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Related Manuals for Danfoss LDU24
Summary of Contents for Danfoss LDU24
- Page 1 Service Manual LDU20/24 Closed Circuit Axial Piston Transmission www.danfoss.com...
- Page 2 Table of revisions Date Changed June 2021 Added Size 24, Changed document number from 'AX00000049' and '11071687' to 0304 'AX152886481311' July 2017 Updated to Engineering Tomorrow 0202 March 2014 Danfoss layout January 2011 First edition © Danfoss | June 2021 AX152886481311en-000304...
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Page 3: Table Of Contents
Secure the unit..................................... 6 Safety Precautions....................................6 Unintended machine movement............................6 Flammable cleaning solvents..............................6 Fluid under pressure.................................. 6 Personal safety..................................... 6 Hazardous material..................................6 Symbols Used in Danfoss Literature............................7 General Description Basic Design......................................8 Key Features....................................... 8 Typical Applications..................................8 Schematic Diagram..................................8 Operation HPRV (High Pressure Relief Valve) ............................. - Page 4 Charge Check/HPRV Adjustments............................21 Checking for proper charge check/HPRV operation....................21 Minor Repair Shaft Seals......................................22 Removal......................................22 Inspection....................................22 Assembly......................................22 Charge Check/HPRV..................................23 Removal......................................23 Inspection....................................23 Reassembly....................................23 Bypass Valve.....................................24 Removal......................................24 Inspection....................................24 Reassembly....................................24 Torque Chart Plug Size and Torque Chart................................ 25 © Danfoss | June 2021 AX152886481311en-000304...
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Page 5: Overview
A worldwide network of Danfoss Authorized Service Centers is available for major repairs. Danfoss trains and certifies Authorized Service Centers on a regular basis. You can locate your nearest Authorized Service Center using the distributor locator at www.sauer-danfoss.com. -
Page 6: Secure The Unit
Protect yourself from injury. Use proper safety equipment, including safety glasses, at all times. Hazardous material Warning Hydraulic fluid contains hazardous material. Avoid prolonged contact with hydraulic fluid. Always dispose of used hydraulic fluid according to environmental regulations. © Danfoss | June 2021 AX152886481311en-000304... -
Page 7: Symbols Used In Danfoss Literature
Service Manual LDU20/24 Closed Circuit Axial Piston Transmission Introduction Symbols Used in Danfoss Literature WARNING may result in injury CAUTION may result in damage to product or property Non-reusable part, use a new part External hex head Internal hex head... -
Page 8: General Description
Best in class Efficiency by Female Piston & Male slipper design…Can reach approximately 80% overall efficiency • Longer life kit, Higher Duty capability in most compact design in this class of HST • Low operating force • Serviced by a Worldwide Network of Danfoss Typical Applications • Compact utility tractor • Turf care •... -
Page 9: Operation
A cross section and characteristics are shown above. The charge check valves with orifice are available with 0.85mm orifice today. This option is allowable for only high pressure port when vehicle goes in reverse. © Danfoss | June 2021 AX152886481311en-000304 | 9... -
Page 10: Bypass Function
20 % of maximum speed or for longer than 3 minutes. When the bypass function is no longer needed, reseat the bypass valve to the normal operating position. Bypass Function Bypass Valve System Pressure System Pressure P400006 10 | © Danfoss | June 2021 AX152886481311en-000304... -
Page 11: Cprv (Charge Pressure Relief Valve)
Installation drawings in LDU20/24 Technical Information Manual BC152886483777. Warning With no external forces applied to the swashplate trunnion, internal hydraulic forces may not return the swashplate to the neutral position under all conditions of operation. © Danfoss | June 2021 AX152886481311en-000304 | 11... -
Page 12: Operating Parameters
All pressure limits are differential pressures referenced to low loop (charge) pressure.Subtract low loop pressure from gauge readings to compute the differential. Input Power Maximum continuous input power is the highest recommended input power to HST excluding PTO output power. 12 | © Danfoss | June 2021 AX152886481311en-000304... -
Page 13: Charge Pressure
Don't exceed it. Measure maximum temperature at the hottest point in the system. Refer to Fluid Specifications in LDU20/24 Technical Information Manual BC152886483777. Ensure fluid temperature and viscosity limits are concurrently satisfied. © Danfoss | June 2021 AX152886481311en-000304 | 13... -
Page 14: Technical Specifications
[psi] Maximum pressure 345 [500] Input power Maximum kw [PS] 22 [30] 26 [35] Charge pressure Minimum bar [psi] 5 [73] Rated 1 [14.5] Case pressure bar [psi] Maximum 3 [43.5] 14 | © Danfoss | June 2021 AX152886481311en-000304... -
Page 15: Fluid Specifications
Filtration (recommended minimum) Cleanliness per ISO 4406 22/18/13 Efficiency (charge pressure filtration) b - ratio b 15-20=75(b 10≥10) Efficiency (suction and return line b 15-20=75(b 10≥10) filtration) Rercommended inlet screen mesh µm 100-125 size © Danfoss | June 2021 AX152886481311en-000304 | 15... -
Page 16: Fluid And Filter Maintenance
Change filters when changing fluid or when the filter indicator directs. Replace all fluid lost during filter change Warning Hydraulic fluid contains hazardous material. Avoid contact with hydraulic fluid. Always dispose of used hydraulic fluid according to state, and federal environmental regulations. Never reuse hydraulic fluid. 16 | © Danfoss | June 2021 AX152886481311en-000304... -
Page 17: Pressure Measurements
MA1, MA2, MB1, MB2 3/4-16 UNF 7/8 hex wrench System Pressure 500 [5000] 9/16-18 UNF 1/4 internal hex Charge Pressure 50 [1000] Port Locations (REVERSE SIDE) (REVERSE SIDE) L2 (REVERSE SIDE) P108517 © Danfoss | June 2021 AX152886481311en-000304 | 17... -
Page 18: Initial Startup Procedure
Charge pressure may decrease slightly during forward or reverse operation. 13. Check that the reservoir is full. Remove charge pressure gauge and cap charge pressure port (M3). The transmission is now ready for operation. 18 | © Danfoss | June 2021 AX152886481311en-000304... -
Page 19: Troubleshooting
Measure system pressure. Continue to next step. move load. Charge check/HPRVs Low system pressure does not provide enough power to Repair or replace charge check/HPRVs move load. Control linkage Linkage operating improperly. Repair/replace linkage © Danfoss | June 2021 AX152886481311en-000304 | 19... -
Page 20: System Noise Or Vibration
Inlet vacuum is too high resulting in reduced system Measure charge inlet vacuum. Inspect line for proper sizing. pressure. Replace filter. Confirm proper bypass operation. Control linkage Linkage operating improperly Repair or replace control linkage 20 | © Danfoss | June 2021 AX152886481311en-000304... -
Page 21: Required Tools And Standard Procedures
HST operation. The Charge Check/HPRVs are preset at the factory. No adjustment is possible. Checking for proper charge check/HPRV operation If you suspect Charge Check/HPRV malfunction, swap valves and test operation. If the symptoms switch direction, replace the faulty valve. © Danfoss | June 2021 AX152886481311en-000304 | 21... -
Page 22: Minor Repair
3. Using a snap ring pliers, install retaining ring (F125, F215, H125, H215). Shaft Seals F115 F210 F125 F215 H115 H210 P108 483E P108 165E H215 H125 22 | © Danfoss | June 2021 AX152886481311en-000304... -
Page 23: Charge Check/Hprv
4. Operate vehicle/machine through full range of controls to ensure proper operation. Check for leaks. Charge Check/HPRV 24 mm 78.4 Nm [58 lbf-ft] P120 P100 P130 P110 N110 N130 N100 N120 24 mm 78.4 Nm [58 lbf-ft] P108 167E © Danfoss | June 2021 AX152886481311en-000304 | 23... -
Page 24: Bypass Valve
1. Lubricate and install new O-ring (M110, M130) and backup ring (M120) onto cartridge. 2. Install the bypass valve cartridge using a 17mm hex wrench. Torque to 12 N•m [9lbf•ft]. Bypass Valve M130 M110 M120 M100 17 mm P108 166E 12 Nm [9 lbf-ft] 24 | © Danfoss | June 2021 AX152886481311en-000304... -
Page 25: Torque Chart
78.4 [57.8] J400 9/16-18 UNF 1/4 internal hex 35 [25.8] Y300 3/4-16 UNF 5/16 internal hex 39.2 [29] Plugs J200 J250 (REVERSE SIDE) J400 J300 J350 (REVERSE SIDE) Y300 Y300 (REVERSE SIDE) P108482 © Danfoss | June 2021 AX152886481311en-000304 | 25... - Page 26 Phone: +86 21 2080 6201 Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
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