Purging Procedures - Hydro-Gear Transaxle - Toro 260 Series Service Manual

HYDRO-GEAR TRANSAXLE
11. Remove the tunnel cover to check or adjust the
belt tension. Loosen the back side idler pulley, A,
and move it in the slotted mounting hole on the
idler arm, B. For additional adjustment, turn the
eccentric C, on the eccentric mounted idler pulley, D.
Install the left rear tire only (Figure 141).
Figure 141
NOTE: When installing a new transaxle in the machine
or if any work was performed internally on the
transaxle, make sure the system is purged prior to
doing any neutral adjustment. Refer to "Purging
Procedures – Hydro-Gear Transaxle" on page 4 - 8.
12. Reconnect the negative battery cable.
13. Attach a jumper wire across the seat switch plug
terminals so the tractor will run without an
operator in the seat. If adjustment is needed, refer
to the "Neutral Adjustment – Hydro-Gear
Transaxle" on page 4 - 17.
14. Install the fender and seat assembly and install
the center plate between the fender and seat.
Install the right tire.
15. Operate the tractor and make sure all safety
features are working. Check the forward and
reverse operation of the tractor. If you find there is
not enough speed in reverse or forward, follow the
adjustment procedures for the foot control; refer to
"Foot Control Adjustment Procedure" on page 4 -
10.
4 - 8
Purging Procedures – Hydro-Gear
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.
MVC-161X
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
specified oil level; refer to page 1 - 4.
The following procedures should be performed with the
vehicle drive wheels off the ground, then repeated
under normal operating conditions.
1. With the bypass valve open and the engine
running, slowly move the directional control (foot
control) in both forward and reverse directions 5 to
6 times; as air is purged from the unit, the oil level
will drop.
2. With the bypass valve in the closed position and
the engine running, slowly move the directional
control valve (foot control) in both forward and
reverse directions 5 to 6 times. After stopping the
engine, check the oil level and add oil as required.
260 Series Tractor Service Manual