Extend The Life Of Your Sprayer

This is part of a continuing series of “how to” articles to help you maximize performance and productivity with Toro® products.

Toro Multi Pro® sprayers are known for their durability. But as with any machine, they require routine maintenance to make sure you’re getting the performance you need and the long service life you want.

This article will cover a general maintenance routine with an emphasis on pump maintenance.

Clean Inside And Out
The chemicals that pass through your sprayer can cause corrosion, create clogs and damage parts, especially if left in the machine when it’s not in use. When you’re done spraying for the day, let “triple rinse” be your motto. Rinse and spray the tank out completely three times, or until the fluid runs clear. All accessories should be rinsed out as well. This will help keep debris out of the tank and ensure that you don’t mix chemicals from different applications. Triple rinse after each use and then let the pump run to be sure the lines are purged and dry.

Cleaning the outside of the sprayer is important, too. Any chemical residue can be a safety hazard for operators and can also lead to corrosion. Use a reliable cleaning product to thoroughly remove dirt and residue from the sprayer.

If you’re storing your sprayer for the winter or won’t be using it for a week or more, follow the cleaning by adding a pump conditioner or non-toxic RV antifreeze to protects the components. Put two to three gallons (7.5 to 11 liters) of pump conditioner in your sprayer and pump it through the system until it comes out of the nozzles. Then shut down your sprayer and store it with the pump conditioner left inside.

Proper Lubrication
Your sprayer is factory greased with 10.5 oz/300 gm of grease at each lubrication point. Over time, grease breaks down and parts need to be re-lubricated to ensure proper performance. Toro recommends adding 1 oz/30 gm of grease to each lubrication point after every 50 hours of normal operation.

  • Use only lithium-based grease
  • Be sure that your grease gun is calibrated so that you deliver the proper amount of grease
  • Make sure the pump is stopped before lubricating

If your pump has been disassembled, such as for replacement of the diaphragms and/or check valves, then it must be greased with 7 oz/200 gm of grease at each lubrication point before returning to operation.

Yearly Rebuild
An annual inspection and rebuild goes a long way toward ensuring years of reliable sprayer operation. Under normal operating conditions, take the pump apart once a year to inspect diaphragms and check valves for wear and cracks. Plan to replace the valves and diaphragm every 450 hours. Your service manual provides complete details, and for your convenience a rebuild kit with everything you need is available through the parts catalog.

If you’re experiencing operational issues that aren’t corrected through the routine maintenance, use this checklist* to help find the cause and solution.

ISSUE                                            PROBABLE CAUSE (S)                  REMEDY

Liquid leaks from pump bottomDamaged diaphragmReplace diaphragm
Grease leaks from pump bottomGrease viscosity is too lowChange to recommended grease type
Grease leaks from the shaft grease sealsGrease viscosity is too low Worn bearings/friction too highChange to recommended grease type Replace pump bearings and grease seals
Lack of pressureLeak on the suction side of the pump Debris in the check valve and/or suction assembly Pump valves are blocked or defective Plugged filters in the fluid systemReplace any damaged parts Clean the check valve and/or suction assembly Check for obstructions and replace if needed Clean filters
System vibrations and unpleasant noisePump valves are blocked or defective Air is being sucked into the systemCheck for obstructions and replace if needed Check for leaks or pinholes in suction hoses; check the fit and tightness of all gaskets and o-rings on suction-side fittings
Lack of flow/capacityInternal wear on conrod and conrod ring Pump valves are blocked or defectivePoor greasing; replace parts as needed and utilize proper grease quality and intervals Check valves for obstructions and replace if needed
Extreme internal erosion on diaphragm covers and housingLack of internal cleaning Stored without pump conditioner Too high vacuum caused by plugged suction filter  Fully clean system according to instructions Always use a proper antifreeze mix during storage Clean suction filter; replace affected pump parts

Contact your local Toro distributor if you have any questions about pump maintenance for Multi Pro sprayers.

More How-To Help

The how-to series is designed to help you get the most from your Toro equipment. If you missed any of the previous articles, just click on the titles below:

Maintaining the Ideal Quality of Cut

Extending Equipment Life With A Fuel Stabilizer

How to Choose a Rotary Blade or Bedknife  

Tier 4 Regeneration  

Hose Maintenance 

Use Service Reminders to Ensure Timely Maintenance 

*Source: Hardi Pump Manual