Flush Hydraulic System - Toro Groundsmaster 4500-D Series Service Manual

Flush Hydraulic System

Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Flush the hydraulic system any time there is a severe component
failure or the system is contaminated. Contaminated oil may appear
milky or black or may contain metal particles.
Flush hydraulic system when changing from petroleum base
hydraulic fluid to a biodegradable fluid. Operate machine under
normal operating conditions for at least four (4) hours before
draining.
If a component failure occurred in the closed loop traction circuit
(e.g. piston pump or wheel motor), filtering the traction circuit is
recommended. See
5–93).
1. Park machine on a level surface. Lower cutting decks to the ground, stop
engine and apply parking brake. Remove key from the ignition switch.
Before disconnecting or performing any work on the hydraulic
system, all pressure in the system must be relieved. See
Hydraulic System Pressure (page
Make sure to clean around any hydraulic connections that will be
disconnected for draining.
2. Drain hydraulic reservoir. Remove suction screen from reservoir and clean
thoroughly. Consider removing and cleaning reservoir if necessary.
3. Drain hydraulic system. Drain all hoses, tubes and components while the
system is warm.
4. Remove and replace both hydraulic oil filters.
Follow all local codes and regulations when recycling or disposing
hydraulic fluid and filters.
5. Inspect and clean hydraulic reservoir (see
IMPORTANT
IMPORTANT
IMPORTANT
Filtering Closed−Loop Traction Circuit (page
WARNING
5–4).
IMPORTANT
IMPORTANT
Hydraulic Reservoir (page
Page 5–91
Relieving
Hydraulic System: Service and Repairs
5–176)).