Danfoss LDT 21, Service Manual

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General Specifications
Features Description
Design U-style HST with variable displacement piston pump and fixed motor
Direction of Rotation Clockwise / Counterclockwise
Pipe Connections Main Pressure ports: SAE O-Ring Boss
Recommended Installation Position Discretionary: The housing must be filled with hydraulic fluid
LDT physical properties
Features Units LDT21 LDT24 LDT32
Displacement Pump side cm
3
/rev [in
3
/rev] 0-21 [0-1.28] 0-24 [0-1.46] 0-31.5 [0-1.92]
Motor side 21 [1.28] 24 [1.46] 31.5 [1.92]
Mass moment of inertia
of rotating components
Pump side kg•m
2
[slug•ft
2
] 0.000878 [0.000648] 0.000869 [0.000641] 0.001400 [0.001033]
Motor side 0.000693 [0.000512] 0.000860 [0.000634] 0.001370 [0.001011]
Weight (dry) kg [lb] 11.2 [24.7] 14.0 [30.9] 21.0 [46.3]
Oil volume Case only liter [US gal] 0.9 [0.24] 1.1 [0.29] 1.4 [0.38]
With passage 1.0 [0.26] 1.2 [0.31] 1.5 [0.41]
Installation See
Rotation Clockwise Clockwise Clockwise
Ports (ISO 11926-1) See
Input shafts and PTO shafts
Output shaft
Control type
LDT Operating Parameters
Features Units LDT21 LDT24 LDT32
Input speed Minimum min
-1
(rpm) 500 500 500
Rated 3600 3400 3200
Maximum 3800 3800 3400
Output speed Minimum min
-1
(rpm) 500 500 500
Rated 3600 3400 3200
Maximum 3800 3800 3400
System pressure Maximum working
pressure
bar [psi] 250 [3626] 300 [4350] 300 [4350]
Maximum pressure 280 [4061] 345 [500] 345 [500]
Input power Maximum kw [hp] 22 [30] 26 [35] 29.8 [40]
Charge pressure Minimum bar [psi] 5 [73] 5 [73] 5 [73]
Case pressure Rated bar [psi] 1 [14.5] 1 [14.5] 1 [14.5]
Maximum 3 [43.5] 3 [43.5] 3 [43.5]
Service Manual
LDT 21/24/32 Closed Circuit Axial Piston Transmission
Technical Specifications
14 | © Danfoss | June 2022 AX417167456877en-000101