ncaaref Posted September 24, 2009 Report Share Posted September 24, 2009 I have 98 Sundnce optima and Pump number 2 needs a new impeller I have the pump out of the spa but unlike pool pumps, I can't get the rear cover off of the pum to hold the shaft to turn the impeller to loosen it. It it a Theramax II 2.5 HP pump. Does anyone know how to get the impeller off? Thanks Quote Link to comment Share on other sites More sharing options...
rusty-D Posted September 24, 2009 Report Share Posted September 24, 2009 can you see the shaft between the motor and the volute? I normally hold it from there with needle nose vicegrips and works fine. I also have use a long screwdriver to hold the fan and uscrew the impeller, but that is only if the fan is made out of metal, I don't want you perform this, if it's made out of plastic... good luck. Quote Link to comment Share on other sites More sharing options...
ps558 Posted September 24, 2009 Report Share Posted September 24, 2009 can you see the shaft between the motor and the volute? I normally hold it from there with needle nose vicegrips and works fine. I also have use a long screwdriver to hold the fan and uscrew the impeller, but that is only if the fan is made out of metal, I don't want you perform this, if it's made out of plastic... good luck. As stated above works best. Since you are replacing the impeller it there is little room for the vice grips, you break the plastic throat with a screwdriver to gain better access the motor shaft. If it really stuck. turn the pump sitting on the wet end and soak with liquid wrench for a while. If that still doesn't work you might have to drill the impeller off Quote Link to comment Share on other sites More sharing options...
ncaaref Posted September 24, 2009 Author Report Share Posted September 24, 2009 Yes the impeller is made from plastic so it look like the second is my option. I really can't believe that the rear Cover can't be removed like a pool pump this makes it so easy. Quote Link to comment Share on other sites More sharing options...
n1oty Posted September 24, 2009 Report Share Posted September 24, 2009 Yes the impeller is made from plastic so it look like the second is my option. I really can't believe that the rear Cover can't be removed like a pool pump this makes it so easy. Try popping the little cover off. It is located dead center at the rear of the pump. It will reveal a slotted shaft. John Quote Link to comment Share on other sites More sharing options...
ncaaref Posted September 24, 2009 Author Report Share Posted September 24, 2009 Yes the impeller is made from plastic so it look like the second is my option. I really can't believe that the rear Cover can't be removed like a pool pump this makes it so easy. Try popping the little cover off. It is located dead center at the rear of the pump. It will reveal a slotted shaft. John Will Do! Quote Link to comment Share on other sites More sharing options...
Roger Posted September 25, 2009 Report Share Posted September 25, 2009 Yes the impeller is made from plastic so it look like the second is my option. I really can't believe that the rear Cover can't be removed like a pool pump this makes it so easy. Try popping the little cover off. It is located dead center at the rear of the pump. It will reveal a slotted shaft. John Or a shaft with 2 flat sides for a wrench. Never ever hold the shaft with a vice grips or stick a screw driver in the fan blades or anything like that. Always go to the opposite end of the shaft and hold it there. Quote Link to comment Share on other sites More sharing options...
RFD100 Posted September 25, 2009 Report Share Posted September 25, 2009 I replaced both pump wet ends on my 2003 Sundance Marin. The impellers were screwed on with left handed threads. I used a pair of vise grips to hold the shift and a lager pair of channellocks and it screwed right off. Quote Link to comment Share on other sites More sharing options...
rusty-D Posted September 25, 2009 Report Share Posted September 25, 2009 Al pumps are different , I mostly worki with Starite pumps which don't have access from the back since they have the speed switch system on the back, that is why I always do use visegrips, hey! whatever it works!... good luck Quote Link to comment Share on other sites More sharing options...
Roger Posted September 25, 2009 Report Share Posted September 25, 2009 Al pumps are different , I mostly worki with Starite pumps which don't have access from the back since they have the speed switch system on the back, that is why I always do use visegrips, hey! whatever it works!... good luck There is always access to the back of the shaft. It is more difficult to get to on some than others. Quote Link to comment Share on other sites More sharing options...
dotdog2 Posted September 25, 2009 Report Share Posted September 25, 2009 Often when I cant hold a shaft like on an alternator or motor or anything of that nature an air powered impact gun will take it right off or put it back on tight. There is always a way to hold the shaft but when I dont feel like it I just hit it with the impact gun and it always pops right off. Quote Link to comment Share on other sites More sharing options...
Roger Posted September 25, 2009 Report Share Posted September 25, 2009 Often when I cant hold a shaft like on an alternator or motor or anything of that nature an air powered impact gun will take it right off or put it back on tight. There is always a way to hold the shaft but when I dont feel like it I just hit it with the impact gun and it always pops right off. But there is no nut on an impellor. The threads are built into the impellor. Quote Link to comment Share on other sites More sharing options...
n1oty Posted September 25, 2009 Report Share Posted September 25, 2009 Al pumps are different , I mostly worki with Starite pumps which don't have access from the back since they have the speed switch system on the back, that is why I always do use visegrips, hey! whatever it works!... good luck But this guy says he has Sundance theramax pumps, which means these are Aquaflo XP2's. There has to be a cover on the back and the slot in the rear of the shaft will be revealed. John Quote Link to comment Share on other sites More sharing options...
dotdog2 Posted September 25, 2009 Report Share Posted September 25, 2009 Often when I cant hold a shaft like on an alternator or motor or anything of that nature an air powered impact gun will take it right off or put it back on tight. There is always a way to hold the shaft but when I dont feel like it I just hit it with the impact gun and it always pops right off. But there is no nut on an impellor. The threads are built into the impellor. Sorry, didnt realize that. Quote Link to comment Share on other sites More sharing options...
mrfixit Posted September 26, 2009 Report Share Posted September 26, 2009 If the impellor is siezed onto the shaft ( which it often is) and you cannot get a pair of vice grips between the wet end and the motor housing, you will need to either remove the rear of the motor, or break the impellor to get it off. Drilling the impellor is a good idea, and alot less work than removing the rear cover of the motor. Putting a screw driver in the end of the shaft will probably not work because you a human hand cannot put enough force into that screwdriver to hold it when the impellor is siezed onto the shaft. However, if you decide that you do want to remove the rear cover of the motor, there are usually 2 or 3 slots on the edge of the rear cover where you can fit a screwdriver into. Carefully pry the rear cover open little bits at a time as you work your way around the cover. There, you can get vice grips onto the shaft. If you take this route, you may as well change the bearings while it is broken open. Good luck. Quote Link to comment Share on other sites More sharing options...
ncaaref Posted September 30, 2009 Author Report Share Posted September 30, 2009 Ok Guys I was able to hold the shaft with a pair of vice grips and turn the impeller with little effort and it came right off. Now I have a new problem. I replaced the seal kit, impeller and wear ring. Now when I turn the pump on I have great flow but the pump sound horrible very loud, roaring noise? I am Puzzled! any Suggestions? Quote Link to comment Share on other sites More sharing options...
Roger Posted October 1, 2009 Report Share Posted October 1, 2009 Ok Guys I was able to hold the shaft with a pair of vice grips and turn the impeller with little effort and it came right off. Now I have a new problem. I replaced the seal kit, impeller and wear ring. Now when I turn the pump on I have great flow but the pump sound horrible very loud, roaring noise? I am Puzzled! any Suggestions? Did you put any Magilube on the new seal? Did you buy a quality seal? Did you bend the shaft or mar it? Shoulda used the nut or slot on the other end. Quote Link to comment Share on other sites More sharing options...
bart6453 Posted October 1, 2009 Report Share Posted October 1, 2009 Ok Guys I was able to hold the shaft with a pair of vice grips and turn the impeller with little effort and it came right off. Now I have a new problem. I replaced the seal kit, impeller and wear ring. Now when I turn the pump on I have great flow but the pump sound horrible very loud, roaring noise? I am Puzzled! any Suggestions? Hmmm...most likely cockpit error. I am thinking something is not right from you not assembling it properly. I would go back and check my assembly, and clearances, look for new wear spots from parts that are contacting each other in the impeller assembly. Just an idea. Quote Link to comment Share on other sites More sharing options...
ncaaref Posted October 1, 2009 Author Report Share Posted October 1, 2009 Shaft not bent, and no mag lube on the seal. Quote Link to comment Share on other sites More sharing options...
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