
10-28
SK714-5 SK815-5 SK815-5 turbo
2.
When HST pump discharges from port PA
1)
Valve at the piston pump delivery side.
When the pressure oil is discharged from port
PA
of the HST pump (4), port
PA
becomes the high pressure side.
This pressure oil at port
PA
flow into port
D
through the groove
b
.
When this happen, sleeve (
3C
) is pushed to
direction, because of the difference in area (
A1
>
A2
). Therefore the
pressure oil from charge pump is prevented from flowing into HST pump.
2)
Valve at piston pump suction side
Port
PB
is at low pressure because port
PB
is suction side.
And sleeve (
3C
) is pushed to
direction to open body seat portion because of the difference in area (
A1
>
A2
).
In this way, the charge pressure oil at port
B
flows into port
PB
through this clearance to charge to the HST circuit..
RKS00130
PA
PB
PA
PB
4
1
RKS00070
3C
b
D
A1
A2
PA
RKS00080
3C
A1
A2
PB
B
STRUCTURE AND FUNCTION
HYDRAULIC PUMP
Содержание SK714-5
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