SECTION 35 - HYDRAULIC SYSTEM
35-34
Test Procedure
1. Lower the boom and attachment to the ground.
2. Stop engine, turn ignition key to the run position
and operate the boom and bucket control pedals
to relieve pressure in the cylinders. Turn off the
key.
3. Remove the step shield, 1, to access the control
valve and circuit relief valve area.
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4. Boom control valve spool in the neutral (cen-
tered) position.
5. Remove the rear boom hydraulic line, 1, and cap
the line. Install the hydraulic hand pump and
pressure gauge to the rear port in the control
valve.
6. Using the hand pump, build pressure against the
circuit relief valve and monitor the pressure
gauge to read the pressure at the point the relief
valve starts to open.
CAUTION
Do not increase pressure over 3800 psi. If the
relief valve does not open when pressure
reaches 3600 psi, discontinue the test and
replace the valve.
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7. If there is an operational complaint and the boom
circuit relief valve releases pressure under 235
bar (3400 PSI), replace the valve, 1. If the valve
does not release pressure by 248 bar (3600 PSI),
also replace the valve. All replacement boom cir-
cuit relief valves are set at 241 bar (3500 PSI)
and are not adjustable.
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