Transmission Purging - Husqvarna MZ52LE Operator's Manual

4. Install the new filter by hand, turning it three-
quarters to one full turn after the filter gasket
contacts the filter base surface.
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.
5. Reinstall the filter guard. Torque screws to
65 in/lbs. each.
6. Repeat steps on the opposite side.
7. 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.
8. Remove the top port plug (see illustration) from
the left side and right side of the transaxles prior
to filling with oil. This will allow the transaxles to
vent during oil fill.
9. Remove the cap from the transaxles' expansion
tank located on the vehicle frame.
10. Fill with 20W50 motor oil until oil just appears
at the bottom of each transaxles' top port
(approximately 2 quarts per transaxle, 4 quarts
total). Install the top port plug into each transaxle
as the oil level reaches the port.
11. Install 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 23 additional
ounces).
13. Reinstall the expansion tank cap by hand. Be
careful to not overtighten.
48
LUBRICATION

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
any time a hydrostatic system has been opened for
maintenance or if any 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
previously.
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 disengaged and the
engine running at fast idle, slowly move the
directional control in both 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 engaged and the engine
running, slowly move the directional control in
both 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.
5. After the vehicle has been used two times, the oil
level should be checked while the oil is cold and
adjusted accordingly.