39
HYDRAULIC SYSTEMS (CONT’D)
If you are struck by escaping hydraulic fluid
under pressure, serious injury can occur if
proper medical treatment is not administered
immediately.
During operation,hydraulic fluid and air in an
unvented hydraulic tank becomes heated
and will tend to expand.This will raise the
pressure inside an unvented hydraulic tank.If
the filler cap is removed rapidly, the pressure in
the tank can force the oil out of the tank very
rapidly. The hydraulic fluid may be very
hot and may cause severe burns. Always
relieve tank pressure before removing the cap
completely.Consult the manufacturer’s
instructions for the correct procedure.
When adding fluid to any system, be sure to
use the fluid recommended by the manufacturer.
Certain fluids, when mixed,may destroy seals
causing loss of control and possible personal
injury.
Keep hydraulic relief valve settings set to
the manufacturer’s recommendations.Excessive
pressures could result in structural or
hydraulic failures.Low pressure could result in
loss of control.Either condition could cause
personal injury or death.
Be sure the engine is stopped and machine is
properly locked out and controls tagged,before
working on a machine.Only run engine when it is
essential,as in the case of pressure adjustments,
lubrication,or tests. Follow the manufacturer’s
recommendations when making adjustments.
Never resume operation until satisfactory
adjustments have been made. The operator
must follow the mechanic’s instructions when
adjustments are being made or machine is
being serviced.
PERFORM MAINTENANCE SAFELY
KE40246P3 6/9/05 3:19 PM Page 39
40
TIRE INSPECTION
Recommended air pressure must be maintained
in every tire. Daily checks assure that inflation is
correct. If your periodic check discloses a tire that
is continuously losing air,a leak is indicated and
must be repaired.(FIG. 43)
During your pressure checks,also inspect for:
• Objects wedged between or embedded in tires.
• Missing valve caps and wheel lugs.
• Cuts,tears, and breaks that may need repair.
• Abnormal or uneven wear.
• Damaged or poor fitting rim or rim flanges.
• Projecting body hardware,loose fender bolts,
spring clips – anything that could contact a tire.
Do not burn or weld on wheels or rims.
PERFORM MAINTENANCE SAFELY
KE40246P3 6/9/05 3:19 PM Page 40
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