February 2017 Service ManualHydraulic PumpsPart No. 1259369GT S-80 • S-85 • S-80X 1155 Carefully pull the drive pump out until thepump coupler separates from the flex plate.6 Remove the drive pump from the machine.Component damage hazard.The pump(s) may becomeunbalanced and fall if notproperly supported.Component damage hazard.The engine must not be startedwith the hydraulic tank shut-offvalves in the closed position orcomponent damage will occur. Ifthe tank valves are closed,remove the key from the keyswitch and tag the machine toinform personnel of thecondition.How to Prime the Pum pHow to Prime the PumpComponent damage hazard. Besure that the hydraulic tankshutoff valves (if equipped) are inthe open position before primingthe pump. The engine must notbe started with the hydraulic tankshutoff valves in the closedposition or component damagewill occur.1 Connect a 0 to 600 psi / 0 to 40 bar pressuregauge to the diagnostic nipple on the drivepump.2 Continental models: If equipped, close thevalve on the LPG tank, then disconnect thehose from the tank. Move the fuel select toggleswitch to the LPG position.Deutz and Perkins models: Disconnect theengine wiring harness from the fuel solenoid atthe injector pump.3 Crank the engine with the starter motor for 15seconds, wait 15 seconds, then crank theengine an additional 15 seconds or until thepressure reaches 300 psi / 20.7 bar.4 Continental models: If equipped, connect theLPG hose to the LPG tank and open the valveon the tank.Deutz and Perkins models: Connect theengine wiring harness to the fuel solenoid.5 Start the engine from the ground controls andcheck for hydraulic leaks.
