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“This article has been excerpted from the textbook
“Electro-Hydraulic Components and Systems”
ISBN: 978-0-9977634-2-3
Applied Technology Center
MSOE’s Applied Technology Center™ includes several centers of
excellence, offering state-of-the-art resources and facilities.
Hydraulics Versus Electrical Systems - CHAPTER 1
Author
Dr. Medhat Khalil
1.2.6- Cleanliness of Operation 1.2.7- Maintenance of Operation
The work environment of an electrically-driven machine is
mostly cleaner than the work environment of a hydraulic
driven machine. A hydraulically driven machine, as shown in
Fig. 1.23, may experience oil contamination (1), oil leakage
(2), and dirt on the surfaces of the hydraulic components (3).
Agricultural machines should use biodegradable hydraulic
fluids (4). Hydraulic fluids, other than the biodegradable ones,
are not friendly to the environment and must be recycled (5).
Possible toxicity of hydraulic fluid restricts such systems from
some applications, e.g. food and pharmaceutical industries. Maintenance requirements of an electrically driven machine
are much less than a hydraulically driven machine. Many of
the electrical components are maintenance-free. Examples
are shown in Fig. 1.24, maintenance free motors (1) and
maintenance free hoists (2). Since 80 % of hydraulic system
faults are due to the oil contamination, it is important to keep
such systems well maintained. Additionally, hydraulic fluids
are expensive and require replacement at a specific number
of working hours. The figure shows a dirty oil filter (3) that
must be replaced.
Fig. 1.23 - Cleanliness of Hydraulic-Driven Machine
Fig. 1.24 – Maintenance Requirements for Electric and Hydraulic Machines
The book can be purchased online from www.compudraulic.com
58 58
| may-june
| may-june
2019 2019
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