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 -- 25
Mow Circuit
Hydraulic flow for the mow circuit is supplied by the first
two (2) sections of the gear pump. The first gear pump
section P1 supplies hydraulic flow to decks 5, 3 and 2
(also deck 7 on the GM 4700--D), while the second gear
pump section supplies decks 1 and 4 (also deck 6 on the
GM 4700--D).
A single deck control manifold is used to control flow
from the two (2) pump sections. The manifold includes
cartridge valves for control of each of the two (2) pump
circuits. Each manifold circuit is equipped with a sole-
noid controlled, proportional relief valve (PRV1/PRV2),
a logic cartridge (LC1/LC2) and a brake relief cartridge
(RV8/RV09). The Groundsmaster 4700--D deck man-
ifold includes additional cartridges to control hydraulic
flow for decks 6 and 7: an additional logic cartridge
(LC3/LC4), a solenoid valve (SV1/SV2) and an addition-
al brake relief cartridge (RV10/RV11).
PTO Disengaged
When the PTO switch is OFF (or if the decks are r aised),
the deck control manifold solenoid valves (PRV1 and
PRV2) are not energized, allowing hydraulic flow to by-
pass the deck motors through the manifold. Return oil
from the manifolds is routed to the oil cooler and oil filter.
PTO Engaged
When the PTO switch is turned ON with the decks low-
ered, the solenoid valves (PRV1 and PRV2) are ener-
gized with outputs from the TEC--5002 controller. The
energized valves shift to direct pump flow toward the
deck motors. As circuit pressure to the deck motors in-
creases, the brake relief cartridge (RV) opens which al-
lows an oil flow through the manifold orifice positioned
before the logic cartridge (LC). This flow creates a pres-
sure increase at the logic cartridge that will shift the logic
cartridge and allow oil return from the deck motors.
On the Groundsmaster 4700--D (Fig. 19), if deck 6 or
deck 7 is lowered and the PTO switch is ON, the deck
control manifold solenoid valve (SV1/SV2) will be ener-
gized by the TEC--5001 controller. This energized sole-
noid valve allows oil flow to the appropriate deck motor
as described above.
Maximum mow circuit pressure is limited at each deck
manifold circuit by the proportional relief valve
(PRV1/PRV2). The deck relief valve pressure is 3500
PSI (241 bar). Mow circuit pressure can be measured at
port G1 or G3 of the deck control manifold.
The brake relief and logic cartridges control the stopping
rate of the blades when the solenoid valves are de--en-
ergized as the PTO switch is turned OFF or if the decks
are raised (see Cutting Deck Blade Braking in this sec-
tion).
Figure 18
CUTTING DECK LOCATIONS
#4 #1 #5
#7#6 #3#2
Figure 19
3500
PSI
3500
PSI
1500
PSI
1500
PSI
1500
PSI
1500
PSI
P1
P2
T1
G1
PRV1
SV1
PRV2
SV2
LC1
LC4
LC3
M1
M2
M3
M4
M5
M6
M7
M8
RV11
RV09
RV10
T2
RV8
G4
G3
G6
G2
G5
LC2
FROM
TO DECKS
FROM
1&4
DECKS
1&4
TO DECKS
2, 3 & 5
TO DECK
6
FROM
DECK 6
FROM
DECKS
2, 3 & 5
TO DECK
7
FROM
DECK 7
GEAR
TO OIL
COOLER
FROM FAN
CONTROL
MANIFOLD
PUMP
FROM
GEAR
PUMP
DECK CONTROL MANIFOLD (GM4700--D)
PTO SWITCH ON AND #7 (RH) DECK RAISED
Hydraulic
System