SkyTrak 8042 Service Manual - Manual (Page 419)

Hydraulic System
8.4 Model 8042, 10042, 10054 Legacy Rev. 10/03
8.2 SAFETY INFORMATION
Petroleum-based hydraulic fluids are used in this vehicle.
The temperature of hydraulic fluid increases during the
operation of various hydraulic functions. A heated
petroleum-based hydraulic fluid presents a fire hazard,
especially when an ignition source is present. Hydraulic
fluid has a flash point that ranges from 300-600° F
(150-318° C) and an auto-ignition temperature of 500-750° F
(262-402° C).
Accordingly, periodically inspect all hydraulic system
components, hoses, tubes, lines, fittings, etc. Carefully
examine any deterioration and determine whether any
further use of the component would constitute a hazard.
If in doubt, replace the component.
Operate the hydraulic controls after the engine has
stopped to relieve trapped pressure.
Note: Residual pressure may remain in hydraulic
cylinders, hoses, valve bodies, components, etc. If the
hydraulic lines going to or coming from a component are
taut, slowly and cautiously relieve (“bleed off”) pressure.
Whenever you disconnect a hydraulic line, coupler, fitting
or other component, slowly and cautiously loosen the part
involved. A hissing sound or slow seepage of hydraulic
fluid may occur in most cases. After the hissing sound
has ceased, continue removing the part. Any escaping oil
should be directed into an appropriate container. Cap or
otherwise block off the part to prevent further fluid seepage.
Hydraulic system maintenance will, at times, require that
the engine be operated. Always follow safety precautions.
A major cause of hydraulic component failure is
contamination. Keeping the hydraulic fluid as clean as
possible will help avoid downtime and repairs. Sand, grit
and other contaminants can damage the finely machined
surfaces within hydraulic components. If operating in an
exceptionally dirty environment, change filters and
inspect the fluid more often. When servicing the system,
cap or plug hydraulic fittings, hoses and tube assemblies.
Plug all cylinder ports, valves and the hydraulic reservoir,
and pump openings until installation occurs. Protect
threads from contamination and damage.
Some hydraulic functions are actuated by interfacing with
electrical system components (switches, solenoids and
sensors). When the hydraulic system is not functioning
properly, check the electrical aspect of the malfunctioning
circuit also. Refer to Section 9.7, “Electrical System
Troubleshooting,” in this manual.
WARNING:
DO NOT service the vehicle
without following all safety precautions as
outlined in Section 1, “Safety Practices,” of this
manual. Failure to follow the safety practices
may result in death or serious injury.
WARNING:
Wait for hydraulic fluid to cool
before servicing any hydraulic component. Hot
hydraulic fluid can cause severe burns.
WARNING:
Relieve hydraulic pressure
before servicing any hydraulic component.
Escaping hydraulic fluid under pressure can
penetrate the skin causing death or serious injury.
WARNING:
Before starting the engine,
verify that all hydraulic connections are
properly tightened. Escaping hydraulic fluid
under pressure can penetrate the skin causing
death or serious injury.