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 Schematics
- Hydraulic Flow Diagrams
- Special Tools
- Troubleshooting
- Testing
- Traction System Operation Testing
- Charge Relief Valve Pressure Test (Using Pressure Gauge)
- Transmission Piston Pump Flow Test (Using Tester with Pressure Gauges and Flow Meter)
- Traction Relief Valve Pressure Test (Using Tester with Pressure Gauges and Flow Meter)
- Wheel Motor Efficiency Test (Using Tester with Pressure Gauges and Flow Meter)
- PTO Pressure Valve Test (Using Pressure Gauge)
- Implement Relief Pressure Test (Using Pressure Gauge)
- Gear Pump Flow Test (Using Tester with Pressure Gauges and Flow Meter)
- Lift Cylinder Internal Leakage Test
- Service and Repairs
- General Precautions for Removing and Installing Hydraulic System Components
- Flush Hydraulic System
- Charge Hydraulic System
- Hydraulic Tank
- Wheel Motors
- Wheel Motor Service
- Transmission
- Transmission Service
- Gear Pump
- Gear Pump Service
- Manual Lift Control Valve (SN Below 313000000)
- Manual Lift Control Valve Service (SN Below 313000000)
- Lift Control Manifold (SN Above 313000000)
- Lift Control Manifold Service (SN Above 313000000)
- Polar TracTM Hydraulic Control Valve
- Polar TracTM Hydraulic Control Valve Service
- Lift Cylinder
- Lift Cylinder Service
- Polar TracTM Lift Cylinder
- Polar TracTM Lift Cylinder Service
- Oil Cooler
- 5 - Electrical System
- Electrical Schematics and Diagrams
- Special Tools
- Troubleshooting
- Electrical System Quick Checks
- Component Testing
- Ignition Switch
- Indicator Lights
- Hour Meter
- PTO Switch
- Neutral Switches
- Seat Switch
- Parking Brake Switch (SN Below 310000000)
- Parking Brake Switch (SN Above 310000000)
- Standard Control Module
- Standard Control Module Logic Chart
- PTO Solenoid Valve Coil
- Lift Control Manifold Solenoid Valve Coils (SN Above 313000000)
- Fusible Link Harness
- Diode Assembly
- Glow Relay
- High Temperature Warning Switch
- High Temperature Shutdown Switch
- Dual Temperature Switch (Polar TracTM Machines)
- Deck Lift/Lower Switch (SN Above 313000000)
- Fuel Pump
- Fuel Stop Solenoid
- Glow Controller
- Service and Repairs
- 6 - Chassis
- 7 - Cutting Deck
- 8 - Foldout Diagrams
- Electrical Drawing Designations
- Hydraulic Schematics
- Hydraulic Schematic (SN Below 313000000)
- Hydraulic Schematic (SN Below 313000000) with Rear Attach Lift Kit
- Hydraulic Schematic (SN Below 313000000) with Polar Trac Installed)
- Hydraulic Schematic (SN Below 313000000) with Polar Trac and Rear Attach Lift Kit
- Hydraulic Schematic (SN From 313000001 to 314999999)
- Hydraulic Schematic (SN Above 315000000)
- Electrical Schematics
- Circuit Diagrams
- Wire Harness
Groundsmaster 7200/7210 Hydraulic SystemPage 4 – 27
The Charge Relief Valve Pressure Test should be per-
formed if a traction circuit problem is identified. This test
will determine if the transmission charge relief valve is
operating correctly.
Procedure for Charge Relief Valve Pressure
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature.
2. Make sure that traction drive is correctly adjusted for
the neutral position.
WARNING
Before disconnecting or performing any work on
the hydraulic system, all pressure in the system
must be relieved. See Relieving Hydraulic System
Pressure in the General Information section.
3. Park machine on a level surface with the cutting deck
(or implement) lowered and off. Apply parking brake.
Make sure engine is off.
4. Read Precautions for Hydraulic Testing listed at the
beginning of this section.
5. Thoroughly clean transmission area surrounding
charge pressure test port on right side of transmission
(Fig. 15).
6. Remove plug from charge pressure test port (Fig.
15). Connect hydraulic pressure gauge (1000 PSI / 70
bar) with an attached hydraulic hose to the transmission
charge pressure port.
7. Make sure that traction levers are in the neutral
locked position and that the parking brake is applied.
8. Start engine and run at low idle speed (1500 to 1650
RPM). Check for any hydraulic leakage from test con-
nections and correct before proceeding with test.
9. With engine running, move throttle to full speed
(3200 RPM).
10.Pressure gauge should read from 70 to 100 PSI (4.8
to 6.9 bar). Record test result.
11. If charge relief pressure specification is not met,
consider the following:
A. The transmission charge relief valve is faulty. Re-
pair or replace the charge relief valve (see Transmis-
sion Service in the Service and Repairs section).
B. A transmission traction relief valve or flushing
valve is leaking or damaged (see Transmission Ser-
vice in the Service and Repairs section).
C. The charge pump in the transmission is faulty
(PTO operation would also be affected. See Trans-
mission Service in the Service and Repairs section).
12.A dynamic charge pressure test can be performed as
follows:
A. With hydraulic pressure gauge still connected, sit
in the operator seat and move the traction levers to
forward.
B. While machine is moving, monitor the charge
pressure reading on the pressure gauge.
C. The charge pressure should drop no more than
15% from initial test reading (Step 10 above) as the
machine is moving (e.g. if initial charge pressure was
100 PSI (6.9 bar), charge pressure while machine is
moving should be above 85 PSI (5.9 bar)).
D. A pressure drop of more than 15% indicates a
traction circuit leak (e.g. a leaking transmission
check valve, a worn/damaged transmission piston
pump). If charge pressure is good under no load, but
drops below specification when under traction load,
the transmission piston pump(s) should be sus-
pected of wear or damage. When a pump is worn or
damaged, the charge pump is not able to keep up
with internal leakage in the traction circuit.
13.Stop machine and shut off engine.
14.Relieve hydraulic system pressure (see Relieving
Hydraulic System Pressure in the General Information
section). Remove pressure gauge from transmission
charge pressure test port. Install plug into port and
torque plug from 13 to 15 ft–lb (17.7 to 21.5 N–m).
Figure 15
Charge Pressure
Test Port
FRONT
Hydraulic
System