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2. Hydrostatic Transmission Inspection
1.Inspect the bronze side of the valve plate for wear
Replace the valve plate if any wear, scoring or
scratched exist.
2. Inspect the cylinder block surface that makes
contact with valve plate. This surface should be
smooth and free of deep scratches.
3. Check the piston movement in the bore. If the
pistons are sticky in the bore, examine the bore
for scoring of contamination.
4. Inspect the outside of the pistons. Replace if
scored of worn.
5. Inspect the shoes. Replace if loosed on the ball
end of piston or if shoe face area is worn or
damaged.
6. Inspect the retainer. Replace if worn in the
area
where it contacts the retainer.
7. Inspect the spherical bush. Replace if worn or
damaged.
8. Inspect the spring. Replace if necessary.
Note : The inspection method for rotary parts of
pump and motor is same.
10. Inspect oil seal of interior seal cover. Replace
worn or damaged parts as required, if necessary.
11. Inspect the shaft of motor for damage on the
bearing surfaces or in the splined areas.
12. Inspect needle bearings, ball bearing and oil
seal in the body. Replace them if necessary.
If the bearing was removed from the body,
new one can be pressed. Be sure that the
numbers on the bearing race are facing to the
outside of the body. Also, replacement of oil
seal is same procedure.
9. Inspect the shaft of pump for damage on the
bearing surfaces or in the splined areas.
Shaft(Pump)
Cylindrical roller bearing
Seal Cover
O-Ring
Seal Cover
O-ring
Oil seal
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