Danfoss LPV User Manual Download

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Technical Information

Axial Piston Pumps

LPV

powersolutions.danfoss.com

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Summary of Contents for LPV

Page 1: ...Technical Information Axial Piston Pumps LPV powersolutions danfoss com ...

Page 2: ...chanism changes AF October 2008 added serial number plate drawing AE April 2008 changes to auxilliary mounting dimensions AD August 2007 revised endcap and loop flusing options in model code AC May 2007 correct displacement errors AB July 2006 First edition A 0 Technical Information LPV Axial Piston Pumps 2 Danfoss September 2017 520L0954 BC00000044en US0102 ...

Page 3: ...aft torque rating and spline lubrication 13 Understanding and minimizing system noise 13 Sizing equations 14 Fluids 14 Filtration system 15 Charge filtration 16 Suction filtration 16 Operation HPRV High pressure relief valve 17 Bypass function 17 CPRV Charge pressure relief valve 17 Loop flushing valve 18 Neutral return mechanism 18 Technical specifications Specifications 20 Product coding LPV Mod...

Page 4: ...n space requirements Single piece rigid housing to reduce noise and leak paths Integrated neutral return mechanism for simplified installation Optional loop flushing for circuit flexibility Reliability Designed to rigorous standards Proven in both laboratory and field Manufactured to rigid quality standards Long service life Typical applications Turf care Utility vehicles LPV product specification...

Page 5: ...n USA Place of Manufacture Part Number Serial Number Model Code LPVAAADAEACCABDDD P107852 83002847 A084012345 RAFFBNNN Technical Information LPV Axial Piston Pumps General description Danfoss September 2017 520L0954 BC00000044en US0102 5 ...

Page 6: ...te reverses the flow of fluid from the pump reversing the direction of rotation of the motor output LPV pumps have an internal neutral return mechanism for ease of installation and are available with optional loop flushing for circuit flexibility LPV pumps can receive charge flow from an auxiliary circuit or from a gear pump mounted on the auxiliary mounting pad LPV pumps feature an SAE A auxiliar...

Page 7: ...r Charge pump Reservoir Heat exchanger Heat exchanger bypass Charge relief valve Bypass valve P100586 The diagram shows an LPV pump driving an OMR motor The system shown uses an external charge pump and external filter Charge pressure relief valves high pressure relief valves and loop flushing valves are shown separated from the pump to provide clarity to the hydraulic system LPV Pump schematic di...

Page 8: ...ar below Pressure Ratings System pressure is the differential pressure between high pressure system ports It is the dominant operating variable affecting hydraulic unit life High system pressure which results from high load reduces expected life Hydraulic unit life depends on the speed and normal operating or weighted average pressure that can only be determined from a duty cycle analysis Applicat...

Page 9: ...pressure are additive to case pressure Independent braking system W Warning Unintended vehicle or machine movement hazard The loss of hydrostatic drive line power in any mode of operation forward neutral or reverse may cause the system to lose hydrostatic braking capacity You must provide a braking system redundant to the hydrostatic transmission sufficient to stop and hold the vehicle or machine ...

Page 10: ...oop flushing Closed circuit systems may require loop flushing to meet temperature and cleanliness requirements A loop flushing valve removes hot fluid from the low pressure side of the system loop for additional cooling and filtering Ensure the charge pump provides adequate flow for loop flushing and the loop flushing valve does not cause charge pressure to drop below recommended limits LPV utiliz...

Page 11: ...tation and which system port has flow out Contact Danfoss for a bearing life review if external side loads are present You can calculate the maximum allowable radial load Re using the formula below the maximum external moment Me from the table on the next page and the distance L from the mounting flange to the load Re Me L Avoid thrust loads in either direction If continuously applied external rad...

Page 12: ...tion on hydraulic unit life see Pressure and Speed Limits BLN 9884 Mounting flange loads Estimating overhung load moments Adding auxiliary pumps and or subjecting pumps to high shock loads may result in excessive loading of the mounting flange Applications which experience extreme resonant vibrations or shock may require additional pump support You can estimate the overhung load moment for multipl...

Page 13: ...rmining the operating life of a splined drive connection Plug in or rigid spline drive installations can impose severe radial loads on the shaft The radial load is a function of the transmitted torque and shaft eccentricity Increased spline clearance will not totally alleviate this condition but increased spline clearance will prevent mechanical interference due to misalignment or radial eccentric...

Page 14: ... in the operating range if possible avoid them Sizing equations Use these equations to help choose the right pump size and displacement for your application An evaluation of the machine system to determine the required motor speed and torque to perform the necessary work function initiates the design process Refer to Selection of drive line components BLN 9985 for a more complete description of hy...

Page 15: ...and capacity You can express measured filter efficiency with a Beta ratio1 βX For simple suction filtered closed circuit transmissions and open circuit transmissions with return line filtration a filter with a β ratio within the range of β35 45 75 β10 2 or better should be satisfactory For some open circuit systems and closed circuits with cylinders being supplied from the same reservoir we recomm...

Page 16: ...pass the filter Avoid working with an open bypass for an extended period We recommend a visual or electrical bypass indicator Proper filter maintenance is mandatory Charge filtration Reservoir Filter with bypass Charge pump Charge relief valve To pump case To Low Pressure side of loop and servo control Strainer P106279 Suction filtration The suction filter is placed in the circuit between the rese...

Page 17: ...h pressure relief valve for extended periods may damage the pump HPRV valve P106273 Bypass function The LPV contains a dedicated bypass valve the bypass function is activated when the bypass valve is mechanically backed out 3 full turns maximum The bypass function allows a machine or load to be moved without rotating the pump shaft or prime mover Bypass valve P106286 C Caution Excessive speed or e...

Page 18: ...orporate an optional integral loop flushing valve which removes heat and contaminants from the main loop LPV utilizes a special loop flushing spool design On dual path systems take special care to verify acceptable performance Loop flushing valve P106276 Neutral return mechanism The neutral return mechanism mechanically returns the pump to zero displacement A cam allows precise zero displacement a...

Page 19: ...w P106277 Adjusting screw Lock seal nut Neutral return mechanism Shaft Swashplate Neutral return arm Adjusting cam P106278 Technical Information LPV Axial Piston Pumps Operation Danfoss September 2017 520L0954 BC00000044en US0102 19 ...

Page 20: ...s kg m slug ft 0 001670 0 0012 0 001580 0 00120 0 001530 0 0011 Weight kg lb 23 51 Rotation Clockwise counter clockwise Mounting SAE B 2 bolt Auxiliary mounting SAE J744 A 9T SPCL 11T System ports type 1 1 16 12 UNF 2B ORB System ports location Twin radial Control types Direct displacement control Shafts Splined SAE 13 tooth 15 tooth Case drain ports 1 1 16 12 SAE ORB Operating parameters Displace...

Page 21: ...s Fluid specifications Feature Unit Displacement cm in 25 1 53 30 1 83 35 2 14 Viscosity Minimum mm2 sec SUS 7 47 Recommended range 12 60 66 278 Maximum 1600 7500 Temperature Range2 Minimum C F 40 40 Rated 82 180 Maximum intermittent 100 212 Filtration Cleanliness per ISO 4406 22 18 13 Efficiency charge pressure filtration β ratio β15 20 75 β10 10 Efficiency suction filtration β35 45 75 β10 2 Reco...

Page 22: ...ver 6 6 Windrower 6 5 Aerial lift 6 4 Turf care vehicle 6 4 Vibratory roller 6 10 Applications experiencing extreme resonant vibrations may require additional pump support Refer to System design parameters on page 10 for information concerning mounting flange loads Technical Information LPV Axial Piston Pumps Technical specifications 22 Danfoss September 2017 520L0954 BC00000044en US0102 ...

Page 23: ...andard shaft seal E Input Shaft Configuration Code Description A 13 Tooth splined 16 32 pitch B 15 Tooth splined 16 32 pitch C 20 Tooth splined 24 48 pitch F Rotating kit rotation and valveplate Code Displacement A CW rotation 25 cm rev 1 50 in rev B CW rotation 30 cm rev 1 83 in rev C CW rotation 35 cm rev 2 14 in rev D CCW rotation 25 cm rev 1 50 in rev E CCW rotation 30 cm rev 1 83 in rev F CCW...

Page 24: ...hing 3 8 l min 1 US gal min at 260 psid charge RH control SAE A flange 90 Deg DC No loop flushing RH control SAE A flange 90 Deg EA High loop flushing 7 6 l min 2 US gal min at 260 psid charge RH control SAE B flange 90 Deg EB Low loop flushing 3 8 l min 1 US gal min at 260 psid charge RH control SAE B flange 90 Deg EC No loop flushing RH control SAE B flange 0 Deg GA High loop flushing 7 6 l min ...

Page 25: ...tion Code Description DR Direct displacement control right side DL Direct displacement control left side P Control Code Description A DDC R Control Orifice Diameter Code Description FF N A S Housing and Auxiliary Mounting Code Description A SAE A 11T spline running cover B SAE A 9T spline running cover E SAE B 13T spline running cover N SAE A none running cover T Special Hardware Features Code Des...

Page 26: ...left side control input Features and benefits Simple low cost design Pump output is maintained regardless of load Pump will return to neutral if control input is removed if equipped with optional neutral return mechanism Control handle requirements Maximum allowable trunnion torque is 79 1 N m 700 lbf in Minimum available centering moment is 5 7 N m 50 lbf in The actual value will vary due to the ...

Page 27: ...19 pitch diameter 30 pressure angle 15 teeth 16 32 pith fillet root side fit P106284 41 2 0 8 1 62 0 03 18 5 0 09 0 7283 0 0035 7 9 0 8 0 31 0 03 C 20 tooth spline 24 48 pitch ANSI B92 1 1966 Class 6e 241 2133 P108847 6 9 Max 0 27 21 166 0 8333 pitch diameter 30 pressure angle 20 teeth 24 48 pitch fillet root side fit 48 6 Max 1 91 22 48 0 5 0 89 0 02 See Input shaft torque rating and spline lubri...

Page 28: ...4 73 1 761 20 1 0 792 1 96 0 77 Ø107 82 4 245 Ø101 65 4 002 Dimensions in mm in The auxiliary pad operates under case pressure Use an O ring to seal the auxiliary pump mounting flange to the pad The combination of auxiliary shaft torque and main pump torque must not exceed the maximum pump input shaft rating The table in Input shafts on page 27 gives input shaft torque ratings for each frame size ...

Page 29: ... 0 700 D 31 75 1 250 E 17 78 0 700 The 11 tooth auxiliary pad option requires a special short shaft on the mating pump due to reduced clearance to the LPV pump shaft Technical Information LPV Axial Piston Pumps Features and options Danfoss September 2017 520L0954 BC00000044en US0102 29 ...

Page 30: ...pl F1 R1 111 1 4 37 82 6 3 25 128 8 5 07 2X 35 1 1 38 1 1 16 12 SAE straight thread O ring boss system port A 1 1 16 12 SAE straight thread O ring boss system port B 1 1 16 12 SAE straight thread O ring boss case drain alternate Loop flushing valve location HPRV valve P106281 Trunion 19 84 dia 0 781 45 15 82 0 623 2 Places CONTROL TRUNNION DETAIL 2X 3 8 16 x 1 UNC THD hole is 20 mm deep Technical ...

Page 31: ...X 73 2 87 CW P106281 CCW HPRV valve Bypass valve Loop flushing valve 2X Ø14 3 0 25 0 12 0 563 0 010 0 005 LPV Schematic L1 L2 Charge pressure inlet Port A Port B P106270 Technical Information LPV Axial Piston Pumps Installation drawings Danfoss September 2017 520L0954 BC00000044en US0102 31 ...

Page 32: ...utions ApS Nordborgvej 81 DK 6430 Nordborg Denmark Phone 45 7488 2222 Danfoss Power Solutions US Company 2800 East 13th Street Ames IA 50010 USA Phone 1 515 239 6000 Danfoss Power Solutions Trading Shanghai Co Ltd Building 22 No 1000 Jin Hai Rd Jin Qiao Pudong New District Shanghai China 201206 Phone 86 21 3418 5200 Danfoss can accept no responsibility for possible errors in catalogues brochures a...

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