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 – 29
The Transmission Piston Pump Flow Test should be
performed if a traction circuit problem is identified. This
test will determine if hydraulic flow from a transmission
piston pump is correct.
Procedure for Transmission Piston Pump Flow
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature. Also, 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.
2. Park machine on a level surface with the cutting deck
(or implement) lowered and off. Make sure engine is off.
3. Read Precautions for Hydraulic Testing listed at the
beginning of this section.
WARNING
Before jacking up the machine, review and follow
Jacking Instructions in Chapter 1 – Safety.
4. Raise and support machine with jack stands so that
both rear wheels are off the ground. In this test, the rear
wheels need to spin freely to allow hydraulic flow
through the traction circuit. Make sure that the parking
brake is not applied.
5. Thoroughly clean transmission area surrounding
traction circuit hoses on top of transmission (Fig. 16).
Determine which piston pump is to be tested.
6. Disconnect hydraulic hose from transmission pump
outlet fitting for piston pump to be tested (Fig. 16):
Piston Pump to be Tested
Pump Outlet
Right Side Pump Port A
Left Side Pump Port C
7. Install hydraulic tester (pressure and flow) in series
between the pump outlet fitting and the disconnected
hose. Make sure that the tester flow arrow points from
the pump outlet and toward the hose. Make sure the
flow control valve on the tester is fully open.
8. Sit in the operator seat, start engine and run at low
idle speed (1500 to 1650 RPM). Check for any hydraulic
leakage from test connections and correct before pro-
ceeding with test.
IMPORTANT: Do not run engine at full speed when
performing this flow test using Toro Hydraulic Tes-
ter (Pressure and Flow) (TOR214678). Traction
pump output at full engine speed can damage hy-
draulic tester.
9. Using a phototac to measure engine speed, move
throttle so engine speed is 2800 RPM (not full speed).
10.Have operator slowly push traction lever for pump
being tested to fully forward position. Leave other trac-
tion lever in neutral position.
11. Slowly close tester flow control valve until pressure
gauge reads 1000 PSI (69 bar). Verify with a phototac
that the engine speed is still 2800 RPM.
12.Observe flow gauge. TESTER READING should be
approximately 13.3 GPM (50.3 LPM) for a traction pump
in good condition.
13.Open tester flow control valve, release traction lever
to the neutral position and stop engine. Record test re-
sults.
14.Normal traction pump flow is 13.3 GPM (50.3 LPM).
Lower pump flow would result in reduced traction circuit
performance. If flow is less than 11 GPM (41.6 LPM) or
a pressure of 1000 PSI (69 bar) cannot be obtained:
A. The traction control lever may need adjustment.
B. If the engine speed drops excessively as the test-
er flow control valve is closed, engine performance
should be evaluated (see Chapter 3 – Kubota Diesel
Engine).
C. If engine speed does not drop and pressure and
flow specifications are not met, the tested transmis-
sion piston pump needs to be inspected, repaired or
replaced as necessary.
15.If transmission piston pump flow specification is met,
and a traction circuit problem has been identified, con-
sider that a wheel motor is worn or damaged (see Wheel
Motor Efficiency Test in this section).
16.Relieve hydraulic system pressure (see Relieving
Hydraulic System Pressure in the General Information
section). Disconnect tester from transmission fitting and
hose. Reconnect hydraulic hose to transmission port fit-
ting.
17.If necessary, repeat flow test for other transmission
piston pump.
Hydraulic
System