Dredging World News Blog

Suggested Tips: Dredge Maintenance Schedule

Posted by Elizabeth Kaiser on Wed, May 16, 2012 @ 08:05 AM

Whether you have just installed your new dredge or you have been dredging for a while, you should follow a lubrication and maintenance schedule in order to ensure a long and useful life for your dredge.  SRS Crisafulli includes a suggested maintenance schedule in our dredge Operations and Maintenance (O&M) manuals.

The following suggested maintenance schedule is included in all SRS Crisafulli dredge Operations and Maintenance (O&M) manuals.


  • General condition of unit
  • Engine oil, leakage, pressure gauge registration, pressure warning lamp
  • Fuel leakage, level
  • Coolant level and condition, temperature registration
  • Radiator filler cap fitting condition
  • ALL belts (fan, alternator, air conditioning, water pump)
  • Battery
  • Grease zerks
  • Hydraulic hoses, pumps, valves and components, reservoir and cylinder
  • Gauges and sight bottles
  • Pivoting Traverse Gear Box (if applicable)
Lubrication Points on a Rotomite
Cutterhead seals
 Traverse Bearings Seals
 Ladder Pins



  • Cutterhead bolts and tines
  • Engine oil filter element


  • Primary and secondary fuel filter
  • Main dredge pump


  • Engine oil and engine oil filter element replacement


  • Fuel filter
  • Impeller


  • Sample hydraulic oil
  • Hydraulic filters
  • Valve clearance check
  • Traverse winch drum, idler pulleys and cable
  • Lateral positioning cables and winch drum
  • Safety decals


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Topics: Dredges, crisafulli, dredge, dredging, dredging system, Product Information, Spare Parts, dredging safety

Replacement Parts - Are They Worth Stocking?

Posted by Elizabeth Kaiser on Wed, Nov 30, 2011 @ 08:11 AM

By Troy Fercho, SRS Crisafulli Rental Equipment Specialist

We have all been there. You are right in the middle of a project and something goes out.  Of course it’s going to happen in the middle of your project – parts don’t usually go out while they are just sitting there idle.  So the age-old question is does it pay to stock those critical replacement parts?

In my 15 years in the sales industry, I can remember countless times when I had to overnight parts to contractors or customers who were in the middle of a project and who needed a critical replacement part that had put a stop to all production.  In the best case, the part is in stock and can be sent overnight. Let’s not talk about the production parts that take a week to manufacture, or the part that is on backorder and will take 7-10 days to arrive.

In the dredging industry what is the actual cost of not having those critical spare parts?  The following are just averages but you can plug in your own numbers.

Let’s use an impeller for example:

Cost with having spare part on hand

Initial Cost of Impeller - $1,500.00

Downtime replacing part – 3 hours

Cost of downtime (lost wages) – 3 hours x $200.00 per hour = $600.00

Shipping Charge - $50.00

Total = $2,150.00


Cost of not having spare part

Impeller Cost - $1,500.00

Downtime, 7 days manufacturing time + 2 days shipping – 9 days x 8 hours per day = 72 hours

Cost of downtime (lost wages) - 72 hours x $200.00 per hour = $14,400.00

Next day Shipping Charge - $500.00

Total = $16,400.00

Use this calculator and try it for yourself.

Spare Parts Management Calculator by World-Class-Manufacturing.com

It is an understatement to say that keeping critical spare parts on hand is imperative.  When you look at factors such as unpredictable demand, time tracking the part down, product availability, as well as the downtime waiting for the part, I would say stocking critical spare parts is a key business decision that will save you a lot of money in the long run.

sparepartsWe do have spare wheels but this one is for another customer.  I can expedite one for you, have it ready in about 6 months!


Now there are a couple of questions that you have to ask:

  1. What parts do you keep on hand?
  2. Where do you keep these parts?

To answer question number one, you should consider the working parts that will be subject to wear and tear (i.e. bearings, impeller).  These are the parts you need at the worst possible time – right in the middle of the job. They are the job stoppers.  If you are not sure which items would be best to keep on hand, speak with your operators or mechanics or call the manufacturer and have them give you a list.

Now let’s take a look at the second question.  This is as important as having the parts in the first place.  You planned ahead and stocked key parts, but when the time comes and you need them, you can’t remember where they are.  The best thing to do is to develop an inventory system for storing these parts and make sure that key people are aware of the system. 

You are not working your tail off to lose money or even to break even; you started your business to make money.  I know most of us think we don’t need these parts because we’ll change them out before needed and they won’t go out on you.  The reality is that a majority of people are just too busy and changing them out slips through.  Take a moment and consider the real cost of not stocking your critical replacement parts.



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Topics: dredging system, Product Information, Replacement Part, Spare Parts