_Hydraulic Units for Travelling Machinery.
_Variable axial piston pump of swashplate design for mobile concrete mixers, closed circuit transmission.
_Flow is proportional to drive speed and displacement and is infinitely variable Adjust the angle of swashplate to realize the stepless variable Flow direction changes smoothly when the swashplate is moved through the neutral position
Two pressure-relief valves are provided on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overload.
Auxiliary pump as the function of boosting pump & controlling oil pump
The maximum boost pressure is limited by a built-in boost pressure- relief valve
_40MPa; Nominal pressure 40MPa
_Long service life, high-precision bearings
_Parker; Parker seals
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Variable pump, swashplate design, mobile concrete mixers

A4VT

Operation mode

Pump, closed circuit

G

Size

--Displacement Vg max(ml/r)

56

71

90

Control device[1-available 2- on request — not available; ]

Hydraulic control / mechanical servo		2	1	1	HW
Proportional control, Electric with emergency actuation and spring return	12V	2	1	1	EP1
	24V	2	1	1	EP2

Mechanical stroke limiter

Without Mechanical stroke limiter [no short code]
With Mechanical stroke limiter	M

With ports X3, X4 for stroking chamber pressure

Without ports X3, X4[no short code]
With ports X3, X4	T

Series

3

Short code

2

Direction of rotation

Viewed from shaft end	clockwise	R
	counterclockwise	L

Seals

NBR (nitrile-caoutchouc), shaft seal in FKM (fluor-caoutchouc)	N
FPM (Fluorocarbon rubber to DIN ISO 1629)	V

Shaft end

Splined shaftSAE	Without coupling flange	S
	With coupling flange	L

Mounting flange 56 71 90

SAE 2 hole	1	—	—	C
SAE 4 hole	—	1	1	D

Working fluid port

A and B on same side [Metric, mounted by bolts. / connected by flange]

10

Auxiliary pump & Through drive

Auxiliary pump	Mounting flange	hub
1	—	—	F00
1	SAE A / 2 hole	SAE A [N5/8” — 9T 16/32DP]	F01
1	SAE B / 2 hole	SAE B [N7/8” — 13T 16/32DP]	F02

Valves

With high-pressure pilot relief valve, with by pass system	—	1	1	1
With high-pressure relief valve, direct operated, with by pass system	2	—	—	5

Filtration, boost circuit

Filtration in suction line of boost pump

S

Rotational speed sensor

withoutrotational speed sensor [no short code]
With rotational speed sensor	G