Service Manual
Table Of Contents
- Title Page
- Revision History
- Reader Comments
- Preface
- Table Of Contents
- 1 - Safety
- 2 - Product Records and Maintenance
- 3 - Yanmar Diesel Engine
- 4 - Hydraulic System
- Table of Contents
- Specifications
- General Information
- Hydraulic Schematics
- Hydraulic Flow Diagrams
- Special Tools
- Troubleshooting
- Testing
- Traction Circuit Charge Pressure
- Traction Circuit Relief Pressure
- Reverse Traction Circuit Reducing Valve (PR) Pressure
- Rear Traction Circuit Relief (RV) Pressure
- Piston (Traction) Pump Flow
- Cutting Deck Circuit Pressure
- Cutting Deck Circuit Relief Pressure
- Deck Motor Case Drain Leakage
- Steering Circuit Relief Pressure
- Steering Cylinder Internal Leakage
- Lift/Lower Circuit Relief Pressure
- Engine Cooling Fan Circuit
- Gear Pump Flow
- Adjustments
- Service and Repairs
- General Precautions for Removing and Installing Hydraulic System Components
- Check Hydraulic Lines and Hoses
- Priming Hydraulic Pumps
- Flush Hydraulic System
- Filtering Closed-Loop Traction Circuit
- Charge Hydraulic System
- Gear Pump
- Gear Pump Service
- Piston (Traction) Pump
- Piston (Traction) Pump Service
- Rear Traction Control Manifold
- Rear Traction Control Manifold Service
- Control Manifold Cartridge Valve Service
- HI/LOW Range Control Manifold
- Rear Axle Motor
- Front Wheel Motors
- Rear Axle and Front Wheel Motor Service
- Cutting Deck Motor
- Cutting Deck Motor Service
- Deck Control Manifold
- Deck Control Manifold Service (GM 4500-D)
- Deck Control Manifold Service (GM 4700-D)
- Steering Control Valve
- Steering Control Valve Service
- Steering Cylinder
- Steering Cylinder Service
- Engine Cooling Fan Motor
- Engine Cooling Fan Motor Service
- Fan Control Manifold
- Fan Control Manifold Service
- Lift Control Manifold
- Lift Control Manifold Service (GM 4500-D)
- Lift Control Manifold Service (GM 4700-D)
- Lift Circuit Junction Manifold
- Lift Cylinders: Decks #1, #4 and #5
- Lift Cylinders: Decks #2 and #3
- Lift Cylinders: Decks #6 and #7 (GM 4700-D)
- Lift Cylinder Service
- Hydraulic Reservoir
- Radiator and Oil Cooler Assembly
- 5 - Electrical System
- Table of Contents
- General Information
- Special Tools
- InfoCenter Display
- Troubleshooting
- Electrical System Quick Checks
- Adjustments
- Component Testing
- Ignition Switch
- Fuses
- Fusible Link Harness
- PTO Switch
- Hi/Low Speed, Engine Speed Request and Cutting Deck Lift Switches
- Headlight Switch
- Seat Switch
- Parking Brake Switch
- Cutting Deck Position Switches
- Relays with Four (4) Terminals
- Relays with Five (5) Terminals
- Traction Pedal Position Sensor
- Toro Electronic Controllers (TEC)
- Hydraulic Solenoid Valve Coils
- Piston (Traction) Pump Control Solenoid Coils
- Hydraulic Oil Temperature Sender
- Fuel Pump (Models 30873 and 30874)
- Fuel Pump (Models 30881 and 30882)
- CAN-bus Termination Resistor
- Diode Assemblies
- Resistor Assemblies
- Fan Speed Switch (Machines with Two−Post ROPS Extension Operator Fan Kit)
- Resistor Module (Machines with Two−Post ROPS Extension Operator Fan Kit)
- Service and Repairs
- 6 - Axles, Planetaries and Brakes
- Table of Contents
- Specifications
- General Information
- Adjustments
- Service and Repairs
- Brake Assembly
- Brake Inspection and Repair
- Planetary Drive Assembly
- OPH-2 Series Planetary Drive Service
- VA02 Series Planetary Drive Service
- Rear Axle Assembly
- Rear Axle Service
- Bevel Gear Case and Axle Case
- Differential Shafts
- Axle Shafts
- Input Shaft/Pinion Gear
- Differential Gear
- Pinion Gear to Ring Gear Engagement
- 7 - Chassis
- 8 - Cutting Decks
- 9 - Foldout Drawings
- Electrical Drawing Designations
- Groundsmaster 4500--D Hydraulic Schematic
- Groundsmaster 4500--D With Optional Flow Divider Kit Hydraulic Schematic
- Groundsmaster 4700--D Hydraulic Schematic
- Groundsmaster 4700--D With Optional Flow Divider Kit Hydraulic Schematic
- Electrical Schematic Groundsmaster 4500--D/4700--D Models 30881 and 30882 (Serial numbers below 315000300)
- Electrical Schematic Groundsmaster 4500--D/4700--DModels 30873 and 30874(Serial numbers below 315000300)
- Groundsmaster 4500--D/4700--D Electrical Schematic Models 30881 and 30882 (Serial Numbers 315000301 to 399999999)
- Groundsmaster 4500--D/4700--D Electrical Schematic Models 30873 and 30874 (Serial Numbers 315000301 to 399999999)
- Groundsmaster 4500--D/4700--D Electrical Schematic Models 30881 and 30882(Serial Numbers 400000000 to 403450000)
- Groundsmaster 4500--D/4700--D Electrical Schematic Models 30873 and 30874(Serial Numbers 400000000 to 403450000)
- Groundsmaster 4500--D/4700--D Electrical Schematic (Serial Numbers Serial Numbers 403450001 to 408000000)Models 30881 and 30882
- Groundsmaster 4500--D/4700--DElectrical Schematic(Serial Numbers Above 408000000)
- Groundsmaster 4500--D/4700--D Electrical Schematic (Serial Numbers Above 403450001) Models 30873 and 30874
- Electrical Schematic Groundsmaster 4500--D/4700--D Optional Operator Cab (Serial number below 399999999)
- Groundsmaster 4500--D/4700--D Electrical Schematic Optional Operator Cab (Serial Numbers Above 400000000)
- Groundsmaster 4500--D/4700--D Main Wire Harness (Serial number below 315000300)
- Groundsmaster 4500--D/4700--D Main Wire Harness (Serial Numbers 315000301 to 399999999)
- Groundsmaster 4500--D/4700--D Main Wire Harness (Serial Numbers 400000000 to 403450000)
- Groundsmaster 4500--D/4700--D Main Wire Harness (Serial Numbers Above 403450001)
- Groundsmaster 4500--D/4700--D Seat and Console Wire Harness (Serial number below 399999999)
- Groundsmaster 4500--D/4700--D Seat and Console Wire Harness (Serial Numbers 400000000 to 403450000)
- Groundsmaster 4500--D/4700--D Seat and Console Wire Harness (Serial Numbers Above 403450001)
- Groundsmaster 4500--D/4700--D Power Center Wire Harness(Serial number below 403450000)
- Groundsmaster 4500--D/4700--D Power Center Wire Harness(Serial Numbers Above 403450001)
- Deck 6 and 7 Wire Harness Groundsmaster 4700--D
- (Models 30881 and 30882) Engine Wire Harness Drawing Groundsmaster 4500--D/4700--D (Serial number below 315000000)
- Groundsmaster 4500--D/4700--D (Models 30881 and 30882) Engine Wire Harness Drawing(Serial Numbers 315000001 to 408000000)
- Groundsmaster 4500--D/4700--D(Models 30881 and 30882)Engine Wire Harness Drawing(Serial Numbers Above 408000000)
- Groundsmaster 4500--D/4700--D(Models 30881 and 30882)Engine DPF Sub--Wire Harness Drawing(Serial Numbers Above 408000000)
- (Models 30873 and 30874) Engine Wire Harness Drawing Groundsmaster 4500--D/4700--D
- Groundsmaster 4500--D/4700--D Wire Harness Diagram -- Two--Post ROPS Extension
- Groundsmaster 4500--D/4700--DPower Harness Kit -- Wiring Diagram
Groundsmaster 4500 --D/4700--D Hydraulic SystemPage 4 -- 69
Procedure for Engine Cooling Fan Circuit
Test
The engine cooling fan circuit test should be performed
to make sure that the engine cooling fan circuit has the
correct system pressure and fan speed.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes. Make sure the hydraulic reservoir is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
3. Raise and support hood to gain access to fan control
manifold (Fig. 56). Connect a 5,000 PSI (345 bar) gauge
with hydraulic hose attached to test fitting in port G1 on
rear of manifold.
4. Start the engine and increase engine speed to high
idle speed.
5. While monitoring the pressure gauge and using a
phototac to identify the cooling fan speed, disconnect
the wire harness connector (white/violet and black
wires) from the p roportional relief valve solenoid at fan
control manifold (port TS). Both fan speed and pressure
should increase and stabilize after the solenoid is dis-
connected.
PRESSURE GAUGE READING TO BE approxi-
mately 3000 PSI (207 bar)
PHOTOTAC (fan speed) READING TO BE approxi-
mately 2800 RPM
6. Stop engine and record test results.
7. If pressure rises to approximately 3000 PSI (207
bar) but fan speed is low, consider that the hydraulic fan
motor is worn or damaged. If pressure and fan speed
are both low, consider that final gear pump section is
worn or damaged (see Gear Pump Flow Test in this sec-
tion).
NOTE: If pressure and fan speed are both low and the
final gear pump section flow proves to be correct (see
Gear Pump Flow Test in this section), suspect that seals
in fan control manifold are leaking or faulty (see Fan
Control Manifold Service in the Service and Repairs
section of this chapter) or that fan motor is worn or dam-
aged.
8. When testing is complete, remove pressure gauge
from manifold fitting and reconnect wire harness to pro-
portional relief valve solenoid. Lower and secure hood.
1. Fan control manifold
2. Test fitting (port G1)
3. PRV solenoid
Figure 56
2
1
3
Hydraulic
System