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TM 10-3930-671-24
Hydraulic Sump
Fluid Level Check
NOTE
Check the hydraulic sump tank oil level with:
•
Truck on a level surface.
•
Engine stopped.
•
Upright in a vertical position.
•
Fork carriage fully down.
•
Oil at operating temperature.
1.
Pull the dipstick out, wipe it with a clean wiper,
and push it back into the dipstick tube. Remove
the dipstick again and check the oil level
indication.
2.
The hydraulic system oil level should be between
the oil level markings on the dipstick.
NOTE
Approximately 1.0 gal (3.BL) of hydraulic
oil is required to fill the hydraulic tank
from the L (Low) mark to the F (Full)
mark. DO NOT OVERFILL.
3.
Add recommended fluid only, as required.
NOTE
Remove or pull dipstick part way out
to vent air from tank while filling.
4.
Check the time (hours) of usage and condition of
the
hydraulic
fluid
(age,
color
or
clarity,
contamination, etc.). Replace fluid, as required.
Sump Tank Breather Maintenance
1.
Remove the hydraulic sump tank breather/fill cap
and inspect for contamination and damage.
2.
Replace the breather/fill cap every 500 hours, or
as required by operating conditions.
Oil Filter Maintenance
1.
Check the PM time interval for need to change
hydraulic oil filter.
2.
Change (replace) the hydraulic oil filter every 500
hours and at every sump oil change, or as
required by operating conditions.
3.
Check for leaks after installation of filter when
truck is started.
WARNING
Do not use your hands to check for
hydraulic leakage. Use a piece of
cardboard or paper to search for
leaks. Escaping fluid under pressure
can penetrate the skin causing
serious injury. Relieve pressure
before disconnecting hydraulic lines.
Tighten
all
connections
before
applying pressure. Keep hands and
body away from pinholes and nozzles
which
eject
fluids
under
high
pressure. If any fluid is injected into
the skin, it must be surgically
removed within a few hours by a
doctor familiar with this type injury or
gangrene may result.
F-450
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