John-deere stx38 User Manual download pdf (Page 273)

3/21/97

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HYDROSTATIC POWER TRAIN

REPAIR

• motor fixed swashplate (G) should be in good

condition, bearing recess machined surface should

not be scored, pitted, discolored, nor worn badly;

• motor fixed swashplate ball bearing and thrust

washers (H, I, and J) should not be scored, pitted,

discolored, missing any balls, or ball retainer

broken;

• motor cylinder block (K), pistons (Q), washers (O),

and springs (P) must have free movement and

should not be scored, pitted, discolored, distorted,

or worn;

•

bronze motor plate (N) and mating surface of

cylinder block (K) should not be grooved,

discolored, or worn thin around ports

;

• center block machined surface (M) should not

scored, pitted, or discolored;

• center block dowel pins (L) should be in good

condition, not missing or sheared off;

• upper case drive shaft ball bearing grooves (S)

should be in good condition, not scored, pitted, or

discolored.

IMPORTANT: If fixed swashplate bearing

components are damaged, they must be

replaced as a set. If bronze motor plate or center

block are damaged, they both must be replaced.

If any component of motor cylinder block is

damaged, a complete new motor cylinder block

must be ordered. If upper or lower case halves

show wear or damage, they need not be ordered

as a set unless wear or damage is severe

enough.

TRANSAXLE ASSEMBLY

IMPORTANT: Coat all components lightly with

fresh oil before assembly, especially any mating

surfaces between components.

Assemble and Install Pump Shaft Assembly—

K-50 Version

K-55 Version

IMPORTANT: Carefully install pump shaft

assembly so case bore is not damaged.

1. Assemble pump (input) shaft and carefully install it

into upper case with snap ring (C).

2. Wrap tape around shaft splines (A) to protect seal.

3. Apply grease to lip surfaces of seal (B) before

installing it flush with case lip.

M58218

M55840

M58213

M55840

M58357

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John-deere stx38 User Manual Page 273

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