February 2017 Service ManualManifoldsPart No. 1259369GT S-80 • S-85 • S-80X 1298-11Valve Adjustments - TractionManifoldHow to Adjust the Hot Oil ShuttleRelief ValveNote: The pressure differential between the chargepump relief valve (located in the drive pump) andthe hot oil shuttle relief valve (located in the tractionmanifold) is necessary to return hot oil from theclosed loop drive circuit to the hydraulic tank forcooling. This pressure differential must bemaintained at 40 psi / 3 bar.Note: The following procedure will require twopeople.1 Open the engine side turntable cover andconnect a 0 to 600 psi / 0 to 40 bar pressuregauge to the diagnostic nipple on the drivepump.2 Start the engine from the platform controls andallow the engine to run at low idle. Note thepressure reading on the pressure gauge.3 Turn the engine off and connect a 0 to 600 psi/ 0 to 40 bar pressure gauge to the diagnosticnipple located on the traction manifold.4 Start the engine from the platform controls anddrive the machine slowly in the forwarddirection. Note the pressure reading on thepressure gauge.5 Turn the engine off, and remove the hot oilshuttle relief valve cap (item BJ). Adjust theinternal hex socket clockwise to increase thepressure or counterclockwise to decrease thepressure. Install the valve cap.6 Repeat steps 4 and 5 until a pressuredifferential (between the charge pump readingand the hot oil shuttle relief valve) of 40 psi / 3bar is obtained.
