Bosch A0280743402 – The Unit Pump With Optimised Roller Follower Contact Surface For Extended Component Life

In a unit pump, the roller follower is the component that transfers the motion of the cam lobe to the plunger. The contact between the roller and the cam lobe is a high-stress contact-the stress can exceed 1,200 MPa, and it is repeated with each rotation of the camshaft. The contact surface is subjected to wear, pitting, and scuffing, and the wear reduces the pump's efficiency. The A0280743402 is a Bosch unit pump that is designed with an optimised roller follower contact surface that extends the component life-the roller is made from a bearing steel that is hardened to 62 HRC, and the roller surface is ground to a surface finish of Ra 0.06 µm. The cam lobe is also hardened to 60 HRC, and the lobe is ground to a matching finish. It is the pump that keeps the contact surfaces smooth, so the wear is minimised and the pump's efficiency is maintained.

The roller follower is the component that rides on the cam lobe and pushes the plunger. The contact between the roller and the cam lobe is a high-stress contact that is subjected to repeated cycles of loading and unloading. The stress is concentrated at the point of contact, and it can exceed 1,200 MPa. The contact surface is subjected to wear, pitting, and scuffing, and the wear reduces the pump's efficiency. The A0280743402 addresses this with an optimised roller follower contact surface-the roller is made from a bearing steel that is hardened to 62 HRC, and the roller surface is ground to a surface finish of Ra 0.06 µm. The cam lobe is made from a hardened steel, and it is ground to a matching finish of Ra 0.06 µm.

The A0280743402 is a direct replacement for the original pump used in the 0414799 series, commonly found in:

Volvo Penta – marine and industrial diesel engines

Scania – heavy-duty truck engines

MAN – commercial vehicle engines

DAF – commercial vehicle engines

Iveco – commercial vehicle engines

Mercedes-Benz – OM 400 series engines

MTU – industrial and marine engines

Deutz – industrial engines

Perkins – industrial engines

John Deere – agricultural and industrial engines

Caterpillar – 3100 series engines

Cummins – ISB, ISL, ISX engines

Cross-references include Bosch A0280743402 and the original OEM pump used in the 0414799 series. The pump is designed for the 12 V electrical system used in these engines.

The A0280743402 uses a roller that is made from a bearing steel and hardened to 62 HRC-the high hardness reduces the wear rate. The roller surface is ground to a surface finish of Ra 0.06 µm-the smooth finish reduces the friction and the contact stress. The cam lobe is made from a steel that is hardened to 60 HRC, and it is ground to a matching finish of Ra 0.06 µm. The contact surface condition is verified on each pump using a profilometer-the surface roughness is measured, and the pump is released if the roughness is within the specification.

The most common failure is a pitted roller surface-the roller surface becomes pitted, and the pump makes a tapping noise. The symptom is a loss of power and an increase in noise from the pump. The second most common failure is a worn cam lobe-the lobe wears, and the roller follower does not ride smoothly.

Q1: How can I tell if my roller follower surface is worn? → The pump makes a tapping noise, and the engine loses power.

Q2: Can I replace a single unit pump? → Yes, but the pump must be coded to the ECU.

Q3: Why does my pump make a tapping noise? → The roller or the cam lobe may be pitted-the contact surface is worn.

Q4: What is the most common cause of pump failure? → A pitted roller surface-the roller surface becomes pitted.

Q5: Does the pump work with biodiesel? → Yes, but biodiesel can accelerate the wear rate.

Q6: What is the warranty on the pump? → The pump has a 12-month warranty.

 

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