53
PERIODIC SERVICE
7. Re-install the filter guard (3) with 3 hex head bolts (4).
Torque bolts (4) to 7.35 N-m (5.42 lbf-ft) securely.
8. Repeat steps 2-7 on the opposite side transaxle drive.
9. Drain old oil filters of all free flowing oil prior to
disposal. Place used oil in appropriate containers and
deliver to an approved recycling collection facility.
10.Remove the breather port plug (9) from the left side
and right side transaxles prior to filling with oil. This will
allow the transaxles to vent during oil fill.
11.Remove the cap from the transaxle fluid tank located
on the machine frame.
12.Fill with 20W-50 motor oil until oil just appears at the
bottom of the breather port. Install the breather port
plug (5) into transaxle. Torque the plug (5) to 20.34 N-
m (15.0 lbf-ft).
13.Continue to fill the transaxles through the transaxle
fluid tank until the "Full Cold" line is reached on the
transaxle fluid tank.
14.Re-install the transaxle fluid tank cap by hand. Be
careful to not overtighten.
15.Proceed to the purge procedure.
C
Purging Procedures
Due to the effects air has on efficiency in hydrostatic drive
applications, it is critical that it is purged from the system.
Air creates inefficiency because its compression and
expansion rate is higher than that of the oil approved for
use in hydrostatic drive systems.
These purge procedures should be implemented any time
a hydrostatic system has been opened to facilitate
maintenance or the oil has been changed.
The resulting symptoms in hydrostatic systems may be:
1. Noisy operation.
2. Lack of power or drive after short term operation.
3. High operation temperature and excessive expansion
of oil.
Before starting, make sure the transaxle is at the proper
oil level. If it is not, fill to the specifications outlined in this
manual.
The following procedures are best performed with the
machine drive wheels off the ground. Then repeated
under normal operating conditions. If this is not possible,
then the procedure should be performed in an open area
free of any objects or bystanders.
1. Disengage the brake if activated.
2. With the bypass valve open and the engine running,
slowly move the motion control levers in both forward
and reverse directions (5 or 6 times).
3. With the bypass valve closed and the engine running,
slowly move the motion control levers in both forward
and reverse directions (5 to 6 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 transaxle operates at normal noise levels and
moves smoothly forward and reverse at normal
speeds, then the transaxle is considered purged.
B
Changing Transaxle Fluid
(See "Replacing Transaxle Oil Filter Cartridge" in "EVERY
400 HOURS" in "PERIODIC SERVICE" section.)
(1) Transaxle
(2) Transaxle oil filter
(3) Filter guard
(4) Hex flange head bolt
(5) Breather port plug
(A) FRONT
(B) OIL LEVEL
Summary of Contents for Z121S-AU
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