Toro Groundsmaster 4100-D Service Manual

Also see for 30447: Operator's manual Installation instructions Installation instructions

Contents

Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 65Procedure for Steering and Lift/Lower Gear PumpFlow TestNOTE: Output from the steering and lift/lower gearpump section is equally divided by a proportional valveto provide flow to the steering circuit and the lift circuit.The proportional valve is in the fan drive manifold.NOTE: If steering and lift/lower gear pump section isworn or damaged, charge, steering and lift circuits willall be affected.NOTE: While rotating the steering wheel and raisingthe deck at the same time with the engine running at highidle speed (2870 RPM), an indication of gear pumpdamage may be the steering wheel getting hard to turnand/or the cutting deck raising very slowly.1. Make sure hydraulic oil is at normal operating tem-perature by operating the machine under load forapproximately ten (10) minutes. Make sure the hydrau-lic tank is full.2. Park machine on a level surface with the cutting decklowered and off. Make sure engine is off and the parkingbrake is engaged. Raise and support seat.CAUTIONPrevent personal injury and/or damage to equip-ment. Read all WARNINGS, CAUTIONS and Pre-cautions for Hydraulic Testing at the beginningof this section.3. Thoroughly clean junction of fitting and hydraulichose at the third gear pump section which supplies thesteering and lift/lower circuits (Fig. 47).4. With the engine off and cutting deck lowered, discon-nect the hydraulic hose from the 90 o fitting in the thirdgear pump section.IMPORTANT: Make sure that the oil flow indicatorarrow on the flow gauge is showing that the oil willflow from the pump section, through the tester andinto the hydraulic hose.5. Install tester with pressure gauge and flow meter inseries between the fitting and the disconnected hose.Make sure the flow control valve on the tester is fullyopen.6. After installing tester, start engine and run at idlespeed. Check for hydraulic leakage at tester locationand correct before proceeding with test.IMPORTANT: The gear pump is a positive displace-ment type. If pump flow is completely restricted orstopped, damage to the pump, tester or other com-ponents could occur.7. Move throttle so engine is running at high idle speed(2870 RPM). DO NOT engage the cutting deck.8. While watching pressure gauge on the tester, slowlyclose flow control valve until 1000 PSI (69 bar) is ob-tained on gauge. Verify that engine speed continues tobe 2870 RPM.GAUGE READING TO BE: Flow approximately 7GPM (26 LPM) at 1000 PSI (69 bar).NOTE: If engine speed drops below 2870 RPM, pumpflow will decrease.9. Open the tester flow control valve and stop the en-gine. Record test results.10.If a pressure of 1000 PSI (69 bar) could not be ob-tained or flow is lower than 6 GPM (23 LPM), check forrestriction in pump intake line. If intake line is not re-stricted, consider that the gear pump is worn or dama-ged.11. When testing is complete, remove tester and recon-nect hose to pump fitting.1. Gear pump2. Fan drive manifold3. Steering/lift supply hose4. 90o fittingFigure 471234FRONTRIGHTHydraulicSystem