A10VG and A11VG Series Closed Circuit Rotary Groups
A10VG and A11VG closed circuit rotary groups and spare parts in sizes 18 to 63 and 35 to 50 for compact hydrostatic drive circuits.
Product Overview
A10VG and A11VG are the compact closed circuit pumps used on small self propelled machines: rollers, small pavers, sweepers and platform vehicles. They are physically small but the charge pump, control and rotary group all have to work together, so a repair needs the right parts rather than the nearest match. We build rotary groups and single parts for A10VG sizes 18 to 63 and A11VG sizes 35 and 50.
| A10VG | 18 28 45 63 |
|---|---|
| A11VG | 35 50 |
Key Benefits
- Supplied as a matched set so the block, shoes and valve plate run in together
- Same envelope and spline as the original, so the pump goes back on the machine unchanged
- Available for frames the original maker has moved off its list
- Twelve month warranty on the same terms as a new original part
Application Scenarios
- Small rollers and compaction equipment
- Sweepers and municipal vehicles with hydrostatic drive
- Access platforms and self propelled work platforms
- Compact agricultural machines
Who It Is For
- Pump rebuild shops working to a customer deadline
- Plant and fleet maintenance teams
- Distributors carrying rotary group stock for local machines
- Machine builders needing a second source
Problems It Solves
- The machine creeps when the drive lever is at neutral
- Drive is weak in one direction only
- The charge circuit no longer holds pressure
- Parts for these compact frames are hard to source locally
Technical Features
- Cylinder block with sintered bronze running face bonded and machined after sintering
- Piston and shoe assemblies swaged and checked for shoe clearance
- Valve plate lapped to a mirror finish so the pair seals under pressure
- Retainer plate and ball guide matched to the block
- Splines and bearing seats ground after heat treatment
Specifications
Performance figures depend on the exact variant, so we confirm them against your model code rather than publishing a number that may not apply to your pump.
| Set contents | Cylinder block, pistons with shoes, retainer plate, ball guide, valve plate and spring set |
|---|---|
| Matching | Parts lapped and matched as one running set |
| Spline | To the original pattern, checked over pins |
| Marking | Neutral or your own part number on request |
| Packing | Oiled and vacuum sealed, boxed per set |
| Performance data | Confirmed against the full model code on your unit before quotation |
Materials
| Cylinder blocks | Case hardening steel with a sintered bronze running face, bonded and machined after sintering |
|---|---|
| Pistons and shoes | Case hardening steel with a bronze shoe face, swaged and hydrostatically balanced |
| Valve plates | Bearing steel or bronze faced steel depending on the frame, lapped to a mirror finish |
| Drive shafts | Alloy steel, carburised and hardened on the spline and bearing seats, ground on centres |
| Vanes and rotors | High speed tool steel and case hardening steel, hardened and ground on all working faces |
| Cam rings | Bearing quality alloy steel, through hardened then profile ground |
| Seals | Nitrile as standard, fluorocarbon or polyurethane on request for hot or fire resistant fluid duty |
Manufacturing Process
- Turning and millingBlanks are turned and milled from certified bar and forging stock on CNC machines.
- Heat treatmentCarburising, quenching, tempering or nitriding to the route the original part uses.
- GrindingBores, spline seats and running faces are ground after heat treatment so distortion is removed.
- Lapping and superfinishingValve plates, shoe faces and block faces are lapped so the pair seals under pressure.
- InspectionDimensions, hardness and surface finish are recorded against the drawing on a sampling plan.
- Assembly and testComplete pumps are built, run in and tested for efficiency, leakage and noise before packing.
Quality Control
- Incoming material certificates are checked against the grade called for on the drawing.
- Hardness is measured after heat treatment on every batch and recorded on the batch card.
- Critical bores and running faces are gauged against the drawing tolerance, not against a sample part.
- Mating parts are matched as a set so the block, shoes and valve plate run in together.
- Rebuilt pumps are bench tested for volumetric efficiency, external leakage and sound level.
- Parts are cleaned, oiled and vacuum sealed so they arrive without surface rust.
Certifications and Documentation
Supplied on request with an order. We do not claim approvals we cannot evidence.
| Material certificate | Mill certificate for the steel grade used in the batch |
|---|---|
| Hardness report | Surface and core hardness readings after heat treatment |
| Dimensional report | Measured values for the critical features named on the drawing |
| Test bench report | Flow, efficiency, leakage and sound readings for a rebuilt pump |
| Packing list and photographs | Carton contents and photographs of the packed goods before shipment |
Customization Options
- Shaft and splineKeyed, straight or splined shaft ends built to your sample or drawing.
- Port and mountingFlange, thread and mounting pattern matched to the pump already on the machine.
- Seal materialNitrile, fluorocarbon or polyurethane for hot oil, fire resistant fluid or low temperature duty.
- Rotation and displacementLeft or right hand rotation and the displacement code your circuit was set up for.
- Marking and packingNeutral packing, your own carton artwork and your own part number laser marked on the part.
Comparison With Other Products
| Point | A10VG | A11VG | A4VG |
|---|---|---|---|
| Frame | Compact | Compact | Medium to large |
| Sizes we build | 18 to 63 | 35 and 50 | 28 to 500 |
| Typical machine | Roller and sweeper | Small self propelled machine | Loader and paver |
| Circuit | Closed with charge pump | Closed with charge pump | Closed with charge pump |
Use Guide
- Record the full model code and the serial plate before stripping the unit.
- Measure the housing bore and bearing seats. A worn housing will kill a new rotary group.
- Fit the set complete rather than mixing new and used running faces.
- Renew the seal kit and the shaft bearing at the same time.
- Flush the circuit, prime the case with clean oil and run in at low pressure.
Product Photographs
Related Products
A4VSO Series Rotary Groups
A4VSO and A4V rotary groups and spare parts in sizes 28 to 500, supplied as matched sets with cylinder block pistons valve plate and swash plate.
View Series and Sizes
A4VG Series Rotary Groups
A4VG closed circuit rotary groups and spare parts in sizes 28 to 500 for self propelled machine drive circuits, supplied as matched sets.
View Series and Sizes
A7VO and A8VO Series Rotary Groups
A7V A7VO and A8VO bent axis rotary groups and spare parts in sizes 28 to 1000 for excavator and heavy mobile main pumps.
View Series and Sizes
Related Industry Applications
Construction Machinery
See the ApplicationMining and Quarry
See the ApplicationMarine and Offshore
See the Application
Related Project Cases
Excavator Travel Motor Rebuild Programme in Turkey
Read the CaseStocking Cartridge Kit Programme for a German Distributor
Read the CaseMarine Winch Pump Refit for a Canadian Repair Yard
Read the Case
Related Articles
Frequently Asked Questions
Why does the machine creep at neutral?
Usually a worn control or a swash plate that is not returning to centre. Check the neutral adjustment before condemning the rotary group.
Do you supply the charge pump?
Charge pump parts are available for the common variants. Give us the full model code.
Is drive weak in one direction a rotary group problem?
Not always. Check the relief valves on each side of the loop first, then the rotary group.
Are A10VG and A11VG parts interchangeable?
No. They are separate families with their own parts.
How quickly can these ship?
The common sizes are held in stock. Ask on WhatsApp for a stock check before ordering.
Send Us the Model Code and We Will Quote
Tell us the model code stamped on the pump, the quantity and your delivery port. A quotation with lead time usually comes back within one working day.