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CHECK SPARK PLUGS
Service Interval: Every 100 Hours
Remove spark plugs, check condition and reset
gaps, or replace with new plugs. See Engine
Owner's Manual.
CHANGE HYDRAULIC SYSTEM FILTER
AND FLUID
Service Interval: Every 400 Hours
ZT-4400 and 5400
This transaxle is designed with a serviceable
filter. To ensure constant fluid quality levels
and longer life, an initial oil and filter change at
100 hours is recommended. Subsequent
changes are recommended at 400 hour
intervals minimum, or yearly, whichever comes
first.
The following procedure can be performed with
the transaxle installed in the vehicle, and the
vehicle on level ground. Apply the bypass
valve and lock the vehicle parking brake.
1. Place an oil drain pan (12" or more in
diameter and 8 qt. capacity is optimal)
beneath the oil filter. Remove the oil filter
cover from the transaxle to drain the oil.
Remove the O-ring from the cover and
discard the O-ring.
2. After the oil has drained from the transaxle,
remove the oil filter from the transaxle
housing.
3. Install a new filter (Hydro-Gear part number
71943). Install a new O-ring onto the filter
cover and install the filter cover. See figure
below. Torque to 480-580 in-lbs [54.23-
65.53 Nm]
4. Remove the top oil fill vent port plug and fill
the transaxle with new 20W50 motor oil
through the expansion tank port/fill port until
oil reaches the oil fill vent port.
5. Install the top oil fill vent port plug and
continue filling the system with oil until the
fill line is reached in the expansion tank.
6. Drain old oil filter of all free flowing oil prior
to disposal. Place used oil in appropriate
containers and deliver to an approved
recycling collection facility.
7. Proceed to the purge procedure.
CAUTION
Raising the mower for service or
maintenance relying solely on
mechanical or hydraulic jacks could be
dangerous. The mechanical or hydraulic
jacks may not be enough support or
may malfunction allowing the unit to fall,
which could cause injury.
Do not rely solely on mechanical or
hydraulic jacks for support. Use
adequate jack stands or equivalent
support.
HYDRAULIC SYSTEM AIR PURGE
Service Interval: As Required
Due to the effects air has on efficiency in
hydrostatic drive applications, it is critical that
air is removed or purged from the system.
These purge procedures must be performed
anytime a hydrostatic system has been opened
for maintenance or repair, or if any additional oil
has been added to the system.
33
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