Service And Repairs; General Precautions For Removing And Installing The Hydraulic System Components - Toro Groundsmaster 4300-D Service Manual

Service and Repairs

General Precautions for Removing and Installing the Hydraulic
System Components
Before Repairing or Replacing the Components
After Repairing or Replacing the Components
Groundsmaster ® 4300-D
16226SL Rev C
1. Before removing any parts from the hydraulic system, park the machine on
a level surface, lower the cutting decks, shut off the engine, set the parking
brake, and remove the key from the key switch.
2. Clean the machine before you disconnect, remove, or disassemble the
hydraulic components.
Note: Cleanliness is necessary whenever you work on the hydraulic
equipment. Ensure that you clean the hydraulic components, hoses,
connections, and fittings.
3. Label all the disconnected hydraulic lines and hoses for proper installation
after repairs are completed.
4. Note the position of the hydraulic fittings (especially elbow fittings) on the
hydraulic components before removal.
Note: Mark the parts, if necessary before removal and ensure that they are
aligned properly when installing the hydraulic fittings, hoses, and tubes.
Before opening the hydraulic system, operate all the hydraulic
controls to release system pressure and avoid injury from the
pressurized hydraulic fluid; refer to
Hydraulic System (page
5. The hydraulic fluid may be hot. Be careful when you loosen and remove
the hydraulic system components.
6. Install clean caps or plugs on the hydraulic lines, hydraulic fittings, and
components that are left open or exposed to prevent hydraulic system
contamination. Cap the opening as soon as the line or port is exposed.
1. Check the hydraulic-fluid level in the hydraulic tank and add correct quantity
of fluid if necessary. Use the hydraulic fluids that are specified in the
Operator's Manual.
Drain and fill the hydraulic tank and change the oil filter if the
component failure is severe or the system is contaminated; refer to
Flushing the Hydraulic System (page
2. If a component failure occurred in the closed-loop traction circuit (e.g., piston
pump or wheel motor), filtering the traction circuit is necessary; refer to
Filtering the Closed-Loop Traction Circuit (page
3. Lubricate the O-rings and seals with clean hydraulic fluid before installing
the hydraulic components.
CAUTION
Releasing Pressure from the
4–6).
IMPORTANT
4–89).
Page 4–87
4–91).
Hydraulic System: Service and Repairs