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A7V SERIES · AXIAL PISTON PUMP JA7V Bent-Axis Variable Displacement Pump Variable displacement axial piston pump in bent-axis design, for hydrostatic transmissions in open circuits. Ten displacements …

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Product Introduction

A7V SERIES · AXIAL PISTON PUMP

JA7V Bent-Axis Variable Displacement Pump

Variable displacement axial piston pump in bent-axis design, for hydrostatic transmissions in open circuits. Ten displacements from 20.5 to 160 ml/r, four control types, and a spherical port plate that self-centres under load — engineered for pile drivers, tunnel borers, cranes and other heavy-duty mobile machinery.

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Open circuit
20.5 – 160 ml/r
Up to 4750 rpm
35 MPa continuous

JA7V bent-axis variable displacement axial piston pump

Displacement sizes

20.5 to 160 ml/r

Control types

LV / DR / HD / MA / EP

326L/min

Maximum flow

Size 160 at 0.15 MPa inlet

196kW

Maximum power

At Δp = 35 MPa

OVERVIEW

Stepless displacement control for open hydraulic circuits

Flow is proportional to drive speed and displacement, so output volume can be adjusted steplessly at constant input speed. The rotary group uses a proven spherical control area: the cylinder block self-centres against the port plate while running, which keeps peripheral speed low and volumetric efficiency high.

The drive shaft is designed to accept radial loads, so belt drives and gear drives can be connected directly without an intermediate bearing support. Combined with the bent-axis layout and precision-ground pistons, this gives a compact pump with a low noise level and a long service life under continuous industrial duty.

The series covers five frame sizes. Each frame is offered in a 9° and a 16° version, giving two displacements from one housing footprint — a smaller angle for higher speed and finer control resolution, a larger angle for maximum displacement from the same installation envelope.

KEY FEATURES

Why the JA7V

Self-centring spherical port plate

The cylinder block aligns itself against the spherical control area during operation. Low peripheral speed, low leakage, high overall efficiency.

Stepless variable displacement

Flow follows drive speed and swash angle. Displacement is infinitely adjustable at constant input speed, from full stroke down to zero on 9° sizes.

Radial load capacity

The drive shaft supports radial loads, allowing pulleys, gears and couplings to be mounted directly — no extra bearing block required.

Low noise, long life

Nine-piston rotary group with hardened running surfaces and hydrostatic balance — quiet operation and stable performance over long duty cycles.

Five control options

Constant power, constant pressure, hydraulic, manual and electrical control. One pump platform, matched to the way your machine actually works.

OEM-ready configuration

Choice of rotation, shaft end, port connection and stroke limiter, so the pump drops into an existing installation without adapters.

TECHNICAL DATA

Performance at a glance

Values with absolute pressure at suction port S of 0.10 MPa, mineral oil, Δp = 35 MPa. Flow calculated with a volumetric efficiency of 97%.

Size	V_{g max} ml/r	V_{g min} ml/r	n_max r/min	Q_max L/min	P_max kW	Torque at V_{g max} N·m @ 10 MPa	Weight kg
20	20.5	0	4100	82	49	32.6	19
28	28.1	8.1	3000	82	49	44.7	19
40	40.1	0	3400	132	79	63.8	28
55	54.8	15.8	2500	133	80	87.1	28
58	58.5	0	3000	170	102	93.0	44
80	80.0	23.1	2240	174	105	127.2	44
78	78.0	0	2700	204	122	124.0	53
107	107.0	30.8	2000	208	125	170.1	53
117	117.0	0	2360	268	161	186.0	76
160	160.0	46.1	1750	272	164	254.4	76

Sizes 28, 55, 80, 107 and 160 have a minimum displacement above zero. On these sizes the maximum speed can be raised by reducing displacement to V_{g min} while maintaining maximum flow.

CONTROL OPTIONS

Choose how the pump responds to load

Every pump is built with one control type. The code letters below are the ones used in the ordering code.

LVConstant power

Displacement is reduced as pressure rises, holding drive power at a constant level. Standard choice for machines driven by a fixed engine or motor.

DRConstant pressure

Cuts displacement back automatically once the set pressure is reached, keeping system pressure steady with minimal throttling loss.

HDHydraulic

Displacement is set by an external pilot pressure signal, for remote or joystick-controlled machines and multi-actuator circuits.

MAManual

Displacement adjusted by hand at a set screw. Simple, robust and cost-effective for fixed-duty industrial circuits.

Availability note. LV, HD and MA are available on all ten sizes. DR constant pressure is offered on sizes 20, 40, 58, 78 and 117 only. An electrical (EP) control is listed in the ordering code but has no published performance data — please contact us before specifying it.

ORDERING CODE

How to build a model number

Example: JA7V-160-LV-1-L-P-F-0-0

Code	Position	Options
JA7V	Pump type	Bent-axis axial piston variable displacement pump
160	Size	20, 28, 40, 55, 58, 80, 78, 107, 117, 160 ml/r
LV	Control device	LV constant power · DR constant pressure · HD hydraulic · MA manual · EP electrical
1	Series	1 for sizes 20 to 160 · 5.1 for sizes 250 to 500
L	Rotation	R clockwise · L counter-clockwise (viewed from shaft end)
P	Shaft end	P parallel key GB1096-79 · Z splined shaft DIN5480 · S splined shaft GB3478.1-83
F	Port connection	F SAE flange on the side, pressure and suction · G threaded pressure port, SAE flange suction
0	Stroke limiter	0 none · M mechanically adjustable (LV and DR) · H hydraulic (LV only)
0	Auxiliary equipment	0 none

CONSTRUCTION

Inside the pump

Sectional view of the JA7V. Twenty serviceable assemblies, all replaceable from the front cover and the regulator housing.

Sectional cutaway drawing of the JA7V bent-axis pump showing twenty numbered components

1Oil seal

2Front cover

3Drive shaft

4Dishing spring

5Piston assembly

6Center pin

7Limiter screw, minimum flow

8Pilot piston

9Power spring, large

10Power spring, small

11Control rod

12Regulator housing

13Servo piston assembly

14Start-point adjusting spring

15Start-point adjusting screw

16Flow piston

17Limiter screw, maximum flow

18Port plate

19Cylinder block

20Retainer

DIMENSIONS

Installation envelope

Key lengths in millimetres. Full dimensional drawings for each shaft and port variant are available on request.

Size	A1	A2	A3	A4	Weight (kg)
20	251	224	199	107	19
28	260	232	195	107	19
40	317	287	255	123	28
55	327	296	251	123	28
58	374	337	304	152	44
80	385	351	300	152	44
78	381	347	310	145	53
107	393	358	305	145	53
117	443	402	364	214	76
160	454	414	359	213	76

APPLICATIONS

Where the JA7V is used

Pile driving rigs
Tunnel boring machines
Cranes and hoisting
Excavators
Metallurgical equipment
Environmental machinery
Machine tools
Marine hydraulics

Not sure which size fits your machine?

Send us your flow, pressure and speed requirements. We will come back with a model code, a price and a lead time — usually within one working day.

Get a quotation

Specifications are subject to change without notice. Dimensions in millimetres, performance values for mineral oil at 40 °C. For OEM and custom configurations, contact our technical sales team.

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Size	A1	A2	A3	A4	Weight (kg)
20	251	224	199	107	19
28	260	232	195	107	19
40	317	287	255	123	28
55	327	296	251	123	28
58	374	337	304	152	44
80	385	351	300	152	44
78	381	347	310	145	53
107	393	358	305	145	53
117	443	402	364	214	76
160	454	414	359	213	76

Size	A1	A2	A3	A4	Weight (kg)
20	251	224	199	107	19
28	260	232	195	107	19
40	317	287	255	123	28
55	327	296	251	123	28
58	374	337	304	152	44
80	385	351	300	152	44
78	381	347	310	145	53
107	393	358	305	145	53
117	443	402	364	214	76
160	454	414	359	213	76

Size	A1	A2	A3	A4	Weight (kg)
20	251	224	199	107	19
28	260	232	195	107	19
40	317	287	255	123	28
55	327	296	251	123	28
58	374	337	304	152	44
80	385	351	300	152	44
78	381	347	310	145	53
107	393	358	305	145	53
117	443	402	364	214	76
160	454	414	359	213	76