1. Main Pump(TOSHIBA)

S170LC-V,S170W-V

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Technical Information on PVC8080 Pumps (Toshiba)

I GeneralCombination Piston Pump PVC8080RINS***-**-YPD***-***, which is composed of swash plate

type variable piston pump installed in parallel and gear pump is to be explained on its structure,

operating principle,

II ConstitutionCombined Parallel by gears

Gear pump is mounted on main pump through coupling

Main pump – main body, control, TVC valve

Gear pump is classified as SGP and YPD

III Structure and Operating Principle

1. Structure

1.1 Parallel swash plate variable piston pump (PVC8080RINS***)

Main Body

Rotary group, shaft(1),(28), cylinder(14), piston ass’y(10)

Gear(12)

Swash plate group, housing(2), cradle(6),(7)

Cover group cover(37), spring(23), port plate(15),(34), power

piston(67), rod PW(63), piston RE(78), rod RE(77)

Control rod(54), spring(53), ring(86), spring1(51),

spring2(50)

TVC valve relief valve(100), linear solenoid(90), spool(93)

1.2 Fixed Gear Pump(SGP**, YPD***-***)

Combination Piston Pump PVC8080RINS***-**-YPD***-***, which is composed of swash plate

type variable piston pump installed in parallel and gear pump is to be explained

2. Operating Principle

2.1 Piston Pump

2.2 Gear Pump

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3. PVC Series Control Function

3.1 Control Function

Power control

Negative Flow Control

Power Shift Control (by EPPR valve)

3.2 Operating Principle of Control

3.3 Basic Principle of Control

(1) Power Control (by self discharge pressure)

Refer to Figure 3 and Figure 4.

Primary pressure Pd is applied to the hatched area (piston RE room).

(2) Summation Power Control

(3) Negative Flow Control

(4) Power Shift Control

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4

5

6

7

8

9

10

Adjustment of main pump

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