1. T300-1 & T500-1 Outrigger Relief Valve
2.
Test Port
3.
Bottom This Relief Valve
T300-1 & T500-1 DIVERTER VALVE ADJUSTMENT
The diverter valve regulates the flow of hydraulic oil to the outrigger control and should
maintain a pressure setting at 2500 psi. Check the diverter valve relief pressure using the
following procedure:
1. Operate the boom over relief to warm the oil if necessary.
2. Attach a calibrated pressure gauge in the test port (2).
NOTE: The test port (2) is located on the outrigger diverter valve which is
mounted on the inside of the left frame rail just ahead of the swing bearing.
3. Stall an outrigger function over relief by retracting either a beam or jack and continuing
to hold the function at full engine RPM. The relief setting should be 2500 psi ±50 psi. If
necessary, adjust the relief valve (1).
T300-1 & T500-1 OUTRIGGER RELIEF VALVE ADJUSTMENT
Adjust this relief using the following procedure:
NOTE: There are two relief valves shown in the illustration. The relief valve in the
lower valve section (3) is not used and should be deactivated by turning it in until it
bottoms out. This should be checked prior to setting the outrigger relief valve.
Loosen the jam nut on the relief valve. Adjust the relief with the adjusting screw while fully
retracting and continuing to hold an outrigger jack or beam with the engine at full RPM.
Screw in the adjustment to increase the pressure and out to decrease it. Set the pressure
at 2500 psi ± 50 psi.
Recheck the pressure setting after tightening the jam nut as the pressure may change due
to tighten the nut.
T300-1_T500-1_T780
Service / Parts
446 P/N 12261-683
REVISED: January 2015
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