pma assembly tips

hi everyone, these are some tips to help with the assembly of a pma for long term use. these tips are what works for me and has proved true time and time again. after all work and testing is done , this means any and all work is complete and is ready for install. at this point you need to completely dismantle the unit, the bearing need the grease removed and new extreme low temp grease installed, one vary small drop at each ball on one side and 3-4 drops of lucas stabilizer on the other side. if your rear bearing is a needle bearing, use the same extreme low temp grease and about 1/4 fill the bearing cup with lucas, at assembly you will use one strand of wire from a 14 wire placed in the seal while installing the rotor to allow any extra oil to leave the bearing. the inside of the casing needs to be painted to stop any corrosion . the rotor needs to be painted also for corrosion . if the pma is a 3 phase any conections must get a piece of shrink tube before being secured down, the wires from each phase needs to be long enough to reach the first connection at the slip ring without any splices. these wires also need to be secured to the pma rear housing after the stator is installed. if the pma is a dc type you also need to use dielectric grease on all bolts and electrical connections for the rectifier . the stator should already have a coating on it to protect the windings, if not you MUST coat the windings with something to protect them from vibration in the wire from the eddie currents and frequencies , these cause the wire to try to move around and rub together and cause shorts over time. I use 5 minute apoxy on the units with no coatings, let the stator warm in the sun or nere a heater before applying the apoxy and it will be drawn into the center of the stator core by the heat, no extreme heat only good and warm to the touch. try not to be messy because you will be cleaning a lot to get it to assemble again. now when your assembling the pma you need to coat all bearing surfaces with grease on the rotor, there is usually two types of casings used, two front covers, one front and one back, this is the better in my opinion because of the larger bearings on both ends , this type can only be used on the three phase because you cant install the rectifier in this configuration . the standard rear casing must be installed in the proper way because there is drain holes at the bottom and the wires should exit also at the bottom , look at the casing and you will see the holes I'm talking about. the wires need to be secured to the rear pma housing before the rotor is installed and checked for clearance of any rotating parts of the rotor. the screws for assembling the cases need to be greased with dielectric grease for corrosion and will fuse to aluminum from the field currents being absorbed through the cases when in service over time. after assembly everything should be checked for clearance and smooth operation, once everything is good you can paint the outer casing if you have not already. once complete the unit should be tested on a test bench for all the needed install data , these numbers will let you use the right parts for the install the first time and save any extra work and time. the blades need to be balanced, this is done with a string and a thimble, most thimbles have one dimple in the center on the top, drill this dimple to the string size and install the string, insert the thimble through the hub and to the ceiling, this should be done inside so any wind wont be a problem. take a measurement from the tip of each blade to the floor and add any weight to the tips as needed, flat washers work good, if you need any more than two washers for any one blade you should move blades around as needed to achieve the balance, this can be time consuming if your using home made blades, each blade should be balanced before assembly to help speed this assembly up.  this is the process I use and has given vary good results every time. I hope this helps anyone with the assembly of a pma, if any help is needed just ask. thanks for reading.