SECTION 35 - HYDRAULIC SYSTEM
35-31
3. Install the pressure test gauge in the boom cylin-
der at 1.
4. Start the engine and run it at full throttle
(3070 - 3150 RPM) to bring the hydraulic oil to
operating temperature.
5. Operate the boom control to raise the boom to
the fully raised position until the system by-
passes and take a pressure reading. Lower the
boom down to the boom lockpins and relieve
pressure in the system.
6. The pressure should be from 177 - 190 bar (2600
- 2800 PSI) when the hydraulic oil is at operating
temperature.
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7. The relief valve is a cartridge type and is not ad-
justable. Replace the relief valve cartridge, 1, if
the pressure is not within specifications.
CAUTION
Do not attempt to change the pressure setting or
alter the pressure to a higher setting as the
hydraulic components, hoses, tubes, and
cylinders may be damaged and could cause
injury.
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CHECKING MAIN SYSTEM PRESSURE AT
BUCKET CYLINDERS, 1
Fittings and gauge required:
1. 238 bar (3500 PSI) gauge (minimum)
2. 3/4″ - 16 UNF O ring fitting
Test Procedure
1. Lower the boom and attachment to the ground.
2. Stop the engine, turn the ignition key to the run
position and operate the boom and bucket con-
trol pedals to relieve pressure in the cylinders.
Turn off the key.
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