Boom Circuit Relief Valve Test - New Holland LS140 Workshop Manual

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BOOM CIRCUIT RELIEF VALVE TEST

The boom circuit is equipped with a circuit relief

valve, 1, located in the boom control valve. This valve

will protect the cylinders and lines when the control

valve spool is in the neutral (centered) position.

Fittings and gauge required:

1. 340 bar (5000 PSI) gauge (minimum)

2. 3/4" - 16 UNF O ring fitting

3. Hydraulic hand pump

NOTE: The relief valve is factory set at either:

186 + 3 bar (2700 + 50 PSI) - early models

241 + 3 bar (3500 + 50 PSI) - later models

Both of these boom circuit relief valves are not adjust-

able. All replacement valves are set at 3500 PSI.

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 the key

to the "OFF" position.

3. Raise the operator's seat to the raised and

latched position, 1. Be sure that the seat support

rod is latched securely at 2, before working under

a raised seat.

Do not work under raised seat unless securely

latched in the raised position.

4. Remove the step shield, 3, to access the control

valve and circuit relief valve area.

SECTION 35 - HYDRAULIC SYSTEM

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