Hydraulic System Maintenance; Checking The Hydraulic-Fluid Level; Changing The Hydraulic Filter And Fluid - Toro 74891 Operator's Manual

Hydraulic System
Maintenance
Oil Type: Toro HYPR-OIL® 500 or 20W-50 motor oil.
System Capacity: 4.495 L (152 oz) with a filter change.
Important: Use oil specified or equivalent. Other fluids
could cause system damage.
Checking the Hydraulic-Fluid
Level
Service Interval: Every 25 hours
Check the expansion reservoir, and, if necessary, add fluid
to the Full Cold line.
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Figure 50
1. Expansion reservoir
2. Full Cold line
Changing the Hydraulic Filter
and Fluid
The filter and fluid are changed at the same time. Once the
new filter is installed and fluid is added, any air in the system
must be purged.
The bleeding process is repeated until the fluid remains at
the Full Cold line in the reservoir after purging. Failure to
properly perform this procedure can result in irreparable
damage to the transaxle drive system.
Removing the Hydraulic Filters
Important: When the hydraulic filter is removed, all of
the hydraulic fluid in each transaxle will drain out. Use a
container that holds 4.495 L (152 oz) or larger.
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3. Engine
1. Shut off the engine, wait for all moving parts to stop,
allow the engine to cool, remove the key, and engage
the parking brake.
2. Locate the filter and guards on each transaxle drive
system and remove the 3 screws securing the filter
guard (Figure 51).
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3
Right side shown
1. Transaxle drive
2. Hydraulic filter
3. Filter guard
3. Carefully clean the area around the filters.
Important: Do not allow dirt to enter the
hydraulic system, as it may cause damage.
4. Place a container below the filter and drain the fluid.
5. Locate and remove the vent plug on each transmission.
6. Unscrew the filter and allow the fluid to drain from
the drive system.
7. Repeat this procedure for both filters.
Installing the Hydraulic Filter
Service Interval: After the first 50 hours
Every 400 hours
1. Using the 3 screws to install the filter guards over each
filter removed previously.
2. Verify that the vent plugs are removed before adding
the fluid.
3. Slowly pour the specified fluid through the expansion
reservoir until fluid comes out of a vent-plug hole.
4. Install the vent plug and torque it to 20 N•m (180 in-lb).
5. Continue to add fluid through the expansion reservoir
until fluid comes out of the remaining vent-plug hole
on the second transmission.
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Figure 51
4. Screws
5. Vent plug
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