Nordco Super Claws LS-2, Руководство по эксплуатации и обслуживанию

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TROUBLESHOOTING
Super Claws Model LS-2
Section 6-8
MAR/2006 (4945-3500)
LOCATING LEAK SOURCES
Petroleum oils are used in most hydraulic application to lubricate parts as well as transmit
power. As oil temperature increases, however, the lubricating film thins out. The result is
rubbing parts supported by the oil film move closer together; friction and wear increase;
seal materials age more quickly, become stiff and hard, and may readily permit leakage.
The first step in locating leaks is to eliminate the possibility that an over-filled reservoir or
spill created the "suspected" leak. The next step would be to clean the suspected area
and watch. Leaks usually occur in fittings, hoses, O-rings, and other seals.
Most leaks occur at fittings, but too often, finding the fitting that is leaking is difficult
because the fluid runs along the hose and drips off at some other point. Leaks in high
pressure lines sometimes are difficult to pin-point because the fluid comes out as a mist.
Once you find the location of a leak, the specific cause has to tbe determined before it can
be corrected. A scratch in a fitting seat or a cut in a seal lip that is big enough to leak
excessively can still be too small to find with the naked eye. The use of a magnifying
glass would assist you.
HOSE LIFE
Hose leakage or failure many times occurs where the end fitting grips the hose. Check
the system for pressure spikes or surge. If bulges or bubbles occur on a flexible hose, a
leak is taking place within the layers. The hose should be replaced.
High oil temperatures (over 200 degrees Fahrenheit, 93 degrees Celcius) quickly harden
or stiffen a rubber hose. When pressure pulses flex a hardened hose, it fails by cracking.
Every increase of 25
°
F (14
°
C) cuts hose life in half. Use a replacement hose rated for
actual fluid temperatures. Keep a log of hose use so replacement can be made before
failure occurs.
If a hose is installed with a twist in it, high operating pressures tend to force it straight.
This can loosen the fitting or even burst the hose at the point of the strain.
The Functional Hydraulic Schematic for this machine can be behind the "Hydraulics" tab
in this manual.