Transaxle Fluid Change - Husqvarna Z 548 Manual Del Operador

LUBRICATION

Transaxle Fluid Change

Fluid and Filter Change
The hydraulic drive is designed with an external
filter for ease of maintenance. To ensure
constant fluid quality levels and longer life, an
oil filter change interval of every 400 hours is
recommended.
Drain old oil filters of all free-flowing oil prior
to disposal. Place used oil in appropriate
containers and dispose of it in accordance with
laws in your area.
The following procedure is performed with the
pump installed in the vehicle.
1. Park on a level surface. Engage the park
brake.
2. Place an oil drain pan with a 8 quart capacity
beneath the oil reservoir.
3. Remove the oil filter cover and discard the
gasket.
4. After the oil has drained, remove the filter from
the housing.
5. Install a new filter and gasket into the filter
cover and install the assembly into the
transaxle, turning it three-quarters to one full
turn after the filter gasket contacts the filter
base surface.
6. Repeat the procedure the opposite side.
7. Remove the top fill port plug from the left and
right side transaxles
8. Fill with 20W50 motor oil until the oil appears
at the bottom of each transaxles' top port
approximately 2 quarts (1.89 liters) per
with
transaxle, 4 quarts (3.78 liters) total.
9. Install the top port plug into each transaxle as
the oil level reaches the port. Torque the top
port plugs to 180 in./lbs.
10. Continue to fill the transaxles through the
expansion tank until the FULL COLD line
is reached. This will take approximately 23
additional ounces (0..68 liter).
11. 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.
Purge procedures must be implemented if
the hydrostatic system has been opened for
maintenance or when more 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.
Perform the procedure first 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. Release the park brake.
2. With the bypass valve open and the engine
running at fast idle, slowly move the steering
controls in the forward and reverse directions
five or six times. As air is purged from the unit,
the oil level will drop.
3. With the bypass linkage valve and the engine
running, slowly move the steering controls
in the forward and reverse directions five or
six times. Check the oil level and add oil as
required after stopping the engine.
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.
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