01/2015
– Page 4 of 5
QUICK GUIDE
Digital Overspeed Switch (DOS)
The Digital Overspeed Switch continuously monitors the engine’s speed. In the event of an overspeed condition which
will occur during a loss of prime, the DOS will automatically shut down the engine to prevent the risk of damage to the
engine and pump.
The DOS has an integrated LED for troubleshooting and an OFF switch to manually shut down the engine.
Important:
Cut-out switch must not be made inoperative.
To shut down and store the MARK-3 unit
1. Shut down the pump.
a.
Gradually reduce the engine speed and move throttle to “STOP” position.
b. Allow unit to run for approximately 2 minutes with throttle in this position for proper cool down.
c.
Press and hold the “OFF” button on the DOS until engine shuts down.
d. Drain pump after final use.
2. Check and store the pump.
a. If the pump was last run with foam or water that is salty, brackish or high in mineral content, flush the pump
with fresh water for a minimum of 2 minutes or until the water is clear.
b. Completely drain the pump of all water.
c. Visually inspect the pump end. Clean any dirt or debris from the pump unit. If necessary, a mild soap and
water solution can be used. Note and report any performance irregularities or any abnormal mechanical
sounds.
d. For long term storage, drain the carburetor of the fuel. Pour 5 mL (0.17 oz.) of 4-cycle engine oil (any viscosity
will do). Slowly crank the engine to cover the piston rings, cylinder and crankshaft with oil to protect the
components from corrosion. Storage seal fogging oil can also be used.
Important:
2-cycle oil is not recommended as preservation oil; it tends to attract moisture.
e. Follow any other product, component, apparatus, and departmental procedures and/or guidelines before
placing the unit in storage. Make sure all necessary tools, spares, and accessories are with the pump.
To operate the MARK-3 unit in cold weather
•
The pump can be run in below freezing temperatures if certain precautions are taken to avoid the formation of ice
in the pump.
•
After priming the pump, the unit should be run at low speed for a short period of time to allow all components to
warm up before continuing with the remaining operating procedures.
•
Unless wrapped in a heater, drain the pump of all water if it is stopped for any length of time. The engine/drive unit
should be turned over a few revolutions to make sure all water has been removed from the pump. Drain the pump
priming line if a primer has been used.
•
After use, drain the pump, manifolds, and lines of all water. You can also pour some RV antifreeze into the pump
and circulate it through the pump and plumbing system.
Warranty, Service and Support
Product and service documentation such as tech notes, data sheets, manuals and information on the limited warranty
provided on products manufactured by
WATERAX
can be found on our Web site at:
