Bleeding The Hydraulic System - Toro 74410 Operator's Manual

Warning
Hydraulic fluid escaping under pressure can
penetrate skin and cause injury.
• If hydraulic fluid is injected into the skin, it
must be surgically removed within a few hours
by a doctor familiar with this type of injury;
otherwise, gangrene may result.
• Keep your body and hands away from pin hole
leaks or nozzles that eject high-pressure
hydraulic fluid.
• Use cardboard or paper to find hydraulic leaks.
• Safely relieve all pressure in the hydraulic
system before performing any work on the
hydraulic system.
• Ensure that all hydraulic fluid hoses and lines
are in good condition and all hydraulic
connections and fittings are tight before
applying pressure to the hydraulic system.
Replacing the Hydraulic Filter
Change the hydraulic filter:
• After the first 8 operating hours
• After every 200 operating hours
Use a summer filter above 32°F (0°C)
Use a winter filter below 32°F (0°C)
1. Disengage the PTO, move the motion control levers to
the neutral locked position, and set the parking brake.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
Important Do not substitute an automotive oil filter for
a hydraulic filter; this can severely damage the hydraulic
system.
3. Place a drain pan under the filter, remove the old filter,
and wipe the filter adapter gasket surface clean
(Fig. 43).
Figure 43
1. Hydraulic filter
4. Apply a thin coat hydro fluid to the rubber gasket on the
replacement filter (Fig. 44).
1. Hydraulic filter
2. Gasket
5. Install the replacement hydraulic filter onto the filter
adapter, but do not tighten.
6. Fill the hydraulic tank with hydraulic fluid until the
fluid overflows the filter
7. Turn the oil filter clockwise until the rubber gasket
contacts the filter adapter, then tighten the filter an
additional 1/2 turn (Fig. 44).
8. Clean up any spilled fluid.
9. Add fluid to the cold level of the baffle in the hydraulic
tank.
10. Start the engine and let it run for about 2 minutes to
purge air from the system. Stop the engine and check
for leaks.
Note: If one or both wheels will not drive, refer
Bleeding Hydraulic System on page 35.
11. Check the fluid level while the fluid is warm.
Note: The fluid should be between cold and hot.
12. If required, add fluid to the hydraulic tank. Do not
overfill.

Bleeding the Hydraulic System

The traction system is self bleeding; however, it may be
necessary to bleed the system if the fluid is changed or after
work is performed on the system.
1. Raise the rear of the machine so that the wheels are off
the ground and support it with jack stands.
1
2. Start the engine and run at low idle speed.
3. Engage the lever and traction on one side and spin the
m-4763
wheel by hand.
35
1
3
2
Figure 44
3. Adapter
m–1256