John Deere stx38 - Manual (Page 273)

3/21/97
6 - 41
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-50 Version
K-55 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
A
B
C
D
E
T
F
G
H
I J
K
M
N
S
R
O
Q
P
L
M55840
C
B
A
C
M58213
C
A
B
M55840
C
M58357