HHD ACA Transit Mixer Eaton Vickers 3933 4633 5433 6433 7630 motor 3923 7620 4623 5423 6423 Pump 
3933-092, 4633-029, 5433-138, 6433-187, 7630-014, 3333, 3933, 4633, 5433, 6433, 7630 fixed motor
5423-518, 5423-715, 5433-138, and 6423-279, 6423-533, 6433-042 Eaton 5423 6423 Pump Motor of Concrete mixer truck  Pump Heavy Duty Hydrostatic Transmissions  
Variable Displacement Axial Piston Mixing/ Mixer Pump
The variable displacement pump provides a flow of high pressure oil. Pump output flow can be varied to obtain the desired motor output speed.

Advanced cylinder barrel design - permits high speed and pressure.
Fixed clearance slipper hold down - on Models 39 through 64 allows operation at high speed and reduces friction. Model 76 is a ball guide unit.
Pistons - have long engagement with cylinder bore resulting in low leakage. 
Drive shafts: a wide variety of options are available to suit every need.
High strength swash plates on variable pumps and motors: resist deflection under high load.
High strength cast iron housings: provide greater noise damping and wall strength.
High flow check valves in pumps: keep the system primed with minimal pressure drop.  

Drive shafts: a wide variety of options are available to suit every need.
High strength swash plates on variable pumps and motors: resist deflection under high load.
High strength cast iron housings: provide greater noise damping and wall strength.
High flow check valves in pumps: keep the system primed with minimal pressure drop.
Typical Applications as follow:
Construction
1.Transit Mixer
2.Road Roller
3.Paver
4.Motor Grader
5.Loader
6.Dozer

Agriculture
• Tractor
• Harvester
• Windrower
• Sprayer
• Planter