wsm L3301 Workshop Manual page 421

L3301, L3901, L4701, WSM
[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.
(1) Outer Rotor
(2) Inner Rotor
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.
(1) Pump Shaft
(2) Ball Bearing Surface
(3) Needle Bearing Surface
(4) Ball Bearing Surface
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.
IMPORTANT
• Do not interchange the pistons between the pump cylinder
block and the motor cylinder block.
(1) Retainer Plate
(2) Piston
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.
(1) Piston Slipper
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.
(1) Polished Face
3-S109
TRANSMISSION
(3) Charge Pump Case
(4) O-ring
9Y1211012TRS0158US0
(5) Needle Bearing Surface
(6) Oil Seal Surface
(7) Motor Shaft
9Y1211012TRS0159US0
(3) Cylinder Block
9Y1211012TRS0160US0
(2) Lubricant Hole
9Y1211012TRS0161US0
(2) Spring
9Y1211012TRS0162US0
KiSC issued 09, 2016 A