How Does A Tandem Gear Pump Work?
Tandem gear pumps deliver independent flow from one shaft. Learn how dual stage gear pumps power complex hydra…
| Parameter | Specification |
|---|---|
| Pump type | Two-section tandem hydraulic gear pump |
| Drive shaft | Splined, profile confirmed from drawing or sample |
| Mounting | 2-hole oval flange |
| Main port | Four-bolt flange port pattern |
| Matching references | 332/F9029; 20/925579; 20/925339; 20/925338; 20/925578; 332/F9028; 7029121120; 7029120047; 7029120023 |
| Fit confirmation | PIN, shaft, flange, ports, rotation approval |
| Customization | Shaft, flange, ports, marking, labels, cartons |
| Trade term | EXW Hebei, China |
| MOQ | Confirmed on quotation |
| Lead time | Confirmed on quotation |
| Brand / quality | Olive Branch Hydraulics / original-equipment quality (原厂原装品质) |
The 332/F9029 hydraulic pump (also searched as 332F9029 or 332-F9029) is a two-section tandem gear pump. It is used for main hydraulic pump enquiries on JCB 3CX and 4CX backhoe loaders. Olive Branch Hydraulics offers original-equipment quality (原厂原装品质) in Hebei, China, and supplies it EXW Hebei after the shaft, flange, port and rotation details are matched against a confirmed drawing.
The same catalogue row also lists 20/925579, 20/925339, 20/925338, 20/925578, 332/F9028, 7029121120, 7029120047 and 7029120023.
These nine numbers help us match your enquiry. They do not mean the parts are interchangeable without checks. Machines from different serial ranges can use different interfaces, so we confirm each order against the machine PIN and the physical interfaces.
Buyers in Spanish-, French- and Russian-speaking markets often search bomba hidráulica 332/F9029, pompe hydraulique 332F9029 or гидронасос 332/F9029. Those enquiries go through the same drawing review.
The catalogue shows four interface features. Each one is checked before machining.
Two-section tandem layout: front and rear gear sections stacked on one drive line. The required circuit arrangement must be checked against the approved drawing.
Splined drive shaft: we confirm spline count, pitch and engagement length from your drawing or sample. A shaft that is slightly off will not engage the drive coupling.
2-hole oval mounting flange: we check the pilot diameter, bolt-hole spacing and flange thickness against the drive pad.
Four-bolt main port: we check the visible four-bolt port pattern, bore, threads and the complete connection layout against your drawing.
Fixed rotation: the required direction is configuration-specific. We confirm the direction from the nameplate, the drawing or the sample before assembly.
Pre-shipment inspection: we check the interface dimensions against the confirmed drawing before dispatch. Test records are supplied only when the order specifies them.
Marking and packaging: you can choose neutral marking or Olive Branch Hydraulics marking. White-label cartons and labels are also available.
Four details decide whether a 332/F9029 tandem pump fits your machine. Section displacement, pressure and flow are quoted only after they are confirmed from your nameplate or drawing.
| Selection point | What to send | What we check |
|---|---|---|
| Machine PIN / serial | Full PIN from the chassis plate | Which catalogue reference applies to that build |
| Drive shaft | Photo, spline count, outer diameter | Spline profile and engagement length |
| Mounting flange | Bolt spacing, pilot diameter | Match with the 2-hole oval drive pad |
| Ports and rotation | Port photos, nameplate, rotation arrow | Four-bolt pattern, thread, direction of rotation |
| Catalogue reference | Common written forms |
|---|---|
| 332/F9029 | 332F9029, 332-F9029 |
| 332/F9028 | 332F9028, 332-F9028 |
| 20/925579 | 20925579, 20-925579 |
| 20/925339, 20/925338, 20/925578 | 20925339, 20925338, 20925578 |
| 7029121120, 7029120047, 7029120023 | Numeric form only |
A matching reference starts the review. The order is released only after the shaft, flange, ports, rotation and PIN are approved.
We manufacture hydraulic gear pumps in Hebei and quote directly from the factory, EXW Hebei. Supply is subject to confirmation of the configuration you require.
Send the PIN, photos or drawing, and the quantity you need.
We return an interface comparison and a quotation for that configuration.
You approve the drawing, including the shaft, flange, ports and rotation.
We produce a small-batch trial or sample, with pre-shipment inspection.
Repeat batches are built to the same approved drawing.
You can customise the shaft spline, flange, port pattern, marking, labels and cartons. Sample cost, MOQ and lead time are quoted for each configuration, because tooling depends on how far your configuration differs from the catalogue version.
| Buyer type | What we quote | What to send |
|---|---|---|
| Wholesaler / distributor | Quantity price tiers, carton size and weight, EXW Hebei | Reference list, annual quantity estimate |
| OEM / ODM | Interface changes, sample cost, batch MOQ | Drawing or 3D file, target quantities |
| Private label / retail / e-commerce | Branded cartons, EAN/UPC labels, small trial batches | Logo files, barcode data, label layout |
| Regional agent | Price tiers by volume, territory terms discussed case by case | Market, current sales volume |
| Project / end user | Split shipments, interface report for each machine | PIN list and fleet quantities |
We supply only documents that have been verified for your order. Available inspection arrangements are confirmed with your quotation.
Not automatically. They share a catalogue row, so we treat them as matching references and confirm fit from the PIN and the interfaces.
The machine PIN, the reference number, the quantity, and photos of the shaft, flange, ports and nameplate. A drawing makes the review faster.
Yes, after the same review. We confirm the shaft, flange, ports and rotation before quoting.
Yes, once they are confirmed from your nameplate or drawing. We do not publish figures for unverified configurations.
Both are quoted for each configuration. A pump that matches the catalogue interfaces usually needs less setup than a modified shaft or flange.
Yes. We accept small-batch trials, and the sample cost is stated in the quotation for your configuration.
We quote EXW Hebei, China. Other Incoterms and payment terms are agreed for each order.
Yes. We offer white-label marking, custom cartons and barcode labels.
Send the PIN, the reference number (for example 332/F9029 or 20/925579), the quantity, the destination market, and photos of the shaft, flange and ports. You will receive an interface check and a factory-direct EXW Hebei quotation covering price, sample cost and lead time for that configuration.
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