Servicing; Hydrostatic Transmission - Kubota BX24 Workshop Manual

BX24, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM

[4] SERVICING

(1) Hydrostatic Transmission

Center Section
1. Check the center section surface (1) for scratches or wear.
2. If deep scratch or excessive wear is found, replace the
hydrostatic transmission assembly.
(1) Center Section Surface
Charge Relief Valve
1. Check the charge relief cone (1) and the spring (2).
2. If defects are found, replace it.
(1) Charge Relief Valve
(2) Spring
Check and High Pressure Relief Valve
1. Check the check and high pressure relief valve (5), (6) for
scratches and damage.
2. Check the spring (3) for breakage and wear.
3. If anything are unusual, replace the check and high pressure
relief valve as complete assembly.

NOTE
• Check and high pressure relief valve (reverse) has a pin hole
(1.5 mm, 0.059 in.).
(1) Plug
(2) O-ring
(3) Spring
Cylinder Block Assembly
1. Check the cylinder blocks (1) and the pistons (2) for scratches
and wear.
2. If there are scratch or worn, replace the cylinder block assembly.
3. Check the pistons for their free movement in the cylinder block
bores.
4. If the piston or the cylinder block is scored, replace the cylinder
block assembly.
5. Check the polished face (4) of the cylinder block for scoring. If it
is scored, replace the cylinder block assembly.

IMPORTANT
• Do not intercharge the pistons between the pump cylinder
block and the motor cylinder block. Pistons and cylinder
blocks are matched.
(1) Cylinder Block
(2) Piston
2-S40
TRANSAXLE
W1093581
(3) Plug
W1093691
(4) Shim
(5) Check and High Pressure Relief
Valve (Forward)
(6) Check and High Pressure Relief
Valve (Reverse)
W1093783
(3) Spring
(4) Polished Face
W1093936
KiSC issued 08, 2019 A