[Skip to Content]

Maintenance Guidelines

In order to keep your Cusco vacuum unit running at its optimal level and to prevent possible equipment failure, the following items must be checked and maintained on a regular basis. For further technical support, please contact our service department.

For your convenience, we have included a checkbox beside each task. To use the guideline, simply print this page and keep on hand as a reminder of your maintenance routine.


1. Check vacuum pump and blower oil levels. Top up oil if necessary.

2. Check hydraulic oil level and cleanliness.

3. All liquids accumulated in exterior moisture traps should be drained after loading. Particularly when temperature falls below freezing mark.

4. Check secondary/moisture trap and muffler assembly (refer to the Operations Manual for further details and instructions).

5. The housing and filter screen should be checked and cleaned at the end of each day of operation.

6. Inspect discharge and suction valves for proper sealing and operation.

7. Check all truck lighting and reflectors for proper operation and cleanliness.

8. Ensure back-up alarm is working (if applicable).

9. Check Power Take-Off (PTO) and controls for cracks, leaks and proper operation.

10. Inspect all auxiliary drain valves and Kamlok caps for proper sealing and operation.

Note: Refer to the Operations Manual for further maintenance instructions of the air filtration system.


1. The following pivot points should be checked for signs of wear or deformation, and then greased:

  • Rear door cylinder mounts
  • Rear door hinge nuts and bolts
  • Nuts and bolts of both upper and lower dump cylinder mounts
  • Rear door wing nuts and bolts

2. Ensure drive shaft and universal joints are greased.

3. Inspect companion flanges, universal joints, drive shaft, including all nuts and bolts for signs of wear, proper alignment and loose fittings.

4. Inspect right angle gearboxes for cracks and proper alignment and check oil levels.

5. Check hydraulic system for oil leaks and loose fittings.

6. Check hydraulic reservoir and reservoir supports for cracks and deformation.

7. Check hydraulic pump and motor mounting for cracks, deformation and loose fittings.

8. Check vacuum pump mounting for cracks and deformation.

9. Check vibrator bolts for deformation and re-torque (refer to vibrator section of Operations Manual for more detailed inspection points).

10. Check side trays for signs of wear and loose fastenings.

11. Check air actuated valves, controls and fittings, for leaks and proper operation.

12. Inspect valve gates for signs of wear and damage.

13. Inspect discharge and suction valve hose fittings.

14. Inspect tank mounting U-bolts and U-bolt plates for signs of wear, cracks or deformation.

15. Check vacuum pump rubber seat for sludge build up and nicks.

16. Inspect vacuum pump sight glass for cracks.

17. Inspect tank support feet and pads for signs of wear, cracks or deformation.

18. Check static line and reel (if applicable).

19. Inspect vacuum pressure gauges and hydraulic pressure gauges for cracks, and ensure proper operation.

20. Ensure pressure relief valves on tank and in piping system, are at 15 psi.

21. Inspect vacuum relief valve, located in piping of all air-cooled vacuum pumps.

22. Check for loose fittings, holes, dents and kinks in all vacuum pump piping, hoses and clamps.

23. Check rotary float gauge assembly for proper sealing and operation, and ensure float ball is free of holes or dents.

Note: Refer to the Operations Manual for further maintenance instructions of the air filtration system.


1. Inspect internal sand-pipe and deflector plate assembly for signs of wear.

2. Check vacuum tank, reinforcement rings and man-ways.

3. Check sight glasses in tank and piping (if applicable).

4. Check auxiliary engine mounts for cracks and signs of wear (if applicable).

5. Inspect paint finish for chips, to prevent rust spots from developing.

Note: Vane type vacuum pumps should be checked and maintained as per manufacture specifications.

Note: Positive displacement blowers should be checked and maintained as per manufacturer specifications.

Special Instructions

1. This list may not cover all of the components on your vacuum unit. Refer to specific sections of Operations Manual pertaining to each of these items.

2. For general maintenance and inspection guidelines of chassis related items, such as brakes, air system, tires, rims and forward lighting, etc., refer to your truck Owner’s Manual.

3. Any loose fittings should be tightened immediately. When nylon lock nuts have come loose, do not reuse them. They must always be replaced.

4. Any part found to be worn, cracked, deformed or damaged, must be replaced immediately. Failure to do so could cause serious injury and/or death to the operator and the general public.

5. Failure to follow these maintenance guidelines will void the warranty.

Copies of the Safe Operation of Vacuum Trucks in Petroleum Service API Recommended Practice 2219 Third Edition, November 2005, are available through Global Engineering Documents at (800) 854-7179 or (303) 397-7956, or purchase them from AIS Engineering Bookstore at US (866) 900-2992, www.ais-engineering-books.com. Information about API Publications, Programs and Services is available on the World Wide Web at: http://www.api.org