TYM T303HST, Workshop Manual

Page: 97 / 249

3. Remove the seal and washer.
4.Remove the retaining ring from the shaft.
Remove thrust washers and thrust bearing.
5. Inspect the shaft for damage in the
bearing and spline area.
6. Inspect the thrust bearing and washers for
wear.
3. Remove the seal and washer.
4.Remove the retaining ring from the shaft.
Remove thrust washers and thrust bearing.
5. Inspect the shaft for damage in the
bearing and spline area.
6. Inspect the thrust bearing and washers for
wear.
Hydrostatic Motor Inspection
1.Inspect the needle bearings in the back
plate and the motor housing.If the needles
remain in the cage and spin freely,there is
no need to replace them.
3. Inspect the bronze side of the valve plate
for ear,Replace the valve plate if any
wear,scoring,or scratches exist.
4.Inspect the piston block surface that
makes contact with the valve plate. This
surface should be smooth and free of deep
scratches.
5.Check the piston movement in the piston
block bore.If the pistons are sticky in the
bores examine the bores for scoring or
contamination.
6. Remove the pistons and spider assembly.
Piston shoe
Piston
Piston block
Spider
no need to replace them.
2.If the needle bearing in the motor housing
needs to be replaced, it can be pressed out
with the appropriate size bearing driver.If
the bearing in the back plate must be
replaced it must be pulled out with a slide
hammer or blind hole puller.
IMPORTANT: When removing bearing
from back plate,be extremely careful
to not damage machined surfaces.
6. Remove the pistons and spider assembly.
7.Examine the outside of the pistons for
finish condition.They should not show
wear or deep scratches.
8.inspect the piston shoes for a snug fit on
the ball end of the pistons.Check the face
of the shoes for a flat smooth surface.
9.Examine the spider for wear in the pivot
area.
10.Examine the pivot to ensure smoothness
and no signs of wear.
4-34
Wear Surface
Cam washer