Service Manual

Rev. 000
HYDRAULIC SYSTEM
Figure 101 fig 38.bmp
6-4
TX 413 Service Manual
A
Adjusting the Tracking of the Traction
Control, Full Forward Position
If the traction unit does not drive straight when you
hold the traction control against the reference bar,
complete the following procedure:
Note: Whenever an adjustment is made, check to
make sure the set screws contact stops in
the full forward motion.
1. Drive the traction unit with the traction control
against the reference bar, noting which direction
the traction unit veers.
2. Release the traction control.
Note: When the traction control is stroked fully
forward and the unit has severe pull to
the left or right, a problem with the pump
control linkage or a hydraulic component is
indicated.
Note: When the traction control is stroked fully
and a gradual pull happens, the tracking
adjustment can be made. A very slight
tracking error is considered normal.
3. If the traction unit veers left, loosen the right jam
nut and adjust the tracking set screw on the rear
of traction control (Fig. 101).
Purging Air Procedures
Due to the effects air has on efficiency in hydrostatic
drive applications, it is critical that air is purged from
the system.
These purge procedures should be implemented
anytime a hydrostatic system or hydraulic lines
has been opened to facilitate maintenance or any
additional oil has been added to the system.
Air creates inefficiency because it has compression
and expansion rates that are higher than that of oil.
Trapped air in the oil may cause the following
symptoms:
1. Noisy operation.
2. Lack of power or drive after short-term operation.
3. High oil temperature and excessive expansion of
oil.
Before starting, make sure the reservoir is at
the proper oil level. If it is not, fill to the vehicle
specifications, refer to the Hydraulic Reservoir Tank,
Checking the Hydraulic Fluid section on page 3-4.
The following procedures should be performed with
the vehicle drive tracks off the ground, then repeated
under normal operating conditions.
1. Lift/support the unit so that both tracks are off the
ground and free to rotate.
2. Start the engine and run it at slow idle engine
speed for about 20 seconds.
3. Push the traction control to full forward position
and hold. The tracks should begin to slowly turn.
Once the tracks begin to turn smoothly, allow to
run for 20 seconds. Pull the traction control to
full reverse position and hold. Again, the tracks
should begin to slowly turn in reverse. Once the
tracks begin to turn smoothly, allow to run for 30
seconds.
4. Raise and lower the loader arm for 4 complete
cycles. Raise loader arm and put into the float
position, loader arm should drop.
5. Cycle the dump cylinder for 4 complete cycles.
6. Stop the engine and check the oil level in the
reservoir and add if necessary.
7. It may be necessary to repeat Steps 2 through
6, until all the air is completely purged from the
system.
C
B
A. Right jam nut B. Operator Handle
C. Reference Bar