Identifying a Power Steering Pump by OEM Number
Why ordering on the truck model produces the wrong pump, and what to read off the unit instead.
Why the truck model is not enough
Our own catalogue carries two MERCEDES BENZ references that differ by four digits: 000 466 6701 and 001 466 2701. It carries two VOLVO references, 1589925 and 364642. It carries three MITSUBISHI FUSO engine variants, 6D14, 6D15 and 6D16, of which the 6D16 takes a different pump from the other two. A truck model distinguishes none of these.
Three numbers, three sources
The OEM number is the vehicle manufacturer's part number — VOLVO, SCANIA, BENZ, MAN, DAF. The manufacturer reference is the number of the company that actually made the pump, usually ZF on European units. The Kerns number is our own stock reference. Any of the three identifies the part; the vehicle model does not.
Reading the ZF casting number
European steering pumps carry a ZF number in the form 7673 955 202. The first group is the series, which tells you the pump family. Several references in our catalogue share the 7673 series — VOLVO, BENZ and DAF units — but they are not interchangeable, because the last group differs. MAN uses the 7685 series, and SCANIA the 7677.
Japanese trucks are identified by engine
ISUZU and MITSUBISHI parts follow the engine, not the cab. ISUZU 10PC1 and 10PB1 take references 447-03940 and 475-03923. MITSUBISHI FUSO 6D14 and 6D15 take MC811879 and 475-03423, while 6D16 takes MC090259 and 475-03479. Find the engine code on the block or the vehicle identification plate before ordering.
Check the hydraulic data, not just the number
Displacement matters. Our SCANIA reference is 32.0 ml/r, roughly double the 17.5 ml/r of the VOLVO and BENZ units. Fitting a lower displacement pump gives heavy steering at low engine speed. Rotation direction matters equally: our DEUTZ FL912-913 gear pump is left-hand rotation and will not build pressure if driven the other way.
Ports and threads
Feed and discharge thread sizes are published for each reference — M26x1.5 feed and M16x1.5 discharge on the VOLVO unit, 20 mm and 15 mm flanged ports on the DEUTZ gear pump. A pump that matches on number but not on port thread needs adapters, which is a leak path nobody wants in a steering circuit.
If the number is unreadable
Corroded castings are common on the vehicles that most often need pumps. Photograph the pump from several angles, note the engine code and the truck make, and send both. Identification can usually be made from the casting shape and the engine series.
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Which pump references do you publish?
Fourteen: VOLVO, SCANIA, MERCEDES BENZ, MAN, DAF and STEYR for European trucks, ISUZU and MITSUBISHI for Japanese trucks, and DEUTZ hydraulic gear pumps.
Do you cover HOWO trucks?
The STEYR reference covers HOWO WG9719 4700 37/2. Confirm the number on your vehicle parts list.
What should I send to get an identification?
A photograph of the pump body showing any visible numbers, plus the engine code. That is usually enough.
Still Not Sure Which Specification You Need
Send the application, the machine or the part number and a recommendation comes back in writing before any order is placed.