Toro 74901 Operator's Manual page 56

Replacing the Hydraulic Filters and
Hydraulic Oil
Service Interval: After the first 250 hours—Change the
hydraulic filters and hydraulic oil when
using any type of oil.
Every 250 hours—Change the hydraulic filters and
hydraulic oil when using Mobil
dirty or dusty conditions).
Every 500 hours—Change the hydraulic filters and
hydraulic oil when using Toro
hydraulic oil (more often in dirty or dusty conditions).
To replace the hydraulic oil, the filters need to be removed.
Replace both at the same time; refer to Servicing the
Hydraulic System (page 55) for the oil specifications.
1. Disengage the blade-control switch (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.
3. Raise the machine and support it with jack stands
(Figure 85).
Figure 85
1. Jack stands
4. Remove both the mower belt and the pump-drive
belt; refer to Replacing the Mower Belt (page 50) and
Replacing the Hydraulic Pump-drive Belt (page 52).
Note: This prevents oil from getting on the belts.
5. Place a drain pan under the filter, remove the old filter,
and wipe the surface clean (Figure 86).
® 1 oil (more often in
® ™
HYPR-OIL 500
56
Figure 86
Bottom View of Machine
1. Filter locations
6. Apply a thin coat of hydraulic oil to the rubber gasket
on the replacement filter (Figure 86).
7. Install the replacement hydraulic filter.
8. Install the pump-drive belt and the mower belt.
9. Remove the jack stands and lower the machine (Figure
85).
10. Add oil to the hydraulic reservoir and check for any
leaks.
11. Clean up any spilled oil.
12. Start the engine and let it run for about 2 minutes to
purge air from the system.
13. Stop the engine and check for leaks.
14. Check the oil level while the oil is cold.
15. If required, add oil to the hydraulic reservoir.
Note: Do not overfill.
1
2
G008968
2. Hydraulic filter