Tracking Adjustment; Purging Procedure - Toro Z MASTER 2000 Series Service Manual

Adjusting the Motion Control Linkage (Neutral Setting) (continued)

Tracking Adjustment

Purging Procedure

2000 Series Z MASTER® Service Manual
3438-778 Rev A
14. Raise the mower deck and install the height-of-cut pin.
15. Check for proper operation and ensure that the machine does not creep in
neutral with the park brake disengaged.
1. Disengage the PTO switch.
2. Drive to an open, flat area and move the motion control levers to the
neutral-lock position.
3. Move the throttle midway between the FAST and SLOW positions.
4. Move both motion control levers fully forward until they both hit the stops
in the T-slot.
5. Observe which direction the machine tracks.
6. If the machine tracks to the right, insert a 3/16 inch hex wrench through
the access hole in the right front cover panel and rotate the tracking screw
clockwise or counterclockwise to adjust the travel of the lever.
7. If the machine tracks to the left, insert a 3/16 inch hex wrench through
the access hole in the left front cover panel and rotate the tracking screw
clockwise or counterclockwise to adjust the travel of the lever.
8. Drive the machine, check the full forward tracking.
9. Repeat the adjustment until the desired tracking is obtained.
Due to the effects air has on efficiency in hydrostatic drive applications, it
is critical that it be purged from the system. This purge procedure should
be implemented any time a hydrostatic system has been opened to facilitate
maintenance, any additional oil has been added to the system, or a replacement
transaxle has been installed. Air creates inefficiency because its compression
and expansion rate is higher than that of the oil in hydrostatic drive systems.
The resulting symptoms in the hydrostatic system may be:
•
noisy operation
•
lack of power or drive after a short period of operation
•
high operating temperature and excessive expansion of oil, in the latter case,
oil level may be high in the expansion tank or overflow
The following procedure should be performed with the wheels off the ground and
then repeated under operating conditions.
1. With the bypass valve open (push position) and the engine running, slowly
move the directional controls (forward/reverse levers) in both forward and
reverse directions 5-6 times, as air is purged from the transaxles, the oil
level will drop.
2. With the bypass valves in the closed position (run position) and the engine
running, slowly move the directional control levers in both forward and
reverse directions 5-6 times.
3. It may be necessary to repeat steps 1 and 2 until all air is completely purged
from the transaxles. When the transaxles move forward at normal speed,
purging is complete.
Page 7–7 Drive System: Service and Repairs