Danfoss H1B 060, H1B 080, H1B 110, H1B 160, H1B 210 Service guide

Service Manual

H1B 060/080/110/160/210/250

H1 Bent Axis Motors

www.danfoss.com

Service Manual

H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

Revision history	Table of revisions
	Date		Changed	Rev
	March 2020		Added adjustment details for threshold settings and changed document number from	0607
			AX00000025
	August 2019		Added caution for servo piston removal	0505
	August 2018		update adjustment chapter	0504
	April 2018		Major layout update, QF080 to QM050 updates	0503
	January 2018		update pressure compensator torque values	0502
	July 2016		Add G1, G2 controls	0501
	December 2015		Add 210 frame size	0500
	November 2015		Model code change	0400
	July 2015		correct torque values, pages 61, 62	0301
	June 2015		add hydraulic controls THHA, THHB	0300
	2008-2015		First edition - and next various changes.	AA-CB

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Service Manual
H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc
Contents
Introduction
About this manual............................................................................................................................................................................	5
Warranty..............................................................................................................................................................................................	5
General Instructions........................................................................................................................................................................	5
Safety precautions............................................................................................................................................................................	5
Symbols used in Danfoss literature............................................................................................................................................	7
H1 general information
Design of H1 bent axis motor......................................................................................................................................................	8
General description.......................................................................................................................................................................	10
H1 pictorial diagram.....................................................................................................................................................................	11
H1 system schematic....................................................................................................................................................................	12
Technical specifications
General specifications..................................................................................................................................................................	13
Physical properties........................................................................................................................................................................	13
Operating Parameters..................................................................................................................................................................	14
H1B speed range diagrams for open and closed circuit..................................................................................................	15
Required inlet pressure diagrams (for cylinder block filling).........................................................................................	16
Open circuit requirements..........................................................................................................................................................	17
Fluid specifications........................................................................................................................................................................	18
Determination of nominal motor size....................................................................................................................................	18
Operation
Shaft rotation direction................................................................................................................................................................	19
Loop flushing shuttle spool........................................................................................................................................................	21
Loop flushing relief valve............................................................................................................................................................	22
Speed sensor...................................................................................................................................................................................	23
Displacement limiter.....................................................................................................................................................................	23
Operating parameters
Output speed...................................................................................................................................................................................	24
System pressure.............................................................................................................................................................................	24
Case pressure...................................................................................................................................................................................	25
External shaft seal pressure........................................................................................................................................................	25
Temperature....................................................................................................................................................................................	25
Fluid and filter maintenance
Fluid and filter recommendations...........................................................................................................................................	26
Pressure measurements
Ports and Gauge Information....................................................................................................................................................	27
Initial startup procedures
Procedure..........................................................................................................................................................................................	29
Troubleshooting
Overview...........................................................................................................................................................................................	31
Electrical troubleshooting..........................................................................................................................................................	31
Sluggish operation........................................................................................................................................................................	31
System operating hot...................................................................................................................................................................	31
Excessive noise or vibration.......................................................................................................................................................	32
Motor operates normally in one direction only..................................................................................................................	32
Improper output speed...............................................................................................................................................................	32
Low output torque........................................................................................................................................................................	33
Required tools and standard procedures
Adjustments
Optional threshold adjustment – Electric proportional controls.................................................................................	36
Optional threshold adjustment – Hydraulic proportional controls.............................................................................	37
Pressure Compensator OverRide (PCOR) adjustment......................................................................................................	38
Minor repair
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Contents
Shaft seal...........................................................................................................................................................................................	41
Electric proportional solenoid replacement........................................................................................................................	43
Hydraulic proportional actuator replacement....................................................................................................................	44
Control module replacement....................................................................................................................................................	45
Electric proportional control module.....................................................................................................................................	47
Hydraulic proportional control module.................................................................................................................................	50
Electric two-position control module.....................................................................................................................................	52
Hydraulic two-position control module................................................................................................................................	55
Hydraulic two-position control module with PCOR..........................................................................................................	56
Hydraulic two-position control module with PCOR and hydraulic BPD....................................................................	57
Maximum displacement limiter two-position controls...................................................................................................	59
Servo piston cover – proportional control............................................................................................................................	60
Replace speed sensor...................................................................................................................................................................	63
Loop flushing spool.......................................................................................................................................................................	64
Loop flushing charge relief valve.............................................................................................................................................	65
Minimum Displacement limiter................................................................................................................................................	66
Torque chart
Fasteners, plugs with torque chart..........................................................................................................................................	67

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Service Manual

H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

Introduction

About this manual

This manual includes information for the installation, maintenance, and minor repair procedures for H1 bent axis motors. It includes a description of the unit and its individual components, troubleshooting information, and minor repair procedures.

Performing minor repairs may require removal from the vehicle/machine. Thoroughly clean the unit before beginning maintenance or repair activities. Since dirt and contamination are the greatest enemies of any type of hydraulic equipment, follow cleanliness requirements strictly. This is especially important when changing the system filter and when removing hoses or plumbing.

Only Danfoss global service partners (GSPs) are authorized to perform major repairs.Danfoss trains Global Service Partners and certifies their facilities on a regular basis. You can locate your nearest service partner at www.danfoss.com > Contact us > Danfoss sales and services > Distributor and service partners

Warranty

Performing installation, maintenance, and minor repairs according to the procedures in this manual will not affect your warranty. Major repairs requiring the removal of a unit’s rear cover voids the warranty unless done by a Danfoss Global Service Partner.

General Instructions

When repairing H1 variable displacement closed circuit motors follow these general procedures:

Remove the unit	Chock the wheels on the vehicle or lock the mechanism to inhibit movement.
	Prior to performing repairs, remove the unit from the vehicle/machine. Be aware
	that hydraulic fluid may be under high pressure and/or hot. Inspect the outside of
	the motor and fittings for damage. Cap hoses after removal to prevent
	contamination.
Keep it clean	Cleanliness is a primary means of assuring satisfactory motor life, on either new or
	repaired units. Clean the outside of the motor thoroughly before disassembly.
	Take care to avoid contamination of the system ports. Cleaning parts with a clean
	solvent wash and air drying is usually adequate. Keep all parts free of foreign
	materials and chemicals. Protect all exposed sealing surfaces and open cavities
	from damage and foreign material.
Lubricate moving	During assembly, coat all moving parts with a film of clean hydraulic oil. This
parts	assures that these parts are lubricated during start-up.
Replace all O-rings	Danfoss recommends you replace all O-rings and gaskets during repair. Lightly
and gaskets	lubricate O-rings with clean petroleum jelly prior to assembly.
Secure the unit	For repair, place the unit in a stable position with the shaft pointing downward.
	Secure the motor while removing and torquing components and fasteners.

Safety precautions

Always consider safety precautions before beginning a service procedure. Protect yourself and others from injury. Take the following general precautions whenever servicing a hydraulic system.

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Introduction

Unintended machine movement

W Warning

Unintended movement of the machine or mechanism may cause injury to the technician or bystanders. To protect against unintended movement, secure the machine or disable/disconnect the mechanism while servicing.

Flammable cleaning solvents

W Warning

Some cleaning solvents are flammable. To avoid possible fire, do not use cleaning solvents in an area where a source of ignition may be present.

Fluid under pressure

W Warning

Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing serious injury and/or infection. This fluid may also be hot enough to cause burns. Use caution when dealing with hydraulic fluid under pressure. Relieve pressure in the system before removing hoses, fittings, gauges, or components. Never use your hand or any other body part to check for leaks in a pressurized line. Seek medical attention immediately if you are cut by hydraulic fluid.

Personal safety

W Warning

Protect yourself from injury. Use proper safety equipment, including safety glasses, at all times.

Hazardous material

W Warning

Hydraulic fluid contains hazardous material. Avoid prolonged contact with hydraulic fluid. Always dispose of used hydraulic fluid according to environmental regulations.

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Introduction

Symbols used in Danfoss literature

WARNING may result in injury

CAUTION may result in damage to product or property

Reusable part

Non-reusable part, use a new part

Non-removable item

Option - either part may exist

Superseded - parts are not interchangeable

Measurement required

Flatness specification

Parallelism specification

External hex head

Internal hex head

Torx head

O-ring boss port

Tip, helpful suggestion

Lubricate with hydraulic fluid

Apply grease / petroleum jelly

Apply locking compound

Inspect for wear or damage

Clean area or part

Be careful not to scratch or damage Note correct orientation

Mark orientation for reinstallation

Torque specification

Press in - press fit

Pull out with tool – press fit

Cover splines with installation sleeve

Pressure measurement/gauge location or specification

The symbols above appear in the illustrations and text of this manual. They are intended to communicate helpful information at the point where it is most useful to the reader. In most instances, the appearance of the symbol itself denotes its meaning. The legend above defines each symbol and explains its purpose.

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H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

H1 general information

Design of H1 bent axis motor

Cross-section of H1 motor with electric proportional control

		1
	5	2
		3

4

6

7

8

1.Differential servo piston

2.Valve segment

3.Bearing plate

4.Tapered roller bearing

5.Loop flushing relief valve

6.Ramp spring

7.Loop flushing shuttle spool

8.Electric proportional control

9.Minimum displacement limiter

10.Speed ring (optional)

10

9

P005 917

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H1 general information

Cross-section of H1 motor with electric two-position control

		7
	6	1
		2
		3
5		4

9

8

P005 918

1.Differential servo piston

2.Valve segment

3.Bearing plate

4.Tapered roller bearing

5.Loop flushing relief valve

6.Loop flushing shuttle spool

7.Electric two-position control

8.Minimum displacement limiter

9.Speed ring (optional)

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H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

H1 general information

General description

Series H1 variable displacement motors are bent axis design, incorporating spherical pistons.

These motors are designed primarily to be combined with other products in closed circuit systems to transfer and control hydraulic power. Series H1 motors have a large maximum/minimum displacement ratio of 5:1 and high output speed capabilities.

The expanded function of zero degree capability, coupled with a high performance 32 degree maximum angle, creates opportunities to easily improve the machine performance for:

•Wheel assist on the steering axle of high inertia machines (i.e. combines) and could include Anti Slip Control

•Off-highway machines requiring Anti Slip Control (i.e. Ag. sprayer)

•Multi-motor applications requiring optimized work and transport modes (i.e. wheel loader, Ag sprayer) utilizing the zero degree position for maximum transport speed

•Improved machine (i.e. single drum roller) gradeability through precise Anti Slip Control

The Anti Slip Control reduces ground damage, increases traction control and improves machine controllability for the operator.

SAE, Cartridge (not available for 210 cm3 and 250 cm3) and DIN flange with radial or axial high pressure port configurations are available including the loop flushing device.

A complete family of controls and regulators are available to fulfill the requirements of a wide range of applications.

Motors normally start at maximum displacement. This provides maximum starting torque for high acceleration.

All controls utilize internally supplied servo pressure. This may be overridden by a pressure compensator which functions when the motor is operating in motor and pump modes. A defeat option is available to disable the pressure compensator override when the motor is running in pump mode during deceleration/braking.

The pressure compensator option features a low pressure rise to ensure optimal power utilization throughout the entire displacement range of the motor.

Speed sensor options are available to cover all frame sizes and flange styles. They are capable of sensing the following, all in one package:

•Speed

•Direction (only group "J", option "S")

•Temperature (only group "J", option "S")

The electric controls are specifically designed for the Danfoss family of PLUS+1® microcontrollers for easy "Plug and Perform" installation.

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H1 general information

H1 pictorial diagram

14

15

2

3

12

11 17

9	7	5

13

	6
	18
	16
4	10
8	1
7	5

P003 423

Working loop A (Low pressure) and charge pressure

Working loop B (High pressure)

Servo pressure

Case drain

Suction

1. Bent Axis Variable Displacement Motor	10. Charge Pressure Filter
2. Axial Piston Variable Displacement Pump	11. Heat Exchanger
3. Electric Displacement Control (EDC)	12. Heat Exchanger Bypass Valve
4. Charge Pump	13. Valve Segment
5. Charge Check / High Pressure Relief Valve	14. Pump Swashplate
6. Loop Flushing Valve	15. Input Shaft
7. Pressure Limiter Valve	16. Output Shaft
8. Charge Pressure Relief Valve	17. Reservoir
9. Servo Cylinder	18. to Motor Case

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H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

H1 general information

H1 system schematic

System schematic H1 pump and H1 motor with EDC

M14	M6	1	2
			R1
		<![if ! IE]> <![endif]>R2
C2	C1
			M3 L1	L2 MA	L2		MA	N
F00B	F00A			A	A
								n
M5
	CW				max.	min.
								L1
M4				B	B
		S L3	L4	MB	M4	M5	MB
			max. 3 bar
			[43.5 psi]				P003 424

The schematic above shows the function of a hydrostatic transmission using an H1 axial variable displacement pump with electric proportional displacement control (EDC) and an H1 bent axis variable displacement motor with electric proportional control (L*) and integrated loop flushing device.

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Technical specifications

General specifications

General specifications

Design	Piston motor with variable displacement bent axis design
Direction of rotation	Bi-directional
Pipe connections	Main pressure ports: ISO split flange boss
	Remaining ports: SAE straight thread O-ring boss
Recommended installation	Discretionary, the housing must always be filled with hydraulic fluid

Physical properties

Physical properties

Features

Unit

Size

060

080

110

160

210

250

Displacement

maximum

cm3 [in3]

60 [3.66]

80 [4.88]

110

[6.71]

160

[9.76]

210

[12.81]

250

[15.25]

minimum

12 [0.73]

16 [0.98]

22 [1.34]

32 [1.95]

42 [2.56]

50 [3.05]

Theoretical flow at

at rated speed

l/min

216 [57]

256 [68]

319

[84]

416

[110]

504

[133]

550

[145]

max. displ.

at max. speed

[US gal/min]

270 [71]

328 [87]

407

[108]

528

[139]

630

[166]

700

[185]

Theoretical torque

N•m/bar

0.96 [583]

1.27 [777]

1.75 [1069]

2.55 [1555]

3.34 [2038]

3.98 [2426]

at max. displacement

[lb•in/1000 psi]

Theor. corner power at rated speed and max.

kW [hp]

266 [357]

321 [430]

396

[531]

513

[689]

609

[817]

684

[917]

working pressure (∆p = 450 bar [6527 psi])

Mass moment of inertia of rotating

kg•m2

0.0038

0.0062

0.0108

0.0211

0.0306

0.0402

components

[slug•ft2]

[0.0028]

[0.0046]

[0.0080]

[0.0156]

[0.0226]

[0.0296]

Case volume

l [US gal]

0.9 [0.24]

1.0 [0.26]

1.4 [0.37]

2.7 [0.71]

2.8 [0.74]

4.1 [1.08]

Weight dry (Electric proportional control)

Configuration				Size
	060	080	110		160	210	250
SAE	29.8 kg [65.7 lb]	34.8 kg [76.7 lb]	48.8 kg [107.6 lb]		61.9 kg [136.5 lb]	81.0 kg [179 lb]	87.0 kg [196.2 lb]
DIN	28.3 kg [62.4 lb]	34.4 kg [75.8 lb]	45.0 kg [99.2 lb]		59.3 kg [130.7 lb]	75.0 kg [165 lb]	79.6 kg [175.5 lb]
Cartridge	26.9 kg [59.3 lb]	33.0 kg [72.6 lb]	41.8 kg [92.2 lb]		54.7 kg [120.6 lb]	–	–

Mounting flange

Configuration					Size
	060		080	110		160	210		250
SAE ISO 3019/1	127-4	(SAE C) 4-bolt		152-4 (SAE-D) 4-bolt				165-4 (SAE E)
DIN ISO 3019/2, B4	125 HL 4-bolt		140 HL 4-bolt	160 HL 4-bolt		180 HL 4-bolt	200 HL 4-bolt		200 HL 4-bolt
	Pilot Ø160 mm		Pilot Ø190 mm		Pilot Ø200 mm
Cartridge	2-bolt (200 dist.)		2-bolt (224 dist.)	2-bolt (250 dist.) M20			–		–
	M16		M20

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H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

Technical specifications

Customer ports

Size	060	080	110	160		210	250
Axial and radial1)	DN19 typ 1	DN25 typ 1	DN25 typ 1	DN32 typ 1		DN32 typ 1	DN32 typ 1
Case drain ports2)	0.875 [7∕8]–14UN-2B		1.0625 [11∕16]–12UN-2B			1.313 [15∕16]–12UN-2B]
Axial gauge	0.875 [7∕8]–14UN-2B			1.0625 [11∕16]–12UN-2B
ports2)3)
Radial gauge			0.5625 [9∕16]–18UNF-2B
port2)3)

1)Split flange Boss per ISO6162, 40 MPa series

2)SAE O-ring boss

3)Countersink may be deeper that specified in the standard.

Operating Parameters

Output Speed

Output Speed	Displacement	Unit				Size
			060	080	110		160	210	250
	Maximum 32°		3600	3200	2900		2600	2350	2200
Rated	Minimum 6°		5900	5300	4800		4250	3850	3650
	Zero 0°	min-1	6600	5950	5350		4750	4300	4050
	Maximum 32°	(rpm)	4500	4100	3700		3300	3000	2800
Maximum	Minimum 6°		7250	6600	5950		5250	4800	4500
	Zero 0°		7950	7200	6500		5750	5250	4900

System and Case Pressure, Ambient Temperature

Parameter		All sizes
System pressure	Maximum working	450 bar [6527 psi]
	Maximum	480 bar [6962 psi]
	Minimum1)	2)
Case pressure	Rated	3 bar [44 psi]
	Maximum	5 bar [73 psi]
	Minimum	0.3 bar [4 psi]
Ambient temperature3)	Maximum	70 °C [158 °F]
	Minimum	-40 °C [-40 °F]

1)Minimum above case pressure (open and closed circuit)

2)See the graphs Required inlet pressure diagrams (for cylinder block filling) on page 16.

3)Air temperature close to the unit.

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Technical specifications

H1B speed range diagrams for open and closed circuit

Speed (rpm) versus Displacement (%), Intermittent operation (grey area)

8000					8000
				H1B 060
7000					7000
6000					6000
5000					5000
4000					4000
3000					3000
2000					2000
1000					1000
0					0
0%	20%	40%	60%	80%	100%
					P003 557

				H1B 080
0%	20%	40%	60%	80%	100%
					P003 509

7000						7000
6000				H1B 110		6000
5000						5000
4000						4000
3000						3000
2000						2000
1000						1000
00%						0
	20%	40%	60%	80%	100%	0%
					P003 511

6000						6000
5000				H1B 210		5000
4000						4000
3000						3000
2000						2000
1000						1000
0						0
0%	20%	40%	60%	80%	100%	0%
					P006 001

H1B 160

20%	40%	60%	80%
				100%
				P301 307

H1B 250

20%	40%	60%	80%
				100%
				P301 457

W Warning

Zero degree capability results in a high risk of overspeed and drops in efficiency if the motor operates between 0–20% displacement.

For open circuit applications it is not allowed to operate in the intermitent area.

For closed circuit applications operating in the intermittent area, please contact your local Danfoss Power Solutions representative.

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Technical specifications

Required inlet pressure diagrams (for cylinder block filling)

Speed (rpm) and Pressure (bar) versus Displacement (%)

9000						8000
8000				H1B 060		7000				H1B 080
7000						6000
6000						5000
5000					30bar	4000					30bar
4000
					20bar						20bar
						3000
3000					15bar						15bar
2000					10bar	2000					10bar
											5bar
1000					5bar	1000
					2bar						2bar
0 0%	20%	40%	60%	80%	100%	0 0%	20%	40%	60%	80%	100%
					P006 010						P006 011

Speed (rpm) and Pressure (bar) versus Displacement (%)

7000						7000
6000				H1B 110		6000				H1B 160
5000						5000
4000					30bar	4000
3000					20bar	3000					30bar
											20bar
					15bar
											15bar
2000					10bar	2000
											10bar
1000					5bar	1000					5bar
					2bar
											2bar
0 0%	20%	40%	60%	80%	100%	0 0%	20%	40%	60%	80%	100%
					P006 012						P006 013

Speed (rpm) and Pressure (bar) versus Displacement (%)

6000
5000				H1B 210
4000
3000					30bar
					20bar
2000					15bar
					10bar
1000					5bar
					2bar
0 0%	20%	40%	60%	80%	100%
					P006 014

6000

5000				H1B 250
4000
3000					30bar
2000					20bar
					15bar
					10bar
1000					5bar
					2bar
0 0%	20%	40%	60%	80%	100%
					P006 015

Bold dashed line: Maximum speed Bold solid line: Rated speed

This pressure ensures that the cylinder block will be properly filled and that there is no pulling between piston and shaft. The required pressure is 0 bar at 0 rpm and increases with rpm.

For open circuit applications it is not allowed to operate above rated speed. For closed circuit applications operating between rated and max. speed, please contact your local Danfoss Power Solutions representative.

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H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

Technical specifications

Open circuit requirements

H1 Bent Axis Motors may be used in Open Circuit (OC) applications.

Since loop flushing is typically not used in OC-applications it is essential to provide sufficient cooling capacity. This can be done by motor case cross flushing.

The flow rate needs to be adjusted to the cooling demand.

The highest case drain outlet port must always be used for the return flow to the cooler or tank.

The motor case, the control system and the working lines connected to Port A and B must be kept full of oil at all times, whether in a dynamic or static condition.

The plumbing must not allow the oil to drain down and be replaced with air in the control or rotating group.

The minimum pressure in the inlet port and the outlet port, measured at gage ports MA and MB, must be equal or higher as shown in the graphs Required inlet pressure diagrams (for cylinder block filling) on page 16.

Counter balance valves may be used to maintain the minimum pressure requirements. Also the Danfoss Power Solutions Meter-in / Meter-out PVG technology may be used.

Check valves and sufficient charge pressure supply are also possible.

At no time shall the motor be allowed to operate above the rated speed limits. If flow limiter valves are used, they must be selected accordingly. Select Motor controls which use the high loop system pressure to shift the servo piston. This will ensure proper function under all conditions.

Valve blocks, such as counter balance valves attached to the inlet and/or outlet ports, must not interfere with any part of the motor. A review of the outline drawings or appropriate 3D models must be completed.

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H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

Technical specifications

Fluid specifications

Fluid specifications

	Features		Unit	All sizes
		Minimum intermittent		7 [49]
			mm2/s
	Viscosity	Recommended range		12-80 [66-366]
			[SUS]
		Maximum intermittent		1600 [7416]
		Minimum		-40 [-40]
			°C
	Temperature range1)2)	Rated		104 [220]
			[°F]
		Maximum intermittent		115 [240]
		Required cleanliness per ISO 4406	-	22/18/13
	Cleanliness and Filtration	Efficiency (charge pressure filtration)	β-ratio	β15-20 = 75 (β10 ≥ 10)
		Efficiency (suction / return line filtration)		β35-45 = 75 (β10 ≥ 2)
		Recommended inlet screen mesh size	µm	100 – 125

1)At the hottest point, normally case drain port.

2)Minimum: cold start, short term t<3 min, p<50 bar, n<1000 rpm.

Determination of nominal motor size

Based on SI units

Based on US units

Qe

=

Vg • n

1000 •

v

Me

=

Vg • p •

mh

20 •

Pe =

Me • n

=

Qe • p • t

9550

600

n =

Qe • 1000 • v

Vg

Where:

Qe

Input flow (l/min)

Me

Output torque (N•m)

Pe

Output power (kW)

n

Speed (min-1)

Vg

Motor displacement per rev. (cm3/rev)

phigh

High pressure (bar)

plow

Low pressure (bar)

∆p

High pressure minus Low pressure (bar)

ηv

Motor volumetric efficiency

ηmh

Mechanical-hydraulic efficiency

ηt

Motor total efficiency (ηv • ηmh)

Qe	=			Vg • n
				231 •	v
Me	=			Vg •	p •		mh
				2 •
Pe =				Vg • n • p • t
				396 000
n =				Qe • 231 •			v
					Vg
Where:
Qe				Input flow [US gal/min]
Me				Output torque [lb•in]
Pe				Output power [hp]
n				Speed [rpm]
Vg				Motor displacement per rev. [in3/rev]
phigh				High pressure [psi]
plow				Low pressure [psi]
∆p				High pressure minus Low pressure [psi]
ηv				Motor volumetric efficiency
ηmh				Mechanical-hydraulic efficiency
ηt				Motor total efficiency (ηv • ηmh)

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Service Manual

H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

Operation

Shaft rotation direction

Shaft rotation direction is determined with a view from the shaft end.

Rotation direction of the motor will be dependent on the control option used as illustrated below.

In the second number or letter of the control code, 1 means 12 VDC, 2 means 24 VDC, and H means hydraulic.

Controls L1, L2, D1, D2, LH, DH

CCW CW

B A

P006030

Flow into port A

Clockwise

Flow into port B

Counterclockwise

Controls M1, M2, K1, K2, KH, MH

	CCW	CW
A		B
		P006031
Flow into port A	Counterclockwise
Flow into port B	Clockwise

© Danfoss | March 2020

AX152886484369en-000607 | 19

Service Manual

H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

Operation

Controls E1, E2, F1, F2, P1, P2, T1, T2, TA, TH, HE, HF

	CCW	CW
A		B
		P006032
Flow into port A	Counterclockwise
Flow into port B	Clockwise

20 | © Danfoss | March 2020

AX152886484369en-000607

Service Manual

H1 Bent Axis Motors, Size 060/080/110/160/210/250 cc

Operation

Loop flushing shuttle spool

An integral loop flushing shuttle spool is used to separate system A and system B pressures.

System delta pressure will cause the shuttle spool to shift, allowing the low side system pressure to flow to the loop flushing relief valve.

A

B	L2
	A

LFRV

P006033

Legend:

ASystem loop A

BSystem loop B

LFRV	to Loop flushing relief valve

B

P003 437

W Warning

Unintended vehicle or machine movement hazard.

Excessive motor loop flushing flow may result in the inability to build required system pressure in some conditions. Maintain correct charge pressure under all conditions of operation to maintain pump control performance in hydrostatic systems.

© Danfoss | March 2020

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