New Holland LS140 Workshop Manual page 313

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Op. 35 724 54

DISASSEMBLY AND INSPECTION

Main System Relief Valve

The non-serviceable, non-adjustable, cartridge- type

main system relief valve, 1, is set at 170 - 177 bar

(2500 - 2600 PSI). The relief valve should not be re-

placed with a valve of a higher pressure setting, as

structural damage to the boom and/or main frame or

internal damage to hydraulic system may occur.

Component failure from high hydraulic pressure

could result in injury.

Lift Check Valves

There is a check valve in each circuit - bucket, boom,

and auxiliary.

The only time the check valves serve a function is af-

ter the control spools have been shifted. If the valves

are operating properly, they prevent any movement

of either the boom or bucket until pressure opens the

lift checks.

Inspect the lift check components for damage to the

seat, 1, spring, 2, or cap, 3.

Op. 35 724 90

Spool Locks (Boom and Bucket)

Remove the solenoid plunger assemblies, 1, from

the ports, 2, over the control spool ends.

SECTION 35 - HYDRAULIC SYSTEM

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