Case 580SR Service Manual page 153

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SECTION 21 - TRANSMISSION 87
4WD pressure test point.
Pressure should be 12.5 to 15.5 bar at maximum en-
gine speed. (Approximately 2500 rpm).
Converter relief pressure test point.
Pressure should not exceed 7.5 bar at maximum en-
gine speed. (Approximately 2500 rpm).
For Coaxial transmissions max pressure should be
10.5 bar.
Lubrication pressure test point. Pressure should be
0.5 to 2.5 bar at maximum engine speed. (Approxi-
mately 2500 rpm).
If a malfunction of the transmission is indicated a
systematic pressure checking procedure should be
followed. These checks should be carried out while
the transmission is still in the vehicle so that true op-
erating conditions are created. Pressure checks are
essential since a failure in the hydraulic system may
not be easily traceable when the transmission is
stripped down on a bench.
All pressure checks should be carried out with the
transmission gear lever in the neutral position, the oil
temperature at 80 to 85 °C, and the engine speed
maintained at 2000 to 2500 rpm. As a safety precau-
tion the vehicles parking brake should be applied.
All pressure test ports have a 9/16" UNF thread. A
pressure gauge is required that will measure up to
20 bar.
For test port locations refer to illustrations at page
18.