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 |
|---|---|
| Catalogue References | 20/925340; 7029120005 |
| Application | JCB 3CX / 4CX main pump enquiries; PIN and drawing approval required |
| Pump Type | Two-section tandem gear pump, black finish |
| Shaft and Flange | Splined shaft; 2-hole oval flange |
| Port Layout | Four-bolt main port; two capped opposite ports |
| Customisable Items | Shafts, flanges, ports, labels, cartons |
| Packaging | Plugged and capped ports; neutral or private-label carton |
| 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) |
Olive Branch Hydraulics offers this two-section tandem hydraulic gear pump for main hydraulic pump enquiries on JCB 3CX and 4CX backhoe loaders. We quote it against two catalogue references: 20/925340 (also written 20925340 or 20-925340) and 7029120005.
No catalogue number is treated as a guaranteed fit. Before production starts, you approve the machine PIN, splined shaft, mounting flange, port layout and rotation in writing.
We make every unit in Hebei, China, to original-equipment quality (原厂原装品质) and match it to the confirmed drawing. Enquiries filed as bomba hidráulica 20/925340, pompe hydraulique 20925340 or гидронасос 20/925340 go through the same drawing check.
Supply basis: EXW Hebei, China.
Order types: wholesale and bulk lots, OEM/ODM builds to drawing, private-label units and small-batch trial orders.
Documents: only documents produced and verified for your specific order.
The pictured unit is a black two-section tandem pump. Both gear sections are driven from one splined input shaft.
Tandem layout: front and rear gear sections in line on a common drive, with the circuit arrangement confirmed against your drawing.
Splined drive shaft: spline profile and shaft length are machined to the approved drawing. A shaft mismatch can prevent correct coupling engagement.
2-hole oval mounting flange: bolt centres and pilot are checked against the drawing before the flange is released for assembly.
Four-bolt main port: shipped sealed with a black shipping plug, so the inlet stays closed until installation.
Two capped opposite ports: the side ports are closed with caps for transit and storage.
Rotation direction is fixed at assembly, so we confirm it before the gear sections are built.
Materials and any inspection records required must be confirmed for the order.
For OEM/ODM orders where the machine build differs from the catalogue reference, we can make custom shafts, flanges and ports.
Every order is inspected before shipment. Available inspection records and check points are agreed on the quotation.
The part number alone does not decide fit. Six interfaces do.
| Check Point | What We Confirm | What to Send |
|---|---|---|
| Catalogue reference | 20/925340 or 7029120005 on the existing pump or parts list | Nameplate photo or parts-book page |
| Machine PIN | Model (3CX or 4CX) and hydraulic build variant | Full PIN from the chassis plate |
| Drive shaft | Spline profile, tooth count, shaft length | Drawing or measured sample |
| Mounting flange | 2-hole oval pattern, pilot, bolt centres | Dimensioned drawing |
| Ports | Four-bolt main port, side port type and positions | Drawing or photos of the existing pump |
| Rotation | Clockwise or anticlockwise, viewed from the shaft end | Arrow marking or drawing note |
We take displacement, pressure and flow figures for each section from your drawing or the original pump data. We do not quote them from a generic table.
Sometimes the PIN shows a different hydraulic build from the catalogue reference. In that case we quote against the drawing that matches that machine.
Every commitment below can be checked on your order. Anything not listed here is stated on the quotation.
We manufacture hydraulic gear pumps in Hebei, China, and build OEM/ODM orders to your drawing or sample.
Your drawing or sample is matched and approved before an order goes into production.
Every order is inspected before shipment, and every document we issue is specific to that order.
Small-batch trial orders are accepted before volume orders.
| Buyer | What We Supply | Stated on Quotation |
|---|---|---|
| Wholesale / distributors | Quantity-tiered pricing, neutral cartons | MOQ, price tiers, carton size and weight |
| Regional dealers | Resale price structure for the 20/925340 line | Territory terms, discussed on request |
| OEM/ODM | Custom shafts, flanges and ports built to your drawing | Sample cost, tooling if needed, lead time |
| Private label | Your logo on labels and cartons | Artwork approval, MOQ |
| Trial orders / start-ups | Small batch before volume | Sample cost, lead time |
| Fleet and project users | Pump matched to each machine PIN | Batch split, delivery schedule |
Pumps ship with the main port plugged and the side ports capped, in neutral or private-label cartons. Prices are EXW Hebei, and each quotation states the MOQ, lead time, carton specification and payment terms.
No. Fit is confirmed by the machine PIN and by your written approval of the shaft, flange, ports and rotation.
Only 20/925340 and 7029120005. The spellings 20925340 and 20-925340 refer to the same reference.
Send the machine PIN, catalogue reference, quantity, and a drawing or clear photos of the shaft, flange and ports. For private-label orders, also add the destination market and your label requirements.
Yes. We build custom shafts, flanges and ports to an approved drawing, and the quotation shows the cost and timing.
Both are set on each quotation. They depend on quantity, the level of customisation and whether a sample is needed first.
Yes. The quotation states the sample cost and lead time, and small-batch trial orders are accepted before bulk orders.
Yes. We supply neutral or private-label cartons and labels, and you approve the artwork before packing.
Only documents produced for your order, such as the commercial invoice, packing list and pre-shipment inspection record. We do not issue certificates or test reports that were not produced for your order.
Send us the machine PIN, the catalogue reference (20/925340 or 7029120005), the quantity, a drawing or shaft, flange and port photos, and your destination market. We will reply with an EXW Hebei quotation that states the MOQ, sample cost and lead time, plus a drawing-confirmation sheet for this tandem pump.
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