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18. LEAK DOWN INSPECTION
IMPORTANT NOTE: Following leakage test should only be done by a qualified mechanic.
18.1. FRONT END LOADER FIELD LEAK DOWN INSPECTION AND TEST
CAUTION: Do not stand, walk, or work under a raised loader tilt or attachment unless it is
securely blocked and held in position.
CAUTION: Escaping hydraulic fluid under pressure can have sufficient force to penetrate the skin,
causing serious personal injury. Do not use HANDS to search for suspected leaks. If injured by
escaping fluid, obtain medical treatment immediately.
CAUTION: Visually check for hydraulic leaks and broken, missing, or malfunctioning parts. Never
use your hand to check for suspected leaks under pressure. Use a piece of cardboard or wood for
this purpose. Escaping hydraulic fluid or diesel fuel leaking under pressure can have sufficient
force to penetrate the skin and cause serious infection or other personal injury. If injured by
leaking fluid, seek medical attention immediately.
CAUTION: To prevent personal injury, relieve all pressure before disconnecting fluid lines.
CAUTION: Before applying hydraulic pressure, make sure all hydraulic connections are tight and
components are in good condition.
CAUTION: Be sure to purge all the air from the hydraulic system before attempting to raise or
lower this machine.
18.1.1. Make sure all fittings are tight and not leaking.
Make sure that there is no external leakage from the
valve, fittings or cylinders. If leakage exist repair before
doing any of the following test.
18.1.2. Make sure that there is adequate hydraulic fluid
in the reservoir.
18.1.3. Install pressure gauge in the circuit you are
testing. If testing Lift cylinder leak down install pressure
gauge in base and rod end circuit of lift cylinder
between the loader valve and the lift cylinder. If testing
the tilt cylinder leak down install pressure gauge in rod
end circuit of the tilt cylinder between the loader valve
and the cylinder.
18.1.4. Photo shows typical pressure gauge setup.
Connect 5000 psi min. pressure gauge between loader
valve and cylinder circuit you are checking.
18.1.5. Either quick couple or solid mount the pressure
gauge in the circuit you are testing. Make sure there
are no hydraulic line leaks in system before testing your
loader
18.1.6. Cycle or operate the hydraulic system till the
control valve is warm to the touch.
35 Series 4WD, Model - 3535 & 4035 Loader June’08
