Danfoss 42 4T 41/51 User guide

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Technical Information

Series 42 4T Axial Piston Tandem Pumps

Size 41/51

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Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Revision history Table of revisions

Date Changed Rev

November 2020 Minor update in Hydraulic Fluid Parameters 0302

July 2020 Changed document number from 'BC00000036' to 'BC152886482857' 0301

December 2018 Corrected technical data in System Parameters 0201

June 2016 converted to new layout 0101

May 2015 Converted to DITA CMS BA

February 2008 Corrections-Drawings AB

January 2008 First edition AA

2 | © Danfoss | November 2020 BC152886482857en-000302

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Series 42 warehouse

General Description

Basic Design........................................................................................................................................................................................6

System Diagram................................................................................................................................................................................7

System Schematic............................................................................................................................................................................ 8

Technical Specifications

System Specifications...................................................................................................................................................................10

System Parameters........................................................................................................................................................................10

Hydraulic Fluid Parameters........................................................................................................................................................ 11

Operating Parameters

System Requirements...................................................................................................................................................................12

System Parameters........................................................................................................................................................................12

Hydraulic Fluid Parameters........................................................................................................................................................ 13

Sizing Equations............................................................................................................................................................................. 14

System Design Parameters

Fluid and Filtration........................................................................................................................................................................ 15

Filtration Configuration...............................................................................................................................................................15

Mounting Flange Loads...............................................................................................................................................................16

Estimating Overhung Load Moment.................................................................................................................................16

Case Drain.........................................................................................................................................................................................17

External Shaft Load and Bearing Life......................................................................................................................................17

Hydraulic Unit Life......................................................................................................................................................................... 18

Efficiency Graphs............................................................................................................................................................................19

Features and Options

Charge Pump...................................................................................................................................................................................20

Charge Pump Sizing Example:.............................................................................................................................................20

Charge Relief Valve........................................................................................................................................................................20

Overpressure Protection............................................................................................................................................................. 21

Bypass Valve.....................................................................................................................................................................................22

Displacement Limiters................................................................................................................................................................. 22

Shaft Options...................................................................................................................................................................................22

Auxiliary Mounting Pads............................................................................................................................................................. 23

Center Coupling............................................................................................................................................................................. 24

Control Selection............................................................................................................................................................................24

Manual Displacement Control (MDC).....................................................................................................................................26

Features and Benefit of MDC................................................................................................................................................26

Control Input Signal.................................................................................................................................................................27

Response Time...........................................................................................................................................................................27

Control Handles.........................................................................................................................................................................28

Electric Solenoid Override to Neutral................................................................................................................................28

Emergency Override to Neutral with Port for Brake Pressure Release..................................................................29

Neutral Start Switch (NSS)..................................................................................................................................................... 30

NSS with Back-up Alarm (BUA) Switch..............................................................................................................................30

Connectors..................................................................................................................................................................................30

Non-Feedback, Proportional Hydraulic (NFPH) Control.................................................................................................. 32

Features and Benefits of the NFPH control..................................................................................................................... 33

Connectors and Port locations............................................................................................................................................ 33

Installation Drawings

Manual Displacement Control (MDC).....................................................................................................................................34

Port Description........................................................................................................................................................................ 34

Dimensions................................................................................................................................................................................. 36

Non-Feedback, Proportional Hydraulic (NFPH).................................................................................................................. 39

Port Description........................................................................................................................................................................ 39

Dimensions................................................................................................................................................................................. 41

Shaft Options...................................................................................................................................................................................44

Displacement Limiter................................................................................................................................................................... 45

Danfoss | November 2020 BC152886482857en-000302 | 3

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Contents

By-pass Valve...................................................................................................................................................................................46

Control Modules.............................................................................................................................................................................46

Auxiliary Mounting Pads............................................................................................................................................................. 48

Model Code

Model Code: A, Y, Z........................................................................................................................................................................50

Model Code: FD, FX, RD, RX........................................................................................................................................................51

Model Code: FE, RE........................................................................................................................................................................ 52

Model Code: FT, RT, FH, RH, FJ, RJ, FK, RK..............................................................................................................................53

Model Code: FL, RL, FM. RM........................................................................................................................................................54

Model Code: C, F, S........................................................................................................................................................................ 56

Model Code: U, G, V.......................................................................................................................................................................57

Model Code: N, P............................................................................................................................................................................58

4 | © Danfoss | November 2020 BC152886482857en-000302

Piston centering spring

Servo piston

P100412E

P400169

X2 X1

100%

15 18

1518

P001628E

Signal Dp (bar)

Dp system=345bar

Dp system=35bar

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Series 42 warehouse

Pump displacement versus signal pressure

NFPH pump displacement to Input signal

Non-feedback proportional hydraulic control schematic

Danfoss | November 2020 BC152886482857en-000302 | 5

Piston Swashplate

Roller bearing

Valve plate

Ball bearing

P400160

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

General Description

Basic Design

S42 Integrated Tandem Pumps (4T) are advanced hydrostatic units for medium power applications with maximum loads of 415 Bar [6020 psi] (41 cm3) and 350 Bar [5075 psi] (51 cm3). You can combine these pumps with a suitable Danfoss motor or other products in a system to transfer and control hydraulic power.

The 4T axial piston pump is a compact, high power density unit, using the parallel axial piston/slipper concept in conjunction with tiltable swashplates to vary the pumps’ displacements.

Reversing the angle of the swashplate reverses the flow of fluid from the pump, and reversing the direction of rotation of the motor output. 4T axial piston pumps provide an infinitely variable speed range between zero and maximum in both forward and reverse.

4T axial piston pumps use a cradle swashplate design with a hydraulic servo control cylinder. Control is provided through a compact servo control system. Two types of servo controls are available. These include mechanical hydraulic actuated feedback controls, and hydraulic proportional control. These controls feature low hysteresis and responsive performance.

Cross-sectional view

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Reservoir

Suction Screen

Charge Pressure Relief Valve

Servo Control Cylinder

Swash Plate

Bypass Check

Heat Exchanger

Control Handle

Displacement Control Spool

Cylinder Block Assembly

Valiable Displacement Pump

Charge Pump

System Pressure

Control Pressure

Low Loop Pressure

Suction/Case Drain/ System Return

Charge Pressure

P106 147E

Loop Flushing Valve

Motor Gear boxMotorGear box

Loop Flushing Valve

Input Shaft

Charge check/ HPRV valve

Brake release control valve

Motor displacement control valve

Filter

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

General Description

System Diagram

Danfoss | November 2020 BC152886482857en-000302 | 7

P400161

M1M1 M2

B C DA

Front Rear

GearboxGearbox MotorMotor

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

General Description

System Schematic

4T Axial Piston Pump

The illustration above shows a schematic of a 4T axial piston pump. System ports A, C and B, D connect to the high pressure work lines. Return fluid is received from its inlet port and discharged through the outlet port. Flow direction is determined by swashplate position. You can read system port pressure through ports M1 and M2. The pump has two case drains (L1 and L2) to ensure there is lubricating fluid in the

8 | © Danfoss | November 2020 BC152886482857en-000302

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

General Description

system. This schematic includes a manual displacement control. For other control schematics see the related control section: Manual Displacement Control (MDC) on page 26, Non-Feedback, Proportional

Hydraulic (NFPH) Control on page 32

Danfoss | November 2020 BC152886482857en-000302 | 9

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Technical Specifications

System Specifications

General Specifications

Feature Series 42 4T

Pump type

Direction of input rotation Clockwise or counterclockwise

Recommended installation position

Other system requirements Independent braking system, suitable reservoir and heat exchanger.

Hardware Features

Pump configuration Single variable pump

Displacement

Weight

Mass moment of inertia

Type of front mounting flange

(SAE flange size per SAE J744)

Port connections SAE-twin ports, radial, opposite side ports

System pressure regulation

Displacement limiters Option Input shaft options Splined Auxiliary mounting pad

(SAE pad per SAE J744)

Control options MDC, NFPH Loop flushing None

cm [in3]

kgf [lbf]

kg•m [lbf•ft2]

bar [psi]

In-line, axial piston, positive displacement pumps including cradle swashplate and servo control

Pump installation recommended with control position on the top or side. Consult Danfoss for non conformance guidelines. The housing must always be filled with hydraulic fluid.

40.9 [2.50] x 2 51 [3.11] x 2

MDC: 76 [168] NFPH: 72 [158]

0.0072 [0.0054] 0.0076 [0.0056]

2 Bolt SAE C (4 additional bolt holes available)

210-415 [3045-6020] 210-325 [3045-4715]

SAE A (9 tooth, 11 tooth and 13 tooth) SAE B (13 tooth)

System Parameters

Case pressure

Continuous pressure

Maximum pressure (cold start)

bar [psi]

3 [44]

10.3 [150]

Pressure Limits

bar [psi]

41 51

350 [5075] 325 [4713]

450 [6265] 400 [5800]

Displacement cm

Rated pressure

Maximum pressure

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Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Technical Specifications

Speed Limits

Frame size cm

Minimum speed

Rated speed at maximum displacement

Maximum speed at maximum displacement

Charge Pump Displacement and Setting Pressure

Frame size cm

Internal -

Charge relief valve settings

Theoretical Flow

Frame size cm

Theoretical flow at rated speed

Standard Optional 14-24 [203-340]

-1

min (rpm)

-1

min (rpm)

-1

min (rpm)

cm3/rev [in3/rev]

bar [psi]

l/min [US gal/ min]

41 51

500

3200 2900

3450 3400

41 51

none none

20 [290]

41 51

131 [34.6] 148 [39.1]

Hydraulic Fluid Parameters

Check/high Pressure Relief Valve

Options

Setting —

bar [psi]

No relief valve /check only Relief valve / check

210-415 [3045-6020] or by setting available 210, 250, 280, 300, 325, 345, 360, 385, 415

Fluid temperature range

Minimum -40 °C [-40 °F] Intermittent, cold start Maximum continuous 104 °C [220 °F] - Maximum 115 °C [240 °F] Intermittent

Fluid cleanliness level

Required fluid cleanliness level ISO 4406 Class 22/18/13

Fluid viscosity

Minimum 7.0 mm2/s (cSt) Intermittent Recommended operating range 12-60 mm2/s (cSt) Maximum 1600 mm2/s (cSt) Intermittent, cold start

Danfoss | November 2020 BC152886482857en-000302 | 11

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Operating Parameters

System Requirements

Independent braking system

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.

Reservoir

Design the system to accommodate maximum volume changes during all system operating modes and to promote de-aeration of the fluid as it passes through the tank. Minimum reservoir volume is 5/8 of the maximum charge pump flow per minute with a minimum fluid volume equal to 1/2 of the maximum charge pump flow per minute. At the maximum return flow, this allows 30 seconds fluid dwell for removing entrained air. This is adequate for a closed reservoir (no breather) in most applications. Position the reservoir outlet (pump inlet) above the bottom of the reservoir to take advantage of gravity separation and prevent large foreign particles from entering the charge inlet line. Use a 100 - 125 μm screen over the outlet port. Position the reservoir inlet (fluid return) so that flow to the reservoir is discharged below the normal fluid level, and directed into the interior of the reservoir for maximum dwell and efficient de-aeration. Use a baffle (or baffles) between the inlet and outlet ports to promote deaeration and reduce surging of the fluid.

System Parameters

Speed limits

Rated speed is the speed limit we recommend at full power condition and is the highest value at which you can expect normal life. Maximum speed is the highest operating speed we permit. You cannot operate above this speed without risk of immediate failure and loss of drive line power and hydrostatic braking capacity (which may create a hazard). In mobile applications, you must apply this pump with a speed speed below the stated maximum. Consult Pressure and Speed Limits, BC152886484313, when determining speed limits for a particular application.

Inlet pressure

Control charge pump inlet conditions to achieve expected life and performance. Ensure a continuous inlet pressure of not less than 0.8 bar absolute (not more than 6 in Hg vacuum). Normal pressures less than 0.7 bar absolute (greater than 9 in Hg vacuum) indicate inadequate inlet design or a restricted filter. Pressures less than 0.7 bar absolute (greater than 9 in Hg vac) during cold start are possible, but should improve quickly as the fluid warms. Never exceed the maximum inlet vacuum.

Theoretical output

The theoretical maximum flow at rated speed is a simple function of pump displacement and speed. This is a good gauge for sizing a companion motor. This does not take into account losses due to leakage or variations in displacement.

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.

12 | © Danfoss | November 2020 BC152886482857en-000302

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

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 pressure must be maintained under all operating conditions to avoid cavitation.

Warning

Hydraulic Fluid Parameters

All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract low loop pressure from gauge readings to compute the differential.

Hydraulic fluid

Ratings and data are based on operating with hydraulic fluids containing inhibitors to prevent oxidation, rust, and foam. These fluids must possess good thermal and hydrolytic stability to prevent wear, erosion, and corrosion of the internal components.

Caution

Never mix hydraulic fluids of different types.

Temperature and viscosity

Ensure the application satisfies temperature and viscosity requirements concurrently. The data shown in the tables on Hydraulic Fluid Parameters on page 11, assume petroleum-based fluids.

High temperature limits apply at the hottest point in the transmission, which is normally the case drain. Always run the pump at or below the continuous temperature. Never exceed maximum temperature.

Durability of transmission components is not affected by cold oil, but it may affect the ability of oil to flow and transmit power. Keep temperatures 16 °C [30 °F] above the pour point of the hydraulic fluid. The minimum temperature relates to physical properties of component materials.

For maximum unit efficiency and bearing life, keep fluid viscosity in the continuous viscosity range. During brief occasions of maximum ambient temperature and severe duty cycle operation, minimum viscosity may occur. The system should encounter maximum viscosity only at cold start.

Size heat exchangers to keep the fluid temperature and viscosity within these limits. Test the system to verify that these temperature limits are not exceeded.

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Based on SI units

= (l/min)

Input torque M = (N•m)

Input power P = = (kW)

Based on US units

= (US gal/min)

Input torque M = (lbf•in)

Input power P = = (hp)

Vg • n • η

1000

Vg • ∆p

20 • π • η

Q • ∆p

600 • η

M • n • π

30 000

Vg • n • η

231

Vg • ∆p

2 • π • η

Q • ∆p

1714 • η

M • n • π 198 000

Flow

Torque

Power

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Operating Parameters

Sizing Equations

Use these equations to help choose the right pump size and displacement for your application.

Variables

SI units [US units]

Vg= Displacement per revolution cm3/rev [in3/rev] PO= Outlet pressure bar [psi] Pi= Inlet pressure bar [psi] ∆p = pO - pi (system pressure) bar [psi] n = Speed min-1 (rpm) ηv= Volumetric efficiency ηm= Mechanical efficiency ηt= Overall efficiency (ηv • ηm)

14 | © Danfoss | November 2020 BC152886482857en-000302

Reservoir

Filter

Charge

pum p

Charge relief valve

To pump case

Internal

To low pressur e

side of loop and

servo contro l

Strainer

P400162

P400163

Charge

Filter

pump

Charge relief valve

To pump case

Internal

To low pressure

side of loop and

servo control

Reservoir

Strainer

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

System Design Parameters

Fluid and Filtration

To prevent premature wear, use only new clean fluid. Use a filter capable of controlling fluid cleanliness to ISO 4406 Class 22/18/13 (SAE J1165).

Locate the filter on the inlet (suction filtration) or discharge (charge pressure filtration) side of the charge pump: 4T axial piston pumps are available with provisions for either configuration.

The selection of a filter depends on a number of factors including the contaminant ingression rate, the generation of contaminants in the system, the required fluid cleanliness, and the desired maintenance interval. Use filters that meet the above requirements of efficiency and capacity.

Filter efficiency can be measured with a Beta ratio (βX). For simple suction-filtered closed circuit transmissions and open circuit transmissions with return line filtration, a filter with a β-ratio within the range of β and closed circuits with cylinders being supplied from the same reservoir, a higher filter efficiency is recommended. This also applies to systems with gears or clutches using a common reservoir. For these systems, a charge pressure or return filtration system with a filter β-ratio in the range of β

10) or better is typically required. Because each system is unique, only a thorough testing and evaluation program can fully validate the

filtration system. Please see Design Guidelines for Hydraulic Fluid Cleanliness, BC152886482150, Technical Information for more information.

= 75 (β10 ≥ 2) or better has been found to be satisfactory. For some open circuit systems,

35-45

= 75 (β10 ≥

15-20

Filtration Configuration

Locate the filter on the inlet (Suction filtration) or discharge (Charge pressure filtration) side of the external charge pump.

Suction filtration

Charge pressure filtration, full flow

Danfoss | November 2020 BC152886482857en-000302 | 15

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

System Design Parameters

Mounting Flange Loads

Adding tandem mounted auxiliary pumps and/or subjecting pumps to high shock loads may result in excessive loading of the mounting flange. Design pump applications to stay within the allowable shock load and continuous load moments.

Shock load moment MS is the result of an instantaneous jolt to the system. Rated (continuous) load moments MR are generated by the typical vibratory movement of the application.

Estimated maximum and continuous acceleration factors for some typical applications are shown in the table.

Applications which experience extreme resonant vibrations may require additional pump support. Exceeding the allowable overhung values listed below will require additional pump support.

G-factors for sample applications

Application Continuous (vibratory)

Skid steer loader 4 10 Trencher (rubber tires) 3 8 Asphalt paver 2 6 Windrower 2 5 Turf care vehicle 1.5 4 Vibratory roller 6 10

acceleration (GR)

Maximum (shock) acceleration (GS)

Allowable overhung load moments

Rated load moment (MR) Shock load moment (MS)

1441 N•m [12750 in•lbf] 3413 N•m [30200 in•lbf]

Estimating Overhung Load Moment

MR = GR (W1L1 + W2L2 + ... +WnLn) MS = GS (W1L1 + W2L2 + ... +WnLn)

Where:

MRRated load moment N•m [lbf•in]

MSShock load moment N•m [lbf•in]

GRRated (vibratory) acceleration (G-factors: unitless)

GSMaximum shock acceleration (G-factors: unitless)

W Weight of the pump N [lbf]

L Distance from mounting flange to the center of gravity mm [in]

16 | © Danfoss | November 2020 BC152886482857en-000302

Mounting flange

Pump 1 Center of gravity

Pump 2 Center of gravity

P400164

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

System Design Parameters

Overhung load moments

Case Drain

The front and rear pumps are connected by cast passages in the housing. The charge relief valve discharges oil into the front housing. In order to provide positive housing flow thru both pumps, use of rear case drain is required. The front case drain should only be used if the pumps are used as a common drain manifold for the vehicle whereas external drain flow is brought into the rear case port and discharged out the front.

External Shaft Load and Bearing Life

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

In vehicle propulsion drives with no external loads—where the speed, pressure, and swashplate angle are often changing—normal bearing B10 (90% survival) life exceeds 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 these types of applications, we recommend a bearing life review. 4T axial piston pumps use bearings that can accept some incidental external radial and thrust loads. However, any amount of external load reduces the expected bearing life.

The allowable radial shaft loads are a function of the load position, orientation, and operating pressures of the hydraulic unit. In applications where you cannot avoid external shaft loads, minimize the impact on bearing life by orienting the load to the 0° or 180° position.

The maximum allowable radial load is calculated as: Re = Me / L Where:

L Distance from mounting flange to point of load

out

Maximum external moment

Maximum radial side load

Thrust load

Load to cylinder block kit

Danfoss | November 2020 BC152886482857en-000302 | 17

P400165

0 Re

180 Re

90 Re

270 Re

out

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

System Design Parameters

Allowable shaft loads

Displacement (cm3) 41 51

N•m [in•lbf] T

OUT

N [lbf]

Avoid thrust loads in Tin direction. If continuously applied external radial loads are 25% of the maximum allowable or more, or thrust loads

are known to occur, contact your Danfoss representative for an evaluation of unit bearing life. Use clamp-type couplings where radial shaft side loads are present.

External shaft load orientation

111 [982]

1110 [250]

90 [800]

1110 [250]

Hydraulic Unit Life

Use the table and drawing to determine maximum allowable radial loads (Re), based on the maximum external moment (Me) and the distance (L) from the mounting flange to the load.

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. High pressure, which results from high load, reduces expected life.

Design the hydraulic system to a projected machine duty cycle. Know the expected percentages of time at various loads and speeds. Ask your Danfoss representative to calculate an appropriate pressure based your hydraulic system design. If duty cycle data is not available, input power and pump displacement are used to calculate system pressure.

All pressure limits are differential pressures (referenced to charge pressure) and assume normal charge pressure.

4T axial piston pumps will meet satisfactory life expectancy if applied within the parameters specified in this bulletin. For more detailed information on hydraulic unit life see BC152886484313, Pressure and Speed Limits.

18 | © Danfoss | November 2020 BC152886482857en-000302

100

Efficienc

y —

25 50

100

Speed,% of Rated Speed

]

r [

]

[

]

[

]

P100401E

5000

4000

3000

2000

1000

System Pressur

25 50

75 100

Speed,% of Rated Speed

psi

350

bar

300

250

200

150

100

P100402E

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

System Design Parameters

Efficiency Graphs

The following performance map provides typical volumetric and overall efficiencies for 4T axial piston pumps. These efficiencies apply for all 4T axial piston pumps at maximum displacement.

Pump performance as a function of operating speed at maximum displacement*

The following performance map provides typical pump overall efficiencies at various operating parameters. These efficiencies also apply for all 4T axial piston pumps at maximum displacement.

Pump performance at select operating parameters at maximum displacement*

* Assumes viscosity in the continuous range

Danfoss | November 2020 BC152886482857en-000302 | 19

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Charge Pump

An external charge pump is required on all 4T axial piston pumps units applied in closed circuit installations to make up for internal leakage, to maintain positive pressure in the main circuit, and to replace any leakage losses from external valving or auxiliary systems.

The total charge flow requirement is the sum of the charge flow requirement of each of the components in the system. When initially sizing and selecting hydrostatic units for an applications, it is frequently not possible to have all of the information necessary to accurately evaluate all aspects of charge pump size selection. The following procedure will assist the designer in arriving at an initial charge pump selection for a typical application.

In most 4T axial piston pump applications a general guideline is that the charge pump displacement (CPG) should be equal to or greater than 10% of the total displacement (TD) of all axial piston units in the system. This rule assumes that all units are of high speed, axial piston or bent axis design.

Particular application conditions may require a more detailed review of charge pump sizing. System features and conditions that may invalidate the 10% of displacement rule include (but are not limited to):

•

Operation at low input speeds (below 1500 rpm)

•

Shock loadings

•

Excessively long system lines

•

Auxiliary flow requirements

•

Use of low speed, high torque motors

Charge Relief Valve

If a charge pump of sufficient displacement to meet the 10% of displacement rule is not available or if any of the above conditions exist which could invalidate the 10% rule, contact your Danfoss representative.

A charge pump sizing worksheet can be found in BC157786484430, Selection of Driveline Components.

Charge Pump Sizing Example:

A system consists of 4T 41cc Pump driving two Series 40 -M35 Fixed Motors:

TD = 41 + 41 + 35 +35= 152 cm

•

CPD = 10 % x TD = 15.2 cm

•

This requires a charge pump displacement of 15.2 cm3 .

The charge relief valve maintains charge pressure at a designated level. 4T axial piston pumps come with direct-acting poppet style charge relief valves. The valve setting is set at the factory. The setting is screw adjustable.

The charge pressure settings are nominal values and are based on the charge flow across the charge relief valve with a fluid viscosity of 28 mm2/s (cSt) [130 SUS] and a pump input speed of 1800 min-1(rpm). Actual charge pressure differs slightly from the nominal setting when different input speeds are used. The charge setting is a differential pressure (referenced to case pressure) and measured with the piston pump at zero swashplate angle (neutral). Charge pressure drops slightly when the pump is in stroke due to flow demands.

The charge pressure setting for pumps without an internal charge pump is set with an assumed charge flow of 38 l/min (10 US gal/min). These units must have adequate charge flow supplied to the charge inlet in order to maintain charge pressure at all times.

20 | © Danfoss | November 2020 BC152886482857en-000302

From Charge

Pump

To Low Side

of Working

Loop & Servo

Control

To Case

P100392E

High pressure side of working loop

Charge check and high pressure relief valve

Charge pressure

P100393E

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Charge Relief Valve

Caution

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

Overpressure Protection

4T axial piston pumps are available with a combination charge check and high pressure relief valve assembly. High pressure relief valves come in a range of settings as shown in the model code. You may specify individual port pressure settings. The high pressure relief valve settings are a differential pressure (referenced to charge pressure) and are set at 3.8 l/min (1 US gal/min) of flow.

We can equip pumps with charge check valves only, if high pressure relief valve protection is not necessary.

Charge Check and High Pressure Relief Valve

Caution

High pressure relief valves are for transient overpressure protection, not for continuous pressure control. Operation over relief valves for extended periods of time results 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.

Danfoss | November 2020 BC152886482857en-000302 | 21

Charge pressure

High pressure side of working loop

Charge check and high pressure relief valve

Bypass plunger

FLOW

P100394E

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Bypass Valve

4T axial piston pumps are available with an optional bypass function for use when pump shaft rotation is not possible. Use the bypass function to bypass fluid around the variable displacement pump. For example: you may move a disabled vehicle to a service location or winch it onto a trailer without operating the prime mover.

The bypass valve is integral to the charge check/high pressure relief valve assembly. Depress the plungers located in the plugs of the valve assemblies to operate the bypass function. The valves remain open until the prime mover is started. Charge pressure automatically closes them.

Charge Check and High Pressure Relief Valve with Bypass

Displacement Limiters

Caution

Damage to the hydraulic system may result from operating without charge flow. Bypass valves are for moving a machine or vehicle for very short distances at very slow speeds. They are NOT tow valves.

4T axial piston pumps are available with adjustable mechanical displacement (stroke) limiters located in the servo covers. The maximum displacement of the pump can be limited to any value from its maximum displacement to zero in either direction. The limiters are factory set slightly beyond the maximum displacement of the pump. Displacement limiters may not be suited to all applications.

Series 42 pump displacement limiters

Shaft Options

4T axial piston pumps are available with a variety of splined and tapered shaft ends. The accompanying table shows available shaft sizes and torque ratings. Maximum torque ratings are based on shaft torsional strength and assume a maximum of 200 000 load reversals.

22 | © Danfoss | November 2020 BC152886482857en-000302

¯ -0.05P

(+.000)

(-.002)

Spline Engagement for Torque

Em ax.

Mounting Flange

Dm ax.

max.

R 0.8 (.03)

max.

Coupling

min.

2.3 (.09) Cutter clearance

With

Undercut

Without

Undercut

P001614E

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Use ANSI B92.1 Class 5 mating splines for splined output shafts. 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 insure a clearance fit with the mating spline.

Shaft Availability and Torque Rating*

Shaft Max. torque Max. torque

15 tooth spline, 16/32 pitch 362 N•m [3200 in•lbf ] 192 N•m [1700 in•lbf ] 19 tooth spline, 16/32 pitch 734 N•m [6500 in•lbf ] 340 N•m [3000 in•lbf ]

* The limitations of these input shafts constrain the allowable auxiliary coupling torque.

Auxiliary Mounting Pads

Auxiliary mounting pads are available on all 4T axial piston pumps to mount auxiliary hydraulic pumps. We include a sealed (oil tight) shipping cover as standard equipment. The shipping cover seals case pressure and you can use it as a running cover if desired.

Since the auxiliary mounting pad operates under case pressure, you must use an O-ring to seal the auxiliary pump to the pad. The drive coupling is lubricated with oil from the main pump case.

Spline specifications and torque ratings are shown in the accompanying table.

All mounting pads meet SAE J744 specifications.

•

The sum of main and auxiliary pump torque must not exceed stated maximum.

•

All torque values assume a 58 RC shaft spline hardness on mating pump shaft. Maximum torque is

•

based on maximum torsional strength and 200 000 load reversals. Applications with severe vibratory or high G-force (shock) loading may require additional structural

•

support to prevent leaks or mounting flange damage. Refer to Mounting flange loads for additional information.

Auxiliary Pad*

Pad size Spline Minimum spline length

(mm [in])

SAE A 9 tooth 16/32 pitch 13.5 [0.53] 107 [950] SAE A special 11 tooth 16/32 pitch 13.5 [0.53] 147 [1300] SAE A special 13 tooth 16/32 pitch 14.2 [0.56] 248 [2200] SAE B 13 tooth 16/32 pitch 14.2 [0.56] 248 [2200]

Maximum torque (N•m [lbf•in])

* Allowable Auxiliary coupling torque is subject to limitations of the input shaft.

This drawing provides the dimensions for the auxiliary pump mounting flange and shaft. Auxiliary pump mounting flanges and shafts with these dimensions are compatible with the auxiliary mounting pads on 4T axial piston pumps. For auxiliary pad dimensions, see Auxiliary Mounting Pads on page 48.

Danfoss | November 2020 BC152886482857en-000302 | 23

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Auxiliary pump mating dimensions

Pad Size P B C D E F

SAE A mm [in] 82.55 [3.250] 8.1 [0.32] 12.7 [0.500] 44 [1.73] 15 [0.59] 13.5 [0.53] SAE B mm [in] 101.6 [4.000] 11.4 [0.45] 15.2 [0.60] 46 [1.81] 17.5 [0.69] 14.2 [0.56]

Center Coupling

The two pump shafts are connected with a center-section coupling that is a 22 tooth spline with a 24/48 pitch. The torque transmitted through the center coupling is the sum of the rear kit torque and the auxiliary pump torque. The maximum torque rating of the auxiliary pad may be reduced from the values in the above table due to center coupling limitations.

22 tooth Center-Section Coupling Torque Rating

Rating Torque in N•m [lbf•in] 22T Maximum Continuous

347 [3071]

243 [2151]

Control Selection

4T axial piston pumps use a servo control system with two types of control options. Manual Displacement Controls (MDC) are feedback controls that provide and maintain a set displacement for a given input. The MDC includes options for a Neutral Start Switch (NSS), backup alarm , and a solenoid override to neutral. Non-Feedback Proportional Hydraulic controls (NFPH) is available to control the pump without mechanical feedback.

All controls provide smooth, stepless positive control of the transmission in either direction. Optional servo supply and drain orifices are available for special response needs.

Typical Control Applications

Machine Function MDC NFPH

Roller/compactor

Asphalt paver Skid steer loader Propel Articulated loader Propel Utility tractor Propel Windrower Propel

Trencher

Ag sprayer Propel

Specialized harvesters (sod, fruit, nut, etc.)

Commercial mower Propel Rock drill Propel

Drill rig

Sweeper

Propel Vibratory drive Propel

Propel Chain drive

Propel Auxiliary drive

Drill drive Pull downe Propel Fan

24 | © Danfoss | November 2020 BC152886482857en-000302

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Typical Control Applications (continued)

Machine Function MDC NFPH

Aerial lift Propel Fork lift Propel

Brush / stump cutter

Airport vehicle Propel Dumper Propel

Propel Cutter drive

Danfoss | November 2020 BC152886482857en-000302 | 25

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Manual Displacement Control (MDC)

The Manual Displacement Control (MDC) converts a mechanical input signal to a hydraulic signal. The hydraulic signal positions the servo piston, tilting the swashplate to vary the pump’s displacement and flow direction.

The position of the swashplate is proportional to the mechanical input signal. The control has mechanical feedback that regulates the servo valve in relation to swashplate position to maintain displacement at the commanded level regardless of changes in system pressure.

The full featured 4T axial piston pumps manual control consists of two manual displacement controls with backup alarm swiches. One of the controls incorporate a neutral override (NOR) solenoid and brake release port. The other control housing drains through the first control housing to provide neutral override function.

Manual controls for use on one pump are also available and can be used in combination with another type of control on the other pump. The servo control valve has variable geometry porting to regulate swashplate response relative to input command. The control performs small displacement change commands with maximum controllability throughout the entire stroking range of the pump. It completes large displacement change commands with rapid swashplate response. Optional servo supply and drain orifices are available for special response needs.

The control also has a full over-travel spool that allows input at a faster rate than swashplate movement without damage to the control. Any swashplate position error is feed back to the servo valve for instant correction.

Features and Benefit of MDC

The MDC is a high gain control: Small movements of the control handle move the servo valve to full

•

open position porting maximum flow to the servo cylinder. The full over-travel spool design allows rapid changes in input signal without damaging the control

•

mechanism. The MDC provides a fast response with low input force.

•

Precision parts provide repeatable and accurate displacement settings.

•

Mechanical feedback maintains pump displacement regardless of changes in system pressure.

•

The operator is isolated from swashplate vibration.

•

The swashplate and servo cylinder, as well as the control valve, are spring centered so the pump

•

returns quickly to neutral in the absence of control input.

The pump returns to neutral:

if the prime mover is shut down;

•

if the external control linkage fails at the control handle;

•

if there is a loss of charge pressure.

•

26 | © Danfoss | November 2020 BC152886482857en-000302

-b -a

a b

100%

P001015E

Displacement

P100404E

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Control Input Signal

The figure and table below relate the input electrical signal to pump displacement, (swashplate position), for each coil configuration.

Pump displacement versus Electrical signal

Response Time

You can tailor the time to change from zero to maximum displacement using orifices incorporated in the gasket between the control and pump housing. Using orifices you can match swashplate response to the acceleration and deceleration requirements of your application. Verify proper orifice selection by testing.

MDC Response Time (Maximum to Maximum)

Frame size (cm3) Fast (no orifice) Medium Slow (standard)

41/51 0.6 sec 1.6 sec 2.5 sec

Neutral to maximum swashplate response is approximately 60% of the time for maximum to maximum sawashplate travel. For other response times please contact your Danfoss representative.

MDC Schematic

Danfoss | November 2020 BC152886482857en-000302 | 27

Charge Pressure

Servo Control

Valve

MDC Handle

Servo Piston

Feedback Linkage

P100403E

P100407E

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Cross-section of MDC

Control Handles

Either straight or clevis (offset) style control handles are available for the MDC. The straight style handle minimizes the overall height of the pump and control. The clevis style handle provides additional clearance between the handle and control housing and works well for clevis style linkage installations.

Maximum allowable input torque at the control handle is 17 N•m (150 lbf•in). The maximum allowable bending moment is 4 N•m (35 in•lbf ).

Pump Flow Direction with MDC

Input Shaft Rotation CW CCW

Handle of rotation CW CCW CW CCW Port A flow Out In In Out Port B flow In Out Out In High pressure servo guage port M4 M5 M4 M5

MDC Handle Options

Electric Solenoid Override to Neutral

This normally open solenoid valve (C) shunts both ends of the servo piston. This prevents the pump from stroking. When energized, the valve closes, allowing the pump to operate normally. This option is ideally suited for operator presence or auto-resume functions without prime mover shut down. This solenoid is available in 12 or 24 Vdc with 2 Amp. maximum current draw. It is available with DEUTSCH 2-way or with a Packard Weather-Pack 2-way shroud connector.

28 | © Danfoss | November 2020 BC152886482857en-000302

P400167

(from charge pump)

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Emergency Override to Neutral with Port for Brake Pressure Release

This solenoid valve (C) operates as the override to neutral above, and drains a spring-applied, hydraulically-released brake (port X7). Energizing the valve allows the pump to operate as normal, while also charging port X7 to release the brake. This option is ideally suited for emergency stop functions without prime mover shut down. The solenoid is available in 12 or 24 Vdc with 2 Amp. maximum current draw. It is available with DEUTSCH 2-way or with a Packard Weather-Pack 2-way shroud connector.

Electric Override to Neutral Specifications

Solenoid State at Override Activation De-energized

Voltage 12 or 24 Vdc Maximum Current 2 A

Hydraulic Schematic for MDC with Override Options

Danfoss | November 2020 BC152886482857en-000302 | 29

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Neutral Start Switch (NSS)

This option provides an electrical switch contact that is closed when the control handle is in its neutral (0°) position. The switch contact opens when the control handle rotates approximately 1.5° to 2° clockwise (CW) or counterclockwise (CCW) from neutral.

The switch is rated for 5 Amp. inductive load at 12 or 24 Vdc. It is available with screw terminals (no connector) or with a Packard Weather-Pack 2-way tower connector or DEUTSCH 2-way connector..

Wire the NSS in series with the engine starting circuit to ensure the pump is in neutral position before allowing the engine to start.

Neutral Start Switch Specifications

Switch Neutral Position Voltage Current Rating Neutral Play

NSS with Back-up Alarm (BUA) Switch

The BUA switch contact is open until the control handle rotates 2.6° to 3.75° from neutral. The BUA switch closes when the control handle rotates either clockwise (CW) or counterclockwise (CCW) from neutral (choose one direction only). The NSS function operates as described above.

The BUA contacts are rated for 2.5 Amp. resistive load at 12 or 24 Vdc. The NSS contacts are rated for 5 Amp. inductive load at 12 or 24 Vdc. This switch is available with screw terminals (no connector) or with a Packard Weather-Pack 4-way tower connectoror Deutsch 2-way, 4-way connector..

Wire the NSS as described above. Wire the BUA switch in series with a back-up alarm to have the alarm sound when the operator moves the pump control handle into reverse.

Closed

12 or 24 Vdc

5 A

± 2°

Backup alarm switch option

Switch Neutral Position Voltage Current Rating Alarm Direction Neutral Play

Open

12 or 24 Vdc

2.5 A

CW or CCW

± 2.6° to 3.75°

Connectors

For available connectors and dimensions, see outline drawings: Manual Displacement Control Options.

30 | © Danfoss | November 2020 BC152886482857en-000302

P100408E

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Hydraulic schematic for MDC with override options and NSS

(A) = Backup alarm switch contacts (green wire)

(closed in reverse)

(B) = Neutral start switch w/ backup alarm (C) = Electric solenoid override to neutral w/

brake release

(D) = Neutral start switch contacts (black wire)

(closed in neutral)

Danfoss | November 2020 BC152886482857en-000302 | 31

Piston centering spring

Servo piston

P100412E

P400169

X2 X1

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

Non-Feedback, Proportional Hydraulic (NFPH) Control

The Non-Feedback Proportional Hydraulic (NFPH) control is a hydraulic proportional control in which an input pressure signal directly controls the pump servo piston to achieve pump displacement.

4T pumps with NFPH control have a special servo cylinder capable of providing proportional control with a hydraulic input.

Swashplate position is proportional to the differential signal pressure at ports X1 and X2, but displacement is also dependent on pump speed and system pressure. This characteristic of non-feedback controls provides a natural power limiting function by reducing the pump swashplate angle as system pressure increases. The accompanying graph shows typical operating characteristics.

The system may require tuning through the pump orifice combinations, control pressure supply line sizing, actuation device output pressure and flow adjustments to achieve proper vehicle performance characteristics.

Pump displacement versus signal pressure

Non-feedback proportional hydraulic control schematic

Pump Flow Direction with NFPH control

Input Shaft Rotation High pressure at port: Port A flow Port B flow High servo gauge port

CW CCW

X1 X2 X1 X2

Out In In Out

In Out Out In

M4 M5 M4 M5

32 | © Danfoss | November 2020 BC152886482857en-000302

100%

15 18

1518

P001628E

Signal Dp (bar)

Dp system=345bar

Dp system=35bar

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Features and Options

NFPH pump displacement to Input signal

NFPH input signal pressure (bar)

Frame size a b c

28/32 5.5 13.7 17 38/45 5 12.75 16

The values provided in the table above are approximations at 1800 RPM and system delta pressures as indicated in the graph provided. The values are dependent on input speed and delta pressure operating conditions.

Features and Benefits of the NFPH control

Eliminates mechanical linkage for flexibility of control design

•

Power limiting characteristic reduces machine power requirements

•

Compatible with dual axis joysticks for dual path applications

•

Smooth operation

•

Connectors and Port locations

Refer to outline drawings.

Danfoss | November 2020 BC152886482857en-000302 | 33

P400170

Servo Pressure Gauge Port “M4” Port ISO 11926-1 – 9/

-18

Servo Pressure Gauge Port “M5” Port ISO 11926-1 – 9/

-18

Charge Inlet Port “M6” Port ISO 11926-1 – 7/

-14

System Port “B” Port ISO 11926-1 – 1 5/

-12

Case Drain Port “L1” Port ISO 11926-1 – 1 5/

-12 System Port “A” Port ISO 11926-1 – 1 5/

-12

System A Pressure Gauge Port “M1” Port ISO 11926-1 – 9/

-18

System B Pressure Gauge Port “M2” Port ISO 11926-1 – 9/

-18

CCW

P400171

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Manual Displacement Control (MDC)

Port Description

Port Description Sizes Port Description Sizes A System port "A" 1 5/16 - 12 M2 System "A" pressure gauge port "M1"9/16 - 18

B System Port "B" 1 5/16 - 12 M1 System "C" pressure gauge port "M1"9/16 - 18 C System Port "C" 1 5/16 - 12 M2 System "D" pressure gauge port "M2"9/16 - 18 D System Port "D" 1 5/16 - 12 M4 x2 Servo pressure gauge port "M4" L1 Case Drain Port "L1" 1 5/16 - 12 M5 x2 Servo pressure gauge port "M5"

34 | © Danfoss | November 2020 BC152886482857en-000302

/16 - 18

P400172

Servo Pressure Gauge Port “ M4”

Port ISO 11926-1 – 9/

-18

Charge Inlet Port “M6”

Port ISO 11926-1 – 7/

-14

Servo Pressure Gauge Port “ M5”

Port ISO 11926-1 – 9/

-18

System Port “D”

Port ISO 11926-1 – 1 5/

-12

Case Drain Port “L2”

Port ISO 11926-1 – 1 5/

-12

System Port “C”

Port ISO 11926-1 – 1 5/

-12

System C Pressure Gauge Port “M1”

Port ISO 11926-1 – 9/

-18

System D Pressure Gauge Port “M2”

Port ISO 11926-1 – 9/

-18

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Port Description Sizes Port Description Sizes L2 Case Drain Port "L2" 1 5/16 - 12 M6 x2 Charge inlet port "M6"

M1 System "A" pressure gauge port "M1"9/16 - 18

/8 - 14

Danfoss | November 2020 BC152886482857en-000302 | 35

[4.72]

120

APPROXIMATE CENTER

AUXILIARY MOUNTING PAD OPTION J, K, S

DISPLACEMENT LIMITER OPTION 0, N

OF GRAVITY

[4.06]

103

[1.18]

[1.52]

38.5

[1.52]

38.5

[3.03]

[3.28]

83.2

41.6 [1.64]

131.7 [5.19]

171.7 [6.76]

180.34 [7.10]

192 [7.56]

277 [10.91]

335.4 [13.20]

421.3 [16.59]

433.4 [17.06]

Charge Inlet Port “M6” Port ISO 11926-1 – 7/

-14

System Port “B” Port ISO 11926-1 – 1 5/

-12

P400173

Case Drain Port “L1” Port ISO 11926-1 – 1 5/

-12

System Port “A” Port ISO 11926-1 – 1 5/

-12

Servo Pressure Gauge Port “M4” Port ISO 11926-1 – 9/

-18

Thru

System A Pressure Gauge Port “M1” Port ISO 11926-1 – 9/

-18

System B Pressure Gauge Port “M2” Port ISO 11926-1 – 9/

-18

Ø10.8

±0.5

Servo Pressure Gauge Port “M5” Port ISO 11926-1 – 9/

-18

Neutral Adjust 17 mm HEX

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Dimensions

36 | © Danfoss | November 2020 BC152886482857en-000302

P400174

Shaft

Center Line

Section F-F

Section G-G

[4.98]

126.5

[4.98]

126.5

[1.54]

APPROXIMATE CENTER

OF GRAVITY

[3.56]

90.5

[3.19]

[5 ]

-0.002

Ø127

-0.05

[0.69 ±0.01]

Ø17.57

±0.30

THRU 6X

[1.97]

[10.87]

276.06

[1.26]

[4.31]

109.5

[3.24]

82.3

BOTH SIDES SPOT FACE

(M5)

BOTH SIDES SPOT FACE

(M4)

[3.46]

[3.50]

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Adjustable displacement limiters

Shaft rotation CW CCW

Displacement limiter side 1 2 1 2 Limited flow through port B, C A, D A, D B, C

Danfoss | November 2020 BC152886482857en-000302 | 37

Determine rotation by viewing pump from the input shaft end. Contact your Danfoss representative for specific installation drawings.

P400175

[0.87]

[0.55]

[0.5 ]

12.7

- 0.5 0

- 0.02

[14.23]

361.4

[4.31]

109.45

90°

±8° BOTH HANDLES

[4.49]

114

[1.15]

29.23

LIFTING BRACKET

2XM 10X1.5-6H Thd 16 MIN Full Thd Depth

BOTH HANDS

[10.81]

274.55

[9.93]

Section E-E

252.3

[4.72]

120

[7.56]

192

[7.01]

178

[3.03]

[1.91]

48.6

[4.46]

113.3

[4.06]

103

[1.52]

38.5

[1.52]

38.5

[0.76]

19.2

[8.36]

212.3

[4.37]

111

[13.48]

342.4

[3.46]

Charge Inlet Port “M6” Port ISO 11926-1 – 7/

-14

System Port “D” Port ISO 11926-1 – 1 5/

-12

Case Drain Port “L2” Port ISO 11926-1 – 1 5/

-12

System Port “C” Port ISO 11926-1 – 1 5/

-12

Servo Pressure Gauge Port “M4” Port ISO 11926-1 – 9/

-18

Servo Pressure Gauge Port “M5” Port ISO 11926-1 – 9/

-18

System C Pressure Gauge Port “M1” Port ISO 11926-1 – 9/

-18

System D Pressure Gauge Port “M2” Port ISO 11926-1 – 9/

-18

Charge Relief Valve

12.5 mm External Hex

Neutral Adjust 17 mm HEX

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

38 | © Danfoss | November 2020 BC152886482857en-000302

Servo Pressure Gauge Port “M4” Port ISO 11926-1 – 9/

-18

Charge Inlet Port “M6” Port ISO 11926-1 – 7/

-14

Servo Pressure Gauge Port “M5” Port ISO 11926-1 – 9/16-18

System Port “B” Port ISO 11926-1 – 1 5/

-12

Case Drain Port “L1” Port ISO 11926-1 – 1 5/

-12

System Port “A” Port ISO 11926-1 – 1 5/

-12

System A Pressure Gauge Port “M1” Port ISO 11926-1 – 9/

-18

P400176

System B Pressure Gauge Port “M2” Port ISO 11926-1 – 9/

-18

CCW CW

P400177

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Non-Feedback, Proportional Hydraulic (NFPH)

Port Description

Danfoss | November 2020 BC152886482857en-000302 | 39

Port Description Sizes Port Description Sizes A System port "A" 1 5/16 - 12 M1 System “C” pressure gauge port “M1”9/16 - 18

B System Port "B" 1 5/16 - 12 M2 System “D” pressure gauge port “M2”9/16 - 18 C System Port "C" 1 5/16 - 12 M4 x2 Servo pressure gauge port “M4” D System Port "D" 1 5/16 - 12 M5 x2 Servo pressure gauge port “M5” L1 Case Drain Port "L1" 1 5/16 - 12 M6 x2 Charge Inlet port “M6” L2 Case Drain Port "L2" 1 5/16 - 12 X1 Control Port “X1”

/16 - 18

/8 - 14

P400178

Servo Pressure Gauge Port “M4” Port ISO 11926-1 – 9/

-18

Charge Pressure Inlet Port “M6” Port ISO 11926-1 – 7/

-14

Servo Pressure Gauge Port “M5” Port ISO 11926-1 – 9/

-18

System Port “D” Port ISO 11926-1 – 1 5/

-12

Case Drain Port “L2” Port ISO 11926-1 – 1 5/

-12

System Port “C” Port ISO 11926-1 – 1 5/

-12

System C Pressure Gauge Port “M1” Port ISO 11926-1 – 9/

-18

System D Pressure Gauge Port “M2” Port ISO 11926-1 – 9/

-18

Control Port “X1” Port ISO 11926-1 – 9/

-18

Control Port “X2” Port ISO 11926-1 – 9/

-18

Control Port “X1” Port ISO 11926-1 – 9/

-18

Control Port “X2” Port ISO 11926-1 – 9/

-18

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Port Description Sizes Port Description Sizes M1 System "A" pressure gauge port "M1"9/16 - 18 X2 Control Port “X2”

M2 System "B" pressure gauge port "M2"9/16 - 18

40 | © Danfoss | November 2020 BC152886482857en-000302

P400179

[4.72]

120

APPROXIMATE CENTER

AUXILIARY MOUNTING PAD OPTION J, K, S

DISPLACEMENT LIMITER OPTION 0, N

OF GRAVITY

[4.06]

103

[1.18]

[1.52]

38.5

[1.52]

38.5

[3.03]

[3.28]

83.2

41.6 [1.64]

131.7 [5.19]

171.7 [6.76]

192 [7.56]

195.9 [7.71]

277 [10.91]

335.4 [13.20]

421.3 [16.59]

433.4 [17.06]

Charge Inlet Port “M6” Port ISO 11926-1 – 7/

-14

System Port “B” Port ISO 11926-1 – 1 5/

-12

Case Drain Port “L1” Port ISO 11926-1 – 1 5/

-12

System Port “A” Port ISO 11926-1 – 1 5/

-12

Servo Pressure Gauge Port “M5” Port ISO 11926-1 – 9/

-18

System A Pressure Gauge Port “M1” Port ISO 11926-1 – 9/

-18

System B Pressure Gauge Port “M2” Port ISO 11926-1 – 9/

-18

Servo Pressure Gauge Port “M4” Port ISO 11926-1 – 9/

-18

Thru

Ø10.8

±0.5

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Dimensions

Danfoss | November 2020 BC152886482857en-000302 | 41

Shaft

Center Line

Section F-F

Section G-G

[6.19]

157.3

[6.19]

157.3

[1.52]

38.7

APPROXIMATE CENTER OF GRAVITY

[3.56]

90.5

[3.19]

[5 ]

-0.002

Ø127

-0.05

[0.69 ±0.01]

Ø17.57

±0.30

THRU 6X

[1.97]

[9.42]

239.3

[1.26]

[5.56]

141.3

[3.24]

82.3

BOTH SIDES SPOT FACE

(M5)

BOTH SIDES SPOT FACE (M4)

[3.46]

[3.50]

P400180

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

42 | © Danfoss | November 2020 BC152886482857en-000302

P400181

Servo Pressure Gauge Port “M4” Port ISO 11926-1 – 9/

-18

Charge Inlet Port “M6” Port ISO 11926-1 – 7/

-14

Servo Pressure Gauge Port “M5” Port ISO 11926-1 – 9/

-18

Charge Relief Valve

12.5 mm External Hex

System Port “D” Port ISO 11926-1 – 1 5/

-12

Case Drain Port “L2” Port ISO 11926-1 – 1 5/

-12

System Port “C” Port ISO 11926-1 – 1 5/

-12

System C Pressure Gauge Port “M1” Port ISO 11926-1 – 9/

-18

System D Pressure Gauge Port “M2”

Port ISO 11926-1 – 9/

-18

[4.49]

114

[11.54]

293.2

[3.57]

90.8

[0.55]

[2.30]

58.5

[2.17]

[2.30]

58.5

Lifting Bracket

2XM 10X1.5-6H Thd 16 MIN Full Thd Depth

4X 127.8 [5.03]

Section A-A

[9.93]

Section E-E

252.3

[4.72]

120

[7.56]

192

[7.01]

178

[3.03]

[1.91]

48.6

[4.46]

113.3

[4.06]

103

[1.52]

38.5

[1.52]

38.5

[0.76]

19.2

[8.36]

212.3

[4.37]

111

[13.48]

342.4

[14.22]

361.4

Control Port “X1” Port ISO 11926-1 – 9/

-18

Control Port “X2” Port ISO 11926-1 – 9/

-18

Control Port “X1” Port ISO 11926-1 – 9/

-18

Control Port “X2” Port ISO 11926-1 – 9/

-18

Lifting Bracket

[0.5 ]

12.7 0

- 0.02

- 0.5

[3.46]

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Danfoss | November 2020 BC152886482857en-000302 | 43

P400182

[1.23±.004]

Ø31.24 ±0.09

[2.243]

[2.165]

[1.331±.02]

33.8±0.5

FULL SPLINE

[.11±.02]

R2.7±0.4

[1.1]

Ø27.8 MAX

19 TEETH 16/32 PITCH

[.92±.02]

23.4±0.5

FULL SPLINE

COUPLING MUST NOT PROTRUDE BEYOND THIS POINT

15 TEETH 16/32 PITCH

[1.576]

[1.518 ±.02]

38.6 ±0.5

[.998±.004]

Ø25.3 ±0.09

[.871]

Ø22.13 MAX

OPTION E

19 TOOTH SPLINE SHAFT

OPTION D

15 TOOTH SPLINE SHAFT

30° PRESSURE ANGLE

30.163 PITCH DIA FILLET ROOT SIDE FIT ANSI B92.1-1970 CLASS 5 ALSO MATES WITH FLAT ROOT SIDE FIT

30° PRESSURE ANGLE

23.813 PITCH DIA FILLET ROOT SIDE FIT ANSI B92.1-1970 CLASS 5 ALSO MATES WITH FLAT ROOT SIDE FIT

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Shaft Options

P400183

[6.33]

160.8

[5.078]

129

[4.165]

105.8

[5.078]

129

[6.33]

160.8

[4.165]

105.8

OPTION 1-6

DISPLACEMENT LIMITER

NFP SIDE 1 REAR

OPTION A-F

DISPLACEMENT LIMITER

SIDE 1 REAR

OPTION A-F

DISPLACEMENT LIMITER

SIDE 1 FRONT

OPTION 1-6 & A-F

DISPLACEMENT LIMITER

SIDE 2 FRONT

OPTION 1-6 & A-F

DISPLACEMENT LIMITER

SIDE 2 REAR

[1.559]

39.6

[2.835]

[13.559]

344.4

[1.559]

39.6

[2.835]

[13.559]

344.4

OPTION 1-6

DISPLACEMENT LIMITER

NFP SIDE 1 FRONT

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Displacement Limiter

Danfoss | November 2020 BC152886482857en-000302 | 45

P400184

BYPASS FOR SYSTEM PORT "D"

BYPASS FOR SYSTEM POR T "C"

BYPASS FOR SYSTEM PORT "B"

BYPASS FOR SYSTEM POR T "A"

[6.665]

169.3

[1.516] 2X

38.5

[3.977]

101

[3.977]

101

[8.453]

214.7

[1.516] 2X

38.5

OPTION B

LOOP BYPASS VALVE

[.394 ±.005]

Ø10.00

±0.12

28°

33°

MAX TRAVEL

MAX DISPLACEMENT

33°

28°

NEUTRAL

MAX DISPLACEMENT

MAX TRAVEL

33°

28°

[2.000±.008]

R50.8

±0.2

[1.625

±.008]

R41.28

±0.2

[1.000 ±.008]

R25.4

±0.2

MAX DISPLACEMENT

MAX TRAVEL

15 N-M MAX [11 FT-LB] MAX

[.265 ±.005]

Ø6.73 ±0.12

17 N-M MAX [150 LB-IN] MAX

MAX DISPLACEMENT

NEUTRAL

MAX TRAVEL

33°

28°

MAX DISPLACEMENT

MAX TRAVEL

33°

28°

NEUTRAL

15 N-M MAX [11 FT-LB] MAX

[2.039 ±.008]

R51.8

±0.2

[1.039

±.008]

R26.4

±0.2

17 N-M MAX [150 LB-IN] MAX

MAX TRAVEL

MAX DISPLACEMENT

[.325

±.005]

Ø8.26

±0.12

[.325 ±.005]

Ø8.26

±0.12

[2.039 ±.008]

R51.8 ±0.2

[1.260 ±.008]

R32 ±0.2

[.295 ]

+.005

-.012

7.5

+0.12

-0.3

[.312 ±.010]

7.93

±0.25

[.37±.01]

9.4 ±0.25

[7.651]

194.33 [7.305]

Pump

185.54

[7.593]

192.86 [7.247]

184.08

[7.687]

195.25

Control handle and spool: code “3”

STANDARD HANDLE

Control handle and spool: code “1”

SPECIAL HANDLE

Control handle and spool: code “2”

CLEVIS HANDLE

Pump

P400185

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

By-pass Valve

Control Modules

Manula Displacement Control (MDC) Options

OPTION A,B,X

ELECRIC NEUTRAL

OVERRIDE AND BRAKE RELEASE

FRONT PUMP

OPTION A, B, C

OPTION W, Y

NEURAL START SWITCH

AND/OR BACKUP ALARM

ELECTRICAL NEUTRAL OVERRIDE AND BRAKE RELEASE REAR PUMP

OPTION E,F

NEUTRAL START SWITCH

AND BACKUP ALARM

EXTERNAL BRAKE SUPPLY .5625-18 STR THD O-RING BOSS PER SAE J514 (BRAKE OVERRIDE OPTION ONLY)

176.4 [6.95]

274.55 [10.81]

110.3 [4.35]

144.5 [5.69]

176.4 [6.95]

87.4 [3.45]

50.8 [2.00]

EXTERNAL BRAKE SUPPLY .5625-18 STR THD O-RING BOSS PER SAE J514 (BRAKE OVERRIDE OPTION ONLY)

OPTION A, L, X

MANUAL DISPLACEMENT CONTROL

A B

Danfoss

mating parts

Kit No. K26445

(Receptacle Terminal)

Danfoss

mating parts

Kit No. K23511

(Receptacle Terminal)

Danfoss

mating parts

No .K03383

(Female Terminals)

Danfoss

mating parts

No .K03377

(Male Terminals)

Packard Weather-Pack

2-Way Connector

(Male Terminals)

Packard Weather-Pack

2-Way Connector

(Female Terminals)

Deutsch Connector

2-Way connector

(Plug Terminal)

Deutsch Connector

4-Way connector

(Plug Terminal)

OVERRIDE TO NEUTRAL

CONNECTORS

NEUTRAL START SWITCH AND BACKUP ALARM CONNECTORS

Danfoss

mating parts

Kit No. K26445

(Receptacle Terminal)

Deutsch Connector

2-Way connector

(Plug Terminal)

A B

50.8 [2.00]

P400185

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Danfoss | November 2020 BC152886482857en-000302 | 47

[4.188]

106.38

[4.188]

106.38

[3.490]

Ø88.65

[3.252 ]

+.003

Ø82.6

+0.08 0

[0.015]

R0.38 MAX

SPLINE

O-RING SEAL REQUIRED REF 82.22[3.237] I.D. X

2.62[0.103] CROSS SECTION

[0.077]

1.96

[0.29]

7.37

[16.587]

421.31

[1.73]

MAX SHAFT DEPTH

MIN 17.5 [0.69]

4X 3/

-16 UNC - 2B Thd

18 [0.71] MIN Full Thd Depth

MOUNITING FLANGE

P400187

P400188

[5.75]

146.05

[17.087]

434

[1.81]

MAX SHAFT DEPTH

[0.42]

10.67

[0.077]

1.96

[4.245]

Ø107.82

[4.002 ]

+.003

Ø101.65

+0.07 0

[0.015]

R0.38

MAX

O-RING SEAL REQUIRED REF 101.27 [3.987] I.D. X

2.62 [0.103] CROSS SECTION SPLINE

MOUNITING FLANGE

MIN 19.7 [0.78]

2X 1/

-13 UNC - 2B Thd

18 [0.71] MIN Full Thd Depth

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Auxiliary Mounting Pads

Auxiliary mounting flange and coupling options

Auxiliary mounting flange Spline pitch diameter P Number of teeth N

Option J 14.288 [0.563] 16/32 9 tooth Option K 17.463 [0.688] 16/32 11 tooth Option S 20.638 [0.813] 16/32 13 tooth

Auxiliary mounting flange and coupling options

Auxiliary mounting flange Spline pitch diameter P Number of teeth N

Option L 20.638 [0.813] 16/32 13 tooth

MOUNTING FLANGE

P400189

393.5 [15.49]

[5.748]

146

[0.077]

1.96

MIN 19.7 [0.78]

[1.71] MAX SHAFT DEPTH

43.44

[16.102]

409

[4.004

±.001]

Ø101.69

±0.038

[4.248]

Ø107.89

R0.5

MAX

SPLINE

O-RING SEAL REQUIRED

REF 101.27 [3.987] I.D. X

2.62 [0.103] CROSS SECTION

MOUNTING FLANGE

P400190

2X Ø14.4 [0.57]

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Installation Drawings

Auxiliary mounting flange and coupling options

Auxiliary mounting flange Spline pitch diameter P Number of teeth N

Option Q - -

Auxiliary mounting flange and coupling options

Auxiliary mounting flange Spline pitch diameter P Number of teeth N

Option R 20.638 [0.813] 16/32 13 tooth

Danfoss | November 2020 BC152886482857en-000302 | 49

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Model Code: A, Y, Z

Product Series

Code Description

- 4T axial piston pumps

A - Rotation

Code Description L Pump, variable displacement, CCW rotation

R Pump, variable displacement, CW rotation

Y, Z - Displacement

Code cm3/rev [in3/rev] Speed Sensing 41 BN 41cc/revolution (2.50 CU. IN.) x 2 none

51 DN 51cc/revolution (3.11 CU. IN.) x 2 none

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Model Code: FD, FX, RD, RX

FD, FX, RD, RX - Control Type

Control Type Control Description Control Features

Manual Displacement Neutral Start Switch Override to Neutral Control Handle and Spool

X = MDC, LIN, NAR DB, HF A = MDC, LIN, LF L = MDC, LIN, NAR DB, LF

(Requires Engineering Approval)

BAS(only) with CW handle rotation: A = Weather BAS(only) with CCW handle rotation: B = Weather NSS(only) : C = DEUTSCH

NSS+BAS with CW handle rotation: E = DEUTSCH NSS+BAS with CCW handle rotation:

F = DEUTSCH N = none

Integral nor with brake release in front control:

B = 12V, Deutsch X = 12V, Weather

Stand Alone nor (front): A = 24V, DEUTSCH Integral nor with brake release in front control:

W = 12V, Weather Y = 24V, Deutsch N = none

1 = Special handle with

high gain spool 2 = Clevis handle with high gain spool 3 = STD handle with high gain spool

N = No handle

Control Type Control Description Control Features

Non-Feedback

proportional

G = NFP 3 = Hydraulic N = Not Available X = Not Available

Style Input Other feature

Danfoss | November 2020 BC152886482857en-000302 | 51

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Model Code: FE, RE

( = Standard, = Optional)

FE, RE - Control Response Time

Code Description 41 51

00= Fast (No Orifice) 02= Medium 03= Slow

Code Description 41 51

50= No Orifice 52= Medium, 1mm 53= Slow, 0.8mm 55= Fast, Special 1.3mm

MDC

NFPH CONTROLS

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Model Code: FT, RT, FH, RH, FJ, RJ, FK, RK

( = Standard, = Optional)

FT, RT - Special Drive Features

Code Description 41 51 N None 1 NFPH

FH, RH - System Pressure Protection Port A and C

Code Description 41 51 NN None (Check Valve Only) 21 210 bar (3045 psi) 25 250 bar (3625 psi) 28 280 bar (4060 psi) 30 300 bar (4350 psi) 32 325 bar (4715 psi) 34 345 bar (5000 psi) 36 360 bar (5220 psi) - 38 385 bar (5585 psi) - 41 415 bar (6020 psi) -

FJ, RJ - System Pressure Protection Port B and D

FK, RK - Loop Bypass Valve

Code Description 41 51 N None B Bypass Valve

Danfoss | November 2020 BC152886482857en-000302 | 53

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Model Code: FL, RL, FM. RM

( = Standard, = Optional)

FL, RL - Displacement Limiters Side 1

Code Description 41 51

N None A Adjustable limiters set to max. displacement B Adjustable limiters set to 96% of max. displacement C Adjustable limiters set to 92% of max. displacement D Adjustable limiters set to 88% of max. displacement E Adjustable limiters set to 84% of max. displacement F Adjustable limiters set to 80% of max. displacement

MDC

Code Description 41 51

NFPH Control

0 None 1 Adjustable limiters set to max. displacement 2 Adjustable limiters set to 96% of max. displacement 3 Adjustable limiters set to 92% of max. displacement 4 Adjustable limiters set to 88% of max. displacement 5 Adjustable limiters set to 84% of max. displacement 6 Adjustable limiters set to 80% of max. displacement

FM, RM - Displacement limiters Side 2

Code Description 41 51

MDC

Code Description 41 51

NFPH Control

0 None 1 Adjustable limiters set to max. displacement 2 Adjustable limiters set to 96% of max. displacement 3 Adjustable limiters set to 92% of max. displacement

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Code Description 41 51 4 Adjustable limiters set to 88% of max. displacement 5 Adjustable limiters set to 84% of max. displacement 6 Adjustable limiters set to 80% of max. displacement

Danfoss | November 2020 BC152886482857en-000302 | 55

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Model Code: C, F, S

( = Standard, = Optional)

C - Shaft

Code Description 41 51 D 15 teeth 16/32 pitch E 19 teeth 16/32 pitch

F - Housing

Code Description 41 51 3 MDC - Standard 5 NFPH - Standard

S - Charge Pressure Relief Setting

Code Description 41 51 C 14 bar (203 psi) D 16 bar (232 psi) E 18 bar (261 psi) F 20 bar (290 psi) G 22 bar (319 psi) H 24 bar (348 psi) N None P Defeated R 14 bar (203 psi), Anti-stall T 16 bar (232 psi), Anti-stall V 18 bar (261 psi), Anti-stall W 20 bar (290 psi), Anti-stall X 22 bar (319 psi), Anti-stall Z 24 bar (348 psi), Anti-stall

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Model Code: U, G, V

( = Standard, = Optional)

U - Auxiliary Mounting Pad

Code Description 41 51 D Rev B-Pad-Special, 90 and 270 deg gear pump orient, 11 tooth, ship

E Rev B-Pad, 0 and 180 deg gear pump orient, 13 tooth, ship cover J SAE A 9T, All gear pump orientations, ship cover K SAE A 11T, All gear pump orientations, ship cover L SAE B 13T, 0 and 180 deg gear pump orientations, ship cover Q AUX Pad-none, 4T (U000Q) S AUX Pad-SAE A 13T, Ship cover, 4T (U000S) R SAE B, 13T, 0 and 180 deg gear pump orientations, ship cover T Rev B-Pad-Special, 90 and 270 deg gear pump orient, 13 tooth, ship

cover

G - Gear Pump

Code Description 41 51 N None

V - Gear Pump Orientation

Code Description 41 51 N Not Applicable

Danfoss | November 2020 BC152886482857en-000302 | 57

Technical Information

Series 42 4T Axial Piston Tandem Pumps Size 41/51

Model Code

Model Code: N, P

( = Standard, = Optional)

N - Special Hardware

Code Description 41 51 NNR None, CW rotation NNL None, CCW rotation

P - Special Feature Description (Non-Hardware)

Code Tag Text Layout Tag/

N - Black

(Standard )

N Line 1 Line 2 Line 3 Line 4 Line 5 N -

Order code (Standard)

Order code Order code Model # Model #

Logo

Danfoss Logo

Danfoss Power Solutions GmbH & Co. OHG

Krokamp 35 D-24539 Neumünster, Germany Phone: +49 4321 871 0

Danfoss Power Solutions ApS

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

Danfoss Power Solutions (US) Company

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

Danfoss Power Solutions Trading (Shanghai) Co., Ltd.

Building #22, No. 1000 Jin Hai Rd Jin Qiao, Pudong New District Shanghai, China 201206 Phone: +86 21 2080 6201

Products we offer:

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www.hydro-gear.com

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www.daikin-sauer-danfoss.com

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•

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•

valves Electric converters

•

Electric machines

•

Electric motors

•

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•

Gear pumps

•

Hydraulic integrated

•

circuits (HICs) Hydrostatic motors

•

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Orbital motors

•

PLUS+1® controllers

•

PLUS+1® displays

•

PLUS+1® joysticks and

•

pedals PLUS+1® operator

•

interfaces PLUS+1® sensors

•

PLUS+1® software

•

PLUS+1® software services,

•

support and training Position controls and

•

sensors PVG proportional valves

•

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•

systems Telematics

•

Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic and electric 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 as well as the marine sector. Building on our extensive applications expertise, we work closely with you to ensure exceptional performance for a broad range of applications. We help you and other customers around the world speed up system development, reduce costs and bring vehicles and vessels to market faster.

Danfoss Power Solutions – your strongest partner in mobile hydraulics and mobile electrification.

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

We offer you expert worldwide support for ensuring the best possible solutions for outstanding performance. And with an extensive network of Global Service Partners, we also provide you with comprehensive global service for all of our components.

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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 subsequent 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 | November 2020 BC152886482857en-000302

Danfoss 42 4T 41/51 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Series 42 warehouse

General Description

Basic Design

System Diagram

System Schematic

Technical Specifications

System Specifications

System Parameters

Hydraulic Fluid Parameters

Operating Parameters

System Requirements

System Parameters

Hydraulic Fluid Parameters

Sizing Equations

System Design Parameters

Fluid and Filtration

Filtration Configuration

Mounting Flange Loads

Estimating Overhung Load Moment

Case Drain

External Shaft Load and Bearing Life

Hydraulic Unit Life

Efficiency Graphs

Features and Options

Charge Pump

Charge Relief Valve

Charge Pump Sizing Example:

Overpressure Protection

Bypass Valve

Displacement Limiters

Shaft Options

Auxiliary Mounting Pads

Center Coupling

Control Selection

Manual Displacement Control (MDC)

Features and Benefit of MDC

Control Input Signal

Response Time

Control Handles

Electric Solenoid Override to Neutral

Emergency Override to Neutral with Port for Brake Pressure Release

Neutral Start Switch (NSS)

NSS with Back-up Alarm (BUA) Switch

Connectors

Non-Feedback, Proportional Hydraulic (NFPH) Control

Features and Benefits of the NFPH control

Connectors and Port locations

Installation Drawings

Manual Displacement Control (MDC)

Port Description

Dimensions

Non-Feedback, Proportional Hydraulic (NFPH)

Port Description

Dimensions

Shaft Options

DISPLACEMENT LIMITER

By-pass Valve

Control Modules

Auxiliary Mounting Pads

Model Code

Model Code: A, Y, Z

Model Code: FD, FX, RD, RX

Model Code: FE, RE

Model Code: FT, RT, FH, RH, FJ, RJ, FK, RK

Model Code: FL, RL, FM. RM

Model Code: C, F, S

Model Code: U, G, V

Model Code: N, P