TRANSMISSION
L3301, L3901, L4701, WSM
3-S109
[B] HST Model
Charge Pump
1. Check the charge pump case (3), the inner rotor (2) and the
outer rotor (1) for scratches and wear.
2. If scratch or wear are found, replace the charge pump as an
assembly.
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Pump Shaft and Motor Shaft
1. Check the bearing surface (2), (3), (4), (5) and the oil seal
surface (6).
2. If the shaft (1), (7) is rough or groove, replace it.
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Cylinder Block Bore and Pistons
1. Lift the pistons (2) gently with the retainer plate (1).
2. Check the pistons for their free movement in the cylinder block
bores.
3. If the piston or the cylinder block bore is scored, replace the
cylinder block assembly.
• Do not interchange the pistons between the pump cylinder
block and the motor cylinder block.
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Piston Slipper
1. Check the piston slipper (1) for flatness.
2. If the slipper is rounded, replace the cylinder block assembly.
3. Check the lubricant hole (2) for clogging.
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Cylinder Block Face
1. Check the polished face (1) of cylinder block for scoring.
2. If the polished face (1) is scored, replace the cylinder block
assembly.
3. Check the spring (2) for breakage.
4. If the spring (2) is broken, replace the cylinder block assembly.
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(1) Outer Rotor
(2) Inner Rotor
(3) Charge Pump Case
(4) O-ring
(1) Pump Shaft
(2) Ball Bearing Surface
(3) Needle Bearing Surface
(4) Ball Bearing Surface
(5) Needle Bearing Surface
(6) Oil Seal Surface
(7) Motor Shaft
(1) Retainer Plate
(2) Piston
(3) Cylinder Block
(1) Piston Slipper (2) Lubricant Hole
(1) Polished Face (2) Spring
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