Hayward Max-Flo XL Max-Flo XL Manual - Page 17

 Pump Won't Prime: 1. Empty pump/strainer housing. Make sure the pump/strainer housing is filled with water & the cover o-ring is clean. Ensure the o-ring is properly seated in the cover o-ring groove. Ensure the o-ring sealing surface is lubricated with "Jack's 327" and that the strainer cover is locked firmly in position. Lubricant will help to create a tighter seal. 2. Loose connections on the suction side. Tighten the pipe/union connections. NOTE - Any self-priming pump will not prime if there are suction air leaks. Leaks will result in bubbles emanating from the return fittings on the pool wall. 3. Leaking O-ring or packing glands on valves. Tighten, repair, or replace the valves. 4. Strainer basket or skimmer basket loaded with debris. Remove the strainer housing cover or the skimmer cover. Clean the basket, and refill the strainer housing with water. Tighten the cover. 5. Suction side clogged. Contact a qualified repair professional. You should have 5" - 6" of vacuum at the strainer cover (your pool dealer can confirm this with a vacuum gauge). You may be able to check by removing the skimmer basket and holding an object over the bottom port with the skimmer full and the pump running. If no suction is felt, check for line blockage. a. If the pump develops a vacuum, check for a blocked suction line or a dirty strainer basket. An air leak in the suction piping may be the cause. b. If the pump does not develop a vacuum and the pump has sufficient "priming water": i. Re-check the strainer housing cover and all threaded connections for suction leaks. Check if all system hose clamps are tight. ii. Check voltage to ensure that the motor is rotating at full rpm's. iii. Open the housing cover and check for clogging or obstruction in suction. Check the impeller for debris. iv. Remove and replace the shaft seal only if it is leaking.  Low Flow - Generally: 1. Clogged or restricted strainer or suction line. Clean skimmer strainer basket and/or pump strainer basket. Contact a qualified repair professional. 2. Undersized pool piping. Correct the piping size. 3. Plugged or restricted discharge line of filter, valve partially closed (high gauge reading). Sand filters - backwash as per manufacturer's instructions; D.E. filters - backwash as per manufacturer's instructions; Cartridge filters - clean or replace the cartridge. 4. Air leak in suction (bubbles issuing from return fittings). Re-tighten the suction and discharge connections using Teflon tape. Inspect other plumbing connections, and tighten as required. 5. Plugged, restricted, or damaged impeller. Replace the impeller including a new seal assembly.  Noisy Pump: 1. Air leak in suction piping, cavitations caused by restricted or undersized suction line or leak at any joint, low water level in pool, and unrestricted discharge return lines. Correct the suction condition or throttle return lines, if practical. Holding your hand over the return fitting will sometimes prove this, or by putting in a smaller eyeball fitting. 2. Vibration due to improper mounting, etc. Mount the pump on a level surface and secure the pump to the equipment pad. 3. Foreign matter in the pump housing. Loose stones/debris hitting the impeller could be the cause. Clean the pump housing. 4. Motor bearings can become noisy from normal wear, rust, overheating or concentration of chemicals. If the motor bearing seal is damaged from leaks, chlorinated water can seep into bearing washing out the grease and could cause the motor bearing to whine. Replace the motor and any seal leaks should be repaired at once by replacing the shaft seal. 5. Place pump closer to water level. Page 17 of 20 USE ONLY HAYWARD GENUINE REPLACEMENT PARTS Max-Flo XL Pump IS2300 Rev-A1