Frequently Asked Questions

You’ve got questions. We’ve got answers.

What are some items to consider when choosing the best spray unit for my business?

  • Size – Tank size should be based on the number of gallons of product you’ll carry per day.
  • Spray Rate – Know the manufacturer’s recommended rate of spray for the chemicals you’ll be using.
  • Pump Type – Piston or diaphragm? The choice is often based on application and customer preference.
  • Agitation Needs – Mechanical agitation works best for powdered products, and jet agitation for liquid products.

What is the difference between jet agitation and mechanical agitation?

Mechanical agitation uses paddles attached to a rotating belt-driven shaft to stir the liquid. Jet agitation stirs the contents of the tank with pressure from the pump.

How long does it take to build a spray rig?

The timeframe is roughly a couple of weeks to a couple of months. That may seem broad, but there are a lot of factors involved. In terms of man-hours, the range is roughly 40 to 48.

Does Graham provide financing and delivery of spray units?

We offer special financing on trucks equipped with our spray units, as well as delivery throughout the continental United States.

What is Graham’s warranty?

Graham Spray Equipment warrants new equipment of its own manufacture for 12 months against defective workmanship and materials under normal use and service, but not against damage of any kind resulting from erosive or corrosive liquids handled by the equipment, from improper installation or maintenance, or from misuse, negligence, alteration or accidents. For more information, visit

How long do Graham spray rigs last?

Graham spray units can stay in the field for up to 30 years with proper maintenance.

What post-purchase care does Graham provide?

  • We will teach you how to use and maintain the products you purchase.
  • Our lawn spray equipment comes with lifetime phone support.
  • We sell over 1,800 parts to service our turf spray equipment and can usually talk you through a repair over the phone.

What does “lifetime phone support” mean?

It means we’ll be available to answer any questions you have about our spray equipment as long as it’s in service and we’re in business.

What can I do to keep my rig at peak performance during the busy season?

  • Mechanical Agitators – Grease the packing bearings.
  • Hose Reel Swivels – Check for leakage at swivel joints that indicates the swivel needs to be greased.
  • Regulator T-Handles – Turn them in and out once or twice a week to prevent sticking.
  • Pump Screens – Clean screens daily for maximum efficiency.
  • Hoses and Belts – Look them over for signs of excessive wear and tear, dry rot and cracks or leaks.
  • Loose Belts – Adjust the idler tension so that there’s a half-inch of spring in the belt.

What can I do to maintain my rig during the off-season?

  • Remove strainer caps and screens.
  • Open ball valves on suction lines.
  • Remove nozzles from spray guns and fix triggers in the open position.
  • Remove the regulator plug or open the drain valve.
  • Open all tank valves, including the drop valve.
  • Open all valves on reels.
  • Turn the pump over until all liquid is drained.

Does Graham provide winterizing services?

We do. Alternatively, we’ve provided a “How to Winterize Your Unit” guide on our Videos page so you can do it yourself.