5. HYDRAULIC SYSTEM (HST) HST unit
Hydraulic pump : 0 ~ 18.2 cm3 Hydraulic motor : 18.2 cm3 Charge pump : 5.1cm3 Relief valve set pressure : 18.5MPa+2.9MPa Charge pressure : 5.0 kgf/cm2 Pressure check port ( PF3/8 ) Suction port (PF1/2) [charge pump] Discharge port (PF3/8) [charge pump]
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Housing Cover Hanger Input shaft Output shaft Block, cylinder Piston Case, charge pump Relief valve (Low pressure) Relief valve (High pressure) Neutral valve (Backward) Neutral valve (Forward) Drain port Suction port Pressure check port (Forward) Pressure check port (Backward)
E/G
A
B
D
C T/M
C A B C D
B
Pump (Adjustable) Piston Cylinder Flow of oil 9