Danfoss H1T 045, H1T 053, H1T 060, H1T 068 User guide
Technical Information
H1T 045/053/060/068
Axial Piston Tandem Pumps
www.danfoss.com
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Revision history Table of revisions
Date Changed Rev
December 2021 Added HDC control 1001
April 2021 Corrected interface with ECU graphic 0905
June 2020 Added section title in ports chapter for clarity 0904
March 2020 Updated port information and changed document number from BC00000060 0903
July 2018 Major revision. 0801
June 2018 Angle sensor chapters added. 0701
September 2017 add G6 option 0603
June 2017 minor edit page 40 0602
April 2017 add 60-68 0601
November 2015 Master Model Code changes 0501
2010-2014 Various changes. BA-EA
Jul 2009 First edition AA
2 | © Danfoss | December 2021 BC152886483958en-001001
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Contents
Technical Specifications
H1 Pumps General Specification.................................................................................................................................................5
Technical Data for H1 Tandem Pumps..................................................................................................................................... 5
Operating parameters for H1 Tandem Pumps...................................................................................................................... 6
Fluid Specification............................................................................................................................................................................7
External radial shaft loads H1 Tandem..................................................................................................................................... 7
Bearing Life.........................................................................................................................................................................................8
Mounting flange loads H1T 045/053.........................................................................................................................................8
Mounting flange loads H1T 060/068.........................................................................................................................................9
Case drain............................................................................................................................................................................................9
Master Model Code
H1T rotation, ports, and second pump options..................................................................................................................10
H1T Controls Options................................................................................................................................................................... 10
H1T Orifice and Displacement Limiter Options.................................................................................................................. 11
H1T Endcap and Mounting Options....................................................................................................................................... 11
H1T Input Shaft and Aux Mounting Options....................................................................................................................... 12
H1T High Pressure Relief Valve Options................................................................................................................................ 12
H1T Pressure Limiter, Charge Pump, and Filtration Options......................................................................................... 13
H1T Charge Pressure Relief, Special Hardware and Settings......................................................................................... 14
Control Options
Electrical Displacement Control (EDC)................................................................................................................................... 15
Control Solenoid Data.............................................................................................................................................................16
Manual Displacement Control (MDC) ....................................................................................................................................17
Hydraulic Displacement Control (HDC)................................................................................................................................. 21
HDC principle.............................................................................................................................................................................21
HDC operation...........................................................................................................................................................................21
Hydraulic signal pressure range..........................................................................................................................................22
Pump output flow direction vs. control pressure.........................................................................................................22
Control response.......................................................................................................................................................................22
Response time, HDC 047/053, 060/068............................................................................................................................23
Forward-Neutral-Reverse Control (FNR)................................................................................................................................24
Control response.......................................................................................................................................................................25
Non feedback proportional electric control (NFPE).......................................................................................................... 26
Manual Override (MOR)............................................................................................................................................................... 28
Swashplate angle sensor for EDC controls........................................................................................................................... 29
Swash plate angle sensor parameters (EDC).................................................................................................................. 29
Swash plate angle sensor connector.................................................................................................................................30
Interface with ECU (EDC)........................................................................................................................................................30
Swash Plate Angle Sensor for NFPE and AC2 Controls.....................................................................................................31
Swash Plate Angle Sensor Parameters (NFPE/AC)........................................................................................................31
Swash-plate Angle Sensor Connector (NFPE/AC2)...................................................................................................... 32
Interface with ECU (NFPE)......................................................................................................................................................32
Control-Cut-Off (CCO) and Brake Release Valves............................................................................................................... 33
Displacement Limiter................................................................................................................................................................... 35
Port Locations
Port Locations H1T 045/053 Tandem..................................................................................................................................... 36
Port Locations H1T 060/068 Tandem..................................................................................................................................... 38
Dimensions
Dimensions H1T 045/053 Tandem.......................................................................................................................................... 39
Dimensions H1T 060/068 Tandem.......................................................................................................................................... 42
Input shaft, option G1 (SAE C, 14 teeth) (045/053/060/068)..........................................................................................43
Input shaft, option G5 (SAE B-B, 15 teeth) (045/053 only).............................................................................................. 44
Input shaft, option G6, (19 teeth-long) (045/053 only).................................................................................................... 45
Input shaft, option F1, (060/068 only)....................................................................................................................................46
Auxiliary mounting pads ............................................................................................................................................................47
060/068 Control dimensions..................................................................................................................................................... 53
045/053 Control dimensions..................................................................................................................................................... 56
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Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Contents
Hydraulic Displacement Control (HDC), options T1, T2...................................................................................................62
Center section coupling, torque rating..................................................................................................................................63
Control Cut Off (CCO)................................................................................................................................................................... 64
045/053 CCO...............................................................................................................................................................................64
060/068 CCO...............................................................................................................................................................................65
Displacement limiter, H1 Tandem, option B........................................................................................................................66
4 | © Danfoss | December 2021 BC152886483958en-001001
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Technical Specifications
H1 Pumps General Specification
Axial piston closed circuit variable displacement pumps of cradle swash-plate design with clockwise or
counterclockwise direction of rotation.
Pipe connections
•
Main pressure ports H1P 045/053: SAE straight thread O-ring boss
•
Main pressure ports H1P 060/068: ISO split flange boss
•
Remaining ports: SAE straight thread O-ring boss
Recommended installation position
Pump installation position is discretionary, however the recommended control position is on the top or
at the side with the top position preferred. If the pump is installed with the control at the bottom,
flushing flow must be provided through port M14 located on the EDC, FNR and NFPE control.
Vertical input shaft installation is acceptable. If input shaft is at the top, 1 bar case pressure must be
maintained during operation. The housing must always be filled with hydraulic fluid. Recommended
mounting for a multiple pump stack is to arrange the highest power flow towards the input source.
Consult Danfoss for nonconformance to these guidelines.
Auxiliary cavity pressure
Auxiliary cavity pressure will be inlet pressure with internal charge pump or case pressure with external
charge supply. For reference see Operating Parameters. Please verify mating pump shaft seal capability.
Technical Data for H1 Tandem Pumps
Technical Data
Feature Unit 045 053 060 068
Displacement cm3 [in3] 45.0 [2.75] 53.8 [3.28] 60.4 [3.69] 68.0 [4.15]
Flow at rated (continuous) speed
Torque at maximum displacement
(theoretical)
Mass moment of inertia of rotating
components
Mass (weight dry, without charge
pump or auxiliary flange)
Oil volume l [US gal] 2.3 [0.61] 2.3 [0.61] 4.2 [1.1] 4.2 [1.1]
*
Applies for each rotating group.
Physical properties
Description 045/053 060/068
Mounting flange per ISO 3019-1 Flange 101-2 (SAE B), special bolt Flange 127-4 (SAE C)
Input shaft outer diameter, splines
per ISO 3019-1
*
l/min
[US gal/min]
N•m/bar
[lb•in/1000 psi]
2
kg•m
[slug•ft2]
kg [lb] 65 [143] 65 [143] 96.2 [212] 96.2 [212]
Ø25 mm - 4 (SAE B-B, 15 teeth)
•
Ø32 mm - 4 (SAE-C, 14 teeth)
•
Ø31 mm - 4 (19 teeth)
•
153 [40] 183 [48] 210 [55.5] 238 [62.8]
0.8 [488] 0.9
0.0077
[0.00568]
[549]0.007
8 [0.00575]
0.0078
[0.00575
•
•
Ø32 mm - 4 (SAE C, 14 teeth)
Ø35 mm - 4 (SAE C, 21 teeth)
0.96 [590] 1.08 [610]
0.0143
[0.01055]
0.0143
[0.01052]
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Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Technical Specifications
Physical properties (continued)
Description 045/053 060/068
Auxiliary mounting flange with
metric fasteners, shaft outer diameter
and splines per ISO 3019-1
Charge inlet port per ISO 11926-1
Main port configuration ISO 11926-1: 1 5∕16 -12 (SAE O-ring
Other ports SAE O-ring boss
Customer interface threads Metric fasteners
Operating parameters for H1 Tandem Pumps
Input Speed (at minimum charge/control pressure)
Description Size 045/053 Size 060/068
Minimum for external charge supply
Rated 3400 min-1 (rpm) 3500 min-1 (rpm)
Maximum 3500 min-1 (rpm) 4000 min-1 (rpm)
1)
Full performance (pressure and displacement) possible at minimum charge and control pressure supply.
Flange 82–2 outer dia:
Ø16 mm - 4 (SAE A, 9 teeth)
•
Ø19 mm - 4 (SAE A, 11 teeth)
•
Flange 101–2 outer dia:
Ø22 mm - 4 (SAE B, 13 teeth)
•
Ø25 mm - 4 (SAE B-B, 15 teeth)
•
7
∕8 -14 (SAE O-ring boss) 1 1∕16 -14 (SAE O-ring boss)
boss)
1)
min-1 (rpm) 500 min-1 (rpm)
Flange 101–2 outer dia:
Ø22 mm - 4 (SAE B, 13 teeth)
•
Ø25 mm - 4 (SAE B-B, 15 teeth)
•
ISO 6162: M12 x 1.75 (Split flange)
System pressure
Description Size 045 Size 053 Size 060 Size 068
System pressure Max. working 420 bar [6092 psi] 380 bar [5511 psi] 420 bar [6090 psi] 380 bar [5510 psi]
Maximum (peak) 450 bar [6527 psi] 400 bar [5802 psi] 450 bar [6525 psi] 400 bar [5800 psi]
Max. low loop 45 bar [653 psi] 45 bar [650 psi]
Min. low loop 10 bar [145 psi] 10 bar [145 psi]
Control pressure Min. at corner
power (EDC,
MDC, FNR)
Maximum 40 bar [580 psi] 40 bar [580 psi]
21.5 bar [312 psi] 18.5 bar [270 psi]
Other pressure type for all tandem pumps
Description 045–068
Charge pressure Minimum without CCO valve 14.5 bar [210 psi]
Minimum with CCO valve 18 bar [265 psi]
Maximum 34 bar [493 psi]
Case pressure Rated 3.0 bar [44.0 psi]
Maximum 5.0 bar [73.0 psi]
Lip seal external Maximum 0.4 bar [5.8 psi]
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Re =
Me
L
P003 303E
L
R
e
M
e
270° Re
180° Re
90° Re
0° Re
CCW
Rotation
CW
Rotation
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Technical Specifications
Fluid Specification
Viscosity
Intermittent
Minimum
Recommended range
Maximum
1)
Intermittent = Short term t < 1 min per incident and not exceeding 2 % of duty cycle based load-life.
Temperature
Minimum
Rated
Recommended range
Maximum Intermittent
1)
Cold start = Short term t > 3 min, p ≤ 50 bar [725 psi], n ≤ 1000 min-1 (rpm).
2)
At the hottest point, normally case drain port.
1)
1)
2)
5 mm2/s [42 SUS]
7 mm2/s [49 SUS]
12 – 80 mm2/s [66 – 370 SUS]
1600 mm2/s [7500 SUS]
-40°C [-40°F]
104°C [220°F]
60 – 85°C [140 – 185°F]
115°C [240°F]
External radial shaft loads H1 Tandem
External radial shaft loads
H1 pumps are designed with bearings that can accept some external radial loads. The external radial
shaft load limits are a function of the load position and orientation, and the operating conditions of the
unit. External radial shaft loads impact lifetime. For lifetime calculations please contact Danfoss
representative.
The maximum allowable radial load (Re) is based on the maximum external moment (Me) and the
distance (L) from the mounting flange to the load.
It may be determined using the following formula:
Radial load position (045/053 shown)
Me = shaft moment
L = flange distance
Re = external force to the shaft
Thrust loads should be avoided. Contact factory in the event thrust loads are anticipated.
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P003 367
M
R
M
S
P003 366a
Control on top
P003 366b
Control on side
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Technical Specifications
Bearing Life
Maximum external shaft load based on shaft deflection
External radial moment Unit Size 045 / 053 Size 060 / 068
M
e
All external shaft loads affect bearing life. In applications with external shaft loads, minimize the impact
by positioning the load at 0° or 180° as shown in the figure.
Danfoss recommends clamp-type couplings for applications with radial shaft loads.
Contact your Danfoss representative for an evaluation of unit bearing life if you have continuously
applied external loads exceeding 25 % of the maximum allowable radial load (Re) or the pump
swashplate is positioned on one side of center all or most of the time.
Mounting flange loads H1T 045/053
H1 tandem pump front flange load
Mounting flange loads H1T 045/053, Controls on top
N•m [lbf•in] 104 [920] 104 [920]
The moments shown below apply for the control orientation on top or side.
Mounting flange loads, Control on top
Rated moment:
MR = 2020 N•m [17 880 lbf•in]
Shock load moment:
MS = 4110 N•m [36 380 lbf•in]
Mounting flange loads, Control on side
Rated moment:
MR = 1300 N•m [11 510 lbf•in]
Shock load moment:
MS = 2930 N•m [25 935 lbf•in]
For more information, see H1 Axial Piston Pumps, Basic Information, BC152886483968, the section
“Mounting flange loads”.
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P109515
Rated moment:
MR = 2190 N•m [19 380 lbf•in]
Shock load moment:
MS = 6560 N•m [58 060 lbf•in]
M
R
M
S
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Technical Specifications
Mounting flange loads H1T 060/068
H1 tandem pump front flange load
Mounting flange loads H1T 060/068, Controls on top
The moments shown apply for the control orientation on top or side.
Case drain
For more information, see H1 Axial Piston Pumps, Basic Information, BC152886483968, the section
“Mounting flange loads”.
The tandem housings are connected through the center section via a drilled hole. The charge relief valve
discharges oil into the front housing. In order to provide positive flow through both housings, use of the
rear housing case drain is required. The front housing case pressure ports should only be used if the
pump is used as a common drain manifold for the vehicle where external drain flow is brought into the
rear housing and discharged out the front.
The allowable case pressures must be met accordingly.
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Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Master Model Code
H1T rotation, ports, and second pump options
Displacement (Front pump, second pump see “C”)
Code Description
045 45 cm3 [2.75 in3]
053 53.8 cm3 [3.28 in3]
060 60 cm3 [3.66 in3]
068 68 cm3 [4.15 in3]
A – Rotation
L Left hand (counter clockwise)
R Right hand (clockwise)
B – Product version
A Revision code
Z – Port configuration
A Inch, Customer O-ring port sealing according to ISO 11926-1
H1T Controls Options
C – Second pump size
N Frame size of rear stage equal front stage (default)
A Rear stage kit 45cc/rev (only use with 53cc/rev front stage)
B Rear stage kit 60cc/rev (only use with 68cc/rev front stage)
D – Controls
Code Control type Input Miscellaneous options Connector
A2 EDC 12 V — DEUTSCH
A3 EDC 24 V — DEUTSCH
A4 EDC 12 V MOR DEUTSCH
A5 EDC 24 V MOR DEUTSCH
A9 FNR 12 V MOR DEUTSCH
H3 EDC 24 V Angle sensor DEUTSCH
H4 MDC front unit — Gain 0.52 with NSS —
FNR rear unit 12 V Gain 0.52 with MOR DEUTSCH
H6 EDC 12 V Angle sensor + MOR DEUTSCH
H7 EDC 24 V Angle sensor + MOR DEUTSCH
B1 FNR 24 V MOR DEUTSCH
B6
D7 EDC front unit 12 V MOR DEUTSCH
D9 MDC front unit — Gain 0.52 with NSS —
N1 NFPE
FNR front unit 12 V — DEUTSCH
EDC rear unit 12 V Gain 0.52 DEUTSCH
FNR rear unit 12 V MOR DEUTSCH
MDC rear unit — Gain 0.52 DEUTSCH
1
12 V MOR DEUTSCH
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Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Master Model Code
D – Controls (continued)
Code Control type Input Miscellaneous options Connector
N2 NFPE
N5 NFPE
N6 NFPE
M1 MDC — — —
M2 MDC — NSS —
T1 HDC 4.2 - 11.6 bar — —
T2 HDC 3.0 - 11.6 bar — —
1
Align with options: E: Displacement limiters and W: Special hardware.
H1T Orifice and Displacement Limiter Options
F – Orifices (mm)
Code Tank (A+B) P A / B Note
C3 No orifice Not to be used for FDC controls and mobile applications.
C1 – – 0.8 Not to be used for FDC controls.
C6 1 – –
C7 1.3 – –
C8 0.6 0.8 –
C9 0.6 1 –
D1 0.8 1 –
D2 0.8 1.3 –
D3 1 1.3 –
D4 1 1.3 1.3
D5 0.6 0.6 0.8
1
1
1
24 V MOR DEUTSCH
12 V Angle sensor + MOR DEUTSCH
24 V Angle sensor + MOR DEUTSCH
To be used for MDC controls only.
E – Displacement limiter
N None
C No limiters, with nested springs, required for NFPE
B Adjustable externally
D Adjustable externally with nested springs, required for NFPE
H1T Endcap and Mounting Options
G – Endcap options
Code Description 045/053 060/068
E7
D1
F7
H3
H4
H5
H6
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Tandem same-sided SAE O-ring boss ports, (HPRV only) standard —
Tandem same-sided SAE O-ring boss ports with Control Cut Off (HPRV only), 12 V —
Tandem same-sided SAE O-ring boss ports with Control Cut Off (HPRV only), 24 V —
Tandem Opp. Port Code 62, 12V CCO & Brake —
Tandem Opp. Port Code 62, 24V CCO & Brake —
Tandem Opp. Port Code 62, 12V CCO —
Tandem Opp. Port Code 62, 24V CCO —
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Master Model Code
G – Endcap options (continued)
Code Description 045/053 060/068
H7
H8
H – Mounting
F
H
J
H1T Input Shaft and Aux Mounting Options
J – Input shaft
Code Description 045/053 060/068
G1 ISO 3019-1, outer Ø32 mm - 4 (SAE C, 14 teeth splined shaft 12/24 pitch)
G5 ISO 3019-1, outer Ø25 mm - 4 (SAE B-B, 15 teeth splined shaft 16/32 pitch) —
G6 ISO 3019-1, outer Ø31 mm - 4 (19 teeth splined shaft 16/32 pitch) (45/53 only) —
F1 ISO 3019-1 outer diameter 35mm -4 (SAE C, 21 teeth splined shaft 16/32 pitch)
Tandem Opp. Port Code 62 —
Tandem Opp Port Code 62, Opposite Charge Inlet —
ISO 3019-1, flange 101-2 SAE B (045/053)
ISO 3019-1, flange 127-4 SAE C (060/068)
ISO 3019-1, flange 101-2 SAE B and speed sensor (045/053)
(60/68 only)
—
K – Auxiliary mounting pad ISO 3019-1 without charge pump, with shipping cover
Code Description 045/053 060/068
NN No auxiliary mounting pad, No shipping cover —
H2 Flange 82 - 2, outer Ø16 mm - 4 (SAE A, 9 teeth 16/32 coupling) (45/53)
H1 Flange 82 - 2, outer Ø19 mm - 4 (SAE A, 11 teeth 16/32 coupling) (45/53)
H3 Flange 101 - 2, outer Ø22 mm - 4 (SAE B, 13 teeth 16/32 coupling)
H5 Flange 101 - 2, outer Ø25 mm - 4 (SAE B-B, 15 teeth 16/32 coupling)
Align with options: S – Charge pump and Y – Special settings.
H1T High Pressure Relief Valve Options
M – High pressure relief valve setting
Code Pressure setting (Use the selection for ports A, B, C and D) 045 053 60 68
13 130 bar [1885 psi] — —
15 150 bar [2175 psi] — —
18 180 bar [2610 psi]
20 200 bar [2900 psi]
23 230 bar [3336 psi]
25 250 bar [3630 psi]
28 280 bar [4061 psi]
30 300 bar [4350 psi]
12 | © Danfoss | December 2021 BC152886483958en-001001
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Master Model Code
M – High pressure relief valve setting (continued)
Code Pressure setting (Use the selection for ports A, B, C and D) 045 053 60 68
33 330 bar [4786 psi]
35 350 bar [5080 psi]
38 380 bar [5510 psi]
40 400 bar [5800 psi] — —
41 410 bar [5946 psi] — — —
42 420 bar [6090 psi] — —
NO bypass, side “A” (front pump) N – High pressure relief valve setting, NO bypass side “B” (front pump) P
– High pressure relief valve setting, NO bypass, side “C” (rear pump) R – High pressure relief valve setting,
NO bypass, side “D” (rear pump).
H1T Pressure Limiter, Charge Pump, and Filtration Options
Pressure limiter 060/068
Code Pressure setting (Use the selection for ports A, B, C and D) 060 068
AE 150 bar PL / 200 bar HPRV
AH 180 bar PL / 250 bar HPRV
BK 200 bar PL / 250 bar HPRV
BC 230 bar PL / 280 bar HPRV
BE 250 bar PL / 300 bar HPRV
BH 280 bar PL / 330 bar HPRV
CK 300 bar PL / 350 bar HPRV
CC 330 bar PL / 380 bar HPRV
CE 350 bar PL / 400 bar HPRV
CH 380 bar PL / 430 bar HPRV
DK 400 bar PL / 450 bar HPRV -
DA 410 bar PL / 450 bar HPRV -
DB 420 bar PL / 450 bar HPRV -
S – Charge pump
N No charge pump, external charge supply (Align with options: T – Filtration)
T – Filtration
P Remote full charge flow filtration (045/053 only)
E External charge filtration (060/068 only)
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Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Master Model Code
H1T Charge Pressure Relief, Special Hardware and Settings
V – Charge pressure relief setting
Code Description
18 18 bar [261 psi]
20 20 bar [290 psi]
22 22 bar [319 psi]
24 24 bar [348 psi]
26 26 bar [377 psi]
28 28 bar [406 psi]
30 30 bar [435 psi]
32 32 bar [464 psi]
34 34 bar [493 psi]
W – Special hardware features
PN EDC/FNR/MDC valve plate (without a handle)
P1 NFPE valve plate (Align with options: D – Control selection and E – Displacement limiters)
P4 EDC/FNR/MDC Valve Plate and Speed Ring (045/053 only)
H1 EDC/FNR/MDC Valve Plate, included MDC Handle (All frames)
H2 EDC/FNR/MDC Valve Plate, MDC Handle Front, System Loop Bypass (045/053 only)
Not to be used for NFPE controls.
X – Paint and nametag
NNN Black paint and Danfoss nametag
Y – Special settings
NNN None
M00 MDC (handle in standard position)
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P003 191
Feedback from
Swash plate
PTF00B
M14
C1 C2
F00A
P003 478E
"0"
-b -a
ba
100 %
100 %
Displacement
Current mA
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Control Options
Electrical Displacement Control (EDC)
An EDC is a displacement (flow) control. Pump swash plate position is proportional to the input
command and therefore vehicle or load speed (excluding influence of efficiency), is dependent only on
the prime mover speed or motor displacement.
The Electrical Displacement Control (EDC) consists of a pair of proportional solenoids on each side of a
three-position, four-way porting spool. The proportional solenoid applies a force input to the spool,
which ports hydraulic pressure to either side of a double acting servo piston. Differential pressure across
the servo piston rotates the swash plate, changing the pump‘s displacement from full displacement in
one direction to full displacement in the opposite direction.
A serviceable 170 μm screen is located in the supply line immediately before the control porting spool.
Under some circumstances, such as contamination, the control spool could stick and cause the pump to
stay at some displacement.
Electrical Displacement Control
Control signal requirements, EDC H1T
Pump displacement vs. control current
EDC schematic, feedback from swash plate
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Danfoss | December 2021 BC152886483958en-001001 | 15
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Control Options
EDC control current
Voltage 12 V
Minimum current to stroke pump a
Pin connections any order
*
Factory test current, for vehicle movement or application actuation expect higher or lower value.
Control Solenoid Data
Description 12 V 24 V
Maximum current 1800 mA 920 mA
Nominal coil resistance @ 20 °C [68 °F] 3.66 Ω 14.20 Ω
@ 80 °C [176 °F] 4.52 Ω 17.52 Ω
Inductance 33 mH 140 mH
PWM signal frequency Range 70 – 200 Hz
Recommended
IP Rating IEC 60 529 IP 67
DIN 40 050, part 9 IP 69K with mating connector
Connector color Black
*
PWM signal required for optimum control performance.
DC
*
b 1640 mA 820 mA
*
100 Hz
640 mA 330 mA
24 V
DC
Control response
H1T controls are available with optional control passage orifices to assist in matching the rate of swashplate response to the application requirements (e.g. in the event of electrical failure).
The time required for the pump output flow to change from zero to full flow (acceleration) or full flow to
zero (deceleration) is a net function of spool porting, orifices, and charge pressure.
A swash-plate response times table is available for each frame size. Testing should be conducted to verify
the proper orifice selection for the desired response. Typical response times at the following conditions:
Δ p = 250 bar [3626 psi]
Charge pressure = 20 bar [290 psi]
Viscosity and temperature = 30 mm²/s [141 SUS] and 50 °C [122 °F]
Speed = 1800 min-1 (rpm)
Response time, EDC 045/053
Stroking direction 0.8 mm [0.03 in] orifice 1.3 mm [0.05 in] orifice No orifice
Neutral to full flow 1.7 s 0.9 s 0.5 s
Full flow to neutral 1.1 s 0.6 s 0.3 s
Response time, EDC 060/068
Stroking direction 0.8 mm [0.03 in] Orifice 1.3 mm [0.05 in] Orifice No orifice
Neutral to full flow 2.6 s 1.2 s 0.8 s
Full flow to neutral 1.7 s 0.8 s 0.4 s
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"0"
Lever rotation
"A"
Displacement
100 %
a
-a
100 %
"B"
-b
-d
b
c
d
-c
P301 752
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Control Options
Manual Displacement Control (MDC)
A Manual proportional Displacement Control (MDC) consists of a handle on top of a rotary input shaft.
The shaft provides an eccentric connection to a feedback link. This link is connected on its one end with a
porting spool. On its other end the link is connected the pumps swashplate.
This design provides a travel feedback without spring. When turning the shaft the spool moves thus
providing hydraulic pressure to either side of a double acting servo piston of the pump.
Differential pressure across the servo piston rotates the swash plate, changing the pump’s displacement.
Simultaneously the swashplate movement is fed back to the control spool providing proportionality
between shaft rotation on the control and swash-plate rotation. The MDC changes the pump
displacement between no flow and full flow into opposite directions.
Under some circumstances, such as contamination, the control spool could stick and cause the pump to
stay at some displacement.
For the MDC with CCO option the brake port (X7) provides charge pressure when the coil is energized to
activate static function such as a brake release. The X7 port must not be used for any continuous oil
consumption.
The MDC is sealed by means of a static O-ring between the actuation system and the control block. Its
shaft is sealed by means of a special O-ring which is applied for low friction. The special O-ring is
protected from dust, water and aggressive liquids or gases by means of a special lip seal.
Manual Displacement Control Pump displacement vs. control lever rotation
Deadband on B side: a = 3° ±1°
Maximum pump stroke: b = 30° +2/-1°
Required customer end stop: c = 36° ±3°
Internal end stop: d = 40°
MDC operation
The MDC provides a mechanical dead-band required to overcome the tolerances in the mechanical
actuation. The MDC contains an internal end stop to prevent turning the handle into any inappropriate
position.
The MDC provides a permanent restoring moment appropriate for turning the MDC input shaft back to
neutral position only. This is required to take the backlash out of the mechanical connections between
the Bowden cable and the control.
High case pressure may cause excessive wear and the NSS to indicate that the control is not in neutral
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position. In addition, if the case pressure exceeds 5 bar there is a risk of an insufficient restoring moment.
The MDC is designed for a maximum case pressure of 5 bar and a rated case pressure of 3 bar.
C
C
CCW
CW
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Control Options
Customers must install some support to limit the setting range of their Bowden cable to avoid an
•
overload of the MDC.
Customers can apply their own handle design but they must care about a robust clamping
•
connection between their handle and the control shaft and avoid overload of the shaft.
Customers can connect two MDC’s on a tandem unit in such a way that the actuation force will be
•
transferred from the pilot control to the second control. The kinematic of the linkages must ensure
that either control shaft is protected from torque overload.
Caution
Using the internal spring force on the input shaft is not an appropriate way to return the customer
connection linkage to neutral, or to force a Bowden cable or a joystick back to neutral position. It is not
applicable for any limitation of the Bowden cable stroke, except the applied torque to the shaft will never
exceed 20 N•m.
MDC Torque
Description Value
Torque required to move handle to maximum displacement 1.4 N•m [12.39 lbf•in ]
Torque required to hold handle at given displacement 0.6 N•m [5.31 lbf•in]
Maximum allowable input torque 20 N•m [177 lbf•in]
Caution
Volumetric efficiencies of the system will have impacts on the start and end input commands.
MDC shaft rotation
Pump shaft rotation
MDC shaft rotation CW CCW CW CCW
Port A in (low) out (high) out (high) in (low)
Port B out (high) in (low) in (low) out (high)
Servo port high pressure M5 M4 M5 M4
*
As seen from shaft side.
*
Clockwise (CW) Counter-clockwise (CCW)
Control response
H1T controls are available with optional control passage orifices to assist in matching the rate of swashplate response to the application requirements (e.g. in the event of electrical failure).
The time required for the pump output flow to change from zero to full flow (acceleration) or full flow to
zero (deceleration) is a net function of spool porting, orifices, and charge pressure.
A swash-plate response times table is available for each frame size. Testing should be conducted to verify
the proper orifice selection for the desired response. Typical response times at the following conditions:
Δ p = 250 bar [3626 psi]
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Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Control Options
Charge pressure = 20 bar [290 psi]
Viscosity and temperature = 30 mm²/s [141 SUS] and 50 °C [122 °F]
Speed = 1800 min-1 (rpm)
Response time, MDC 045/053
Code
C3
C6
C7
C8
C9
D1
D2
D3
D4
D5
P A B
– – – – 0.3 0.4
– – – 1 0.9 0.8
– – – 1.3 0.6 0.6
0.8 – – 0.6 2.9 2.0
1 – – 0.6 2.7 1.9
1 – – 0.8 1.7 1.2
1.3 – – 0.8 1.5 1.1
1.3 – – 1 1.1 0.8
1.3 1.3 1.3 1 1.3 1.0
0.6 0.8 0.8 0.6 5.4 2.8
Orifice description (mm) Stroking direction (sec)
Tank (A+B) Neutral to full flow Full flow to neutral
Response time, MDC H1T
Code Orifice description (mm) Stroking direction
Tank (A+B) P A/B Neutral to full flow Full flow to neutral
C3
C6
C7
D1
D2
D3
D4
1 – – s s
1.3 – – s s
0.8 1 – s s
0.8 1.3 – s s
1 1.3 – s s
1 1.3 1.3 s s
No orifice s s
For further data please contact your Danfoss representative.
Neutral start switch (NSS)
The Neutral Start Switch (NSS) contains an electrical switch that provides a signal of whether the control
is in neutral. The signal in neutral is Normally Closed (NC).
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Danfoss | December 2021 BC152886483958en-001001 | 19
P005 702
M14
M5
M4
M3
P301 749
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Control Options
Neutral start switch schematic
Neutral start switch data
Max. continuous current with switching
Max. continuous current without switching
Max. voltage
Electrical protection class
8.4 A
20 A
36 V
DC
IP67 / IP69K with mating connector
Case Gauge Port M14
The drain port should be used when the control is mounted on the unit’s bottom side to flush residual
contamination out of the control.
Lever
MDC controls are available with optional lever/handle. Align with Settings: Y module in the model code.
Standard orientation 90° from input shaft
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P400520
P400519
X1
F00B
F00A
Feedback from
Swashplate
T P
X2M14
Technical Information
H1T 045/053/060/068 Axial Piston Tandem Pumps
Control Options
Hydraulic Displacement Control (HDC)
HDC principle
An HDC is a Hydraulic Displacement Control. Pump swashplate position is proportional to the input
command and therefore vehicle speed or load speed (excluding influence of efficiency), is dependent
only on the prime mover speed or motor displacement.
The HDC control uses a hydraulic input signal to operate a porting spool, which ports hydraulic pressure
to either side of a double acting servo piston. The hydraulic signal applies a force input to the spool
which ports hydraulic pressure to either side of a double acting servo piston. Differential pressure across
the servo piston rotates the swashplate, changing the pump’s displacement from full displacement in
one direction to full displacement in the opposite direction. Under some circumstances, such as
contamination, the porting spool could stick and cause the pump to stay at some displacement.
A serviceable 175 μm screen is located in the supply line immediately before the control porting spool.
HDC control
HDC schematic
HDC operation
HDC’s are hydraulically driven control which ports hydraulic pressure to either side of a porting spool,
which pressurizes one end of the servo piston, while draining the other end to case. Pressure differential
across the servo piston moves the swashplate.
A swashplate feedback link, opposing control linkage, and a linear spring provide swashplate position
force feedback to the hydraulic pressure. As hydraulic pressures in the operating loop change with load,
the control assembly and servo/swashplate system work constantly to maintain the commanded position
of the swashplate.
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Danfoss | December 2021 BC152886483958en-001001 | 21
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