2-S22
ZD18(F) · ZD21(F) · ZD28(F), WSM
TRANSAXLE
6. SERVICING
[1] HYDROSTATIC TRANSMISSION
Center Section
1. Check the surface (1) of center section for scratches or wear. If
deep scratch or excessive wear is found, replace the hydrostatic
transmission assembly.
W1018716
Check and High Pressure Relief Valve
[Serial No. Affected: below 20000]
1. Check the ball (3) for scratches and damage.
2. Check the spring (2) for breakage and wear.
3. If anything unusual, replace the ball and spring.
Check and High Pressure Relief Valve
[Serial No. Affected: above 20001]
1. Check the check and high pressure relief valve assembly (3) for
scratches and damage.
2. Check the spring (2) for breakage and wear.
3. If anything unusual, replace the ball and spring.
W1018786
Cylinder Block Assembly
1. Check the cylinder blocks (1) and pistons (2) for scratches and
wear.
2. If scratch or worn, replace the cylinder block assembly.
3. Check that the piston (2), spring (3) are in each cylinder bore.
4. Check the pistons for their free movement in the cylinder block
bores.
5. If the piston or the cylinder block is scored, replace the cylinder
block assembly.
6. Check the polished face (4) of cylinder block for scoring.
7. If scored, replace the cylinder block assembly.
IMPORTANT
• Do not interchange pistons between pump and motor
cylinder block. Pistons and cylinder blocks are matched.
W1018898
(1) Surface
(1) Plug
(2) Spring
(3) Ball
(1) Plug
(2) Spring
(3) Check and High Pressure Relief
Valve Assembly
(1) Cylinder Block
(2) Piston
(3) Spring
(4) Polished Face
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