NOTE: Test port “D” is located on the swing valve which is mounted inside the
super structure just to the left of the swing reduction unit.
3. Set the swing brake and begin to attempt to swing the machine against the swing
brake. You should exercise caution in doing this until you know that the swing brake is
in good working order and will hold against the swing pressure.
Once you have verified that the swing brake is holding the engine RPM should be brought
up to full governed speed slowly. The swing pressure should be 2500 PSI ± 50 PSI. If
necessary adjust the relief.
NOTE: If the swing pressure is low be certain to use cation when adjusting, if the
swing brake is not in proper working order the increase in pressure may allow the
machine to swing through the brake.
SWING RELIEF VALVE ADJUSTMENT
Adjust this relief using the following procedure:
Remove the acorn nut and loosen the jam nut on the relief valve. Adjust the relief valve with
the adjusting screw while attempting to swing against the swing brake at full engine RPM.
Screw in the adjustment to increase the pressure and out to decrease it. When the
pressure is at 2500 PSI ± 50 PSI tighten the jam nut.
Recheck the pressure after tightening the jam nut as the pressure may change due to
tightening the jam nut.
RT500
Service / Parts
246 REVISED:
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