Section 4 • Repair ProceduresNovember 2014Part No. 229753 GS-2669 RT • GS-3369 RT • GS-4069 RT 4 - 25How to Install the Flex Plate1 Install the flex plate onto the flywheel with theraised spline toward the pump.Note: Install the coupler onto the pump shaft withthe set screw towards the pump. Leave a1 /32 inch / 0.8 mm gap between the coupler andpump end plate. Apply Loctite® removable threadlocker to the coupler set screw and torque the setscrew to 36-40 ft-lbs / 49-54 Nm.2 Apply Loctite ® removable thread locker to theflex plate mounting fasteners. Torque the flexplate mounting fasteners to 40 ft-lbs / 54 Nm.Component damage hazard. Donot force the drive pump duringinstallation or the flex plate splinesmay become damaged.4-5Coolant Temperature and OilPressure SwitchesThe engine coolant temperature switch is anormally open switch. The switch contacts close atapproximately 225°F / 107 °C. If the coolanttemperature rises above the switch point, theswitch contacts close and the engine will shut off toprevent damage. The engine will not start until thetemperature drops below the switch point. An over-temperature indicator light at the ground controlsshould turn on when the switch closes.The engine oil pressure switch is a normally closedswitch. The switch contacts open at approximately7 psi / 0.48 bar. If the oil pressure drops below theswitch point, the contacts open and the engine willshut off to prevent damage. A low oil pressureindicator light at the ground controls should turn onwhen the switch opens.How to Replace the CoolantTemperature and Oil PressureSwitches1 Open the engine side cover and pull up on thelock pin on the engine pivot tray located underthe radiator. Swing the engine pivot tray out andaway from the machine to access bothswitches.a b c d efKUBOTA D1105 ENGINEa pumpb pump shaftc pump couplerd flex platee flywheelf 1 /8 inch / 3.175 mm gap
