caution - Toro
caution - Toro
caution - Toro
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Chapter 4<br />
Hydraulic System<br />
Table of Contents<br />
SPECIFICATIONS ............................. 2<br />
GENERAL INFORMATION ..................... 3<br />
Operator’s Manual .......................... 3<br />
Towing Traction Unit ......................... 3<br />
Check Hydraulic Fluid ....................... 3<br />
Hydraulic Hoses ............................ 4<br />
Hydraulic Hose and Tube Installation .......... 5<br />
Hydraulic Fitting Installation ................... 6<br />
HYDRAULIC SCHEMATIC ..................... 8<br />
HYDRAULIC FLOW DIAGRAMS ............... 10<br />
Traction Circuit: 4WD (Mow) ................. 10<br />
Traction Circuit: Transport (2WD) ............. 12<br />
Lower Cutting Deck ........................ 14<br />
Raise Cutting Deck ......................... 16<br />
Mow Circuit ............................... 18<br />
Mow Circuit Cutting Deck Blade Braking ....... 20<br />
Steering Circuit ............................ 22<br />
Engine Cooling Fan Circuit .................. 24<br />
SPECIAL TOOLS ............................ 26<br />
TROUBLESHOOTING ........................ 28<br />
TESTING ................................... 31<br />
Traction Circuit Charge Pressure ............. 32<br />
Traction Circuit Relief Pressure .............. 34<br />
Counterbalance Pressure ................... 36<br />
Rear Traction Circuit (RV) Relief Pressure ..... 38<br />
Traction Circuit Reducing Valve (PR)<br />
Pressure ................................ 40<br />
Cutting Deck Circuit Pressure ................ 42<br />
PTO Relief Pressure ........................ 44<br />
Cutting Deck Gear Pump Flow ............... 46<br />
Cutting Deck Motor Case Drain Leakage ...... 48<br />
Steering Circuit Relief Pressure .............. 50<br />
Lift/Lower Circuit Relief Pressure ............. 52<br />
Steering and Lift/Lower Gear Pump Flow ...... 54<br />
Engine Cooling Fan Circuit .................. 56<br />
Engine Cooling Fan Circuit Gear Pump Flow ... 58<br />
ADJUSTMENTS ............................. 60<br />
Adjust Cutting Deck Flow Control Valve ....... 60<br />
SERVICE AND REPAIRS ..................... 61<br />
General Pre<strong>caution</strong>s for Removing and<br />
Installing Hydraulic System Components .... 61<br />
Check Hydraulic Lines and Hoses ............ 61<br />
Flush Hydraulic System ..................... 62<br />
Charge Hydraulic System ................... 63<br />
Hydraulic Reservoir ........................ 64<br />
Hydraulic Oil Cooler ........................ 66<br />
Gear Pump ................................ 68<br />
Gear Pump Service ......................... 70<br />
Traction Circuit ............................. 72<br />
Piston (Traction) Pump ...................... 74<br />
Piston (Traction) Pump Service .............. 76<br />
Rear Axle Motor ........................... 78<br />
Front Wheel Motors ........................ 80<br />
Rear Axle and Front Wheel Motor Service ..... 82<br />
4WD Manifold ............................. 84<br />
4WD Manifold Service ...................... 86<br />
Filter Manifold ............................. 88<br />
Filter Manifold Service ...................... 90<br />
Steering and Cooling Fan Circuits ............ 92<br />
Steering Valve ............................. 94<br />
Steering Valve Service ...................... 96<br />
Steering Cylinder ........................... 98<br />
Steering Cylinder Service .................. 100<br />
Engine Cooling Fan Motor .................. 102<br />
Engine Cooling Fan Motor Service ........... 104<br />
Fan Drive Manifold ........................ 108<br />
Fan Drive Manifold Service ................. 110<br />
Mow Circuit .............................. 112<br />
Cutting Deck Motor ........................ 113<br />
Cutting Deck Motor Service ................. 114<br />
Deck Manifolds ........................... 118<br />
Deck Manifold Service ..................... 120<br />
Lift/Lower Circuit .......................... 122<br />
Lift/Lower Control Valve .................... 124<br />
Lift/Lower Control Valve Service ............. 126<br />
Front Deck Lift Cylinder .................... 128<br />
Wing Deck Lift Cylinder .................... 130<br />
Deck Lift Cylinder Service .................. 132<br />
Counterbalance Manifold ................... 134<br />
Counterbalance Manifold Service ............ 136<br />
EATON MODEL 72400 SERVO CONTROLLED PIS-<br />
TON PUMP REPAIR INFORMATION<br />
EATON MODEL 74318 and 74348 PISTON MOTORS:<br />
FIXED DISPLACEMENT, VALVE PLATE DESIGN<br />
REPAIR INFORMATION<br />
Hydraulic<br />
System<br />
Groundsmaster 4100--D<br />
Page 4 - 1<br />
Hydraulic System