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 – 45
Charge Hydraulic System
NOTE: When initially starting the hydraulic system with
new or rebuilt components such as wheel motors, gear
pump or lift cylinder, it is important that the hydraulic sys-
tem be charged properly. Air must be purged from the
system and its components to reduce the chance of
damage.
IMPORTANT: Change hydraulic oil filter whenever
hydraulic components are repaired or replaced.
1. Park machine on a level surface with engine off.
2. Make sure all hydraulic connections, lines and com-
ponents are secured tightly.
3. If component failure was severe or the system is con-
taminated, flush and refill hydraulic system and tank
(see Flush Hydraulic System in this section).
4. Make sure hydraulic tank is full. Add correct oil if nec-
essary.
5. Check traction control components for proper adjust-
ment, binding or damaged parts.
6. Disconnect wire harness connector from engine fuel
stop solenoid to prevent the engine from starting.
7. Make sure traction control levers and the lift control
lever are in the neutral position. Turn ignition key switch
and engage starter for ten (10) seconds to prime the
transmission and gear pump. Repeat this step again.
8. Connect wire harness connector to fuel stop sole-
noid.
WARNING
Before jacking up the machine, review and follow
Jacking Instructions in Chapter 1 – Safety.
9. Raise both drive wheels off the ground and place
jackstands under the frame to support the machine.
CAUTION
Make sure machine is safely supported so it will
not move and accidentally fall to prevent injuring
anyone under machine.
10.Make sure traction control levers and lift control lever
are in the neutral position. Start engine and run at low
idle speed (1500 to 1650 RPM). The charge and gear
pumps should pick up oil and fill the hydraulic system.
If there is no indication of fill in 30 seconds, stop the en-
gine and determine the cause.
11. After the hydraulic system starts to show signs of fill,
actuate lift control lever until the lift cylinder moves in
and out several times. If the lift cylinder does not move
after 3 to 5 seconds or if the pump emits abnormal
sounds, shut the engine off immediately and determine
cause or problem. Inspect for the following:
A. Loose oil filter or suction lines.
B. Incorrect hose routing.
C. Blocked suction line.
D. Faulty implement relief valve.
E. Faulty gear pump.
12.After lift cylinder moves normally, proceed to step 13.
13.Operate the traction control levers in the forward and
reverse directions. The drive wheels should rotate in the
proper direction. If the wheels rotate in the wrong direc-
tion, stop engine, inspect wheel motor location and hy-
draulic lines to wheel motors (see Transmission
Installation in the Service and Repairs section of this
chapter).
14.Adjust traction control levers to the neutral position
(see Operator’s Manual).
15.Lower machine to ground.
16.If the transmission or a wheel motor was replaced or
rebuilt, operate the traction circuit on level ground so
both drive wheels turn slowly for 10 minutes.
17.Operate machine by gradually increasing its work
load to full over a 10 minute period.
18.Stop the machine. Check hydraulic oil level and ad-
just if necessary (do not overfill). Check hydraulic com-
ponents for leaks. Tighten any loose connections.
Hydraulic
System