Kit # 30015
MAINTENANCE KIT INSTRUCTIONS FOR GENERATION 2-6
KOENDERS WINDMILLS & “EL2” ELECTRIC AERATORS
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This kit includes 1 Diaphragm, 2 Insert Disc Valves, 1 Stainless Steel Spring, 1 Teflon Disc, 1 Rubber Washer & 1 #3 Square Driver bit.
General Instructions (images on Page2)
1. Remove the 12 flange bolts holding the top galvanized Diaphragm cover plate in place. Please note the tension on these bolts when removing and closely duplicate upon
reassembly. Over tightening of these 12 bolts upon re-assembly could deform the ridge on this galvanized cover plate. Tighten to 3.3 ft lbs (40 in lbs), or when using a 5” wrench
handle, apply fairly strong pressure of one finger only!
2. Remove the 4 machine screws holding the Nylon Plate and Diaphragm using a #3 Square head (Robertson black handled screwdriver). A #3 square driver tip has been included
in your Maintenance kit. It is important to note which direction the Insert Disc Valve(s) are installed, if the new valve(s) are put in backwards the unit will not pump air. Refer to the
images on the opposite page for proper alignment.
3. Place the new Diaphragm, new Insert Disc Valve(s), and Nylon Plate back into position and fasten using the four machine screws you removed in step #2. The new diaphragm is
universal and even if it looks different it will fit all modern black Koenders Windmill Compressors and red EL2 Electric Aerators. If your old diaphragm had one large hole in the center
then be sure to also remove the smaller inner diaphragm that may be stuck to the bottom of the Nylon Plate. If the new diaphragm has an additional notched hole that was not
present on the old diaphragm it will get sealed up by the Nylon Plate and/or Piston and is not used on all models. If your old diaphragm has 8 holes on the outside edge then you
have a Generation 1 model and it requires a different Maintenance Kit (Koenders part # 30050).
4. Before reinstalling the top galvanized Diaphragm cover plate, turn the crankshaft so that the piston head holding the diaphragm is positioned all the way up (top end of the
compression stroke). If you are working on an EL2 you can gain access to the crankshaft by removing the 4 bolts on the outside edge of the top black cover and pulling the whole
unit out of the red cover. Put the galvanized Diaphragm cover plate back into position, tightening it down with the 12 bolts that you removed in step #1. It is important to follow the
bolt tightening instructions (3.3 ft lbs) as described in step #1 above. Moving back and forth to opposite sides and alternating from bolt to bolt will achieve uniform tightening of
the Cover Plate.
Model Specific Instructions (images on Page2)
Older Single Diaphragm Koenders Windmills and EL2’s
An Insert Disc Valve is located in the centre of the Cover Plate, as shown on the leftmost diagram on page 2. It is situated underneath the Brass Reducer Bushing which forces the
Insert down on a Rubber Washer. When changing this Insert Disc Valve mark the depth where the Brass Reducer Bushing was. Re-install it to the same depth to ensure that the
Brass Reducer Bushing will properly tighten the Insert Disc Valve against the Rubber Washer. Also be sure to put new Teflon pipe-sealing tape on the Brass Reducer Bushing
before re-installing to prevent air loss around the outside of the Bushing. The Insert Disc Valve must be centered in the Brass Reducer; this will prevent leaking of air and maintain
proper functioning of the insert. Also check the condition of the Rubber Washer that the Insert sits on. If the Rubber Washer is hard or brittle it should be replaced.
Modern Single Diaphragm Koenders Windmills and EL2’s
A Horizontal Check Valve will be situated on the top of the Galvanized Diaphragm cover plate as shown on the center diagram on page 2. This Horizontal Check Valve is precisionmachined cast brass with a 25% glass-filled Teflon disc and stainless steel spring. The spring holds the Teflon disc tightly into place. The Teflon disc may not need to be replaced for
many years. The spring and Teflon disc should be checked periodically and replaced if necessary. It is not recommended to remove the brass assembly from the cover plate. If you
do, make sure you do not tighten it too far when you return it as it could damage the valve underneath. No more than 2 threads should show under the cover plate.
Modern Koenders Windmills without an external valve
Two Internal Insert Disc Valves are located in the Nylon Plate as shown on the rightmost image on page 2. Make note of the different directions they face.
Toll Free: 1-877-888-7707
Website: www.koenderswatersolutions.com
Fax: 306-721-1496
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Older Koenders Windmills and EL2’s
07/18/2016
Modern Koenders Windmills and EL2’s
Modern Koenders Windmills
without an external valve
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and cannot be reproduced without prior approval.