ATN PIAF 10E 2018, Safety And Maintenance Manual

Page: 60 / 81

SAFETY AND MAINTENANCE MANUAL
1NO0055UK-00
PIAF 10 E
60
DANGER
BEFORE ANY MAINTENANCE, ENSURE
THE
ELECTRIC SYSTEM IS
DISCONNECTED FROM THE POWER
SUPPLY.
2.1. HYDRAULIC POWER UNIT
DESCRIPTION
The machine is fitted with a power unit consisting of
a pump and a 24V fan-cooled motor. It is located on
the left hand side of the machine.
GENERAL MAINTENANCE
Gear hydraulic pumps deliver reliable performance over a long period of time if operating in a
properly maintained system. This includes using clean oil of correct grade, regular filter
replacement, and frequent inspections of the system components. If a pump fails, it is however
important to determine all the causes and eliminate them to prevent repeated breakdowns.
GENERAL INFORMATION
ABRASIVE WEAR CAUSED BY FINE PARTICLES
Abrasive wear caused by fine particles is the most frequent cause of pump failure. Its symptom is
a gradual reduction in power and therefore of the
machine’s performances. Fine particles or other
foreign bodies circulating through the system cause wear on all components and can be noticed
on pressure plates, housings and shaft bearing areas. Always clean tank caps, funnels and areas
around the filler neck before opening the tank. Cap every disconnected hose, fitting and various
openings.
AERATION OR CAVITATION
Aeration occurs when air mixes with the oil. Air can enter the system through a small suction leak
or by agitation of the oil surface in the tank. Surface agitation occurs when the return oil is dumped
back above the oil level. This can occur when the oil level is too low.
Cavitation is the formation and collapse of vapour bubbles in the oil. This is the result of restricted
pump suction. Cavitation occurs usually when the oil is cold. A pump either cavitating or function
with aerated fluid is noisy and the system functions in a jerky manner.
LACK OF OIL
When a failure is due to lack of oil, deteriorations are usually quick. This kind of breakdown can
occur for two reasons;
(a) the oil level is low in the tank, or (b) there is a leak in the suction hose.