Bosch Rexroth A10VG closed-circuit hydraulic pump for the John Deere mowers EPC202595 AZ61789
- Product Details
- Product Model
- FAQ
The A10VG is a variable-displacement axial piston pump from Bosch Rexroth, designed specifically for closed-circuit hydrostatic transmissions. It uses a swashplate design: pistons ride in a rotating cylinder block, and tilting the swashplate changes the stroke and therefore the flow and direction of oil.
That single feature, reversing flow by moving the swashplate through center, is what lets a mower go forward, stop, and reverse smoothly without a mechanical gearbox.
Key Design Features
Integrated charge (boost) pump. Keeps the low-pressure side of the loop topped up and cooled.
High-pressure relief valves with integrated make-up (boost) check valves. Protect the loop from spikes and replenish oil.
Multiple control options. Common types include hydraulic (HD), electro-proportional (EP), and mechanical servo (HW) controls, depending on the series and application.
Through-drive options. Many versions allow a second pump to be mounted on the back, which is useful for powering implement or deck hydraulics.
Wide size range. The family spans compact displacements (roughly 18 cc/rev) up to large units around 140 cc/rev, depending on the series.
Why Closed-Circuit Pumps Suit Mowers
Open vs. Closed Circuit in Plain English
In an open circuit, oil returns to a tank after every pass through the system, which works well for loaders and excavators. In a closed circuit, oil flows from the pump to the wheel motor and straight back to the pump, in a continuous loop.
For mowers, that matters for three reasons:
1. Precise speed control. The operator's pedal or lever directly meters pump displacement.
2. Dynamic braking. Letting off the pedal restricts flow, and the hydrostatic loop itself slows the machine.
3. Compact packaging. Less plumbing and a smaller reservoir than an open system of the same capability.
Where the A10VG Fits Among John Deere Mowers
Here is the honest answer many articles skip: not every John Deere mower uses a Rexroth pump. Residential and light-commercial zero-turns commonly use self-contained units from suppliers like Hydro-Gear or Tuff Torq. Larger turf and commercial machines, and many hydrostatic drive packages in the wider equipment world, are where axial piston pumps like the A10VG appear.
Because suppliers change across model years, treat any "this pump fits that mower" claim with caution until you've verified:
The machine model and serial number
The John Deere part number (and any supersession)
The Rexroth model code stamped on the pump nameplate
Shaft type, mounting flange, port configuration, and control type
If the nameplate reads A10VG, you can decode it. Rexroth's type code identifies the size, control, series, rotation direction, and options.
Symptoms of a Failing A10VG
1. Machine Creeps in Neutral
Often a control or neutral-adjustment issue rather than a worn pump. Check linkage and control calibration first.
2. Slow or Weak Drive, Especially When Hot
Internal wear lets oil slip past the pistons and valve plate, a loss of volumetric efficiency. Performance drops as oil thins out with heat.
3. Whining or Cavitation Noise
Usually points to a restricted inlet, low charge flow, aerated oil, or a clogged filter. Don't ignore it: cavitation destroys pumps quickly.
4. Overheating
Check the cooler, oil level, and charge pressure. A pump that runs hot may be working hard to compensate for internal leakage.
5. Metal in the Oil or Filter
Dark, glittery fluid or debris on the filter means internal wear. At that point, the wheel motors and the rest of the loop may be contaminated too.
For more brands and equipment models, please visit https://www.baolilaihydraulic.com/brand/
| Application equipment brands | Application equipment No. |
| John Deere | EPC202595 |
| John Deere | AZ61789 |
Q1: What causes an A10VG to lose power?
A1: Common causes include internal wear, low charge pressure, contaminated or overheated oil, and failing relief valves.
Q2: Where do I find the model code?
A2: On the pump nameplate. Take a clear photo before ordering.
Q3: What is the price and delivery time of the A10VG hydraulic pump for the John Deere mowers?
A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.
Q4: How do I purchase an A10VG hydraulic pump for the John Deere mowers?
A4: Visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.
