Husqvarna P-ZT 54 Operator's Manual page 30

LUBRICATION
10. Fill with 20W50 motor oil until oil just
appears at the bottom of each transaxles'
top port (approximately 1.9 liters per
transaxle, 3.8 liters total). Install the top
port lug into each transaxle as the oil level
reaches the port.
11. Reinstall and torque the top port plugs to
180 in./lbs.
12. Continue to fill the transaxles through the
expansion tank until the FULL COLD line
is reached (this will take approximately .68
additional liters).
13. Reinstall the expansion tank cap by hand.
Do not overtighten.
Transmission Purging
Due to the effects air has on efficiency in
hydrostatic drive applications, it is critical to purge
the system.
These purge procedures should be implemented
if the hydrostatic system has been opened for
maintenance or additional oil has been added to
the system.
Resulting symptoms in hydrostatic systems may
be:
• Noisy operation.
• Lack of power or drive after short term
operation.
• High operation temperature and excessive
expansion of oil.
• Shortened component life.
Before starting, make sure the oil tank is at the
proper oil level. If not, fill to the specifications
outlined above.
The following procedures are best performed
with the vehicle drive wheels off the ground, then
repeated under normal operating conditions.
See Moving Machine By Hand in the Operation
section for bypass linkage adjustments.
1. Disengage the brake if activated.
2. With the bypass linkage open and the
engine running at fast idle, slowly move the
directional control in both forward and reverse
directions (5 or 6 times). As air is purged from
the unit, the oil level will drop.
3. With the bypass linkage closed and the
engine running, slowly move the directional
control in both forward and reverse directions
(5 to 6 times). Check the oil level and add oil
as required after stopping the engine.
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4. It may be necessary to repeat Steps 2 and 3
until all the air is completely purged from the
system. When the hydraulic drive operates
at normal noise levels and moves smoothly
forward and reverse at normal speeds, the
hydraulic drive is considered purged.
5. After the vehicle has been used two times, the
oil level should be checked while the oil is cold
and adjusted accordingly.
WARNING! Escaping hydraulic oil
under pressure can have sufficient force to
penetrate the skin, causing serious injury. If
injured by escaping fluid, see a doctor at once.
Serious infection or reaction can develop if
proper medical treatment is not administered
immediately.