Servicing & Repair

Your Onan Partner for Service & Repairs


Generator servicingIf you use and rely on your Cummins Onan generator for your business, then you are more than aware of what damage it could do to your business and turnover if it is not running correctly.  By carrying out regular servicing as per the Onan schedule, generator failures and problems can be prevented before they turn into a full blown breakdown.

This service schedule is there for a reason, and that reason is not to make money but to stop major breakdowns.  For example, the 5,000-hour service on an HDKBB 5KW diesel generator states the generator drive belt needs changing along with the drive belt pulley, hub, coupling and hub drive.  At this point you may think due to the expense, I will leave it for now and then forget all about it.

Commercial generator servicingThe engine that drives the generator is a two cylinder diesel.  Two cylinder diesels are not smooth and produce pulse vibrations.  Some of you in the past may have ridden two cylinder four-stroke motorbikes, and if so you will know what I mean.

The drive belt hub assembly is made with metaplastic bushing (rubber), this design helps to reduce the pulse vibration.  These metaplastic bushes do break up and this is why they need replacing every 5,000 hours.

To put this into perspective, for every hour your generator runs this equates to 40 miles, so at 5,000 hours this equates to your generator travelling 200,000 miles, this is some distance.

You can now see and understand why the Onan service schedule is so important.


Onan Spare GeneratorOnan 5HDKBB-6880 Spare Generator

Since LAS Motorhomes have become a Cummins Onan main dealer we have realised how much businesses depend and rely on their generators.

As this generator is becoming the most popular, we can now offer our regular customers the use of our spare generator which allows them to carry on with their business or important leisure activities if their generator requires a major repair.

If you would like to be one of our regular customers please give us a call on 01604 861999 or drop us an email at [email protected].


Cummins Onan Generator Service Schedules

Petrol and LPG

Every 150 hours
Change the engine oil and filter.

Every 250 hours
Replace the air filter.

Every 500 hours 
Replace the fuel filter and check the valve clearances.


50 hours
First service, change the engine oil and filter.

Every 100 hours
Change the engine oil and filter.

Every 200 hours
Change the engine oil and filter and air filter.

Every 500 hours
Change the engine oil and filter, fuel filter and air filter. Check the brushes.

Every 1,000 hours
Carry out the 500-hour service as above, in addition, check the valve clearances and replace the water pump drive belt.

Every 5,000 hours
Carry out the above services with the addition of replacing the engine to generator drive belt and cash drive.

Every 10,000 hours 
Carry out all of the above and now replace the rotor bearings.


For all your generator maintenance enquiries please call LAS Motorhomes on 01604 861999.