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 -- 43Procedure for Counterbalance Pressure Test1. 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.3. Remove controller cover to gain access to lift/lowermanifold (Fig. 30).CAUTIONPrevent personal injury and/or damage to equip-ment. Read all WARNINGS, CAUTIONS and Pre-cautions for Hydraulic Testing at the beginningof this section.4. Determine system charge pressure (see TractionCircuit Charge Pressure in this section).5. Connect a 1000 PSI (70 bar) pressure gauge tocounterbalance test port G2 on lift/lower manifold undercontroller cover (Fig. 31).6. After installing pressure gauge, start engine and runat idle speed. Check for hydraulic leakage at pressuregauge location and correct before proceeding with test.7. Move throttle so engine is running at high idle speed(2870 RPM) with no load on the system. Do not engagethe cutting deck.GAUGE READING TO BE 220 PSI (15.2 bar) oversystem charge pressure (e.g. if charge pressure is250 PSI (17.2 bar), counterbalance pressure shouldbe 470 PSI (32.4 bar)).8. Stop the engine and record test results.9. Adjustment of the counterbalance valve can be per-formed as follows:NOTE: Do not remove the counterbalance valve fromthe hydraulic manifold for adjustment.A. Loosen lock nut on counterbalance valve (Fig.31).B. To increase pressure setting, turn the adjust-ment screw on the valve in a clockwise direction. A1/8 turn on the screw will make a measurable changein counterbalance pressure.C. To decrease pressure setting, turn the adjust-ment screw on the valve in a counterclockwise direc-tion. A 1/8 turn on the screw will make a measurablechange in counterbalance pressure.D. Tighten lock nut to secure adjustment. After ad-justment, recheck counterbalance pressure. Re-adjust as needed.10.When testing is completed, disconnect pressuregauge from manifold test port. Install controller cover.1. Controller cover2. Screw (2 used)3. Flat washer (2 used)4. U--nut (2 used)5. Lift/lower manifoldFigure 30FRONTRIGHT231451. Lift/lower manifold2. Test port G23. Counterbalance valve4. Lock nut5. Adjusting screwFigure 3123451HydraulicSystem