7 Transmission Repair
7D Hydro-Gear 0750 / 0800
7 - 96
Figure D–46. Test For Leaks
Figure D–47. Check Oil Level
If you have the necessary equipment the transmis-
sion manufacturer suggests performing the following
test:
37. Prior to adding oil to the transaxle, it is recommended
that you test for leaks. This may be performed with a
small hand pump or by using compressed air and a
regulator. Do not allow more than 10 PSI to be
applied or seal damage may occur. To locate a leak,
apply a soap mixture around the housing seam and
at all lip seals. Do not submerge unit or the brake will
be damaged.
38.Fill the transaxle with 2-1/2 quarts (80 ounces) of
SAE 20W-50 oil.
39. It is recommended that the unit be purged prior to
installing into the vehicle frame. The following is the
suggested purging procedures for repaired
transaxles.
40. Spin the input shaft in a clockwise direction at 1000-
1500 RPM. This may be performed in a drill press (or
equivalent).
41. Engage (actuate) the bypass valve.
42. Stroke the control lever forward for five seconds and
then reverse for five seconds. Do this three times in
each direction.
43. Return the control lever to neutral.
44. Disengage the bypass.
45. Stroke the control lever forward for five seconds and
then reverse for five seconds. Do this three times in
each direction.
NOTE: It may be necessary to repeat these steps in the
vehicle to fully purge the transaxle. See Sec. 2 Purging
Air from Transaxle.
Check the oil level after fully purging the unit of air. It
should be between 1” and 1.25” from the top of the hous-
ing.
After installing the transaxle, make sure all linkages and
actuators are functioning properly.
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