New Holland LS140 Workshop Manual page 302

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5. Boom control valve spool in the neutral (cen-

tered) position.

6. 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

7. 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.

Do not increase pressure over 3800 PSI. If the re-

lief valve does not open when pressure reaches

3600 PSI, discontinue the test and replace the

8. 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.

SECTION 35 - HYDRAULIC SYSTEM

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