Overview
The ZF 4681.122.001 PRESSURE OIL PUMP is a critical hydraulic component engineered specifically for the BP210 and BP230 series transmissions. This OEM genuine part is responsible for generating the necessary oil pressure to lubricate gears, actuate clutches, and cool internal assemblies during operation. Mounted directly within the main gearcase, the pump draws fluid from the sump and delivers it under pressure to the valve body and torque converter circuit. The SKU 4681.122.001 is precision-machined to maintain tight clearances, ensuring consistent volumetric efficiency across all load ranges. Without a properly functioning pressure oil pump, the entire transmission system cannot maintain hydraulic command, leading to immediate operational degradation.
Symptoms of Failure
- Delayed or harsh gear engagement: When the pump loses prime or internal gears wear, hydraulic pressure drops, causing noticeable lag when shifting from neutral to drive or reverse.
- Low transmission oil pressure warning: A failing 4681.122.001 often triggers dashboard alerts or gauge readings below 80 PSI at idle, indicating insufficient flow to critical circuits.
- Intermittent gear slipping under load: Worn pump rotors cannot sustain pressure during heavy acceleration, allowing clutches to slip momentarily before re-engaging.
- Audible whining or grinding noise: Cavitation or metal-to-metal contact inside the pump housing produces a high-pitched sound that intensifies with engine RPM.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4681.122.001 |
| Pump Type | Gerotor / Internal Gear |
| Housing Material | High-Grade Aluminum Alloy |
| Rotor Material | Sintered Steel with Moly Coating |
| Overall Length | 185 mm |
| Overall Width | 95 mm |
| Height (including flange) | 110 mm |
| Dry Weight | 2.4 kg |
| Max Operating Pressure | 22 bar (320 psi) |
| Flow Rate at 2000 RPM | 18 L/min |
| Seal Type | Viton O-Ring |
Compatibility
This pressure oil pump is factory-specified for the ZF BP210 and BP230 series transmissions. It also fits the WG180 and WG200 series when used in medium-duty truck and bus applications. The 4681.122.001 is interchangeable with earlier pump variants in the BP200 family, provided the drive tang geometry matches. Always verify the pump cavity depth in your specific housing before installation. The pump interfaces directly with the TRANSMISSION HOUSING and is secured between the HOUS.FRONT SECT and the HOUSING REAR PART. The entire pump assembly is enclosed within the CASE which provides structural support and fluid routing channels.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4681101002 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating assemblies |
| 4681201007 | HOUS.FRONT SECT | Forward section that supports the pump and input shaft |
| 4681201008 | HOUSING REAR PART | Rear section that houses the output shaft and governor |
| 4681298001 | CASE | Complete enclosure assembly for the gear train |
| 0631306074 | CYLINDRICAL PIN | Alignment dowel for precise housing registration |
| 0636100801 | CAP SCREW | M10 fastener for securing pump to housing |
| 4681301015 | FIXING PLATE | Retainer plate that prevents pump rotation |
| 4681301016 | SCREEN SHEET | Fine mesh filter for pump inlet protection |
| 4681301017 | SCREEN SHEET | Coarse mesh pre-filter for large debris |
| 0636100803 | CAP SCREW | M8 fastener for fixing plate attachment |
Frequently Asked Questions
Q: Can the 4681.122.001 pump be rebuilt with a seal kit?
A: While the gerotor set is replaceable, ZF recommends installing a new OEM pump assembly to ensure proper rotor clearance and housing integrity. Rebuilt units often fail prematurely due to bore wear.
Q: What torque specification should I use when installing this pump?
A: Tighten the cap screws (part 0636100801) to 45 Nm using a cross-torque pattern. Over-torquing can distort the aluminum housing and cause internal binding.
Q: Does this pump require priming before first startup?
A: Yes. Fill the pump cavity with clean ATF through the pressure port and rotate the drive gear by hand until fluid exits the outlet. Dry starts can damage the rotor coating within seconds.
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ZF 4681.122.001 PRESSURE OIL PUMP – Oil Pump RFQ Support
PartsZF helps B2B buyers source ZF 4681.122.001 PRESSURE OIL PUMP with fast RFQ support, expert part-number lookup, documentation review, and export coordination. This oil pump page is built from confirmed catalog, media, and reference data to reduce sourcing uncertainty for construction machinery transmission parts.
Part-Number Summary
Use ZF number 4681.122.001 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Documentation reference: 4681054011
- Documentation reference: 4681054012
- Documentation reference: 4681054013
- Documentation reference: 4681054018
- Illustration section: BP 210
- Illustration section: BP 230
- Illustration section: PRESSURE OIL PUMP
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4681.122.001 |
|---|---|
| Normalized SKU | 4681122001 |
| Part name | PRESSURE OIL PUMP |
| Product category | oil pump |
| Cross-reference support | Available for RFQ review |
Image and Documentation Notes
Current product media status: diagram. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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