Technical Information
BDU Series
Hydrostatic Transmissions
www.danfoss.com
Technical Information
BDU Series Hydrostatic Transmissions
Revision history |
Table of revisions |
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Date |
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Changed |
Rev |
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November 2021 |
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Removed contents of BDP, and aligned revision number along with DAM Hub. |
0207 |
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November 2020 |
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Minor update in Hydraulic Fluid, and changed document number from 'BC00000025' and |
0104 |
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'520L0935' to 'BC152886484098' |
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December 2018 |
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Fixed Model Code "H" |
0103 |
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May 2017 |
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Fixed typo |
0102 |
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June 2016 |
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Convertd to DITA-CMS |
0101 |
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Mar 2010 |
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Correction - Drawing |
AC |
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Jan 2009 |
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Correction - Text |
AB |
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Jan 2006 |
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First edition |
AA |
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2 | © Danfoss | November 2021 |
BC152886484098en-000207 |
Technical Information |
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BDU Series Hydrostatic Transmissions |
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Contents |
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General Description |
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BDU Series Family............................................................................................................................................................................. |
5 |
Features and Benefits...................................................................................................................................................................... |
5 |
Design................................................................................................................................................................................................... |
6 |
BDU-06/10S........................................................................................................................................................................................ |
8 |
Pictorial Diagram......................................................................................................................................................................... |
8 |
System Schematic....................................................................................................................................................................... |
8 |
BDU-10L/21L/21H............................................................................................................................................................................. |
9 |
Pictorial Diagram......................................................................................................................................................................... |
9 |
System Schematic: BDU-21L................................................................................................................................................... |
9 |
System Schematic: BDU-21H................................................................................................................................................ |
10 |
Technical Specifications |
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Features and Options................................................................................................................................................................... |
11 |
Operating Parameters.................................................................................................................................................................. |
12 |
Fluid Specifications....................................................................................................................................................................... |
12 |
Efficiency........................................................................................................................................................................................... |
13 |
BDU-06S....................................................................................................................................................................................... |
13 |
BDU-10S....................................................................................................................................................................................... |
13 |
BDU-10L....................................................................................................................................................................................... |
13 |
BDU-21L/21H.............................................................................................................................................................................. |
14 |
Operating Parameters |
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Overview........................................................................................................................................................................................... |
15 |
Input Speed...................................................................................................................................................................................... |
15 |
System Pressure.............................................................................................................................................................................. |
15 |
Charge Pressure.............................................................................................................................................................................. |
15 |
Charge Inlet Pressure.................................................................................................................................................................... |
15 |
Case Pressure................................................................................................................................................................................... |
16 |
Hydraulic Fluids.............................................................................................................................................................................. |
16 |
Temperature and Viscosity......................................................................................................................................................... |
16 |
System Design Parameters |
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Fluid and Filtration........................................................................................................................................................................ |
17 |
Reservoir............................................................................................................................................................................................ |
17 |
Control Shaft Force........................................................................................................................................................................ |
17 |
Independent Braking System.................................................................................................................................................... |
17 |
Features and Options |
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Shaft Load......................................................................................................................................................................................... |
18 |
Shaft Options................................................................................................................................................................................... |
18 |
Shaft Options : BDU-06S/10S/10L............................................................................................................................................ |
19 |
Shaft Options : BDU-21L/21H.................................................................................................................................................... |
20 |
Bypass Valve..................................................................................................................................................................................... |
21 |
High Pressure Relief Valve (hprv) and Charge Check (Overpressure Protection)................................................... |
21 |
Charge Check Valve with Orifice.............................................................................................................................................. |
23 |
Charge Check with Orifice.......................................................................................................................................................... |
24 |
Optional Integrated Reservoir................................................................................................................................................... |
25 |
Filter.................................................................................................................................................................................................... |
25 |
Fan....................................................................................................................................................................................................... |
26 |
Component Selection |
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Maximum System Pressure........................................................................................................................................................ |
27 |
Input Power...................................................................................................................................................................................... |
28 |
Unit Life.............................................................................................................................................................................................. |
29 |
Model Code |
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BDU : Model Code (A - B - C - D - E).......................................................................................................................................... |
31 |
BDU : Model Code (F - G)............................................................................................................................................................. |
32 |
BDU : Model Code (H - J - K)........................................................................................................................................................ |
33 |
Recommended Installation and Maintenance |
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© Danfoss | November 2021 |
BC152886484098en-000207 | 3 |
Technical Information |
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BDU Series Hydrostatic Transmissions |
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Contents |
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Housing Installation...................................................................................................................................................................... |
34 |
Shaft Installation............................................................................................................................................................................. |
34 |
Start Up Procedure........................................................................................................................................................................ |
34 |
Operation.......................................................................................................................................................................................... |
34 |
Maintenance.................................................................................................................................................................................... |
34 |
Installation Drawings |
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BDU-06S : Ports and Dimensions.............................................................................................................................................. |
35 |
BDU-06S : Control Arm Location.............................................................................................................................................. |
36 |
BDU-06S : Motor Shaft.................................................................................................................................................................. |
36 |
BDU-10S/10L : Ports and Dimensions..................................................................................................................................... |
37 |
BDU-10S/10L : Control Arm Location..................................................................................................................................... |
38 |
BDU-10S/10L : Motor Shaft......................................................................................................................................................... |
39 |
BDU-10S : Shaft Configuration.................................................................................................................................................. |
40 |
BDU-10L : Shaft Configuration and Charge Pumps Displacement.............................................................................. |
41 |
BDU-21L/21H : Ports and Dimensions.................................................................................................................................... |
42 |
BDU-21L/21H : Control Arm Location..................................................................................................................................... |
43 |
BDU-21L/21H : Motor Shaft........................................................................................................................................................ |
44 |
BDU-21L/21H : Shaft Configuration and Charge Pump Displacement...................................................................... |
45 |
Optional Fan.................................................................................................................................................................................... |
47 |
4 | © Danfoss | November 2021 |
BC152886484098en-000207 |
Technical Information
BDU Series Hydrostatic Transmissions
The BDU transmission is a “ Z” style transmission with a variable displacement pump and a fixed displacement motor. The variable displacement pump features a cradle swashplate with a direct proportional displacement control. Reversing the direction of tilt of the swashplate reverses the flow of oil from the pump and thus reverses the direction of the motor output rotation. The fixed displacement motor uses a fixed swashplate. The pump and motor are of the axial piston design and utilize sphericalnosed pistons which are held against a thrust bearing by internal compression springs. The fluid supply for the BDU-10L/21L/21H transmission is contained in an external reservoir and passes through an external filter prior to entering the transmission and feeding the fixed displacement gerotor charge pump. Excess fluid in the charge circuit is discharged over the charge relief valve back to the charge pump inlet. Constant flow across a small fixed orifice connecting the charge circuit to the transmission housing supplements the cooling flow.
The BDU-06S/10S transmission has a self-contained fluid supply and an integral filter. The fluid is forced through the filter by positive “head” on the fluid in the housing reservoir with an assist by the negative pressure created in the pump pistons as they create a vacuum. Charge check valves in the center section are used to control the makeup flow of fluid to the low pressure side of the loop. A spool type bypass valve is utilized in the transmission to permit moving the vehicle over short distances at low speeds without starting the engine.
•A complete transmission family to meet the needs of small vehicle application.
•3 Transmission Frame Sizes: 6, 10, 21
•PTO Capability on “Z” Style Transmission
•Cost Effective, Compact, Lightweight Design
•Low Noise
•High Efficiency
•Worldwide Sales and Service
© Danfoss | November 2021 |
BC152886484098en-000207 | 5 |
Technical Information
BDU Series Hydrostatic Transmissions
General Description
Cross-Section (BDU-10S) |
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1 |
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16 |
2 |
15 |
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3 |
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14 |
4 |
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5 |
13 |
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12 |
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11 |
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10 |
6 |
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8 |
9 |
7 |
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P400202 |
1. Tank |
7. Spool type bypass valve |
13. Shaft seal |
2. Built-in filter |
8. Cylinder block |
14. Input shaft |
3. Spring |
9. Piston |
15. Cooling fan |
4. Center section |
10. Thrust bearing |
16. Cradle swash plate |
5. Output shaft |
11. Housing |
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6. Spring |
12. Ball bearing |
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6 | © Danfoss | November 2021 |
BC152886484098en-000207 |
Technical Information
BDU Series Hydrostatic Transmissions
General Description
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1 |
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20 |
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2 |
2 |
6 |
19 |
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18 |
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7 |
17 |
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8 |
16 |
9
15
10 |
3 |
11 |
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14 |
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5 |
12 |
13 |
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4 |
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P400203
1. Suction Circuit |
8. Charge Relief |
15. Ball Bearing |
2. Working Loop |
9. Charge Circuit |
16. Shaft Seal |
3. Charge Check Valve |
10. Output Shaft |
17. Input Shaft |
4. Spool Type Bypass Valve |
11. Center Section |
18. Cradle Swash Plate |
5. Center Section |
12. Cylinder Block |
19. Piston |
6. Suction Port |
13. Thrust Bearing |
20. Spring |
7. Charge Pump |
14. Housing |
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© Danfoss | November 2021 |
BC152886484098en-000207 | 7 |
Technical Information
BDU Series Hydrostatic Transmissions
General Description
BDU-06/10S
BDU-06S, BDU-10S
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Bypass |
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Valve |
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Cylinder |
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Cylinder Block |
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Block |
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Check Valve |
Assembly |
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Input |
Assembly |
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Output |
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Shaft |
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Shaft |
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Variable |
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Swashplate |
Variable |
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Fixed |
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Displacement |
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Check Valve |
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Swashplate |
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Pump |
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Fixed |
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Displacement |
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Motor |
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BDU |
Reservor |
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Housing |
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Working Loop |
Working Loop |
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B uilt-In |
(high pressure) |
(low pressure) |
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Filter |
Suction Line |
Case Drain Fluid |
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(BDU-10S) |
P400204 |
Control Shaft “b” |
Ø0.7 |
Ø0.8 |
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1 |
2 |
3 |
Control Shaft “a” |
ø0.7 |
ø0.8 |
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Hydraulic Circuit |
1 |
2 |
3 |
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P400205
1.Ball Check Valve, Option Code. : BB
2.Check Valve with Ø0.7 Orifice, Option Code : 07
3.Check Valve with Ø0.8 Orifice, Option Code : 08
8 | © Danfoss | November 2021 |
BC152886484098en-000207 |
Technical Information
BDU Series Hydrostatic Transmissions
General Description
BDU-10L/21L/21H
BDU-10L, BDU-21L, BDU-21H (part of pump)
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Bypass |
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Valve |
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Cylinder |
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Check Valve |
Cylinder Block |
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Block |
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Input |
Assembly |
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Charge |
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Assembly |
Output |
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Pump |
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Shaft |
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Shaft |
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Variable |
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Swashplate |
Variable |
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Fixed |
Fixed |
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Cooling |
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Check Valve |
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Displacement |
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Displacement |
Swashplate |
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Pump |
Orifice |
Charge |
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Motor |
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Relief |
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Valve |
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Reservor |
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Working Loop |
Working Loop |
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(high pressure) |
(low pressure) |
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Filter |
Suction Line |
Case Drain Fluid |
P400206 |
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BDU-21L |
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Control Shaft “b” |
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Ø1.0 |
Ø1.2 |
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1 |
2 |
3 |
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Ø0.8 |
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Control Shaft “a” |
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Ø1.0 |
Ø1.2 |
Suction Port |
Drain Port |
Hydraulic Circuit |
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1 |
2 |
3 |
P400207
1.Ball Check Valve, Option Code. : BB
2.Check Valve with Ø1.0 Orifice, Option Code : 10
3.Check Valve with Ø1.2 Orifice, Option Code : 12
© Danfoss | November 2021 |
BC152886484098en-000207 | 9 |
Technical Information
BDU Series Hydrostatic Transmissions
General Description
BDU-21H
Control Shaft “b”
20.6MPa |
17.2MPa |
13.7MPa |
20.6MPa |
20.6MPa |
ø0.85 |
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ø0.7 |
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×2 |
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1 |
2 |
3 |
4 |
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5 |
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Ø0.8 |
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20.6MPa |
17.2MPa |
13.7MPa |
20.6MPa |
20.6MPa |
ø0.85 |
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Control Shaft “a” |
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ø0.7 |
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Suction Port |
Drain Port |
Hydraulic Circuit |
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×2 |
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1 |
2 |
3 |
4 |
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5 |
P400208
1.Check Valve with Relief Valve, Option Code. : R0
2.Check Valve with Relief Valve, Option Code. : R1
3.Check Valve with Relief Valve, Option Code. : R2
4.Check Valve with Relief Valve and Ø0.7 Twin Orifice, Option Code. : RA
5.Check Valve with Relief Valve and Ø0.85 Orifice, Option Code. : RB
10 | © Danfoss | November 2021 |
BC152886484098en-000207 |
Technical Information
BDU Series Hydrostatic Transmissions
Features |
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Unit |
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Product Type & Frame |
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BDU-06S |
BDU-10S |
BDU-10L |
BDU-21L |
BDU-21H |
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Displacement |
cm3 [in3] |
6 |
10 |
10 |
21 |
21 |
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[0.37] |
[0.61] |
[0.61] |
[1.28] |
[1.28] |
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Pump |
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Swashplate Angle |
degree |
15 |
15 |
15 |
15 |
15 |
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Control Shaft |
degree |
15 |
21 |
21 |
22 |
22 |
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Displacement |
cm3 [in3] |
6 |
10 |
10 |
21 |
21 |
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Motor |
[0.37] |
[0.61] |
[0.61] |
[1.28] |
[1.28] |
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Swashplate Angle |
degree |
15 |
15 |
15 |
15 |
15 |
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Charge Pump Displacement |
cm3 [in3] |
NA |
NA |
1.9 |
2.1 |
3.0 |
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[0.12] |
[0.13] |
[0.18] |
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Rated |
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3000 |
3000 |
3600 |
3600 |
3600 |
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Output Speed |
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min-1 |
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Maximum |
3200 |
3200 |
3800 |
3800 |
3800 |
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(intermittent) |
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Maximum Output Torque (Theoretical) |
Nm [lbf•in] |
9.8 |
23.4 |
23.4 |
49.2 |
72.1 |
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[87] |
[208] |
[208] |
[436] |
[639] |
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Input Power (Maximum) |
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kW [ps] |
1.1 |
2.2 |
3.7 |
7.4 |
11.0 |
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[1.5] |
[3.0] |
[5.0] |
[10.0] |
[15.0] |
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Weight |
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kgf [lbs] |
4 |
6.3 |
6.5 |
10 |
10 |
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[9] |
[14] |
[14] |
[22] |
[22] |
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Control Torque Required to Stroke Pump |
Nm [lbf•in] |
8.8 |
19.6 |
19.6 |
22.5 |
24.5 |
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(Maximum) |
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[78] |
[174] |
[174] |
[200] |
[217] |
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Mounting |
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See Installation Drawings |
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Rotation |
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Clockwise or Counterclockwise |
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Suction/Oil Tank Port (SAE O-ring Boss) |
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7/8-14 UNF |
7/16-20 UNF |
9/16-18 UNF |
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Other ports |
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See Installation Drawings |
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Shaft |
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See Installation Drawings |
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Bypass Valve |
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OP |
STD |
STD |
STD |
STD |
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Neutral Valve/Orifice |
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NA/NA |
NA/OP |
NA/OP |
OP/OP |
OP/OP |
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High Pressure Relief Valve |
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NA |
NA |
NA |
NA |
STD |
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Filtration |
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W/O |
built-in |
External |
External (Option, Integrated) |
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Reservoir |
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Integrated |
Integrated |
External |
External |
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Space for the oil in the housing |
cm3 |
450 |
550 |
550 |
700 |
700 |
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SAE J1926-1 / ISO 11926-1
© Danfoss | November 2021 |
BC152886484098en-000207 | 11 |
Technical Information
BDU Series Hydrostatic Transmissions
Technical Specifications
Parameter |
Unit |
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Product Type & Frame |
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BDU-06S |
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BDU-10S |
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BDU-10L |
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BDU-21L |
BDU-21H |
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Input Speed |
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Minimum |
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1000 |
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600 |
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min-1 |
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Rated |
3000 |
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3600 |
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Maximum |
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3200 |
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3800 |
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System Pressure |
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Maximum Working |
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105 |
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150 |
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210 |
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bar |
[1530] |
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[2185] |
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[3059] |
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Maximum |
[psi] |
150 |
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175 |
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210 |
245 |
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[2185] |
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[2549] |
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[3059] |
[3569] |
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Charge Pressure |
bar |
NA |
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3 [44] - 5 [73] |
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[psi] |
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Charge Inlet Pressure |
bar |
NA |
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0.8 [12] abs |
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[psi] |
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||||
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Case Pressure |
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Rated |
bar |
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0.3 [4] |
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Maximum (Cold Start) |
[psi] |
|
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0.7 [10] |
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Features |
|
Units |
BD Series |
||
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Minimum |
mm2/sec. |
7 |
[49] |
|
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Viscosity |
Continuous |
12-60 |
[66-280] |
||
[ SUS] |
|||||
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Maximum |
|
1600 [7500] |
||
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Minimum |
|
-10 [14] |
||
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Temperature |
Maximum Continuous |
°C [°F] |
82 |
[180] |
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Maximum |
|
104 [219] |
||
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12 | © Danfoss | November 2021 |
BC152886484098en-000207 |
Technical Information
BDU Series Hydrostatic Transmissions
Technical Specifications
Input speed: 3000 min-1, Oil temperature: 50 °C, Full Displacement
BDU-06S
Efficiency (ηv:Volumetric, ηm:Mechanial, ηt:Overall)
<![endif]>Efficiency %
100 |
|
|
90 |
|
|
80 |
|
|
70 |
|
|
60 |
|
|
50 |
|
|
40 |
|
|
30 |
|
|
20 |
|
|
10 |
|
|
0 |
5 |
7 |
3 |
||
|
Theoretical Output Torpue |
Nm |
<![endif]>Output Torque Nm
10 |
|
|
|
|
|
|
|
40% 45% 50% 55% 60% 65% |
|
70% |
|
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||
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|||
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70% |
|
5 |
|
|
|
|
65% |
|
|
|
|
|
|
60% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
55% |
|
|
|
|
|
|
|
|
|
|
|
40% |
45% |
|
|
50% |
|
|
|
|
|
|
|
|
|
|
0 |
1000 |
|
|
2000 |
3000 |
||
|
Output Speed |
min -1 |
P400210 |
BDU-10S
100 |
|
|
|
|
|
|
|
|
|
|
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|
|
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|
|
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||
|
90 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
80 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
70 |
|
|
|
|
|
|
|
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|
|
<![if ! IE]> <![endif]>% |
60 |
|
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|
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|
|
|
|
|
|
||
50 |
|
|
|
|
|
|
|
|
|
|
<![if ! IE]> <![endif]>Efficiency |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
40 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
30 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
20 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 |
|
|
|
|
|
|
|
|
|
|
0 |
|
(ηv:Volumetric, ηm |
:Mechanial, |
ηt:Overall) |
|
||||
Efficiency |
|
|||||||||
|
|
5 |
9 |
11 |
13 |
17 |
||||
|
|
|
|
Theoretical Output Torpue |
Nm |
|
|
BDU-10L
Efficiency (ηv:Volumetric, ηm:Mechanial, ηt:Overall)
|
100 |
|
|
|
|
|
|
|
|
|
|
|
90 |
|
|
|
|
|
|
|
|
|
|
|
80 |
|
|
|
|
|
|
|
|
|
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|
70 |
|
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|
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|
|
<![if ! IE]> <![endif]>% |
60 |
|
|
|
|
|
|
|
|
|
|
<![if ! IE]> <![endif]>Efficiency |
50 |
|
|
|
|
|
|
|
|
|
|
40 |
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
30 |
|
|
|
|
|
|
|
|
|
|
|
20 |
|
|
|
|
|
|
|
|
|
|
|
10 |
|
|
|
|
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0 |
|
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|
|
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|
|
|
5 |
5 |
7 |
9 |
11 |
13 |
15 |
16 |
18 |
20 |
22 |
|
|
|
Theoretical Output Torpue |
Nm |
|
|
|
|
20 |
40% |
45% 50% |
55% |
60% |
65% |
|
70% |
73% |
|
<![if ! IE]> <![endif]>Nm |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
73% |
|
||
|
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|
|
|
|
|
|
||
<![if ! IE]> <![endif]>Torque |
10 |
|
|
|
|
|
|
|
70% |
|
|
|
|
|
|
|
|
|
|
|
|
<![if ! IE]> <![endif]>Output |
|
|
|
|
|
|
|
|
65% |
|
|
|
|
|
|
|
|
55% |
60% |
|
|
|
|
|
|
|
40% |
|
45% |
|
50% |
|
|
|
|
|
|
|
|
|
|
|
|
|
0 |
1000 |
|
|
2000 |
3000 |
||||
|
|
|
Output Speed min -1 |
P400211 |
|
20 |
40% |
45% 50% |
55% |
60% |
65% |
|
70% |
73% |
|
<![if ! IE]> <![endif]>Nm |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
73% |
|
||
|
|
|
|
|
|
|
|
|
||
<![if ! IE]> <![endif]>Torque |
10 |
|
|
|
|
|
|
|
70% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<![if ! IE]> <![endif]>Output |
|
|
|
|
|
|
|
|
65% |
|
|
|
|
|
|
|
|
55% |
60% |
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
40% |
|
45% |
|
50% |
|
|
|
|
|
|
|
|
|
|
|
|
|
0 |
1000 |
|
|
2000 |
3000 |
||||
|
|
|
Output Speed |
min -1 |
P400212 |
© Danfoss | November 2021 |
BC152886484098en-000207 | 13 |
Technical Information
BDU Series Hydrostatic Transmissions
Technical Specifications
|
|
BDU-21L/21H |
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
Efficiency (ηv:Volumetric, ηm:Mechanial, ηt:Overall) |
|
|
|
|||||||||||
100 |
|
|
|
|
|
|
|
|
|
|
|
|
|
50 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
90 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
80 |
|
|
|
|
|
|
|
|
|
|
|
|
|
40 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
70 |
|
|
|
|
|
|
|
|
|
|
|
|
<![if ! IE]> <![endif]>Nm |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
<![if ! IE]> <![endif]>Efficiency% |
60 |
|
|
|
|
|
|
|
|
|
|
|
|
30 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
50 |
|
|
|
|
|
|
|
|
|
|
|
|
<![if ! IE]> <![endif]>TorqueOutput |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
40 |
|
|
|
|
|
|
|
|
|
|
|
|
20 |
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
30 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
20 |
|
|
|
|
|
|
|
|
|
|
|
|
|
10 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
10 |
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
11 |
23 |
34 |
46 |
57 |
65 |
|
0 |
||||||||
|
|
|
|
Theoretical Output Torpue |
Nm |
|
|
|
|
|
40% 45% |
50% |
55% |
|
60% |
65% |
|
70% |
|
75% |
|
|
|
|
|
|
|
|
|
|
|
|
75% |
|
|
|
|
|
|
|
|
|
|
|
70% |
|
|
|
|
|
|
|
|
|
|
|
65% |
|
|
|
|
|
|
|
|
|
55% |
60% |
|
|
|
|
40% |
|
|
|
|
|
|
|||
|
|
|
45% |
|
|
|
50% |
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1000 |
|
|
2000 |
3000 |
||||
|
|
Output Speed |
min -1 |
|
P400213 |
14 | © Danfoss | November 2021 |
BC152886484098en-000207 |
Technical Information
BDU Series Hydrostatic Transmissions
Maintain operating parameters within prescribed limits during all operating conditions. This section defines operating limits given in the table Operating Parameters.
Minimum speed is the lowest input speed recommended during engine idle condition. Operating below minimum speed limits pump’s ability to maintain adequate flow for lubrication and power transmission.
Rated speed is the highest input speed recommended at full power condition. Operating at or below this speed should yield satisfactory product life.
Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces product life and can cause loss of hydrostatic power and braking capacity. Never exceed the maximum speed limit under any operating conditions.
Operating conditions between rated speed and maximum speed should be restricted to less than full power and to limited periods of time. For most drive systems, maximum unit speed occurs during downhill braking or negative power conditions.
W Warning
Unintended vehicle or machine movement hazard.
Exceeding maximum speed may cause a loss of hydrostatic drive line power and 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.
System pressure is the differential pressure between system ports A & B. 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 speed and normal operating—or weighted average— pressure that you can only determine from a duty cycle analysis.
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 (peak) is the highest intermittent pressure allowed under any circumstances. Applications with applied pressures between rated and maximum require factory approval with complete application, duty cycle, and life expectancy analysis.
All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract low loop pressure from gauge readings to compute the differential.
The charge pressure setting listed in the technical specifications is based on the charge flow across the charge pressure relief valve at fluid temperature at 50˚C [120˚F].
Charge pump inlet conditions must be controlled in order to achieve expected life and performance. A continuous inlet vacuum of no less than 0.8 abs bar is recommended. Normal vacuums less than 0.7 abs bar would indicate inadequate inlet design or stricted filter.
© Danfoss | November 2021 |
BC152886484098en-000207 | 15 |