SECTION 35 - HYDRAULIC SYSTEM
35-33
3. Install the pressure test gauge in one of the quick
couplers at 2.
4. Start the engine and run it at full throttle (3070 -
3150 RPM).
5. Operate the auxiliary control to pressurize the
auxiliary circuit until the system bypasses and
take a pressure reading. Move the control handle
in the opposite direction to relieve pressure in the
system.
NOTE: Pivoting the control handle down supplies oil
to the male quick coupler.
6. The pressure should be from 177 - 190 bar (260
- 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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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. 238 bar (3500 PSI) gauge (minimum)
2. 3/4″ - 16 UNF O ring fitting
3. Hydraulic hand pump
NOTE: The relief valve is factory set at 241 + 3 bar
(3500 + 50 PSI). The boom circuit relief valve is not
adjustable. All replacement valves are set at 3500
PSI.
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