Hydrostatic drives are extremely expensive, the least dirt tolerant, and in some cases the most complex part of mobile equipment hydraulics today. From the manufacturers side, this type of drive offers dynamic braking, variable speed, variable torque, and variable horsepower in a very compact unit. With an increasing frequency of these drives in your equipment, a sound understanding of these drives will be essential to an efficient and cost effective maintenance program.
This course is designed to present troubleshooting techniques, operating principles, and maintenance procedures that deal specifically with hydrostatic drives. Our teaching methods include actual components, visual aids, and an actual working drive.
Attendees should bring note taking material and a calculator. Class size will be limited to 10 people and will require a minimum of 8 hours, 16 hours maximum.
I. Types Of Drives
A. Open Loop
B. Closed Loop
C. Piston Pumps
D. Fixed/Fixed
E. Variable/Fixed
F. Fixed/Variable
G. Variable/Variable
II. System Operation and Components
A. Reservoir
B. Suction Filter
C. Charge Pump
D. Charge Relief (s)
E. High Pressure Relief
F. Shuttle Valve
G. Cooler
III. Pump and Motor Volume Control
A. Manual
B. Mechanical Servo
C. Electronic Servo / Proportional Valve
D. Pressure Compensator
IV. Pump and Motor Volume Control
A. Inlet Condition
B. Failure In One Direction
C. Failure In Both Directions
D. System Overheats
E. Case Drain Pressure
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