Service Manual
Table Of Contents
- Title Page
- Revision History
- Reader Comments
- Preface
- Table of Contents
- 1 - Safety
- 2 - Product Records and Maintenance
- 3 - Kubota Diesel Engine
- 4 - Hydraulic System
- Specifications
- General Information
- Hydraulic Schematic
- Hydraulic Flow Diagrams
- Special Tools
- Troubleshooting
- Testing
- Traction Circuit Relief Valve (R3) and (R4) Pressure Test
- Traction Circuit Charge Pressure Test
- Gear Pump (P3) Flow Test
- Front Wheel Motor Efficiency Test
- Piston (Traction) Pump Flow Test
- Relief Valve (PRV1) and (PRV2) Pressure Test
- Gear Pump (P1) and (P2) Flow Test
- Deck Motor Efficiency Test
- Lift Relief Valve (PRV) Pressure Test
- Gear Pump (P4) Flow Test
- Lift Cylinder Internal Leakage Test
- Steering Relief Valve (R10) Pressure Test
- Steering Cylinder Internal Leakage Test
- Service and Repairs
- General Precautions for Removing and Installing Hydraulic System Components
- Check Hydraulic Lines and Hoses
- Flush Hydraulic System
- Filtering Closed--Loop Traction Circuit
- Hydraulic System Start--up
- Hydraulic Reservoir
- Hydraulic Pump Drive Shaft
- Hydraulic Pump Assembly
- Piston (Traction) Pump Service
- Gear Pump Service
- Front Wheel Motors
- Rear Wheel Motors
- Wheel Motor Service
- CrossTrax AWD Manifold
- CrossTrax AWD Manifold Service
- Deck Control Manifold
- Deck Control Manifold Service
- Cutting Deck Motor
- Cutting Deck Motor Service
- Lift Control Manifold
- Lift Control Manifold Service
- Lift Cylinder
- Lift Cylinder Service
- Steering Control Valve
- Steering Control Valve Service
- Steering Cylinder
- Steering Cylinder Service
- Oil Cooler
- 5 - Electrical System
- General Information
- Special Tools
- Troubleshooting
- Electrical System Quick Checks
- Adjustments
- Component Testing
- Ignition Switch
- Indicator Lights
- Hour Meter
- Temperature Gauge
- PTO Switch
- Headlight Switch
- Seat Switch
- Joystick Raise and Lower Switches
- Traction Neutral Switch
- Parking Brake Switch
- Mow/Transport Switch
- Start Relay
- Main Power and Glow Relays
- Toro Electronic Controller (TEC)
- Fuses
- Diode Assembly
- Fusible Link Harness
- Hydraulic Solenoid Valve Coil
- Temperature Sender
- High Temperature Shutdown Switch
- Oil Pressure Switch
- Fuel Stop Solenoid
- Fuel Pump
- Service and Repairs
- 6 - Chassis
- 7 - Cutting Decks
- 8 - Foldout Drawings
- Hydraulic Schematic
- Electrical Schematic Sheet 1 of 2 (Serial numbers below 315000000)
- Electrical Schematic Sheet 2 of 2 (Serial numbers below 315000000)
- Eclectrical Schematic (Serial numbers 315000001 to 403430000)
- Eclectrical Schematic (Serial numbers above 403430001)
- Main Wire Harness Drawing (Serial numbers below 315000000)
- Main Wire Harness Diagram (Serial numbers below 315000000)
- Main Wiring Harness Drawing (Serial numbers 315000001 to 403430000)
- Main Wiring Harness Diagram (Serial numbers 315000001 to 403430000)
- Main Wiring Harness Drawing (Serial numbers 403430001 to 405699999)
- Main Wiring Harness Diagram (Serial numbers 403430001 to 405699999)
- Main Wiring Harness Drawing (Serial numbers above 405700000)
- Main Wiring Harness Diagram (Serial numbers above 405700000)
- Seat Wire Harness Drawing
- Seat Wire Harness Diagram
- Engine Wire Harness Drawing
- Engine Wire Harness Diagram
Groundsmaster 4300--D Hydraulic SystemPage 4 -- 39
CAUTION
Before opening hydraulic system, operate all hy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
Relieving Hydraulic System Pressure in the Gen-
eral Information section of this chapter.
4. Raise and support operator seat to allow access to
hydraulic pump.
5. Thoroughly clean the ends of the hydraulic tubes
connected to the oil filter and traction pump inlets (Fig.
40). D isconnect hydraulic tubes from oil filter inlet and
traction pump inlet. Remove two (2) flange head screws
that secure oil filter adapter to frame. Remove oil filter
assembly and hydraulic tube from machine.
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow meter is showing that the oil will
flow from the hydraulic tube, t hrough the tester and
into the traction pump.
6. Install tester w ith pressure gauges and flow meter in
place of the removed oil filter assembly and hydraulic
tube. Connect tester inlet hose to the hydraulic tube.
Connect the tester outlet hose to the traction pump fit-
ting.Make sure the flow control valve on tester is ful-
ly open.
7. Make sure that the traction pedal is in neutral, the
steering wheel is stationary and the parking brake is en-
gaged.
8. Startengine and run at idle speed. Check for any hy-
draulic leakage from test connections and correct be-
fore proceeding with test.
9. Move throttle to full speed (3200 RPM).Usea
tachometer to verify that engine speed is correct.
IMPORTANT: The gear pump is a positive displace-
ment type. If pump flow is completely restricted or
stopped, damage to the pump, tester or other com-
ponents could occur.
10.While watching pressure gauges, slowly close the
tester flow control valve until 800 PSI (55 bar) is ob-
tained on gauge.
FLOW TESTER READING TO BE: A pump in good
condition should have a flow of approximately 4.9
GPM (18.5 LPM) at 800 PSI (55 bar).
11.Open the tester flow control valve, stop engine and
record test results.
12.If flow is less than 4.4 GPM (16.6 LPM) or a pressure
of 800 PSI (55 bar) cannot be obtained, consider that a
pump problem exists. Check for restriction in pump in-
take line. If intake is not restricted, remove gear pump
and repair or replace pump as necessary (see Gear
Pump in the Service and Repairs section of this chap-
ter).
NOTE: Iftheflow fromgearpump(P3)islow, theopera-
tion of both the charge circuit and the steering c ircuit will
be affected.
13.After testing is completed, make sure that engine is
stopped, then relieve hydraulic system pressure (see
Relieving Hydraulic System Pressure in the General In-
formation section of this chapter). Remove tester and
then install oil filter assembly and hydraulic tube to ma-
chine.
14.Lower and secure operator seat.
1. Hydraulic tube
2. Oil filter / filter adapter
3. Hydraulic tube
4. Gear Pump (P3)
Figure 40
3
2
4
1
Hydraulic
System