New Holland LS140 Workshop Manual page 304

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5. Turn the resistance valve, 1, on tester to "O"

6. Start the engine and adjust the throttle to 2900

RPM for the LS140 and 3200 RPM for the LS150.

7. Operate the auxiliary control handle by pivoting

down to pressurize the male quick coupler and

inlet hose to tester.

8. Take a free flow and pressure reading and record

it. The flow at this time is oil flow through the hy-

draulic system and the pressure reading at this

point is force required to pump the oil through the

system. The pressure is called back pressure.

9. Turn the resistance valve, 1, on the tester to ap-

ply resistance in the hydraulic system to obtain

the following specifications:

2900 RPM (engine)

68 bar (1000 PSI) - 40.1 LPM (10.6 GPM)

3200 RPM (engine)

68 bar (1000 PSI) - 44.3 LPM (11.7 GPM)

If the gear pump flow in step 9 is not within 80% of the

pump flow in step 8, remove and repair or replace the

10 GPM free flow Step 8.

7.5 GPM flow Step 9.

80% of 10 GPM = 8 GPM

The pump is not within 80% of free flow. Repair or re-

NOTE: The oil must be at operating temperature

before any hydraulic testing.

If the pressure cannot be obtained, replace the main

system relief valve.

SECTION 35 - HYDRAULIC SYSTEM

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