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Checking the
Hydraulic-Fluid Level
Service Interval: Before each use or daily
1.
Allow the hydraulic fluid to cool down. Check the
oil level when the fluid is cold.
2.
Check expansion reservoir and if necessary
add Toro
®
HYPR-OIL
FULL COLD line
Figure 83
1. Expansion tank
™
500 hydraulic fluid to the
(Figure
83).
2. Engine
Changing the Hydraulic
Fluid and Filters
Service Interval: After the first 100 hours—Change
Every 400 hours or yearly, whichever comes
first—After the initial change—change the
hydraulic-system filters and fluid when using
Toro
®
HYPR-OIL
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 62)
specifications.
Purge any air in the system after you install the new
filters and add fluid. Refer to
System (page
65). Repeat the bleeding process until
the fluid remains at the F
after purging.
Important:
Failure to properly perform this
procedure can result in irreparable damage to the
transaxle drive system.
Removing Hydraulic Fluid and
Filters
g334849
This procedure varies depending on the drive system
of the model. If it is unclear which drive system is on
the model, contact your Authorized Service Dealer.
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 and remove the vent plug as follows:
Note:
Ensure that you keep track of the vent
plug after removal, as it can be easy to misplace.
•
For ZT 4400 Hydros, use an extension and
7/16-inch socket, access the vent plug from
the top of the machine through the holes
near the roll-bar mounts
63
the hydraulic-system filters and
fluid.
™
500 fluid (change it more
Bleeding the Hydraulic
C
line in the reservoir
ULL
OLD
(Figure
for fluid
84).
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