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Purging Procedures – Tuff Torq
Transaxle
Due to the effects air has on efficiency in hydrostatic
drive applications, it is critical that it be purged from the
system.
These purge procedures should be implemented any
time a hydrostatic system has been opened to facilitate
maintenance or any additional oil has been added to
the system.
Air creates inefficiency because its compression and
expansion rate is higher than that of the oil normally
approved for use in hydrostatic drive systems. 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". In the latter case, oil may
overflow.
Before starting, make sure the transaxle is at the "cold"
oil level; refer to "General Specifications" on page 1 - 3.
Top off as needed during the process.
1.
Raise the two rear tires from the ground and
support the tractor securely with jack stands.
2.
Disconnect the seat switch and attach a jumper
wire across the terminals so that the tractor will
run without an operator in the seat.
3.
Start the engine and maintain low idle speed.
4.
Depress the forward and reverse hydrostatic
control pedals alternately until the wheels begin to
rotate. Shut the engine off.
5.
Lower the tractor to the ground.
Use extreme caution while completing the
following purging process.
6.
Restart the engine and set at low idle speed.
260 Series Tractor Service Manual
TUFF TORQ TRANSAXLE
7.
Depress the forward hydrostatic control pedal and
push the tractor rearward. Then depress the
reverse hydrostatic control pedal and push the
tractor forward until the tractor is able to move
under its own power.
8.
Increase engine speed to full RPM.
9.
Operate the tractor from seated position, making
quick starts and panic stops, until the transaxle is
operating properly. Top forward speed is 5.2
MPH (8.3km/hr).
10. Top off the reservoir with oil through the reservoir/
fill cap, filling it to the cold fill mark.
Brake – Tuff Torq Transaxle
Always set the parking brake when you stop the
machine or leave it unattended. If the parking brake
does not hold securely, an adjustment is required.
Checking the Brake
1.
Park the machine on a level surface, disengage
the power take off (PTO), set the parking brake,
and turn the ignition key to "OFF" to stop the
engine. Remove the ignition key.
2.
Rear wheels must lock and skid when you try and
push the tractor forward. Adjustment is required if
the wheels turn and do not lock; refer to "Adjusting
the Brake – Tuff Torq Transaxle" on page 3 - 15.
3.
Release the brake and move the drive control rod
to the "PUSH" position. Wheels should rotate
freely.
4.
If both conditions are met, no adjustment is
required.
Adjusting the Brake – Tuff Torq
Transaxle
The brake lever is on top of the transaxle (Figure 109).
If the parking brake does not hold securely, an
adjustment is required.
1.
Check the brake before you adjust it, refer to
"Checking the Brake" on page 3 - 15.
3 - 15
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