20/903300 Tandem Gear Pump With Four-Bolt Flange

The 20/903300 tandem gear pump is also listed as 20903300 or 20-903300. It mounts through a square four-bolt flange and is driven by a splined shaft. The four threaded holes around its large main inlet are port holes, not mounting holes. Olive Branch Hydraulics supplies this two-section unit for JCB 4CX hydraulic pump enquiries, including 4CX444 and 4CXSM444 builds. We confirm the machine PIN and hydraulic build before we confirm fitment.

Identify the 20/903300 Four-Bolt Configuration

The pictured unit has a black two-section tandem body. Both gear sections run on one drive line, and a rear cover held by hex bolts closes the body. One large main inlet sits on one face, with four threaded holes around it for the inlet connection. Two capped outlets sit on the opposite face, one for each section, so each section typically feeds its own circuit on the loader. Each unit is supplied with original-equipment quality (原厂原装品质) and is checked against the confirmed interface drawing, not a catalogue description.

Square four-hole or oval two-hole flange: count the holes on the mounting flange at the shaft end and nowhere else. A square four-bolt flange has four through-holes at the corners of the plate around the shaft pilot. An oval two-bolt flange has two holes on its long axis. The four tapped holes around the inlet belong to the port and say nothing about how the pump mounts. If the removed pump has two mounting holes, send its photos for a separate configuration check before ordering this four-hole version.

Mounting and Port Checks

Check the following interfaces against the removed pump or the approved drawing.

Mounting flange: four through-holes in a square pattern. Measure the hole pitch and the pilot diameter.

Splined shaft: count the teeth and measure the outside diameter, or send an end-on photo with a ruler in frame.

Main inlet: one large inlet with four threaded holes. Note the thread size of those holes.

Two outlets: on the face opposite the inlet. Measure each one separately, because the two sections may not share a port size.

Rear cover: hex-bolted. Record any extra ports or plugs on the old unit.

Reference Numbers and Machine Build

Buyers often send 7029121029 and 7029121035 together with 20/903300. We treat both numbers as enquiry references only. A matching number does not prove fitment: pumps from the same body family can differ in spline, outlet ports or flange from one machine build to another. We confirm a reference only after checking the machine PIN against an interface drawing or measurements from the old pump. On JCB 4CX, 4CX444 and 4CXSM444 machines, the hydraulic build recorded for the PIN decides which configuration applies.

Equivalent search terms: bomba de engranajes tándem (ES), pompe à engrenages tandem (FR), тандемный шестерённый насос (RU).

Order Specification

All quotations are EXW Hebei, China. We accept small-batch trial orders. Shafts, flanges, ports, labels and cartons can be made to an approved drawing or sample. Each quotation states the MOQ, quantity price breaks, carton packing and lead time for the confirmed configuration, since these vary by build. Every order goes through pre-shipment inspection against the approved drawing before it is released.

FAQ

How many mounting holes does the 20/903300 flange have?

Four, in a square pattern around the shaft pilot. A pump with two holes on an oval flange is a different configuration.

Do the four holes around the inlet mean it is a four-bolt flange?

No. Those four threaded holes secure the inlet connection. Count the mounting holes only on the flange plate at the shaft end.

Which spline does the shaft use?

That depends on the build, so we confirm it per order. We check the tooth count and outside diameter against your old pump or interface drawing before quoting.

Are both outlet ports the same size?

We don't assume they are. We confirm each outlet's size and thread form separately against the drawing or the removed pump.

Do 7029121029 and 7029121035 cross-reference to 20/903300?

Only after we have checked them. We treat both as enquiry references until the machine PIN and the interface drawing or measurements confirm the match.

What terms apply to an RFQ?

EXW Hebei, China. Send the PIN, quantity and pump photos. The quotation will state the MOQ, lead time and payment terms.

Request Matching

Send the machine PIN, the order quantity and clear photos of the mounting flange, shaft end, main inlet, both outlets and nameplate. We will reply with a configuration match against 20/903300 and an EXW Hebei quotation, and we can arrange a small trial batch before your first full order.