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The Model Tennant 7400 scrubber and the maintenance chart

Thursday, July 27, 2017

If you are familiar with the Tennant Model 7400, you are one of the many of thousands that can appreciate this model. First introduced in 1996, many of the Tennant sales group was wary of its success. Remember it was replacing a machine that was around since 1979 and that machine was the Tennant 528. At the time many thought that the 528 was irreplaceable which was quickly disputed.

Now we are talking about the 7400 in the same manner, a relic of a time gone-by. But for those who still are running this equipment it is a testament to the quality and design of one of my favorite scrubbers. So, how can this equipment still be running on a daily grind among the newest? It is all in the dedicated service man or woman who has maintained the equipment Let us take a look at the simple maintenance chart for this scrubber.

Maintenance charts were developed to guide the service person on how to maintain said piece of equipment. The chart is broken down into timed intervals which include daily maintenance.

50 hours maintenance
100 hours maintenance
200 hours maintenance
400 hours maintenance
800 hours maintenance and beyond…

Let me go through some of these. However due to space restrains, if you want the entire chart, I could e-mail it to you per your request.

The daily chart is a very important chart indeed.

1. Check the engine oil level.
2. Check the engine air filter indicator.
3. Check the rear squeegees for damage and wear.
4. Check the side squeegees for damage and wear.
5. Drain and clean the recovery tank (dirty water tank).

The 50 hour maintenance: Simple rotate the scrub brushes end-to-end or front-to-rear.

The 100 hour maintenance: This is where it needs to be checked thoroughly.

1. The radiator exterior core needs to be cleaned.
2. Check the coolant level.
3. Change the engine oil and the engine air filter.
4. Check the engine cover seals for damage or wear.
5. Check the fan belt tension
6. Check and/or adjust the idler speed.
7. Check the hydraulic reservoir level.
8. Check the tires for damage such as cuts.
9. Clean the rear squeegee with soapy water and relevel the blade for maximum performance
10. Lubricate the rear squeegee casters.
11. Lubricate the scrub brush idlers.
12. Check the scrub head skirts for damage and wear
13. Check the side brush skirt for damage and wear.

From this point there is the 200 hour, 400 hour and the 800 hour maintenance. At 800 hours, the following items must be performed.

1. Replace the filler cap for the hydraulic reservoir.
2. Replace the hydraulic suction strainer.
3. Change the hydraulic fluid.
4. Check for wear and tears of all the hydraulic lines.
5. Flush completely the coolant system.
6. Retorque the propelling motor shaft nut.
7. Retorgue the front drive wheel nuts.
8. Clean and retighten the battery cables and all related connections.

Keep in mind that all along you must still perform the 100 hour and at this point you would have performed this eight times. See where I am going with this? In other words, at this point you would have performed the 100 hours eight times, 200 hour four times, 400 hour twice and now the 800 hour. So that’s a lot of maintenance and that is what it takes to keep this equipment up and running. And above this, if you are running this equipment in a really dusty or severe environment, you would want to perform these maintenance items even more often, so keep that in mind as well.

I appreciate you reading every month and have a good summer.

Creamer’s Corner is a monthly conversation with Hi-Gear’s Mike Creamer giving you advise, technical assistance, brand comparisons and on the job stories on repairing, maintaining or replacing your sweeper/scrubber. For your comments or questions, please e-mail Mike at editorial@mhnetwork.com.

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