MTD Garden Tractors User Manual page 148

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2. If contaminate is observed on the reservoir/
expansion tank screen, poor maintenance is
indicated. Remove the reservoir/expansion
tank, wash clean, dry and reinstall. If the
screen is pierced, the reservoir/expansion tank
should be replaced.
3. If the natural color of the transmission fluid has
changed to black or milky, overheating and/or
water contaminate is indicated. The fluid
should be drained and replaced with new
transmission fluid.
The bladder prevents moisture from entering
the hydrostatic pump by expanding and main-
taining pressure. Unless the unit is repaired or
the oil somehow becomes contaminated, this
unit does not require any oil change for the life
of the unit.
6-2.5 Changing Fluid. Change fluid as follows:
1. To drain the hydrostatic transmission, remove
the hex plug on the bottom of the hydrostatic
transmission.
2. To fill the hydrostatic transmission, remove the
vent plug located next to reservoir/expansion
tank to prevent an air lock. Fill transmission
through reservoir until fluid overflows from vent
plug, and fill to cold mark on reservoir/expan-
sion tank (fluid capacity 22 ounces).
6-2.6 Hydrostatic Transmission Cooling. The
hydrostatic transmission is cooled by the oil,
fan and fins. Normal operating temperature is
180°F. If the hydrostatic transmission runs hot
check to see if the fan is in operating condition,
the oil level is correct and the fins are clean.
NOTE
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Do not use high pressure water spray or steam
to clean the hydrostatic transmission.
6-2.7 Fluid Conditions. For satisfactory operation,
the following fluid conditions apply:
1. Accurate level readings can be checked only
when the fluid is cold.
2. If the natural color of the fluid has become
black or milky, it is possible that an overheating
or water contaminant problem exists.
3. Proper viscosity is essential. At normal operat-
ing temperatures, the optimum range is
between 80° to 180° SUS (16-40 CS) and it
should never fall below 60 SUS (10 CS).
4. The fluid should be chemically stable, incorpo-
rating rust and oxidation inhibitors.
6-2.8 Recommended Fluids for Models 7 and 11
Pumps. The following fluids are recommended:
1. Mobil Fluid 300
2. Texaco TL-2209
3. Dextron B (General Motors)
4. M2C-33F and M2B-41A (Ford Motor)
5. Hy-Tran (International Harvester)
6. 10W + Straight Viscosity __SE, CC or CD
Rated Engine Oil
**7. 20W + Straight Viscosity __SE, CC or CD
Rated Engine Oil
8. 30W + Straight Viscosity __SE, CC or CD
Rated Engine Oil
**Supplied in M-6 and M-7 assemblies shipped
from factory and preferred for applications
using M-10 or M-11.
6-4
CAUTION