MAINTENANCE
92
Lift System Operation
WARNING
Lower the lift mechanism completely. Never allow
anyone under a raised carriage. Do not put any part
of your body in or through the lift mechanism unless
all parts of the mast are completely lowered and the
engine is STOPPED.
Before making any repairs, use blocks and chains on
the mast weldments and carriage so that they can not
move. Make sure the moving parts are attached to a
part that does not move.
Do not try to find hydraulic leaks by putting hands on
pressurized hydraulic components. Hydraulic oil can
be injected into the body by the pressure.
Do the following checks and inspections:
1. Check for leaks in the hydraulic system. Check the
condition of the hydraulic hoses and tubes.
NOTE:
Some parts of the mast move at different speeds
during raising and lowering.
2. Slowly raise and lower the mast several times with-
out a load. Raise the mast to its full extension
height at least once. The mast components must
raise and lower smoothly in the correct sequence.
3. The inner weldments and the carriage must lower
completely.
4. Raise the mast one metre (three feet) with a capac-
ity load. The inner weldments and the carriage must
raise smoothly. Lower the mast. All moving compo-
nents must lower smoothly.
5. Lower the load to approximately 0.3 metre (one
foot). Tilt the mast forward and backward. The mast
must tilt smoothly and both tilt cylinders must stop
evenly.
6. Check that the controls for the attachment operate
the functions of the attachment. (See symbols by
each of the controls.) Make sure all of the hydraulic
lines are connected correctly and do not leak.
Inching/Brake Pedal
Push on the inching/brake pedal. The service brakes must
be applied before the inching/brake pedal reaches the
floor plate. Full application of the inching/brake pedal ap-
plies the service brakes and puts the transmission in
NEU-
TRAL
. When the inching/brake pedal is fully applied, a
Property of American Airlines
