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PURGING PROCEDURE
Due to the effects air has on the efficiency in hydrostatic
drive applications, it is critical that the air is 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.
1. Lift the rear tires of the mower off of the ground
and chock your front tires so they do no move.
2. With the bypass valve open (To open bypass
valve, loosen ½ to 1 full turn) and the engine
running, slowly move the directional drive arms in
the forward and reverse directions (5 to 6 times),
as air is purged from the unit, the oil level will
drop.
3. With the bypass valve closed and the engine
running, slowly move the directional drive arms in
the forward and reverse directions (5 to 6 times).
Caution: the tires will rotate during this
procedure. Turn off engine. Check the oil level,
and add oil as required after stopping the engine.
4. It may be necessary to repeat steps 1 through 3
until all the air is completely purged from the
system. When the tires move forward and
reverse at normal speed purging is complete.
To adjust the tracking on the mower, lengthen or shorten
the push rods shown in the picture to the right.
Lengthening the push rod will increase the speed of the
pump. Shortening the push rod will decrease the speed of
the pump. On-the-fly adjustments can be made by turning
the adjustment knob in front of either steering arm until
the desired effect is achieved.
Valve Access
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