82
5. Remove the swash plate (4), bush (17), guide assembly (51) as a set from the housing (1).
6. Remove the thrust bearing (13), bush (16), slide metal (18), bearing (54) and pin (53) from the housing (1).
7. Remove the thrust bearing (13) for motor from the housing (1).
8. Remove the shaft as follows:
➀ Remove the four screws (71), cover (19), pin (50) and O-ring (82) from the housing (1).
➁ Remove the snap ring (37) and the shaft (9) from the housing.
9. Remove the trunnion shaft as follows:
➀ Remove the snap ring (69), and tap the shaft end by soft jaw hammer and remove the trunnion shaft (10) from
the housing.
➁ Remove the bearing (66).
10. Disassemble the port block as follows:
➀ Remove the plug (33) for check valve, and remove the spring (21) and poppet from the port block (2).
➁ Remove the valve sub assembly (27).
➂ Remove the plug (74) for neutral valve, and remove the two shims A(79), three shims B(80), spring (75) and
piston assembly from the port block.
(2) Inspection
Replace the parts or HST unit, if clearance is exceeds the service limit.
1. Piston and cylinder block assembly
Replace if the diameter clearance between the
piston and cylinder block exceeds the service limit.
Standard assembly value Service limit
0.02 mm 0.03 mm
2. Charge pump assembly
Measure the side clearance of the trochoid rotor sub
assembly and replace if the service limit is
exceeded.
Standard assembling value Service limit
0.025 – 0.052 mm 0.055 mm
438V
439V
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