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 -- 37
4. Raise and support operator seat to allow access to
hydraulic pump assembly.
5. Thoroughly clean ends of hydraulic tubes that con-
nect to the oil filter (Fig. 37). Disconnect hydraulic tubes
from oil filter adapter. Remove two (2) flange head
screwsthatsecureoil filter adapter toframe and remove
oil filter and adapter assembly from machine.
6. Install tee fitting with 1000 PSI (70 bar) pressure
gauge in place of the removed hydraulic filter assembly.
7. Make sure that traction pedal is in neutral, the steer-
ing wheel is stationary and parking brake is engaged.
8. Startengine and run at idle speed. Check for any hy-
draulic leakage from test connections and correct be-
fore proceeding with test.
9. Place throttle to full speed (3200 RPM) and monitor
pressure gauge on tester.
GAUGEREADINGTOBEapproximately 200 to
250 PSI (13.8 to 17.2 bar)
10.Next, determine charge pressure under traction load
byoperatingthemachineinadirect forward and reverse
direction (not steering). Make sure that engine is run-
ning at full speed (3200 RPM). Apply the brakes and
pressthetractionpedal in theforwarddirection and then
to reverse while monitoring the pressure gauge. Stop
engine and record test results.
GAUGEREADINGTOBEapproximately 150 to
250 PSI (13.8 to 17.2 bar)
11.Compare measured charge pressure from step 9
with pressure from step 10:
A. If charge pressure is good under no load (step 9),
but drops below specification w hen under traction
load (step 10), the piston pump should be suspected
of wear and inefficiency. When the pump is worn or
damaged, the charge system is not able to replenish
losttractioncircuitoil due toexcessiveleakage inthe
worn pump.
B. If there is no charge pressure, or pressure is low,
check for restriction in gear pump intake line. Inspect
charge relief valve and valve seat in the traction
pump(see TractionPumpServicein the Serviceand
Repairs section of this chapter). Also, consider a
worn or damaged gear pump (P3) (see Gear Pump
(P3) Flow Test in this section).
NOTE: If gear pump (P3) is worn or damaged, both
charge circuit and steering circuit will be affected.
12.After charge pressure testing is completed, make
sure that engine is not running and then relieve hydrau-
lic system pressure (See Relieving Hydraulic System
Pressure in the General Information section of this
chapter). Remove pressure gauge and tee fitting from
hydraulic tubes. Install oil filter to machine.
13.Lower and secure operator seat.
1. Hydraulic tube
2. Oil filter / filter adapter
3. Hydraulic tube
Figure 37
1
3
2
1. Traction pump
2. Plug
3. O--ring
4. Shim kit
5. Spring
6. Charge relief poppet
Figure 38
2
3
1
FRONT
RIGHT
4
5
6
Hydraulic
System