FAQ - Dishmachine - Service/Maintenance
Q: How do I remove the impeller from the washpump?
A: The impeller turns counter-clockwise to remove from the shaft. You will need to hold the other end of the motor shaft secure by removing the dust cap on the back of the motor to gain access to the end of the shaft.
Q: What is the correct orientation of the washpump shaft seal?
A: The shaft seal is made up of two parts. The stationery seal which has a white ceramic face and installs into the pump first with the white portion facing the impeller. The rotating seal has a graphite face and must be installed facing the white face of the stationery seal. Be sure the surface of the installation is very clean before installing. Use a little hand soap on the outside of the stationary seal to make it slip into the hole easier.
Q: How often should I clean the line strainer?
A: Under normal conditions, every 2 months should suffice.
Q: Do all Knight dishmachine use the same door switch?
A: No. Older machines had a slightly different wiring configuration that requires a higher current switch than the standard door switch used on today’s machines. The high current switch is Knight P/N 9601317-1. This is for older machines only. All other machines use the standard switch except the KLE-112.
Q: How long does a washpump motor typically last?
A: In many cases 10 years or more. Motors generally go due to a shaft seal that has torn due to glass in the pump. The water gets into the front motor bearing and eventually causes it to rust and seize.
Q: How long does a squeeze tube typically last?
A: Usually 6 months under normal operation. Rough operating conditions and/or chemical incompatibility will decrease the tube life.
Q: How often should squeeze tubes be lubed? How much lube do I use?
A: Apply a light coat of lube to the tube and rollers once a month.
Q: What type of lube should be used on squeeze tubes? Is a petroleum based lube okay?
A: Use Knight KTL-20 tube lube or an equivalent silicone based lubricant. Do not use a petroleum based lubricant!
Q: Does the flow rate of the pump change when the squeeze tube is changed? Will this affect my dosage amounts?
A: The flow rate will change when a new squeeze tube is installed, however the variation may not be significant enough to cause dosage problems. Its always a good idea to check the flow rate after the tube has been changed. For systems that have an auto-calibrate function, the pump should be re-calibrated to ensure accurate product delivery.