Flushing The Hydraulic System - Toro Groundsmaster 3280-D Service Manual

Flushing the Hydraulic System

Hydraulic System: Service and Repairs
Flush the hydraulic system whenever there is a severe component
failure or the system is contaminated (for example, the fluid appears
milky, black, or contains metal particles).
If a component failure occurs in the traction circuit; refer to the
Traction Circuit Component Failure (page 5–7)
regarding the importance of removing contamination from the
traction circuit.
1. Ensure that the hydraulic fluid is at normal operating temperature by
operating the machine for at least 20 minutes.
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
2. Park the machine on a level surface, lower the cutting deck, shut off the
engine, set the parking brake, and remove the key from the key switch.
Note: Ensure that you clean all the hydraulic connections that are
disconnected for draining.
3. Drain the hydraulic fluid from the hydraulic reservoir (front axle); refer to
the Operator's Manual.
4. Clean the area around the mounting area of the hydraulic-fluid filter. Remove
and replace the hydraulic-fluid filter.
5. Drain the complete hydraulic system. Drain all the hoses, tubes, and
components while the system is warm. Flush the hoses and tubes to remove
any contamination.
6. Ensure that the mounting surface of the hydraulic-fluid filter is clean. Apply
clean hydraulic fluid to the gasket on new filter. Tighten the filter until the
gasket contacts the mounting plate, then tighten the filter 3 quarters of a turn.
Using other hydraulic fluids could damage the hydraulic system.
Use the hydraulic fluids that are specified in the Operator's Manual.
7. Fill the hydraulic reservoir (front axle) with the correct quantity of new
hydraulic fluid; refer to the Operator's Manual.
IMPORTANT
IMPORTANT
CAUTION
Releasing Pressure from the
5–6).
IMPORTANT
Page 5–80
for information
Groundsmaster ® 3280-D/3320
05138SL Rev B