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 – 39
The Gear Pump Flow Test should be performed if a cut-
ting deck (or implement) raise and lower problem is
identified. This test will determine if hydraulic flow from
the gear pump is correct.
Procedure for Gear Pump Flow
Test:
NOTE: Over a period of time, the gears and wear plates
in the gear pump can wear. A worn pump will by–pass
oil and make the pump less efficient. Eventually, enough
oil loss will occur to cause the cutting unit motors to stall
under heavy cutting conditions. Continued operation
with a worn, inefficient pump can generate excessive
heat and cause damage to seals and other components
in the hydraulic system.
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
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.
6. Disconnect hydraulic hose from lower fitting on rear
of lift control valve (Fig. 25). This hose is from the gear
pump outlet and provides oil flow to the lift control valve.
7. Install hydraulic tester (pressure and flow) in series
with the gear pump fitting and the disconnected hose.
Make sure that tester flow arrow points from the pump
outlet port and toward the disconnected hose. Make
sure the flow control valve on the tester is fully
open.
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.Watch tester pressure gauge carefully while slowly
closing the flow control valve until 1000 PSI (69 bar) is
obtained. Do not close tester load valve fully. Verify with
a phototac that the engine speed remains 3200 RPM
while maintaining 1000 PSI (69 bar) on the tester pres-
sure gauge.
11. Observe flow gauge. Flow indication for a pump in
good condition is 5.4 GPM (20.4 LPM).
12.Open tester load valve and then stop engine. Record
test results.
13.Normal pump flow is 5.4 GPM (20.4 LPM). Lower
pump flow would result in reduced circuit performance.
If flow was less than 4.8 GPM (18.2 LPM) or a pressure
of 1000 PSI (69 bar) cannot be obtained, check for re-
striction in the pump inlet line. If inlet line is not restricted,
remove gear pump and repair or replace as necessary.
NOTE: Implement relief valve pressure can also be
tested with hydraulic tester (pressure and flow) in series
with the gear pump fitting and the disconnected hose.
Use pressure gauges on hydraulic tester and follow pro-
cedure for Implement Relief Pressure Test in this sec-
tion.
14.Relieve hydraulic system pressure (see Relieving
Hydraulic System Pressure in the General Information
section). Disconnect tester from lift control valve fitting
and hydraulic hose. Reconnect hose to the control valve
fitting.
1. Lift control valve 2. Hose from gear pump
Figure 25
1
2
Hydraulic
System