Hydrostatic Transmission Motor Disassembly and Assembly (2WD) (continued)
3. Inspect rotating components:
NOTE: Scoring is fine scratches or grooves cut into the highly
machined surface. When the scratches can be detected by feel
using a lead pencil or fingernail, the part must be replaced.
4. Check valve plate and cylinder block for grooves,
scor-ing, discoloration or pitting.
5. Check for free movement of pistons in cylinder bore.
6. Check pistons for flat areas, scoring or discoloration.
7. Thrust bearing (V) must rotate freely. (Fig. 55)
NOTE: Thin thrust plate (X), bushing (W) and motor
case (G) must be replaced as a set. (Fig. 55)
8. Inspect thin thrust washer for wear or damage.
Replace as necessary.
IMPORTANT: Avoid damage! Do not damage ball bearing
(F) when removing seal cap (B).
9. Remove seal cap (B) and snap ring (C) to remove
shaft assembly components.
10. Inspect bushing (W), thrust bearing (V) and shaft (I) for
wear or damage. Replace if necessary. (Fig. 55)
NOTE: Apply silicon sealant to outer edge of new seal
cap. Install seal cap until cap is approximately 4 mm
(5/32 in.) be-low surface of motor case.
11. Assemble parts in reverse order of removal.
NOTE: Use petroleum jelly to hold valve plate in position.
• Put motor valve plate (L) on center valve block. Make
sure bronze surface is away from valve block and notch
in valve plate fits on locating pin of valve block.
IMPORTANT: Avoid damage! Apply clean hydraulic oil
to all mating surfaces.
IMPORTANT: Avoid damage! Pump and motor valve
plates are not interchangeable. The pump valve plate
has two lead-ing grooves into two of the slotted ports.
The motor valve plate (L) has no leading grooves.
NOTE: Motor case will seem springy because the springs
in-side the cylinder block are being compressed.
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