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Series 40 Direct Displacement Pumps
User guide
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Danfoss Series 40 Direct Displacement Pumps User guide

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Technical Information
Series 40 Direct Displacement Pumps
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Technical Information
Series 40 Direct Displacement Pumps
Revision history Table of revisions
Date Changed Rev
July 2017 Removed outdated images 0703
January 2017 Minor updates 0702
July 2015 Minor edits 0701
February 2015 Danfoss layout GA
Sep 2013 Change system pressure specs FB
Feb 2010 Fix Osaka address EI
Jun 2009 Remove M25U outline drawing EH
Jul 2008 Add plug for Charge pressure construction port EG
Oct 2007 Identified A Pad and B Pad as M35 and M44 EF
Jul 2007 orrections to table - G factors for sample applications ED
Jun 2006 Corrections to maximum flow EC
May 2006 Added an illustration to page 21 EB
2 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
Technical Information
Series 40 Direct Displacement Pumps

Contents

Specifications
Design Specifications......................................................................................................................................................................5
Technical Specifications.................................................................................................................................................................5
Operating Parameters.....................................................................................................................................................................5
Options.................................................................................................................................................................................................5
Fluid Specifications..........................................................................................................................................................................6
General Information
Series 40 Family of Pumps and Motors.....................................................................................................................................7
M25 Variable Pump..........................................................................................................................................................................7
M35 Variable Pump (M44 is similar)...........................................................................................................................................8
M35/44 Pump Schematic.............................................................................................................................................................. 8
Features and Options
Key Features....................................................................................................................................................................................... 9
Options.................................................................................................................................................................................................9
Operating Parameters
Fluids.................................................................................................................................................................................................. 10
Viscosity.............................................................................................................................................................................................10
Temperature.................................................................................................................................................................................... 10
Charge Pressure..............................................................................................................................................................................10
Case Pressure...................................................................................................................................................................................10
Pressure Ratings............................................................................................................................................................................. 11
Speed Ratings..................................................................................................................................................................................11
Inlet Pressure................................................................................................................................................................................... 11
Theoretical Output........................................................................................................................................................................ 12
System Design Parameters
Sizing Equations............................................................................................................................................................................. 13
Filtration............................................................................................................................................................................................ 13
Suction filtration....................................................................................................................................................................... 13
Charge filtration........................................................................................................................................................................ 14
Redundant Braking System Requirement.............................................................................................................................14
Loop Flushing..................................................................................................................................................................................15
Reservoir............................................................................................................................................................................................15
Case Drain usage for Tandem Pumps.....................................................................................................................................15
Bearing Life and External Shaft Loading ...............................................................................................................................15
Hydraulic Unit Life......................................................................................................................................................................... 16
Mounting Flange Loads...............................................................................................................................................................17
Model Code
Model Code......................................................................................................................................................................................19
Options
Charge Pump...................................................................................................................................................................................21
Charge Pump Output Flow........................................................................................................................................................ 22
Charge Pump Power Requirements........................................................................................................................................22
Charge Relief Valve........................................................................................................................................................................22
Charge Check/High Pressure Relief Valve (HPRV).............................................................................................................. 23
Auxiliary Mounting Pads and Auxiliary Pumps................................................................................................................... 24
Shaft Options...................................................................................................................................................................................26
M25 Variable Pump.......................................................................................................................................................................27
M25 Tandem Pump.......................................................................................................................................................................28
M35/44 Variable Pump................................................................................................................................................................ 29
M35/44 Tandem Pump................................................................................................................................................................ 30
Direct Displacement Control (DDC)........................................................................................................................................ 31
External control handle requirements..............................................................................................................................31
Installation Drawings
M25 Variable Pump.......................................................................................................................................................................33
M25 Tandem Pump.......................................................................................................................................................................35
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Technical Information
Series 40 Direct Displacement Pumps
Contents
M35/44 Variable Pump................................................................................................................................................................ 37
M35/44 Tandem Pump................................................................................................................................................................ 39
Performance Data
Performance.....................................................................................................................................................................................41
Schematics
Single Pump Schematics.............................................................................................................................................................42
Tandem Pump Schematics.........................................................................................................................................................43
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Technical Information
Series 40 Direct Displacement Pumps

Specifications

Design Specifications

Product line Series 40 Pumps Pump type In-line, axial piston, variable, positive displacement pumps Direction rotation Clockwise (CW) or counterclockwise (CCW) available Installation position Discretionary, the housing must be filled with hydraulic fluid Filtration configuration Suction or charge pressure filtration Other system requirements Independent braking system, suitable reservoir and heat exchanger

Technical Specifications

Model Unit M25 PV M35 PV M44 PV M25 PT M35 PT M44 PT Pump
configuration Displacement cm3/rev
Weight kg [lb] 19 [41.5] 25 [55] 25 [55] 24 [56] 45 [99] 45 [99] Mass moment of
inertia
[in3/rev]
2
kg·m [slug·ft2]
Single variable pump Tandem variable pump
24.6 [1.50] 35.0 [2.14] 43.5 [2.65] 24.6 x 2 [1.50 x 2]
0.0018
[0.0014]
0.0033 [0.0024]
0.0032 [0.0023]
0.0037 [0.0028]
35.0 x 2 [2.14 x 2]
0.0066 [0.0048]
43.5 x 2 [2.65 x 2]
0.0064 [0.0047]

Operating Parameters

Model Unit M25 PV M35 PV M44 PV M25 PT M35 PT M44 PT Case pressure
Continuous bar [psi] 1.7 [25] Maximum bar [psi] 5.2 [75] Speed limits Rated @ max angle min-1 (rpm) 4000 3600 3300 4000 3600 3300 Maximim @ max angle min-1 (rpm) 5000 4500 4100 5000 4500 4100 Minimum min-1 (rpm) 500 500 500 500 500 500 System pressure Maximum Working bar [psi] 345
[5000]
Maximum bar [psi] 385
[5584]
Theoretical max flow at rated speed (per pump)
Inlet pressure Continuous bar absolute
Maximum bar absolute
l/min [US gal/min]
[in Hg vacuum]
[in Hg vacuum]
100 [26.0]
0.8 [6.3]
0.7 [9.2]
380 [5511] 345
[5000]
415 [6019] 415
[6019]
126 [33.4]
145 [38.3]
345 [5000]
385 [5584]
100 [26.0]
380 [5511]
415 [6019]
126 [33.4]
345 [5000]
415 [6019]
145 [38.3]

Options

Model Unit M25 PV M35 PV M44 PV M25 PT M35 PT M44 PT Type of mounting SAE B SAE B SAE B SAE B SAE B SAE B
Port connections Twin Twin Twin Twin Twin Twin
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Technical Information
Series 40 Direct Displacement Pumps
Specifications
Model Unit M25 PV M35 PV M44 PV M25 PT M35 PT M44 PT Integral charge pump
(std) Charge relief valve
setting System pressure
regulation Displacement limiters - - - - - ­Input shaft option Splined, Tapered, or Straight Key Auxiliary mounting
pad Control options DDC DDC DDC DDC DDC DDC Filtration
configuration

Fluid Specifications

Parameter Unit Minimum Continuous Maximum Viscosity mm2/sec (cSt)
Temperature °C [°F] -40 [-40] 82 [180] 104 [220] Cleanliness ISO 4406 Class 18/13 or better Filtration efficiency suction filtration β
cm3/rev [in3/rev]
bar [psi] 14.0
bar [psi] 140-345 [2030-5000]
charge filtration β
- 11.8 [0.72]
14.0
[200]
SAE A SAE A
Suction Filtration or Remote Charge Pressure Filtration
[SUS]
[200]
SAE B
7 [47]
35-44
15-20
=75 (β10≥1.5) =75 (β10≥10)
11.8 [0.72]
14.0 [200]
SAE A SAE B
- 16.4
14.0 [200]
SAE A SAE A
12-60 [70-278]
[1.00]
14.0 [200]
SAE B
1600 [7500]
16.4 [1.00]
14.0 [200]
SAE A SAE B
Ratings and data are based on operation with premium petroleum-based hydraulic fluids containing oxidation, rust, and foam inhibitors.
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Input
shaft
Auxiliary
pad
Trunnion
Charge check and
high pressure relief
valve with bypass
Charge relief valve
Swashplate
Piston
Cylinder
block
Ball bearing
Valve plate
P100 583E
Technical Information
Series 40 Direct Displacement Pumps

General Information

Series 40 Family of Pumps and Motors

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 pump + motor transmissions 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 and M44 pumps may include an integral charge pump to provide system replenishing and cooling fluid flow. 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.
For complete technical information on M46 pumps, refer to M46 Pumps Technical Information, L1001029. Series 40 motors 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. For complete technical information on Series 40 motors, refer to Series 40 Motors Technical Information, 520L0636.
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.
The M46 variable motor is available in a cartridge flange version, which is designed to be compatible with CW and CT compact planetary gearboxes. This combination provides a short final drive length for applications with space limitations.

M25 Variable Pump

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Input
shaft
Auxiliary
pad
Trunnion
Charge check and
high pressure relief
valve with bypass
Charge relief valve
Charge
pump
Swashplate
Cylinder
block
Ball bearing
Valve plate
Piston
P100 584E
S
M3
A
B
M2
M1
L1
E
L2
EE
D
No relief valve
Suction Filtration
Remote Pressure Filtration
Remote pressure filtration (no charge pump)
P100 638E
Technical Information
Series 40 Direct Displacement Pumps
General Information

M35 Variable Pump (M44 is similar)

A variable pump is shown in a hydraulic circuit with a fixed motor. The pump shown features manual displacement control. The circuit features suction filtration and heat exchanger.

M35/44 Pump Schematic

8 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
Technical Information
Series 40 Direct Displacement Pumps

Features and Options

Key Features

3 sizes of variable displacement pumps
•
3 sizes of tandem pumps
•
3 sizes of variable displacement motors
•
3 sizes of fixed displacement motors
•
Efficient axial piston design
•
Proven reliability and performance
•
Compact, lightweight
•
Worldwide sales and service
•

Options

High Pressure Relief Valve (HPRV) - A high pressure relief valve limits the system pressure to protect
the system from over-pressure.
Charge Relief Valve - The charge pressure relief valve regulates charge pressure. Displacement Limiters - Optional displacement limiters allow maximum displacement adjustment to
allow for fine tuning of the propel system.
Auxiliary Mounting Pads - Several auxiliary mounting pad options allow for adding a second pump. Input Shafts - Straight keyed, tapered keyed, and several splined shaft options are available.
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Technical Information
Series 40 Direct Displacement Pumps

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: Hydraulic Fluids and Lubricants, Technical Information, 520L0463 and,
Experience with Biodegradable Hydraulic Fluids, Technical Information,520L465.

Viscosity

Maintain fluid viscosity within the recommended range for maximum efficiency and bearing life. Minimum viscosity is acceptable only during brief occasions of maximum ambient temperature and severe duty cycle. Maximum viscosity is acceptable only at cold start: Limit speeds until the system warms up. See Danfoss publications: Hydraulic Fluids and Lubricants, Technical Information, 520L0463, and
Experience with Biodegradable Hydraulic Fluids, Technical Information, 520L465.
Fluid viscosity limits
Condition mm2/s (cSt) SUS
Minimum 7 47 Continuous 12-60 70-278 Maximum 1600 7500

Temperature

Charge Pressure

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
Minimum (intermittent, cold start) - 40° C [- 40° F] Continuous 82.2° C [180° F] Maximum 104.4° C [220° F]
All systems require a charge (positive pressure) in the low side of the system loop for proper lubrication and rotating group operation. Maintain low loop (charge) pressure at a minimum of 6 bar [87 psi] above case pressure.
Maintain case pressure within the limits shown in the table. Ensure housing is filled with hydraulic fluid.
Case pressure limits
Maximum (continuous) 1.7 bar [25 psi] Intermittent (cold start) 5.2 bar [75 psi]
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C
W
Technical Information
Series 40 Direct Displacement Pumps
Operating Parameters
Caution
Operating outside of charge and case pressure limits will damage the pump. To minimize this risk, use full size inlet and case drain plumbing, and limit line lengths.

Pressure Ratings

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.

Speed Ratings

Inlet Pressure

All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract low loop pressure from gauge readings to compute the differential.
The table, Operating Parameters in the Specifications section, gives rated and maximum speeds for each displacement. Not all displacements operate under the same speed limits. Definitions of these speed limits appear below.
Continuous speed is the maximum recommended operating speed at full power condition. Operating at or below this speed should yield satisfactory product life. Do not exceed maximum motor speed during unloaded, on-road travel over level ground.
Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces pump 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.
Achieving acceptable pump life and performance requires proper charge pump inlet design. A continuous inlet pressure of not less than 0.8 bar abs. (not more than 6.3 in. Hg vac.) is recommended. Normal pressure less than the minimum inlet pressure of 0.7 bar abs. (greater than 9.2 in. Hg vac.) indicates inadequate inlet design or a restricted filter. Pressures less than 0.7 bar abs. (greater than 9.2 in. Hg vac.) during cold start are possible, but should improve quickly as the fluid warms.
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Technical Information
Series 40 Direct Displacement Pumps
Operating Parameters
Inlet pressure
Continuous 0.8 6 Minimum 0.7 9.2 (max)

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.
bar absolute in. Hg vacuum
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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
v
1000
Vg • ∆p
20 • π • η
m
Q • ∆p
600 • η
t
M • n • π
30 000
Vg • n • η
v
231
Vg • ∆p
2 • π • η
m
Q • ∆p
1714 • η
t
M • n • π 198 000
Flow
Torque
Power
Technical Information
Series 40 Direct Displacement Pumps

System Design 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)

Filtration

Ensure fluid entering pump is free of contaminants to prevent damage (including premature wear) to the system. Series 40 pumps 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
•
Locate filter 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 strategy.
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 information, see Danfoss publication Design Guidelines for Hydraulic Fluid Cleanliness, 520L0467.

Suction filtration

The suction filter is placed in the circuit between the reservoir and the inlet to the charge pump as shown in the accompanying illustration.
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Reservoir
Filter
Charge
pump
Charge relief
valve
To pump case
To low pressure
side of loop
and servo control
Strainer
P100 588E
Reservoir
Filter
with bypass
Charge
pump
Charge relief
valve
To pump case
To Low Pressure
side of loop
and servo control
Strainer
P106 102E
W
Technical Information
Series 40 Direct Displacement Pumps
System Design Parameters
Suction filtration

Charge filtration

Provision for charge pressure filtration is available on all Series 40 pumps. The pressure filter is remotely mounted in the circuit after the charge pump, as shown in the accompanying illustration.
Filters used in charge pressure filtration circuits must be rated to at least 34.5 bar [500 psi] pressure. A 100
- 125 µm screen located in the reservoir or in the charge inlet line is recommended when using charge pressure filtration.
A filter bypass valve is necessary to prevent filter damage and to avoid contaminants from being forced through the filter media by high pressure differentials across the filter. In the event of high pressure drop associated with a blocked filter or cold start-up conditions, fluid will bypass the filter. Avoid working with an open bypass for an extended period. We recommend a visual or electrical bypass indicator. Proper filter maintenance is mandatory.
Charge filtration

Redundant Braking System Requirement

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
14 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
hydrostatic transmission, sufficient to stop and hold the vehicle or machine in the event of hydrostatic drive power loss.
Technical Information
Series 40 Direct Displacement Pumps
System Design Parameters

Loop Flushing

Closed circuit systems may require loop flushing to meet temperature and cleanliness requirements. A loop flushing valve removes hot fluid from the low pressure side of the system loop for additional cooling and filtering. Ensure the charge pump provides adequate flow for loop flushing and the loop flushing valve does not cause charge pressure to drop below recommended limits.

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 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 promote de-aeration and reduce fluid surging.

Case Drain usage for Tandem Pumps

On tandem pumps, excess flow from the charge relief valve is routed into the housing of the front pump. In order to ensure adequate case flushing, it is recommended that the rear housing drain ports be used as the case drain.
M43/M44 tandem pumps with the option of opposing port endcaps do not follow the above rule.

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 B10 (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 these types of applications, a bearing life review is recommended.
Series 40 pumps 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 applications where external shaft loads cannot be avoided, the impact on bearing life can be minimized by orienting the load to the 90 or 270 degree position.
The maximum allowable radial loads (Re), based on the maximum external moment (Me) and the distance (L) from the mounting flange to the load, may be determined from the tables below and drawings on the next page .
The maximum allowable radial load is calculated as: Re = Me / L Avoid thrust loads in either direction. If continuously applied external radial loads are 25% or more of the maximum allowable, or thrust loads
are known to occur, contact your Danfoss representative for an evaluation of unit bearing life. Optional high capacity bearings are available.
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 15
L
Re
F
B
Te
P100 594E
CCW
CW
270
Re
0
Re
90
Re
180
Re
F
b
0 Re
180 Re
90 Re 270 Re
Axis of swashplate
rotation
End view
of shaft
P100 595E
Technical Information
Series 40 Direct Displacement Pumps
System Design Parameters
Tapered output shafts or clamp-type couplings are recommended for applications where radial shaft side loads are present.
Shaft loading parameters
R
e
M
e
L Distance from mounting flange to point of load F
e
T
e
Maximum external shaft moments
Me/N•m [in·lbf] 101 [890] 121 [1075]
180° External radial shaft load
Maximum radial load Maximum external moment
Force of cylinder block Thrust load
M25 M35/44
Direction of external shaft load

Hydraulic Unit Life

Hydraulic unit life is defined as the life expectancy of the hydraulic components. It 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.
16 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
Technical Information
Series 40 Direct Displacement Pumps
System Design Parameters
All pressure limits are differential pressures (referenced to charge pressure) and assume normal charge pressure.
Series 40 pumps will meet satisfactory life expectancy if applied within the parameters specified in this bulletin. For more detailed information on hydraulic unit life see Pressure and Speed Limits, BLN-9884.

Mounting Flange Loads

Shock load moment is the result of an instantaneous jolt to the system. Continuous load moments are
generated by the typical vibratory movement of the application. Avoid excessive loading of the mounting flange such as adding tandem mounted auxiliary pumps and/or subjecting pumps to high shock loads. Design pump applications to stay within the allowable shock load moment and allowable continuous load moment.
Use the following formulas to estimate overhung load moment for multiple pump mountings: MS = GS (W1L1 + W2L2 + ... +WnLn) MC = GC (W1L1 + W2L2 + ... +WnLn) Refer to the Installation Drawings section to find pump length (L). Refer to the table Technical
Specifications in the Specifications section, to find pump weight (W). An exact measure of W will depend on the pump’s features.
The tables below show allowable overhung load moment values. If system parameters exceed these values add additional pump support.
Estimated maximum and continuous acceleration factors for some typical Series 40 applications are shown. Applications which experience extreme resonant vibrations may require additional pump support. Typical continuous (vibratory) values can vary significantly due to changes in engine and pump configuration and mounting methods.
Overhung loading parameters
M
s
M
c
G
s
G
c
W
n
L
n
Shock load moment Continuous load moment Maximum shock acceleration (Gs) Continuous (vibratory) acceleration (Gs) Weight of nth pump Distance from mounting flange to center of gravity of nth pump
Allowable overhung parameters
Frame size Continuous load moment (Mc)
N•m [in·lbf]
M25 PV 361 [3200] 617 [5470] M25 PT 361 [3200] 559 [4950] M35 PV 517 [4600] 832 [7400] M35 PT 517 [4600] 754 [6700]
Shock load moment (Ms) N•m [in·lbf]
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 17
Mounting flange
CG Pump 1
CG Pump 2
L1
L2
P100 596E
Technical Information
Series 40 Direct Displacement Pumps
System Design Parameters
Shaft loading parameters
G-factors for sample applications
Application Continuous (vibratory)
Skid steer loader 4 10 Trencher
(rubber tires) Asphalt paver 2 6 Windrower 2 5 Aerial lift 1.5 4 Turf care vehicle 1.5 4 Vibratory roller 6 10 * Applications which experience extreme resonant vibrations require addition pump support.
acceleration (Gc)
3 8
Maximum (shock) acceleration (Gs)
18 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
Displacemen t
C D E F G H J
Product Type
K L M N P R S T
M P V 0 2 5 C B A A R A G N N
A A A A A B A A B H A N N N
Displ acemen t
E F G H J
Product Type
Front Pump
C D K L M N P R
Rear Pump
Q D U X V Y Z W
S T
M P T 0 2 5 C S R A E N N
B A A A B D D D L A F F
B C A A B D D D R A F F
C N N N
Technical Information
Series 40 Direct Displacement Pumps

Model Code

Model Code

Model code modules
C: Swashplate group D: Seal group F: Rotation E: Input shaft G: Charge pump displacement H: Charge pressure relief setting J: Filtration K: Displacement limiters L: Bypass valve M: System pressure protection N: Control P: Control handle position R: Control orifice diameters S: Auxiliary mounting pad T: Special hardware
Model code modules
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 19
E: Input shaft F: Rotation G: Charge pump displacement H: Charge pressure relief setting
Technical Information
Series 40 Direct Displacement Pumps
Model Code
J: Filtration C & Q: Swashplate D: Seal group K & U: Displacement L & X: Bypass valve N & Y: Control M & V: System pressure protection P & Z: Control handle position R & W: Control orifice S: Auxiliary mounting flange T: Special hardware
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P100 589E
Technical Information
Series 40 Direct Displacement Pumps

Options

Charge Pump

Charge flow is required on all Series 40 units applied in closed circuit installations to make up for internal leakage, maintain positive pressure in the main circuit, provide flow for cooling, replace any leakage losses from external valving or auxiliary systems, and on M46 units, to provide flow and pressure for the control system.
Maintain rated charge pressure under all conditions of operation to prevent damage to the transmission.
Charge pump in series 40 - M35 PV
All Series 40 pumps (except M25 pumps) may be equipped with integral charge pumps. These charge pump sizes have been selected to meet the needs of a majority of Series 40 applications.
Many factors influence the charge flow requirements and the resulting charge pump size selection. These factors include system pressure, pump speed, pump swashplate angle, type of fluid, temperature, size of heat exchanger, length and size of hydraulic lines, control response characteristics, auxiliary flow requirements, hydraulic motor type, etc. In most Series 40 applications a general guideline is that the charge pump displacement should be equal to or greater than 10% of the total displacement of all units in the system.
The total charge flow requirement is the sum of the charge flow requirements of each of the components in the system. Use the information provided on the following pages to make a charge pump selection for a given application.
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 loading
•
Excessively long system lines
•
Auxiliary flow requirements
•
Use of low speed high torque motors
•
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 is available in Selection of Driveline Components, BLN-9885.
M25 pumps do not allow for integral charge pumps. Other Series 40 pumps are also available without charge pumps. When an integral charge pump is not used, an external charge supply is required to ensure adequate charge pressure and cooling.
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 21
90
0
75
60
45
30
15
24
0
20
16
12
8
4
l/min
US Gal/min
0 1000 2000 3000 4000
Speed min (rpm)
M35 PT
M35 PV
T101 302E
-1
0 1000 2000 3000 4000
0
1
2
3
4
5
6
0
1
2
3
4
hpkW
Speed min (rpm)
M35PT
M35PV
T101 303E
-1
Technical Information
Series 40 Direct Displacement Pumps
Options

Charge Pump Output Flow

Flow at standard charge relief setting, 70°C [160°F] inlet

Charge Pump Power Requirements

Power at standard charge relief setting, 70°C [160°F] inlet

Charge Relief Valve

An integral charge pressure relief valve provides a relief outlet for charge pressure. This valve, in effect, sets charge pressure. Flow through the valve is ported to case.
The charge relief valve for the M25, M35, and M44 PV/PT is a flat poppet style valve. The nominal charge relief setting is referenced to case pressure. It is factory set at 1800 min-1 (rpm) with
the pump in neutral position. A proper charge relief setting takes into account input speeds and control requirements.
The charge pressure setting for pumps without an internal charge pump is set with an externally supplied charge flow of 19 l/min [5 US gal/min] on pumps and 38 l/min [10 US gal/min] on tandem pumps. These units must have adequate charge flow supplied to the charge inlet in order to maintain charge pressure at all times.
22 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
Incorrect charge pressure settings may result in the inability to build required system pressure and/or inadequate loop flushing flows. Ensure correct charge pressure under all conditions of operation to maintain pump control performance.
The charge relief valve is factory set. If necessary, it can be field adjusted with shims.
M25 PV
M35 & M44 PV
Charge Relief Valve
P100 591E
C
Technical Information
Series 40 Direct Displacement Pumps
Options
Charge relief valve specs
Type Flat poppet valve Available setting 6.2-18 bar [90-260 psi] 6.2-24 bar [90-348 psi] 6.2-28.3 bar [90-410 psi] Adjustment Via shims inside of valve cartridge
*
Shimming offers adustment over a limited range, a spring change may be required to make a larger adjustment.
Charge relief valve locations
M25 M35 M44
*

Charge Check/High Pressure Relief Valve (HPRV)

Charge check and high pressure relief valves maintain circuit pressure in the proper range. The check valves allow charge flow to replenish the low pressure side of the working loop. The high pressure relief valves provide pressure protection to the high pressure side of the working loop. There are two cartridge style valves to handle each side of the working loop with flow in either direction.
High pressure relief valves are available in a range of settings. You may specify individual port pressure settings . If high pressure relief valves are not desired, pumps may be equipped with charge circuit check valves only.
Caution
High pressure relief valves are intended for transient overpressure protection and are not intended for continuous pressure control. Flow 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.
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 23
Check/high relief valve specs
Type Cartridge-style poppet valve Setting 140-345 bar (2030-5000 psi) Option Check only - no relief valve
M25 PV
M35 & M44PV
High pressure/check valve
P100 590E
Technical Information
Series 40 Direct Displacement Pumps
Options
High pressure relief valve locations

Auxiliary Mounting Pads and Auxiliary Pumps

Auxiliary mounting pads are available on all Series 40 pumps. A sealed cover is included as standard equipment on all mounting pads.
An O-ring seals the auxiliary pump mounting flange 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 auxiliary mounting pads meet SAE J744 specifications.
•
Do not exceed the maximum pump input shaft rating.
•
Applications subject to severe vibratory or high G loading require an additional structural support.
•
This is necessary to prevent leaks and possible mounting flange damage. Refer to Mounting Flange
Loads in the System Design Parameters section for additional information.
Auxiliary mounting pad specs
Internal spline size
9T 16/32P
11T 16/32P
13T 16/32P
Pad size
SAE A Continuous:
SAE A Continuous:
SAE B Continuous:
Torque rating Availability
N•m [in • lbf] M25 M35 M44
Max:
Max:
Max:
51 107
90 147
124 248
[450] [950]
[800] [1300]
[1100] [2200]
m m m
m m m
— m m
The drawing and table below show the dimensions of the auxiliary pump mounting flanges and shafts. Auxiliary pump mounting flanges and shafts with the dimensions noted are compatible with the auxiliary mounting pads on the Series 40 pumps.
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P Dia
E
max
Mounting flange
(ref
)
D
max
With
undercut
Without
undercut
C
max
B
max
0.8 [0.03] max R
2.3 [0.090] recommended cutter clearance
Coupling
F min spline engagement for full torque rating
P100 636E
Technical Information
Series 40 Direct Displacement Pumps
Options
Auxiliary pump mating dimensions mm [in.]
Pad size P B C D E F
SAE A 82.55
[32.50]
SAE B 101.60
[4.000]
6.35 [0.250]
9.65 [0.380]
12.70 [0.500]
15.2 [0.60]
58.2 [2.29]
53.1 [2.09]
15.0 [0.59]
17.5 [0.69]
13.5 [0.53]
14.2 [0.56]
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 25
M25 PV
M35 & M44 PV
B Pad
A Pad
P100 593E
M35 & M44 PV
M35 & M44 PV
Technical Information
Series 40 Direct Displacement Pumps
Options
Auxiliary mounting pads on Series 40 pumps

Shaft Options

Series 40 pumps are available with a variety of splined, straight keyed, and tapered shaft ends. Nominal shaft sizes and torque ratings are shown in the table on the next page.
Torque ratings assume no external radial loading. Continuous torque ratings for splined shafts are based on splined tooth wear, and assume the mating spline has a minimum hardness of Rc 55 and full spline depth with good lubrication.
Maximum torque ratings are based on shaft torsional strength and assume a maximum of 200,000 load reversals.
Recommended mating splines for Series 40 splined output shafts should be in accordance with ANSIB92.1 Class 5. Danfoss external splines are modified Class 5 Fillet Root Side Fit. The external splined
Major Diameter and Circular Tooth Thickness dimensions are reduced in order to assure a clearance fit with the mating spline. Other shaft options may exist. Contact your Danfoss representative for availability.
26 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
6.35 [0.250] Sq. ke
y
38.1 [1.500] long
0.38 [0.015] min. R on edges
Mounting flange
(ref.)
63.5
[2.50]
Coupling must not
protrude beyond
this surface
22.20 dia. [0.874]
2.84 max. [0.112]
7.9 [0.31]
P104 403E
7.9 [0.31]
33.32 max [1.312]
16.5 [0.65] Full spline length
18.8 [0.74] max dia
21.72 [0.855] dia.
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
Coupling must not protrude beyond this surface
Mounting flange
(ref.)
P104 404E
Technical Information
Series 40 Direct Displacement Pumps
Options

M25 Variable Pump

Code Description Torque rating Drawing
Y Ø 22.20 mm [0.874 in]
Straight keyed
Maximum torque rating N•m [lbf•in]
140 [1240] —
Continuous torque rating N•m [lbf•in]
A 13-tooth
16/32 pitch (ANSI B92.1 1970 - Class 5)
140 [1240] 85 [750]
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6.35 [0.250] sq. key
38.1 [1.500] long
0.38 [0.015] min. R on edges
Mounting flange
(ref.)
7.9 [0.31]
63.5
[2.50]
Coupling must not
protrude beyond
this surface
22.20 dia. [0.874]
2.84 max. [0.112]
P104406
7.9 [0.31]
33.32 max. [1.312]
16.5 [0.65] full spline length
21.72 [0.588] dia.
18.8 [0.74] max. dia.
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
Coupling must not protrude beyond this surface
Mounting flange
(ref.)
P104407
22.22 [0.875] Gauge dia.
2.84 [0.112] max.
24.61 [0.969]
max. Shaft dia.
3/4-16 UNF-2B th
d.
33.3 [1.311]
To gauge dim.
42.8
[1.685]
Mounting
f l
ange
(ref.)
38.1 [1.500] taper per foot per SAE J501
25.4 [1.000] nominal shaft dia. except for 24.61 [0.969] dia as shown
coupling must not protrude beyond
25.40 [1.000] max.
26.9
[1.06]
P104 405E
6.35 [0.250] Sq. key
19.05 [0.75] long
0.38 [0.015] min. R on edges
Technical Information
Series 40 Direct Displacement Pumps
Options

M25 Tandem Pump

Code Description Torque rating Drawing
K Ø 22.20 mm [0.874 in]
Straight keyed
Maximum torque rating N•m [lbf•in]
140 [1240] —
Continuous torque rating N•m [lbf•in]
S 13-tooth
16/32 pitch (ANSI B92.1 1970 - Class 5)
C Ø 25.4 mm [1.000 in]
1:8 taper (SAE J501)
140 [1240] 85 [750]
140 [1240] —
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63.5
[2.50]
Coupling must not
protrude beyond
this surface
2.85 [0.112] max.
6.35 [0.250] sq. key
38.1 [1.500] long
0.38 [0.015] min. R on edges
22.2 [0.874] dia.
7.9 [0.31]
Mounting flange
(ref.)
P104 409E
Y teeth, 16/32
30° pressure angle
fillet root side fit
per ANSI B92.1-1970
class 5
Also mates with
flat root side fit
7.9 [0.31]
Coupling must not protrude
beyond this surface
Mounting flange
(ref)
P104 410E
T
33.3 [1.31]
U
V
W dia pitch
Shaft
option
Shaft dia. Full spline Major dia. Pitch dia. No. teeth
T U V W Y
G 21.97
[0.865]
18.5 [0.73] 24.89
[0.9800
23.812
[0.9375]
15
A 18.8 [.074] 16.50.65 21.72
[0.855]
20.638
[0.8125]
13
3/4-16 UNF-2B thd.
42.8 [1.685]
1.50 in/ft per SAE
standard J501
25.4 [1.000] Nom shaft dia.
26. 9 [1.06]
22.2 [0.875] Gauge dia.
2.84 [0.112] max.
33.3 [1.311] Gauge dim.
Coupling must not
protrude beyond
25.4 [1.000] max.
Mounting flange
(ref.)
P104 411E
6.35 [0.250] Sq. key
19.05 [0.75] long
0.38 [0.015] min. R on edges
Technical Information
Series 40 Direct Displacement Pumps
Options

M35/44 Variable Pump

Code Description Torque rating Drawing
Y Ø 22.20 mm [0.874 in]
Straight keyed
Maximum torque rating N•m [lbf•in]
226 [2000] —
Continuous torque rating N•m [lbf•in]
A 13-tooth
16/32 pitch (ANSI B92.1 1970 - Class 5)
G 15-tooth
16/32 pitch (ANSI B92.1 1970 - Class 5)
N Ø 25.4 mm [1.000 in]
1:8 taper (SAE J501)
226 [2000] 124 [1100]
362 [3200] 153 [1350]
497 [4400] —
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 29
Y teeth, 16/32
30° pressure angle
fillet root side fit
per ANSI B92.1-1970
class 5
Also mates with
flat root side fit
7.9 [0.31]
Coupling must not protrude beyond this surface
Mounting flange
(ref.)
P104 418E
T
33.3 [1.31]
U
V
W dia pitch
Option A
Option G
48.9 [1.925]
1.35 [0.053]
T
V
U
33.02 [1.300]
Shaft
option
Shaft dia. Full spline Major dia. Pitch dia. No. teeth
T U V W Y
G 21.97
[0.865]
39.4 [1.55] 24.89
[0.9800]
23.812
[0.9375]
15
A 21.97
[0.865]
18.5 [0.73] 24.89
[0.9800]
23.812
[0.9375]
15
22.22 [0.875] Gauge dia.
2.84 [0.112] max.
24.61 [0.969]
max. Shaft dia.
3/4-16 UNF-2B th
d.
33.3 [1.311]
To gauge dim.
42.8
[1.685]
Mounting
f l
ange
(ref.)
38.1 [1.500] taper per foot per SAE J501
25.4 [1.000] nominal shaft dia. except for 24.61 [0.969] dia as shown
coupling must not protrude beyond
25.40 [1.000] max.
26.9
[1.06]
P104 405E
6.35 [0.250] Sq. key
19.05 [0.75] long
0.38 [0.015] min. R on edges
Coupling must not protrude beyond this surface
0.301 ± 0.017 [7.65] ± 0.43
Mounting flange REF
1.935 ± 0.025 [49.15] ± 0.5
1.26 ± 0.02 [32.1] ± 0.5
Ø 1.243 ± 0.004 [31.57] ± 0.09
1.667 [29.634] pitch diameter 30° pressure angle Fillet root side fit Also mates with flat root side fit
Max Ø 1.013 [25.7]
Input shaft option “F”
Technical Information
Series 40 Direct Displacement Pumps
Options

M35/44 Tandem Pump

Code Description Torque rating Drawing
A
15-tooth 16/32 pitch (ANSI B92.1 1970 - Class 5)
G
15-tooth 16/32 pitch (ANSI B92.1 1970 - Class 5)
Maximum torque rating N•m [lbf•in]
362 [3200] 153 [1350]
362 [3200] 153 [1350]
Continuous torque rating N•m [lbf•in]
C
Ø 25.4 mm [1.000 in]
497 [4400] —
1:8 taper (SAE J501)
F
14-tooth
499 [4416] 488 [4416] 12/24 pitch (ANSI B92.1-1996 Class 5)
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Trunnion
106 258
100%
100%
CW
Trunnion rotation
CCW
Trunnion rotation
Pu
mp
displacemen
t
Pu
mp
displacemen
t
T101 306E
Technical Information
Series 40 Direct Displacement Pumps
Options

Direct Displacement Control (DDC)

The Direct Displacement Control (DDC) can be located on either side of a Series 40 - M25, M35, or M44 pump. It provides a simple, positive method of control. Movement of the control shaft causes a proportional swashplate movement, thus varying the pump’s displacement from full displacement in one direction to full displacement in the opposite direction.
Some applications (generally vehicle propel) require a provision for non-linear control input to reduce control sensitivity near neutral. Damping or frictional forces may be necessary to produce desirable control feel.
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 fuctionality.
With no external forces applied to the swashplate trunnion, internal hydraulic forces may not return the swashplate to the neutral position under all conditions of operation.
The DDC is available on variable pumps and tandem pumps.

External control handle requirements

Maximum allowable trunnion torque is 79.1 N•m [700 in•lbf] for M25, M35, and M44. Minimum torque necessary to hold the swashplate at a zero angle for neutral is 2.3 N•m [20 in•lbf]. Maximum trunnion angle is 15° for M25 and 16° for M35 and M44.
DDC on Left Side of M35 Pump
Pump Displacement vs Swashplate Rotation
DDC input specs
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 31
Max torque Nm [in·lbf] 79.1 [700] Min torque Nm [in·lbf] 2.3 [20] Max angle M25: 15° M35/44: 16°
Technical Information
Series 40 Direct Displacement Pumps
Options
Pump flow direction
Input shaft rotation CW CCW
Trunnion location Right Left Right Left
Trunnion rotation CW CCW CW CCW CW CCW CW CCW
PV or front PV Port A Flow Out In In Out In Out Out In
Rear PT Port C (A) Fow In Out Out In Out In In Out
Fort B Flow In Out Out In Out In In Out
Port D (B) Flow Out In In Out In Out Out In
32 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
0.375-16 UNC-2B thd
19.8 [0.78 min. full t
hd.
(2) places
53.188
[2.094]
106.375 [4.188]
Running cover
SAE A Auxiliary mounting
flange
0.5 max R [0.02]
88.65 dia [3.490]
82.6 dia [3.252]
1.96 [0.077]
6.1 [0.24] min.
M min.
Y min.
Mounting flange
[ref.
]
P Pitch diameter 30 pressure angle N teeth, 16/32 pitch fillet root side fit per ANSI B92.1-1970 Class 7 (see table)
O-ring seal required
ref. 82.22 [3.237] I.D.x
2.62 [0.103] cross section
189.7 [7.47]
53.975 [2.125] (4) places
63.50 [2.500] (4) places
0.4375-14 UNC-2B thd. 19 [0.75] min. full thd. (4) places
Running cover
P100 603E
Technical Information
Series 40 Direct Displacement Pumps

Installation Drawings

M25 Variable Pump

Auxiliary mounting flange
M25PV Auxiliary flange coupling options
Auxiliary mounting flange
SAE A Option A 14.30
SAE A Option D 17.46
Spline pitch dia.PNumber of teethNShaft clearance
Y
9 34.5
[0.563]
[0.688]
11 39.6
[1.36]
[1.56]
Coupling clearance M
22.6 [0.89]
25.9 [1.02]
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Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 33
12.7 [0.50] min.
to shoulder
14.27 [0.562] dia. (2) places
73.02 [2.875] (2) places
99.1
[3.90]
112.3 [4.42]
87.4 [3.44] (2) places
88.4
[3.48]
4.57 R
[0.180]
15.24 dia. [0.600]
Control
trunnion
left side
option DL
88.4
[3.48]
both
sides
72.1 [2.84]
Case Outlets
(2) places
202.2
[7.96]
54.9
[2.16]
92.7
[3.65]
13.0
[0.51]
77.2
[3.04]
(2) System
ports and
(1) chg. inle
t
101.6 dia [4.00]
7/8-14*
case outlet L1
9.4
[0.37]
Charge pressure
relief valve
15°
max. displ.
15° max. displ.
7/16-20*
Change pressure
gauge port M3
Control trunnion right side option DR
133.6 [5.26]
170.7 [6.72]
7/8-14*
Charge pressure inlet E
7/8-14*
Port A
7/8-14* Port B
7/8-14*
case outlet
(alternate) L2
19.84 dia. [0.781]
45°
15.82 [0.623] (2) Places
Control trunion detail
CCW
CW
Bypass/check/relief valve
this side for port A
opposite side for port B
(with 5/16 internal hex)
7/16-20*
gauge port
this side for port A M1
opposite side for port B M2
W
43.2
[1.70]
43.2
[1.70]
0.8 R max. [0.03]
P100 602E
Technical Information
Series 40 Direct Displacement Pumps
Installation Drawings
Pump and control
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specified. Shaft rotation is determined by viewing pump from input shaft end.
34 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
Contact your Danfoss representative for specific installation drawings. Dimensions in mm [in]
Running co ver
4.188
[106.3]
3/8-16 UNC-2B thd.
17.8 [0.70] min. full thd. (2) places
0.5 max. R [0.02]
1.0 max. R [0.04]
88.65 di a. [3.490]
82.6 di a. [3.252]
1.96 [0.077]
7.4 [0.29] mi n.
15.2 [0.60] mi n. Y min.
Mounting flange
[ref.]
P Pitch diameter 30° pressure angl e N teeth, 16/32 pitch fillet root side fit per ANSI B92.1-1970 class 7 (see tab le)
O-ring seal required
Ref. 82.22 [3.237] I. D.x
2.62 [0.103] cross section
SAE A Auxiliary mounting
flange
318.5
[12.54]
Running cover
53.19
[2.094]
P100 612E
Technical Information
Series 40 Direct Displacement Pumps
Installation Drawings

M25 Tandem Pump

Auxiliary mounting flange
©
Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 35
12.7 [0.50] min.
to shoulder
14.27 [0.562] dia. (2) places
73.02 [2.875] (2) places
99.1
[3.90]
112.3 [4.42]
87.4 [3.44] (2) places
88.4
[3.48]
4.57 R
[0.180]
15.24 dia. [0.600]
Control
trunnions
left side
option DL
88.4 [3.48] both sides
72.1 [2.84]
(2) case outlets
211.6 [8.33]
54.9
[2.16]
249.4 [9.82]
152.4 [6.00] to C.G.
332.5
[13.09]
13.0 [0.51]
Approx.center
of gravity
77.2
[3.04]
(4) system
ports and
(1) charge
inlet
15°
max. displ.
15°
max. displ.
101.6 dia. [4.00]
7/8-14*
case outlet L1
9.4 [0.37]
Bypass/check/relief valve
this side for port C
opposite side for port D
(5/16 internal hex)
Charge pressure relief val
ve
15°
max. displ.
15° max. displ.
Bypass/check/relief valve this side for port A opposite side for port B (5/16 internal hex)
Control trunnions right side option DR
133.6 [5.26]
170.7 [6.72]
7/8-14*
Port D
7/8-14*
Charge pressure inlet E
7/8-14*
Port A
7/8-14* Port C
43.2
[1.70]
7/8-14* Port B
7/8-14* Case outlet (alternate) L2
CCW
CW
19.84 dia. [0.78]
45°
15.82 [0.623] (2) places
Control trunion detail
43.2
[1.70]
0.8 R max. [0.03]
P100 611E
Technical Information
Series 40 Direct Displacement Pumps
Installation Drawings
Pump and control
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specified. Shaft rotation is determined by viewing pump from input shaft end. Contact your Danfoss representative for specific installation drawings. Dimensions in mm [in]
36 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
0.375-16 Thd. thru (4) holes
0.500-13 Thd. thru (2) holes
SAE B Auxiliary mounting flange
Option B
73.03
[2.875]
146.05 [5.75]
10.7 min. [0.42]
1.96 [0.077]
P pitch dia. 30° pressure angle N teeth, 16/32 pitch fillet root side fit per ANSI B92.1-1970 class 5 (see table)
261.2 [10.66]
Y min.
101.65 dia. [4.002]
0.76 max. R [0.30]
0.5 max. R [0.02]
O-Ring seal required
2.62 [0.103] dia. cross section
M min.
107.82 [4.245]
Mounting flange
(ref.)
System ports
(ref.)
SAE A Auxiliary mounting flange
Options A and D
106.38
[4.188]
53.19
[2.094]
106.38 [4.188]
P pitch dia. 30° pressure angle N teeth, 16/32 pitch fillet root side fit per ANSI B92.1-1970 class 5 (see table)
7.4 min. [0.29]
1.0 max. R [0.04]
0.5 max. R [0.02]
82.6 dia. [3.252]
88.65 dia. [3.490]
O-Ring seal required
ref. 82.22 [3.237] ID x
2.62 [0.103] dia. cross section Y min.
M min.
Option A: 248.7 [10.15] Option D:264.0 [10.39]
Mounting flange
(ref.)
System ports (ref.)
53.19
[2.094]
1.96 [0.077]
90.2
[3.55]
80.4
[3.17]
(2) places
RUNNING COVER
P100 615E
Technical Information
Series 40 Direct Displacement Pumps
Installation Drawings

M35/44 Variable Pump

Auxiliary mounting flange
M35/44 PV Auxiliary mounting flange and coupling option
Auxiliary mounting flange Spline pitch dia.
©
Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 37
SAE A Option A 14.30 [0.563] 9 33.0 [1.30] 9.1 [0.36] SAE A Option D 17.46 [0.688] 11 39.1 [1.54] 9.1 [0.36] SAE B Option B 20.72 [0.813] 13 42.9 [1.69] 22.3 [0.91]
P
No. teethNShaft clearanceYCoupling clearance
M
1-5/16 - 12*
charge pump inlet S
76.2
[3.00]
(2) places
case outlets
25.4
[1.00]
Approx.center of gravity
Bypass/check/relief valve
this side for port A
opposite side for port B
(5/16 internal hex)
193.3 [7.61]
121.4 [4.78]
12.7 [0.50]
16° max. displ.
16° max. displ.
Control trunnion
left side
option DL
Control trunnion right side option DR
87.4
[3.44]
(2) Places
73.03
[2.875]
(2) Places
4.57 R
[0.180]
(4) places
15.24 dia. [0.600]
(2)places
111.8 [4.40]
14.27 dia. [0.562] (2) Places
95
[3.74]
3.3
[0.13]
125
[4.92]
35
[1.38]
1-1/16 - 12*
Case outlet L2
(Alternate)
164.6 [6.48]
1-1/16 - 12*
Port B
74.9 min. dia. [2.95]
Charge pressure
relief valve
1-1/16 - 12*
case outlet L1
239.3 [9.42]
101.6 dia. [4.000]
9.4 [0.37]
66.7
[2.625]
96.5
[3.80]
(2) places
7/8 - 14*
charge pressure
gauge port M3
(suction filter option)
9/16 - 18*
system pressure
gauge port M1
(for port A)
9/16 - 18* system pressure gauge port M2 (for port B)
7/8 - 14*
from remote filter E
(pressure filter option) or charge pressure inlet E (no charge pump option)
35.6
[1.40]
Top view
Suction filtration
Top view
Remote filtration or less charge pump
35
[1.38]
7/8 - 14*
to remote filter D
(pressure filter option)
1-1/16 - 12*
Port A
Pump
79.8
[3.14]
(2) places
Section B-B
183.4 [7.22]
203.4
[8.01]
Mounting flange
(ref.)
M35: 19.8 dia.
[0.781]
M44:23.8 dia.
[0.938]
45
M35:
15.8 [0.623] (2) places
M44:
19.0 [0.748] (2) places
M35 Control trunion detail
96.5
[3.80]
Control side
92.5
[3.64]
B
B
CCW C W
0.8 R max. [0.03]
P104 614E
Technical Information
Series 40 Direct Displacement Pumps
Installation Drawings
Pump, filtration/charge pump option, control
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specified. Shaft rotation is determined by viewing pump from input shaft end. Contact your Danfoss representative for specific installation drawings.
38 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
Dimensions in mm [in]
SAE B Auxiliary mounting flange
Option B
SAE A Auxiliary mounting flange
Options A and D
w/ charge pump
467.9 [18.42] w/o charge pump
433.1 [17.05]
73.03
[2.875]
System ports
(ref.)
146.05 [5.75]
0.500-13 Thd.
20.8 [0.82] min. full thd. (2) places
Mounting flange
(ref.)
23.1 min. [0.91]
101.65 dia. [4.002]
107.82 dia. [4.245]
0.76 max. R [0.03]
0.5 max. R [0.02]
1.96
[0.077]
10.7 min. [0.42]
P pitch di
a. O teeth, 16/32 pitch fillet root side fit per ANSI B92.1-1970 class 5
Charge pressure
relief valve
216.9 [8.54]
7/8 - 14*
charge pressure inlet E
(w/o charge pump)
Top view (without
charge pump)
Pump
84.8
[3.34]
VIEW C-C
1.0 max. R [0.04]
9.1 [0.36] min.
P pitch di a. 30° pressure angle N teeth, 16/32 pitch fillet root side fit per ANSI B92.1-1970 class 5 (see table)
0.5 max. R [0.02]
7.4 min. [0.29]
1.96
[0.077]
O-Ring seal required ref. 82.22 [3.237] ID x
2.62 [0.103] dia. cross sec tion
82.6 dia. [3.252]
88.65 dia. [3.490]
Mounting flange
(ref.)
w/ charge pump option A: 455.2 [17.92] option D: 461.3 [18.16]
w/o charge pump option A: 433.1 [16.55] option D: 426.5 [16.79]
Y min.
C
C
System ports
(ref.)
53.19
[2.094]
106.38 [4.188]
0.375-16 Thd.
17.8 [0.70] min . th d . (4) places
53.19
[2.094]
106.38 [4.188]
O-Ring seal required
ref. 101.27 [3.987] ID x
2.62 [0.103] dia. cross section
Y min.
P100 617E
Technical Information
Series 40 Direct Displacement Pumps
Installation Drawings

M35/44 Tandem Pump

Charge pump options, auxiliary mounting flanges
M35/44 PT Auxiliary mounting flange and coupling options
Auxiliary mounting flange
SAE A Option A 14.30
Spline pitch dia. P
[.563]
SAE A Option D 17.46
SAE B Option B 20.72
[.688]
[0.813]
No. teeth
Shaft clearanceYCoupling clearance
N
9 33.0
[1.30]
11 39.1
[1.54]
13 42.9
[1.69]
M
9.1 [0.36]
9.1 [.36]
22.3 [0.91]
©
Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 39
15.24 dia. [0.600]
(4) places
95
[3.74]
1-1/16 - 12* Port A
205.7 [8.10]
w/ chg. pump
193.3 [7.61]
35
[1.38]
1-1/16 - 12*
Port C
16° max.
displ.
80.3 [3.16] (4) places
Bypass/check/relief valve
this side for port C and A
opp.side for Port D and B
(5/16 internal hex)
9/16 - 18*
system pressure
guage port M3
(for port C)
25.4
[1.00]
Approx Center Of Gravity
164.6 [6.48]
247.1 [9.73]
w/ chg. pump
428.8 [16.88]
w/ chg. pump
88.9
[3.50]
66.7
[2.625]
345.3 [13.59] w/chg. pump
1-1/16 - 12*
case outlet L1
76.2
[3.00]
(2) places
case outlets
1-5/16 - 12*
charge pump inlet S
12.7 [0.50]
16° max.
displ.
16° Max.
displ.
16° Max.
displ.
1-1/16 - 12* Port B
1-1/16 - 12*
Port D
Top view
(with charge pump and
suction filtration)
7/8 - 14*
Charge pressure
gauge port E
9/16 - 18*
system pressure
gauge port M4
(for port D)
charge pressure relief valve
1-1/16 - 12*
case outlet
(alternate) L2
9/16 - 18*
system pressure
gauge port M1
(for port A)
system pressure
gauge port M2
(for port B)
(on right side)
Pump
79.8
[3.14]
(2) places
VIEW "B-B"
183.4 [7.22]
203.4 [8.01]
7/8 - 14*
from remote filter E
35.6
[1.40]
7/8 - 14*
to remote filter D
Mounting flange
(ref.)
35
[1.38]
393.7 [15.50]
w/o chg. pump
212.3 [8.36]
w/o chg. pump
310.3 [12.215]
w/o chg. pump
Left side view
(with charge pump and suction filtration)
Bottom view
(with charge pump and suction filtration)
315.5 [12.42]
w/ chg. pump
280.7 [11.05]
w/o chg. pump
45°
M35 Control trunion detail
87.4 [3.44] (2) places
4.57 R
[0.180]
(8) places
73.03 [2.875] (2) places
14.27 [0.562] (2) places
Control trunnion
left side
option DL
Control trunnion right side option DR
111.8 [4.40]
125
[4.92]
96.5
[3.80]
Control side
92.5
[3.64]
101.6 dia. [4.00]
9.4 [0.37]
74.9 min. dia. [2.95]
B
B
CCW
CW
"X"
188.7 [7.43]
w/o chg. pump
0.8 R max. [0.03]
M35: 19.8 dia.
[0.78]
M44: 23.8 dia.
[0.938]
M35:
15.8 [0.623] (2) places
M44:
19.0 [0.748] (2) places
P100 616E
Top view
(with charge pump and
remote pressure filtration)
Technical Information
Series 40 Direct Displacement Pumps
Installation Drawings
Pumps, filtration/charge pump options, control
40 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
*All ports are SAE straight thread o-ring ports per SAE J514, unless otherwise specified. Shaft rotation is determined by viewing pump from input shaft end. Contact your Danfoss representative for specific installation drawings. Dimensions in mm [in]
100
80
95
90
85
Efficienc
y -
%
0 25 50 75 100
Speed - % of rated speed
V
o
l
u
m
e
t
r
i
c
e
f
i
f
i
c
e
n
c
y
-
1
7
0
b
a
r [
25
0
0 p
s
i]
V
o
l
u
m
e
t
r
i
c
e
f
f
i
c
i
e
n
c
y
-
34
5
b
ar
[5
0
00
p
si
]
O
v
e
r
0
p
s
i
]
a
l
l
e
f
f
i
c
i
e
n
c
y
-
1
7
0
b
a
r
[
2
5
0
O
v
e
r
a
l
l
e
f
f
i
c
i
e
n
c
y
-
3
4
5
ba
r
[
5
0
0
0
p
s
i
]
T101 304E
5000
0
4000
3000
2000
1000
System pressur
e
0 25 50 75 100
Speed - % of rated speed
8
0
%
8
0
%
8
5
%
psi
345
0
270
210
140
bar
70
8
5
%
8
7
%
8
7
%
8
8
%
8
8
%
T101 305E
Technical Information
Series 40 Direct Displacement Pumps

Performance Data

Performance

The following performance graph provides typical volumetric and overall efficiencies for Series 40 pumps. These efficiencies apply for all Series 40 pumps.
Pump performance as a function of operating speed
The performance map provides typical pump overall efficiencies at various operating parameters. These efficiencies also apply for all Series 40 pumps.
Pump performance as a function of operating speed and system pressure
©
Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 41
M2
B
M1
A
L1
L2
EM3
No relief valve
P100 637E
S
M3
A
B
M2
M1
L1
E
L2
EE
D
No relief valve
Suction Filtration
Remote Pressure Filtration
Remote pressure filtration (no charge pump)
P100 638E
Technical Information
Series 40 Direct Displacement Pumps

Schematics

Single Pump Schematics

M25 PV
M35/44 PV
42 | © Danfoss | July 2017 520L0635 | BC00000106en-US0703
B
A
L1
D
L2
E
C
No Relief Valve
P100 640E
S
B
M2
M1
A
L1
E
L2
M4
D
M3
C
Suction filtration
Remote pressure filtration
Remote pressure filtration (no charge pump)
E
D
E
No Relief Valve
P100 641E
Technical Information
Series 40 Direct Displacement Pumps
Schematics

Tandem Pump Schematics

M25 PT
M35/44 PT
©
Danfoss | July 2017 520L0635 | BC00000106en-US0703 | 43
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