, and input flow. Selecting the right motor starts with an evaluation of system requirements such as speed and torque. Select a motor that will transmit the required torque, then select a pump that will meet the flow and pressure requirements of the motor. For more information on hydrostatic drive selection, refer to Danfoss applications guideline

BLN-9885, Selection of Drive Line Components.

Filtration

To prevent damage to the system, including premature wear, fluid entering the motor must be free of contaminants. Series 40 motors require system filtration capable of maintaining fluid cleanliness at ISO 4406-1999 class 22/18/13 or better.

Consider these factors when selecting a system filter:

Cleanliness specifications

•

Contaminant ingression rates

•

Flow capacity

•

Desired maintenance interval

•

The filter may be located either on the inlet (suction filtration) or discharge (charge pressure filtration) side of the charge pump. Series 40 pumps are available with provisions for either suction or charge pressure filtration to filter the fluid entering the charge circuit (see Loop flushing valve on page 15).

Typically, a filter with a beta ratio of β10 = 1.5 to 2.0 is adequate. However, open circuit systems supplied from a common reservoir may have considerably higher requirements. Because each system is unique, only a thorough testing and evaluation program can fully validate the filtration system. For more

Bypass valve

information, see Danfoss publication 520L0467, Design Guidelines for Hydraulic Fluid Cleanliness.

In some applications it is desirable to bypass fluid around the variable displacement pump, for example; to allow a vehicle to move short distances at low speeds without running the prime mover. This is done

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15.14 [4.00]

11.36 [3.00]

3.79 [1.00]

8.62 [125]

12.07 [175]

15.51 [225]

Charge pressure bar [psi]

19.96 [275]

22.41 [325]

25.86 [375]

7.57 [2.00]

l/min [US gal/min]

P100 643E

Technical Information

Series 40 Axial Piston Motors

System design parameters

by opening a manually operated bypass valve. This valve connects both sides of the pump/motor circuit and allows the motor to turn. During normal operation, this valve must be fully closed .

Bypass valves are available in Series 40 pumps. See Danfoss publication: 520L0635, Series 40 Pumps Technical Information.

Bypass valves are intended for moving a machine or vehicle for very short distances at very slow speeds. They are NOT intended as tow valves.

Loop flushing valve

Series 40 motors may incorporate an integral loop flushing valve. Installations that require additional fluid to be removed from the main hydraulic circuit because of fluid cooling or cleanliness requirements, will benefit from loop flushing. A loop flushing valve will remove heat and contaminants from the main loop at a rate faster than otherwise possible. Contact your Danfoss representative for production availability on specific frame size motors.

Series 40 loop flushing valves include a loop flushing relief valve with integral orifice. The flushing flow is a function of the pump charge relief valve, and the orifice size.

Loop flushing flows of 3 to 7 l/min [0.75 to 2 US gal/min] are adequate for most applications. Contact your Danfoss representative for assistance.

Warning

Incorrect charge pressure settings may result in the inability to build required system pressure and/or inadequate loop flushing flows. Maintain correct charge pressure under all conditions.

Typical loop flushing flow as a function of charge pressure

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Loop flushing relief valve with orifice

Loop flushing

shuttle valve

P100 448E

Technical Information

Series 40 Axial Piston Motors

System design parameters

Loop flushing valve

Charge Flow

Closed circuit operations require a charge pump to make up for lubrication and cooling losses, and to charge the low pressure side of the system loop. The total charge flow required is a sum of the charge flow requirements for the pump, plus the flow requirements for all motors in the system, plus any external loop flushing requirements. Ensure that adequate charge flow exists under all conditions of engine speed and motor speed and pressure.

Charge Pressure/Open Circuit Operation

M35 and M44 motors can be operated with zero pressure in the low side of the system loop. The case pressure must not be higher than 2 bar over the low side of the loop system pressure. With zero back pressure, the maximum allowed case pressure is 2 bar [29 psi]. Case drain lines must be plumbed accordingly to insure this 2 bar case pressure differential is not exceeded under any circumstances.

Redundant braking system requirement

Warning

Unintended vehicle or machine movement hazard.

Reservoir

The reservoir provides clean fluid, dissipates heat, and removes entrained air from the hydraulic fluid. It allows for fluid volume changes associated with fluid expansion and cylinder differential volumes. Minimum reservoir capacity depends on the volume needed to perform these functions. Typically, a capacity of one half the charge pump flow (per minute) is satisfactory for a closed reservoir. Open circuit systems sharing a common reservoir will require greater fluid capacity.

Locate the reservoir outlet (suction line) near the bottom, allowing clearance for settling foreign particles. Use a 100 - 125 µm screen covering the outlet port. Place the reservoir inlet (return lines) below the lowest expected fluid level, as far away from the outlet as possible. Use a baffle (or baffles) between the reservoir inlet and outlet ports to reduce aeration and fluid surging.

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Technical Information

Series 40 Axial Piston Motors

System design parameters

Overpressure protection

Series 40 motors (as well as other system components) have pressure limits. Relief valves or pressure limiters should be present in the high pressure circuit to protect components from excessive pressures.

High pressure relief valves are intended for transient overpressure protection and are not intended for continuous pressure control. Operation over relief valves for extended periods of time may result in severe heat build up. High flows over relief valves may result in pressure levels exceeding the nominal valve setting and potential damage to system components.

Caution

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Name plate

Place of manufacture

Model number

Serial number

Model code

Made in USAMade in USA

Model-No/Ident-No.Model-No/Ident-No.

R NN A A BLL DR A

FF A CNN

MMV 046 C B A B A AMMV 046 C B A B A A

R NN A A BLL DR A

FF A CNN

Model CodeModel Code

Serial-NoSerial-No

A - 96 - 26 - 12345A - 96 - 26 - 12345

M46-2001

P101372

6 C

Product

Displacement

Type

D E F G

- -

P104 427E

6 C

Product

Displacement

Type

D E F G

- -

P104 427E

Technical Information

Series 40 Axial Piston Motors

Product coding

Revised model code

The model code is a modular description of a specific product and its options. To create an order code to include the specific options desired, see the Series 40 Motor Model Code Supplement 520L0636MC.

Model code modules

Fixed motor

C Seal group D Output shaft/through shaft configuration E Endcap configuration F Cylinder block group G Housing configuration T Special hardware features Z Special features (non-hardware) *** = None

Variable motor

C Seal group D Output shaft/through shaft configuration E Endcap configuration F Control features G Housing configuration

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Technical Information

Series 40 Axial Piston Motors

Product coding

T Special hardware features Z Special features (non-hardware) *** = None

Danfoss | February 2017 520L0636 | 0703 | 19

P108697

Optional

Anti-Cavitation Valve, Port A High Pressure

Rotation Clockwise - M25 Fixed Motor

Anti-Cavitation Valve, Port B High Pressure

Rotation Counterclockwise

M35/M44 Fixed Motor

Technical Information

Series 40 Axial Piston Motors

Features and options

Anti-Cavitation Valve Option

The M25, M35 and M44 fixed motors are available with an anti-cavitation valve option. The key application for this option is open circuit fan drives.

The anti cavitation valve combines the function of a shock valve and check valve within the same cavity which is integrated into the endcap. The check valve function provides protection against cavitation that can occur upon introduction of an overrunning load or due to loss of input flow. In such case, the system delta pressure becomes negative and the check valve opens connecting the motor inlet and outlet, effectively short-circuiting the motor. The shock valve function is intended to be used for system overpressure protection events of limited duration only. It is not intended for continuous system pressure limitation.

The shock valve is available with 280 bar or 345 bar setting.

For this option the high pressure port needs to be defined upfront to get the correct motor rotation. Reversing the motor is not possible with this option.

Flow direction

Motor shaft rotation Port A Port B Special Hardware Feature Clockwise (CW) In Out NCD/NCF Counterclockwise (CCW) Out In NCE/NCG

Displacement limiters

M35, M44, and M46 variable motors have minimum displacement limiters. Minimum unit displacement is obtained with the adjuster screw at its maximum extension from the end cap or displacement control piston cover. All motors are shipped with the displacement limiter set for minimum motor displacement.

The M35 and M44 MV minimum displacement limiter is located in the end cap. The M46 MV minimum displacement limiter is located in the displacement control piston cavity. The length and configuration of this limiter will depend upon the control option installed in the motor.

M46 MV units may have an optional mechanical maximum displacement limiter located in the displacement control piston cover. The maximum displacement limit can be adjusted by loosening the

20 | © Danfoss | February 2017 520L0636 | 0703

Swashplate

Displacement limiter

P100 449E

Sealing locknut

P100 450E

Fixed minimum displacement limiter

Adjustable minimum displacement limiter

Adjustable maximum displacement limiter

Technical Information

Series 40 Axial Piston Motors

Features and options

sealing lock nut, adjusting displacement by rotating the screw with a screwdriver, then locking the adjuster by torquing the sealing lock nut.

Maximum unit displacement is obtained with the adjuster screw standing at its maximum height out of the displacement control piston cover. All motors are shipped with the limiter set for maximum motor displacement.

Undesirable output speed hazard.

Take care adjusting displacement limiters. Too low of a minimum displacement setting can result in higher than expected output speed. Retorque the sealing locknut after every adjustment to prevent an unexpected changes and to prevent external leakage.

Displacement limiter M35/M44 MV

Warning

Speed sensor option

Danfoss | February 2017 520L0636 | 0703 | 21

Displacement limiter M46 MV

Series 40 motors are available with a speed sensor option for direct measurement of motor output speed. You can use this sensor may to sense the direction and speed of motor rotation.

A special magnetic speed ring is pressed onto the outside diameter of the cylinder block. A hall effect pulse pickup is located in the motor housing. The sensor accepts supply voltage and outputs a digital

Speed sensor

Magnetic ring

Cylinder block

P100 452E

Technical Information

Series 40 Axial Piston Motors

Features and options

pulse signal in response to the speed of the ring. The output changes its high/low state as the north and south poles of the permanently magnetized speed ring pass by the face of the sensor. The digital signal is generated at frequencies suitable for microprocessor based controls.

This sensor will operate with a supply voltage of 4.5 to 15 Vdc, and requires a current of 12 mA at 5.0 Vdc (minimum) under no load. Maximum operating current is 20 mA at 5 Vdc (maximum). Maximum operating frequency is 15 kHz. Output voltage in High State (VOH) is sensor supply voltage minus 0.5 Vdc, minimum. Output voltage in Low State (VOL) is 0.5 Vdc, maximum. The sensor is available with a Packard Weather-Pack™ or 4-pin sealed connector.

Contact your Danfoss representative for production availability on specific motor frame sizes, or for special speed sensor options.

Speed sensor specifications

Supply voltage 4.5 - 15 Vdc Required current 12 mA @ 5 Vdc

Maximum current 20 mA @ 5Vdc Maximum frequency 15 kHz VOH Supply Vdc - 0.5 Vdc VOL 0.5 Vdc maximum Magnetic ring

Pulses/revolution Connector Packard Weather-PackTM

(no load)

M25 M35 M44 M46 43 46 46 51

3- pin, 4-pin

Speed sensor cross section

22 | © Danfoss | February 2017 520L0636 | 0703

Red

White

Black

Green

Supp ly voltage +

Spee d sig nal

Direction

Ground common

Packard Weather-Pack 4 pin tower conne ctor

3 pin Weather-Pack

shroud

White

Mating parts kit part number K03379 (4 pin)

Mating parts kit part number K20582 (3 pin)

Speed sensor with directional signal

Speed sensor without directional signal

Technical Information

Series 40 Axial Piston Motors

Features and options

Pulse pickup and connector

Shaft options

Shaft availability and torque ratings

N•m [lbf•in] M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV

Spline 13-tooth, 16/32 pitch

Danfoss | February 2017 520L0636 | 0703 | 23

Series 40 motors are available with a variety of splined, straight keyed, and tapered shaft ends. Nominal shaft sizes and torque ratings for some available shafts are shown in the accompanying table. Other shaft options may exist. Contact your Danfoss representative for availability.

Shaft torque for tapered shafts

The rated torque is based on the contact pressure between the shaft and hub surfaces with poor surface contact areas. With an increased quality of the contact areas, the contact pressure between the shaft and hub is increased and allows higher torque to be transmitted.

Torque ratings assume no external radial loading. Continuous torque ratings for splined shafts are based on spline tooth wear, and assume the mating spline has a minimum hardness of Rc 55 to full spline depth and coupling has good lubrication.

Maximum torque ratings are based on shaft torsional strength and assume a maximum of 200,000 load reversals.

Continuous 80 [750] 73 [650] 73 [650] 73 [650] 73 [650] 73 [650] Max 40 [1240] 226 [2000] 226 [2000] 226 [2000] 226 [2000] 226 [2000]

Technical Information

Series 40 Axial Piston Motors

Features and options

Shaft availability and torque ratings (continued)

N•m [lbf•in] M25 MF M35 MF M44 MF M35 MV M44 MV M46 MV

Spline 15-tooth, 16/32 pitch

Spline 19-tooth 16/32 pitch

Tapered 1.00 inch Max 140 [1240] 497 [4400] 497 [4400] - - 497 [4400] Straight keyed 0.875 inch Max - 226 [2000] 226 [2000] - - -

Through-shaft options

Continuous - 153 [1350] 153 [1350] 153 [1350] 153 [1350] 153 [1350] Max - 362 [3200] 362 [3200] 362 [3200] 362 [3200] 362 [3200]

Continuous - - - - - 194 [1710] Max - - - - - 460 [4070]

Recommended mating splines for Series 40 splined output shafts should be in accordance with ANSI B92.1 Class 5. Danfoss external splines are modified Class 5 Fillet Root Side Fit. The external spline Major Diameter and Circular Tooth Thickness dimensions are reduced in order to assure a clearance fit with the mating spline.

Optional through-shafts are available on Series 40 fixed and variable displacement motors (as noted in the accompanying table). Through-shafts are provided for use in secondary (parking) braking systems. Through-shaft ends are not intended for continuous power transmission.

Through-shaft availability and torque limitations

Frame size Shaft spline Max. torque limit

N•m [lbf•in]

M35 MF 13T 16/32 P 328 [2900] M44 MF 13T 16/32 P 328 [2900] M46 MV(SAE) 13T 16/32 P 328 [2900]

Warning

Potential loss of braking capacity.

Exceeding these torque limits could cause shaft breakage. Ensure your application never exceeds maximum torque limits under any operating conditions.

24 | © Danfoss | February 2017 520L0636 | 0703

20.638 [0.8125] pitch dia. 30° pressure angle 13 teeth,16/32 pitch fillet root side fit per ANSI B92.1 class 5 also mates with flat root side fit

21.717 dia. [0.8550]

18.8 max. [0.74]

16.5 [0.65] Full spline

7.9 [0.31]

33.32 max. [1.312]

Coupling must not protrude beyond this surface

Mounting

flange

(ref.)

P104 428E

0.750-16 UNF-2A thd.

22.22 Gauge dia. [0.875]

38.1 [1.500] taper per foot per SAE J5001

25.4 [1.000] nominal shaft dia.

3.81 max. [0.150]

6.30 x 22.22 dia. Woodruff key [0.248x0.875]

0.25 [0.01] min. R on edges

33.3 Gauge dim. [1.311]

42.8 [1.68]

27 [1.06]

Coupling must not protrude beyond

25.4 max. [1.000]

Mounting

flange

(ref.)

P104 429E

22.22 Gauge dia. [0.875]

3.8 max. [0.15]

6.30 x 22.22 dia. Woodruff key [0.248 x 0.875]

0.25 [0.01] min. R. on edges

48.47 ± 1.12 [1.908 ± 0.44]

26.97 [1.06]

Coupling must not protrude beyond this point

Mounting

flange

P108 717E

3/4-16 UNF Thd.

9.17 ± 0.38 [0.361 ± 0.015] Gauge dimension

13.47 ± 0.99 [0.53 ± 0.039]

T dia.

V dia.

W pitch dia. 30° pressure angle Y teeth, Z pitch fillet root side fit per ANSI B92.1-1970 class no.5 also mates with flat root side fit

7.65 [0.301]

Coupling must not protrude beyond this surface

Mounting

flange

(ref.)

P104 430E

Technical Information

Series 40 Axial Piston Motors

Shaft options

M25 MF

Code Description Torque rating N•m [lbf•in] Drawing

Max. torque rating Cont. torque rating

13-tooth 16/32 pitch (ANSI B92.1 1970 - Class

140 [1240] 80 [750]

Ø 25.4 mm [1.000 in]

140 [1240] —

1:8 taper

Ø 25.4 mm [1.000 in]

140 [1240] —

1:8 taper - with dust seal

M35/44 MF

Code Description Torque rating Drawing

Maximum torque rating N•m [lbf•in]

A, C Splined output shaft F 15 tooth 362 [3200] 15 tooth 153 [1350]

(see table)

13 tooth 226 [2000] 13 tooth 73 [650]

Continuous torque rating N•m [lbf•in]

Danfoss | February 2017 520L0636 | 0703 | 25

0.750-16 UNF-2A thd.

22.22 gauge dia. [0.875]

38.1 [1.500] taper per foot per SAE J501

25.4 [1.000] nominal shaft dia.

3.81 max. [0.150]

6.30 x 22.22 dia. Woodruff key [0.248 x 0.875]

0.25 [0.01] min. R on edges

33.3 gauge dim. [1.311]

42.8 [1.68]

27 [1.06]

Coupling must not protrude beyond

25.4 max. [1.000]

Mounting

flange

(ref.)

P104 431E

Coupling must not protrude beyond this surface

7.65 [0.301]

22.2 dia. [0.874 ± 0.001]

2.84 max. [0.112]

6.35 [0.250] sq. key

38.1 [1.500] long

0.38 [0.015] min. R on edges

64.74 ±0.025

[2.549] ±0.64

9.4 [0.37]

Mounting

flange

(ref.)

P104 432E

± 0.03

T dia.

V dia.

W pitch dia. 30° pressure angle Y teeth, 16/32 pitch fillet root side fit per ANSI B92.1 class no.5 also mates with flat root side fit

Coupling must not protrude beyond this surface

7.87

[0.310]

Mounting

flange

(ref.)

P104 433E

Technical Information

Series 40 Axial Piston Motors

Shaft options

M35 / M44 MF splined shaft option

Shaft option Shaft lengthSShaft

diameter T

A 33.55 [1.321] 18.8 [0.74] 16.5 [0.65] 21.72 [0.8550] 20.638 [0.8125] 13 16/32 C 33.55 [1.321] 18.8 [0.74] 16.5 [0.65] 21.72 [0.8550] 20.638 [0.8125] 13 16/32 13T F 33.55 [1.321] 21.98 [0.865] 18.5 [0.73] 24.89 [0.9800] 23.812 [0.9375] 15 16/32 -

Code Description Torque rating Drawing

Maximum torque rating N•m [lbf•in]

Ø 25.4 mm [1.000 in]

497 [4400] —

1:8 taper

Full spline U

Major dia. V

Continuous torque rating N•m [lbf•in]

Pitch dia. W

No. teeth Y

Pitch Z

Thru shaft

Ø 22.2 mm [0.874 in]

226 [2000] —

straight keyed

M35/44 MV

Code Description Torque rating Drawing

Maximum torque rating N•m [lbf•in]

A Splined output shaft

73 [650] 226 [2000]

(see table)

26 | © Danfoss | February 2017 520L0636 | 0703

Continuous torque rating N•m [lbf•in]

W pitch dia. 30° pressure angle Y teeth, Z pitch fillet root side fit per ANSI B92.1 class no.5 also mates with flat root side fit

V dia.

U Full Spline

S max.

T max. dia.

7.47 [0.294]

Mounting

flange

(ref.)

Coupling must not protrude beyond this surface

P104 434E

5.05 [0.199]

6.30 x 22.22 dia. woodruff key [0.248 x 0.875] 1/8 taper [1.500 per foot] per SAE standard J501

25.4 [1.000] nominal shaft dia.

37.62

[1.481]

36.58 [1.440]

max.

26.97 [1.062]

9.17 gauge dim. [0.361]

Coupling must not protrude beyond this surface

3/4 - 16 Thd.

22.22 [0.875] gauge dia.

Mounting

flange

(ref.)

P104 435E

Technical Information

Series 40 Axial Piston Motors

Shaft options

M35 / M44 MV splined shaft option

Shaft option Max. coupling

engagement S

A 33.3 [1.31] 18.8 [0.74] 16.5 [0.65] 21.72 [0.855] 20.638 [0.8125] 13 16/32 -

M46 MV

Code Description Torque rating Drawing

A, B, Splined output shaft E, F, 15 tooth 362 [3200] 15 tooth 153 [1350] D

(see table)

Shaft diameter T

Maximum torque rating N•m [lbf•in]

Full spline length U

Major dia. V

Continuous torque rating N•m [lbf•in]

13 tooth 226 [2000] 13 tooth 73 [650]

19 tooth 460 [4070] 19 tooth 194 [1710]

Pitch dia. W

No. teeth Y

Pitch Thru shaft

J 25.4 [1.000] tapered

— 497 [4400]

shaft

M46 MV splined shaft option

Shaft option Shaft

extension R

A 32.94 [1.297] 32 [1.26] 19.1 [0.75] 15.8 [0.62] 21.72 [0.855] 20.638

B 32.94 [1.297] 32 [1.26] 19.1 [0.75] 15.8 [0.62] 21.72 [0.855] 20.628

E 37.72 [1.485] 36.6 [1.44] 22.3 [0.88] 22.86 [0.90] 24.89 [0.980] 23.812

F 37.72 [1.485] 36.6

D 37.72 [1.485] 36 [1.44] 28.4 [1.114] 22.35 [0.88] 31.24 [1.230] 30.162

Danfoss | February 2017 520L0636 | 0703 | 27

Max. coupling engagement

Shaft diameter T

Fullspline length U

Major dia.VPitch dia.WNo. teethYPitch

13 16/32 ---

[0.8125]

13 16/32 13T

[0.8125]

15 16/32 ---

[0.9375]

[1.44]

22.3 [0.88] 22.86 [0.90] 24.89 [0.980] 23.812 [0.9375]

15 16/32 13T

19 16/32 ---

[1.1875]

Contact Danfoss Application Engineering for specific installation drawings.

Thru shaft

Minimum

swashplate angle

16° for M35 16° for M44

P100 457E

100%

Min.

Trunnion rotation

displacemen

P100 458E

Technical Information

Series 40 Axial Piston Motors

Control options

Direct displacement control (DDC)

Unintended vehicle movement hazard.

Internal forces may not return the swashplate to the neutral position under all operating conditions.

The direct displacement control is available on either side of the M35 and M44 variable motors. It provides a simple, positive method of displacement control. Movement of the control shaft causes a proportional swashplate movement, thus varying the motor's displacement from full to minimum displacement.

Neutral position is not factory set, nor is there any internal neutral return mechanism. The application must include provisions for all control linkage and neutral return functionality.

External Control Handle Requirements

Maximum allowable trunnion torque is 79.1 N•m [700 lbf•in]. Minimum torque necessary to hold the swashplate per 70 bar of differential system pressure is 11.3 N•m [100 lbf•in]. Maximum trunnion angle is 16° for M35 and M44.

DDC on left side of M35 motor

Warning

Motor displacement vs swashplate rotation

DDC input specifications

Max. torque N•m [lbf•in] 79.1 [700] Min. torque to hold (per 70 bar

[1000 psi] system pressure) N•m [lbf•in]

Max. angle 16°

11.3 [100]

28 | © Danfoss | February 2017 520L0636 | 0703

Port X1

Control pressure supply

(for minimum displacement)

Port X2

Control pressure supply

(for maximum displacement)

Top

Bottom

Single-line control

Two-line control

Technical Information

Series 40 Axial Piston Motors

Control options

Two-position hydraulic control

Series 40 M46 variable displacement motors are equipped with a hydraulically controlled swashplate. The motor is spring biased toward maximum displacement. A hydraulic piston is used to shift the swashplate from maximum to minimum displacement. A single or two-line control can regulate the servo piston.

With the standard single-line control option, hydraulic pressure is supplied to the control port (X1) to shift the motor to minimum displacement. The opposite end of the displacement control piston internally drains to the motor case. The swashplate shifts with a minimum pressure of 13.8 bar [200 psi]. The bias spring returns the motor to maximum displacement when control pressure is removed.

The single-line control generally uses a customer supplied 2-position, 3-way control valve. Hydraulic pressure on the control piston must not exceed 27.6 bar [400 psi].

In applications which encounter frequent shifting on-the-go as part of the normal duty cycle, we recommend the optional two-line control. Applications with routine shifting from work range to travel range may not require the two-line control. to command minimum displacement, port control pressure to port X1 and drain port X2. To command maximum displacement, port control pressure to port X2 and drain port X1.

The two-line control generally uses a customer supplied 2-position, 4-way control valve. Hydraulic pressure on the control piston must not exceed 27.6 bar (400 psi).

Orifices in either (or both) the control valve supply and drain lines optimize the shift rate for either the single or two-line control. Contact your Danfoss representative for additional information.

Input specifications bar [psi]

Single line control Two line control

Max. pressure on control 27.6 [400] 27.6 [400] Min. pressure to shift 13.8 [200] 13.8 [200] Control valve

(customer supplied)

2-position / 3 way 2-position / 4-way

M46 2-position hydraulic controls

Danfoss | February 2017 520L0636 | 0703 | 29

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M25 MF: axial ports, twin ports, loop flushing, speed sensor

Flow direction

Motor shaft rotation Port A Port B Clockwise (CW) In Out Counterclockwise (CCW) Out In

30 | © Danfoss | February 2017 520L0636 | 0703

65.91

[2.595]

26.67 [1.050]

7/8 - 14* Port A (Twin)

7/8 - 14*

Port B (Twin)

78.9

[3.11]

64.26 [2.530]

26.67 [1.050]

25.4 [1.000]

56.9

[2.24]

64.8 [2.55]

162.8

[6.41]

134.5 [5.29]

64.97 [2.558]

101.57 [3.999]

3/4 - 16 SAE*

case outlet L1

76.7

[3.02]

9.4 [0.37]

48.8

[1.92]

7/16 - 20 UNF* System pressure

gauge ports M1, M2

3/4 - 16* case outlet (alternate) L2

3.89

[98.9]

Loop flushing relief valve

Loop flushing shuttle valve

143.0 [5.63]

Speed sensor option

7/8 - 14* Port A (Axial)

7/8 - 14* Port B (Axial)

94.488 [3.72]

P100565E

Axial or Twin Ports

With Loop Flushing

Packard Weather-pack 4-way connector (male) mates with Packard part no. 12015797 4-way tower (female) or Danfoss kit no. K03384

Technical Information

Series 40 Axial Piston Motors

Installation drawings

Danfoss | February 2017 520L0636 | 0703 | 31

87.2

[3.44]

(2) places

73.02

[2.875]

(2) places

14.27 [0.562] dia. (2) places

CCW

P100566E

66.55 [2.620] Case drain - L1 and L2 both sides

70.36 [2.77]

(2) places

87.25

[3.435]

(2) places

14.27 dia. [0.562] (2) places

Approx. center of gravity

CCW

4.06

[0.16]

P100569E

Technical Information

Series 40 Axial Piston Motors

Installation drawings

*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specified. Shaft rotation is determined by viewing motor from output shaft end. Contact Danfoss Application Engineering for specific installation drawings.

M25 MF: mounting flange

M35/M44 MF: mounting flange

32 | © Danfoss | February 2017 520L0636 | 0703

77.1

[3.04]

79.5

[3.13]

71.9

[2.83]

Port A

77.7

[3.06]

(2) Places

Port B

7/16 -20* System pressure gauge port - M1

7/16 -20* System pressure gauge port - M2

23.9

[0.94]

(2) Places

Loop flushing valve (option)

78.2

[3.08]

1-1/16 -12

(2) places

154.6 [6.08]

186.3 [7.34]

92.1

[3.63]

12.8

[0.51]

99.1

[3.90]

Loop flushing shuttle valve (option)

P100567E

44.4

[1.75]

71.9

[2.83]

84.8

[3.34]

1-1/16 -12 O-ring boss Per SAE J514 (2) places

40.1

[1.58]

(2) places

184.9 [7.28]

186.8 [7.34]

30.

[1.200]

7/8 -14

Case drain - L3

O-ring boss Per SAE J514

Axial Ported Endcap

Twin Ports

92.1

[3.62]

7/8 -14

Alternate case drain - L2

O-ring boss Per SAE J514

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M35/M44 MF: axial ports, twin ports, loop flushing, speed sensor

Flow direction

Motor shaft rotation Port A Port B Clockwise In Out Counterclockwise Out In

Danfoss | February 2017 520L0636 | 0703 | 33

P108708E

72.2 [2.84]

77.7 [3.06]

Port B

Port A

28.6 [1.13]

(2x)

Anti-Cavitation Valve Port B

7/16-20 Str. Thd. O-ring boss

Per SAE J514 System Pressure Gauge Port - M2

23.9

[0.94]

76.3

[3.00]

(2x)

7/16-20 Str. Thd. O-ring boss Per SAE J514

System Pressure Gauge Port - M1

Anti-Cavitation Valve Port A

78.1 [3.07]

187.1 [7.37]

155.3 [6.11]

Ports

and

6.63 ± 0.635 [0.261 ± 0.025]

39.35

± 0.635

Coupling must not protrude beyond this surface

6.35

+ 0.000

[0.312]

- 0.002

+ 0.00

7.89

- 0.05

Sq. Key.

25.4 [1.00] long R. 0.5 [0.02]

on edges

3.4 [0.133] Max.

28.55 ± 0.03

[1.124 ± 0.001]

155.3 [6.11]

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M35/M44 MF: radial ports, twin ports, anti-cavitation valve

186.3 [7.34]

184.9 [7.28]

17.8

[0.70]

154.6 [6.09]

161.3 [6.35]

1-1/16 -12* (2) places

92.1

[3.63]

12.8 [0.51]

99.1

[3.90]

Approx center of gravity

7/8 -14* Case drain - L2

67.3 [2.65]

(2) places

89.7

[3.53]

71.9

[2.83]

77.7

[3.06]

(2) places

65.9

[2.60]

(2) places

7/8 -14*

Case drain - L3

44.5

[1.75]

Port B

Port A

Aux. shaft option

20.638 [0.8125] pitch diameter 30° pressure angle 13 teeth, 16/32 pitch fillet root side fit

ANSI B92.1-1790 class no. 5 also mates with flat root side fit

161.3 [6.35]

184.0 [7.25]

218.29 [8.594]

1-1/16 -12* (2) places

21.72 [0.855]

21.1 [0.83]

Fulll spline length

36.8 max. [1.45]

Coupling must not protrude beyond

this surface

6.3

[0.25]

151.00 [5.95]

7/8 -14*

Case drain - L3

[1.14]

(2) Places

67.3

[2.63]

89.7 [3.53]

71.9 [2.83]

70.5

[2.77]

50.813 [2.000]

65.91

[2.60]

1/2 -13 Thd. 92 [23.3] min. full Thd.

(2) places

67.3

[2.63]

92.1 [3.63]

12.8 [0.51]

99.1 [3.90]

Approx. center of gravity

7/8 -14* Case drain - L2

P100568

Side Ports

Side Ports with thru shaft

Auxiliary drive spline data:

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M35/M44 MF: side ports, through shaft

Danfoss | February 2017 520L0636 | 0703 | 35

164.7 [6.48]

96.4

[3.80] 1-1/16 -12* Case outlet

1-1/16 -12* Port A

1-1/16 -12*

Port B

[1.38]

[3.74]

7.6

[0.301]

16° max.

Disp.

min. Disp.

66.7

[2.63]

12.6

[0.50]

Port B

Port A

9/16 -18* system pressure gauge Port M1

Displacement limiter

9/16 -18* System pressure

gauge Port M2

92.2

[3.63]

96.5 [3.80]

80.5

[3.17]

101.57

[3.999]

P100570E

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M35/M44 MV: twin ports

CCW

125

[4.92]

111.

[4.40]

70.4

[2.77]

Control trunnion

left side

option L

Control trunnion right side option R

87.25 [3.44]

73.03

[2.875]

45°

19.01 [0.750] (2) places

19.84

[0 .781]

14.5 dia. [0.562]

(2) places

P100571

Trunion Control

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M35/M44 MV: mounting flange, trunnion control

M46 MV: side ports, loop flushing

Flow direction

Motor shaft direction Port A Port B Clockwise (CW) Out In Counterclockwise (CCW) In Out

Danfoss | February 2017 520L0636 | 0703 | 37

72.6 min. [2.86]

101.6 dia. [4.000]

30 [1.18]

(2) places

228

[8.98]

139.6 [5.50] (2) places

9.7 [0.38]

22.61 [0 .890]

63.5 [2.50] (4) places

71.6 [2.82] (4) places

1-5/16 - 12*

port B

82.6 [3.25] (to L2)

1-5/16 - 12* port A

200.5 [7.90]

Case outlet L2

(alternate)

X1 (ref.)

X2 (ref.)

case outlet L1 (opposite side)

1-1/16 - 12* case outlets

ports L1 and L2

71.1 [2.80] (2) places

74.7 [2.94] (2) places

68.1 [2.68] (to L1)

1-5/16 - 12*

Port B

1-5/16 - 12* Port A

229.7 [9.04]

194.7 [7.66]

Loop flushing shuttle valve

Loop flushing

relief valve

7/16 - 20* gauge ports M1 and M2

98.3

[3.87]

80.9

[3.19]

68.8 [2.71] (2) places

P100572

Radial (side) Ports without Loop Flushing

Radial (side) Ports with Loop Flushing

Technical Information

Series 40 Axial Piston Motors

Installation drawings

1-1/16 - 12* port B

229.7 [9.04]

Loop flushing shuttle valve

Loop flushing

relief valve

7/16 - 20* gauge ports M1 and M2

98.3

[3.87]

80.9

[3.19]

71.6 [2.82] (2) places

42.4 [1.67] (2) places

1-1/16 - 12*

port A

63.5

[2.50]

89.7 [3.53] w/o loop

flushing

P100 573E

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M46 MV: axial ports, loop flushing

Axial ports w/ loop flushing

Danfoss | February 2017 520L0636 | 0703 | 39

50.8

[2.00]

(2) places

1/2 - 13 Thd.

thru

(2) places

58.9

[2.32]

(2) places

50.813

[2.0005]

21.717 [0.8550]

21.1 [0.83] Full Spline

20.638 [0.8125] pitch dia. 30° pressure angle

13 teeth, 16/32 pitch

fillet root side fit

per ANSI B92.1, class no.5

(also mates with flat

root side fit)

25.4 [1.00]

7.7

[0.303]

40.0 [1.57] max.

37.3 [1.47]

1-1/16 - 12* port B

68.5

[2.69]

1-1/16 - 12*

port A

29.7 [1.17] (2) places

7/16 - 20* gauge ports M1 and M2

229.7

[9.04] Loop flushing shuttle valve

98.3

[3.87]

Loop flushing

relief valve

13.49 dia. thru [0.531]

(2) places

199.6 [7.86]

89.7 [3.53] w/o loop

flushing

P100574

Side Ports with Thru Shaft

Radial (side) Ported with Loop Flushing with Thru Shaft

Radial (twin) Ports with Loop Flushing

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M46 MV: side ports, thru shaft twin ports, loop flushing

[3.23]

14.27 dia. thru [0.562] (2) places

87.2

[3.44]

(2) places

115.1

[4.53]

73.7

[2.90]

73.02

[2.875]

(2) places

89.1

[3.51]

CCW

P100575E

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M46 MV: mounting flange

Danfoss | February 2017 520L0636 | 0703 | 41

99.6 max. [3.92]

104.1 [4.10]

100.6 max [3.96]

89.1

[3.51]

(ref)

80.5

[3.17]

Min. displacement adjustment screw (3/16 in. internal hex)

Max. displacement adjustment screw (screwdriver slot)

9/16 - 18*

Control pressure port X1

103.9 [4.09]

80.5

[3.17]

80.5

[3.17]

9/16 - 18* Control pressure port X2

9/16 - 18*

Control pressure port X1

78.7

[3.10]

Both sides

78.7

[3.10]

P100576

Control w/ bottom pressure supply port and externally adjustable displacement limiters

Control w/ top and bottom pressure supply ports

Technical Information

Series 40 Axial Piston Motors

Installation drawings

M46 MV: control ports

P100579

L1M2

L2M1

L1M2

L2M1

M25/M35/M44 fixed motor schematics (no loop flushing)

M25/M35/M44 fixed motor schematics

M35/M44 variable motor schematics

M46 variable motor schematics

Technical Information

Series 40 Axial Piston Motors

Schematics

Motor Schematics

Danfoss | February 2017 520L0636 | 0703 | 43

Danfoss Power Solutions GmbH & Co. OHG

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Nordborgvej 81 DK-6430 Nordborg, Denmark Phone: +45 7488 2222

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2800 East 13th Street Ames, IA 50010, USA Phone: +1 515 239 6000

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Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic and electronic components. We specialize in providing state-of-the-art technology and solutions that excel in the harsh operating conditions of the mobile off-highway market. Building on our extensive applications expertise, we work closely with our customers to ensure exceptional performance for a broad range of off-highway vehicles.

We help OEMs around the world speed up system development, reduce costs and bring vehicles to market faster.

Danfoss – Your Strongest Partner in Mobile Hydraulics.

Go to www.powersolutions.danfoss.com for further product information.

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Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without changes being necessary in specifications already agreed. All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

Danfoss | February 2017 520L0636 | 0703

Danfoss Series 40 Axial Piston Motors Technical Information

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

General description

Basic design

Key features

Cross sections

System circuit diagram

M46 motor schematic

Technical Specifications

Overview

General

Features and options

Specifications

Operating parameters

Fluid specifications

Hydraulic unit life

Performance

Bearing life and external shaft loading

Operating Parameters

Fluids

Viscosity

Temperature

Case pressure

System Pressure

Speed ratings

System design parameters

Sizing equations

Filtration

Bypass valve

Loop flushing valve

Charge Flow

Charge Pressure/Open Circuit Operation

Redundant braking system requirement

Reservoir

Overpressure protection

Product coding

Revised model code

Model code modules

Fixed motor

Variable motor

Features and options

Anti-Cavitation Valve Option

Displacement limiters

Speed sensor option

Pulse pickup and connector

Shaft options

Through-shaft options

Shaft options

M25 MF

M35/44 MF

M35/44 MV

M46 MV

Control options

Direct displacement control (DDC)

External Control Handle Requirements

Two-position hydraulic control

Installation drawings

M25 MF: axial ports, twin ports, loop flushing, speed sensor

M25 MF: mounting flange

M35/M44 MF: mounting flange

M35/M44 MF: axial ports, twin ports, loop flushing, speed sensor

M35/M44 MF: radial ports, twin ports, anti-cavitation valve

M35/M44 MF: side ports, through shaft

M35/M44 MV: twin ports

M35/M44 MV: mounting flange, trunnion control

M46 MV: side ports, loop flushing

M46 MV: axial ports, loop flushing

M46 MV: side ports, thru shaft twin ports, loop flushing

M46 MV: mounting flange

M46 MV: control ports

Schematics

Motor Schematics