33
Release system pressure before attempting to
make adjustments or repairs.
Hydraulic fluid expands when heated. This
raises the pressure in an unventilated tank.
Release the tank pressure before removing the
cap completely. Failure to do so may cause the
oil to shoot out of the tank very rapidly and
cause severe burns.
Warning! If hydraulic fluid escapes, the boom or
crane can fall immediately. Make sure the
ground or blocking is supporting the boom before
performing any maintenance or repair. Do not
rely on the hydraulic fluid to support the boom or
crane.
Contaminants in a hydraulic system affect
operation and will result in serious damage to the
system components. Dirty hydraulic systems are
a major cause of component failures.
If evidence of foreign particles is found in the
hydraulic system, flush the system.
Disassemble and assemble hydraulic
components on a clean surface.
Clean all metal parts in a nonflammable cleaning
fluid. Then lubricate all components to aid in
assembly.
When installing metal hydraulic tubes, tighten all
bolts finger tight. Then , in order, tighten the
bolts at the rigid end, the adjustable end, and the
mounting brackets. After tubes are mounted,
install the hoses. Connect both ends of the hose
with all bolts finger tight. Position the hose so it
does not rub the machine or another hose and
has a minimum of bending and twisting. Tighten
bolts in both couplings.
Due to manufacturing methods, there is a natural
curvature to a hydraulic hose. The hose should
be installed so any bend is with this curvature.
Hydraulics - Electrical 33
Chapter 8 - Hydraulics - Electrical
WARNING!
Please read the following section before
performing any work on the
hydraulic/electrical system of your crane.
This section contains vital safety information
and maintenance guidelines for your
crane. If questions should arise, please
contact Stellar Customer Service at 800-
321-3741
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