Changing The Hydraulic Fluid And Filters - Toro 77281 Operator's Manual

Changing the Hydraulic
Fluid and Filters
Service Interval: After the first 75 hours—Change the
hydraulic-system filters and fluid.
Every 400 hours—After the initial
change—change the hydraulic-system
filters and fluid when using Toro
500 fluid. (Change it more often under dirty or
dusty conditions)
To replace the hydraulic fluid, the filters need to be
removed. Replace both at the same time; refer to
Hydraulic-Fluid Specifications (page 66)
specifications.
Purge any air in the system after you install the new
filters and add fluid; refer to
System (page 68). Repeat the bleeding process until
the fluid remains at the F
after purging. Failure to properly perform this
procedure can result in irreparable damage to the
transaxle drive system.
Removing Hydraulic-System
Filters
1. Park the machine on a level surface, disengage
the blade-control switch (PTO), and engage the
parking brake.
2. Shut off the engine, remove the key, and wait
for all moving parts to stop before leaving the
operating position.
3. Allow the engine to cool.
4. Locate the filter and guards on each
transaxle-drive system
5. Remove the 3 screws securing the filter guard
and guard (Figure
® HYPR-OIL
for fluid
Bleeding the Hydraulic
C line in the reservoir
ULL OLD
(Figure 91).
91).
™
1. Top port plug
2. Fill port plug
3. Filter
6. Carefully clean the area around the filters.
Important:
hydraulic system, or contamination may
occur.
7. Place a drain pan below the filter to catch the
fluid that drains when the filter and vent plugs
are removed.
8. Locate and remove the vent plug on each
transmission.
9. Unscrew the filter to remove it, and allow the
fluid to drain from the drive system.
10. Repeat this procedure for both filters.
Installing the Hydraulic-System
Filters
1. Apply a thin coat of hydraulic fluid on the surface
of the rubber seal of each filter.
2. Turn the filter clockwise until the rubber seal
contacts the filter adapter, then tighten the filter
an additional 3/4 to 1 full turn.
3. Repeat for the opposite filter.
4. Install the filter guards over each filter that you
previously removed.
5. Use the 3 screws to secure the filter guards.
6. Verify that the vent plugs are removed before
adding the fluid.
7. Remove the top port plug
left side and right side transaxles prior to filling
with oil.
This will allow the transaxles to vent during oil fill.
67
Figure 91
4. Filter guard
5. Screws
Do not allow dirt to enter the
(Figure 91) from the
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