Exmark 000 & higher, 920 manual Hydraulic System Air Purge, Wheel Hub Nut Torque Specification

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Maintenance

Note: Do Not change hydraulic system oil (except for what can be drained when changing filter), unless it is felt the oil has been contaminated or been extremely hot.

Changing oil unnecessarily could damage hydraulic system by introducing contaminates into the system.

Hydraulic System Air Purge

Service Interval: As required

Air must be purged from the hydraulic system when any hydraulic components, including oil filter, are removed or any of the hydraulic lines are disconnected.

The critical area for purging air from the hydraulic system is between the oil reservoir and each charge pump located on the top of each variable displacement pump (Figure 21). Air in other parts of the hydraulic system will be purged through normal operation once the charge pump is “primed”.

Figure 21

1. Charge pump cap

2. Loosen 1 1/2 turns only

1.Stop engine and wait for all moving parts to stop. Raise the rear of the machine up onto jack stands high enough to raise the drive wheels off the ground.

2.Check oil level as stated in Check Hydraulic Oil Level section.

3.Start engine and move throttle control ahead to full throttle position. Move RH motion control lever inward (together) and move both levers forward with equal pressure.

If either drive wheel does not rotate, it is possible to assist the purging of the charge pump by carefully rotating the tire in the forward position.

Note: It is necessary to lightly touch the charge pump cap with your hand to check the pump temperature. If the cap is too hot to touch, turn off engine. The pumps may be damaged if the pump becomes too hot.

If either drive wheel still does not rotate continue with step 4.

4.Thoroughly clean the area around each of the charge pump housings.

5.To “prime” charge pump, loosen two hex socket head capscrews (shown in Figure 21) 1 1/2 turns only. Make sure engine is not running. Lift the charge pump housing upward and wait for a steady flow of oil to flow out from under the housing. Retighten the capscrews. Do this for both pumps.

Note: Hydraulic reservoir can be pressurized up to 5 psi to speed this process.

6.If either drive wheel still does not rotate, stop and repeat steps 4 and 5 above for the respective pump. If wheels rotate slowly, the system may prime after additional running. Check oil level as stated in Check the Hydraulic Oil Level section.

7.Allow unit to run several minutes after the charge pumps are “primed” with drive system in the full speed position. Check oil level as stated in Check the Hydraulic Oil Level section.

8.Check hydro drive linkage adjustment as stated in Hydro Drive Linkage Adjustment section in Adjustments.

Wheel Hub Nut Torque Specification

Service Interval: After the first 100 hours

Every 500 hours thereafter

Torque the nut on the wheel motor tapered shaft to 175-225 ft-lb (237-305 N-m).

Note: Do Not use anti-seize compound on the wheel hub.

Check Spark Arrester (if equipped)

Service Interval: Every 50 hours

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Contents Vantage California Introduction Contents Safety Safety Alert SymbolSafe Operating Practices TrainingSafety Operation Slope OperationMaintenance and Storage Safety Safety and Instructional Decals 116-0404 116-3267 116-3290 116-4270 116-4271 116-4298 116-1887 Systems SpecificationsModel Numbers Dimensions Torque RequirementsMotion Control Levers Product Overview OperationControls Ignition Switch Choke ControlThrottle Control Front Reference/Speed Control BarPTO Engagement Switch Low Voltage IndicatorHour Meter Fuel Shut-Off ValvePre-Start Operating InstructionsOpen the Fuel Shut-Off Valve Starting the EngineDisengaging the PTO Stopping the EngineDriving the Machine Driving ForwardAdjusting the Front Reference/Speed Control Bar Driving in ReverseOperating the Platform Operating the Machine with the Platform UpAdjusting the Cutting Height Operating the Machine with the Platform DownLoading a Unit TransportingTransporting a Unit Maintenance Recommended Maintenance SchedulesCheck Battery Charge Recommended Jump Starting ProcedureCheck Engine Oil Level Proposition 65 WarningRelease the Cushion for Rear Access Do Not jump start a weak battery if these conditions existCheck Mower Blades Remove key. Engage parking brakeCheck Safety Interlock System Service Air CleanerChecking the Safety Interlock System Check for Loose HardwareChange Engine Oil Check Hydraulic Oil LevelCheck Tire Pressures Check Condition Of BeltsLubrication Chart Lubricate Caster Wheel HubsCheck Spark Plugs Change Fuel FilterChange Hydraulic System Filter and Fluid LevelCheck Spark Arrester if equipped Wheel Hub Nut Torque SpecificationHydraulic System Air Purge Thread Locking Adhesives Mobil HTS Grease Or Food-Grade Anti-seizeCopper-Based Anti-seize Dielectric GreaseAdjustments Deck LevelingOverall Height Adjustment Park Brake AdjustmentDeck Lift Handle Force Pump Drive Belt TensionElectric Clutch Adjustment Removing the ShimForward Speed Adjustment Motion Control Tracking Adjustment Adjust RH Motion Control Handle Position Caster Pivot Bearings Pre-Load Adjustment Clean Engine and Exhaust System AreaRemove Engine Shrouds and Clean Cooling Fins Clean Debris From MachineClean Grass Build-Up Under Deck Battery DisposalWaste Disposal Motor Oil DisposalTroubleshooting Problem Possible Cause Corrective ActionTroubleshooting Troubleshooting Schematics Electrical DiagramElectrical Schematic Hydraulic Diagram General Warranty Conditions and Products Covered Service Record Date Description of Work Done Service Done ByPage This page may be copied for personal use See EXMARK’S Complete Line of Accessories and Options
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920, 000 & higher specifications

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