New Holland LS140 Workshop Manual page 317

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PARTS INSPECTION

Inspect the control valve components thoroughly for

scratches or nicks, weak centering springs, weak lift

check springs, and scored lift checks or valve seats.

Valve Body, 1

1. Check for cracks in casting that allow an oil leak.

2. Check the lift check seats, 2.

3. Check O ring seating surfaces.

4. Damaged fitting thread areas.

Control Spools, 3

1. Check the spool lands for scratches.

2. Check spool straightness.

IMPORTANT: The spools are matched to the control

valve body. If excessively worn or damaged, replace

the control valve assembly.

NOTE: The three spools are different. Do not mix

spools and return spring assemblies during reas-

Detent Caps, 1

1. Check the detent pins and springs for proper op-

eration. All pins should move freely and return to

position with spring pressure.

2. Clean the caps thoroughly and lubricate the pins

with a light grease.

Lift Checks, 2

1. Check the lift check seat surface for wear or

2. Check the lift check springs.

3. Check the caps to ensure free movement of lift

checks into the caps.

Orifice Plate, 3 (Boom Lower Circuit)

1. Check the flat surface for scratches.

2. Check the hole in the plate for dirt and clean.

Solenoid Spool Locks

1. Check solenoid operation

SECTION 35 - HYDRAULIC SYSTEM

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