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 – 37
The Implement Relief Pressure Test should be per-
formed if a cutting deck (or implement) raise and lower
problem is identified. This test will determine if the imple-
ment relief valve is operating correctly.
Procedure for Implement Relief 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. Make sure engine is off
and the parking brake is engaged.
4. Read Precautions for Hydraulic Testing listed at the
beginning of this section.
5. Thoroughly clean junction of hydraulic hose and low-
er fitting on rear of lift control valve (Fig. 22).
6. Disconnect hydraulic hose from lower fitting on rear
of lift control valve (Fig. 22). This hose is from the gear
pump outlet and provides oil flow to the lift control valve
(Fig. 23).
NOTE: Implement relief pressure can also be tested
with hydraulic tester (pressure and flow). Connect tester
in series with the lift control valve fitting and the discon-
nected hose. Use pressure gauges on hydraulic tester
and follow procedure below.
7. Install T–connector with hydraulic pressure gauge
(5000 PSI / 345 bar) in series with the lift control valve
fitting and the disconnected hose.
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).
IMPORTANT: Hold lift lever in the raise position
only long enough to get a system pressure reading.
Holding the lift lever in the raise position for an ex-
tended period may damage the lift control valve.
10.Watch pressure gauge carefully while moving lift le-
ver to the raise position and holding.
11. System pressure should be approximately 3000 PSI
(207 bar) as the implement relief valve lifts. Return lift
lever to the neutral position.
12.Stop engine. Record test results.
13.If specification is not met, repair or replace imple-
ment relief valve in gear pump (see Gear Pump Service
in the Service and Repairs section of this chapter). Also
consider a leaking lift cylinder, a damaged lift control
valve or a worn gear pump.
14.Relieve hydraulic system pressure (see Relieving
Hydraulic System Pressure in the General Information
section). Disconnect T–connector with test gauge from
lift control valve fitting and hydraulic hose. Reconnect
hydraulic hose to control valve fitting.
1. Lift control valve 2. Hose from gear pump
Figure 22
1
2
1. Gear pump 2. Hose to lift control valve
Figure 23
FRONT
RIGHT
1
2
Hydraulic
System