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Sit-On-Top Kayak Cart

Parts List:

 
2 each  3.00 x 4 Low Speed Pneumatic Tire & Wheel
This wheel may be purchased from Northern Tool & Equipment Company
Item serarch: # 2252,
3 feet  3/4" Aluminum stock, round
6 feet  3/4 inch SCH 40 PVC Pipe
4 each  3/4"  PVC "T" glue fittings
2 each 3/4" PVC 3/4" x 1/2" glue reducers
2 each  Cotter pins
2 Oz. PVC Primer
2 Oz. PVC Cement
  OPTIONAL REINFORCEMENT
2 each 12" x 3/4" dowl
8 Oz. Silicone sealant
  UNIVERSAL KAYAK/CANOE CART ADD:
2 each 3/4" PVC glue "T" fittings
4 each 3/4" PVC caps
2 each 2' x 1" webbing straps
4 each 1" webbing "Tri-Glide" (terminal ends)
1 each 6' tie down strap

 
  
  Instructions
 Step 1      Cut two picece of the 3/4" PVC pipe 2" long.
 Step 2      Use each short piece to glue on the 3/4" "T" fittings together to for the foundation for each side. One "T" is glued to the center opening and the other "T" is glued to one of the end openings. Before the glue sets, push the assembly firmly against a flat surface to align the fittings.
 Step 3      Cut two 9" lengths from the 3/4" pipe to for the uprights and glue these to what will become the upper end of the previously glued side pieces
 Step 4 Glue a 3/4" reducer fitting, into each of the lower T fittings. This creates a sleeve where the axle will pass through the frame.
 Step 5      (Optional) If you intend to use the cart as a wheelbarrow to transport heavy loads (like dive gear for example) you should reinforce the frame with 3/4" dowels set into the upright side pieces. The dowels will fit somewhat loosely into the PVC pipe and so should be inserted in a generous bedding of silicone sealant, particularly around the "T" fittings. Leave enough room above the lower "T" fittings (the one that the axle sleeve was glued into) for the axle to cross. This dowel will reinforce the T fittings for carrying heavy loads.
 Step 6      Carefully measure the inside distance between the scupper holes of the boat you intend to carry.
 Step 7      Cut the two crosspieces to precisely match the measured distance.
 Step 8      Glue both measured crosspiece length to one side of  the frame assembly.
 Step 9       Glue the other (unattached) side of the frame assembly on to side with the measured lengths of pipe and immediately insert the vertical pieces into the scupper holes of the kayak to be carried. Before the glue sets, you can adjust the joints slightly so that the frame slides easily into the scupper holes. If too wide, you can pull it apart before the glue sets and shorten the crosspieces slightly and try again until you achieve a good fit.
 Step 10       Drill a hole through the axle 1/2" in from the end to accept your cotter pin.
 Step 11      Slide one wheel over the axle and then insert the axle into one of the 3/4" x 1/2" reducer sleeves and out the other side.
 Step 12      Slide the other wheel on the axle shaft and mark it where you will drill a hole for the other cotter pin. Remove the wheel and drill the second cotter pin hole.
 Step 13      Cut the axle 1/2" beyond the second cotter pin hole.
 Step 14      Reinsert the axle through the sleeves, slide the second wheel back in place and insert the cotter pin.
 Step 15      (Optional- if you want to use the cart as a "Universal" kayak/canoe carrier) Add the optional rails shown on the drawing. You should add loops of webbing (not shown) at each end of the top bars. This will help to support the kayak and also keep the uprights from being pushed apart under load. The universal cart will require a tie down strap to keep the kayak in place and depending on the hull shape, may require some rubber or vinyl hose on the cradles to reduce the kayaks tendency to slide on the rails.
 NOTES: 
 
Don't be discouraged if your first attempt isn't perfect. It might be a good idea to go ahead and pick up double the number of PVC fittings needed so that if you aren't satisfied with your first attempt you can jump right in and make any needed corrections. If you notice that the wheels don't turn freely, check to see if the tire inflation valve stems are hitting the cotter pins. If this happens, simply remove the wheels and reinstall them on the axle with the valve stems facing inward. (away from the cotter pins). For the sit-on-top version, you might want to consider smoothing the ends of vertical pieces of pipe and adding some rubber "donuts" over the verticals so that the kayak rests against something soft. You can be as creative as you like with this plan but I would encourage the builder to follow the plans the first time. The optional wooden dowels can also be inserted into the uprights to reinforce the PVC "T" fittings after assembly. To do this, squirt a very generous amount of silicone sealant into each end of the uprights before you slide the dowel in.
I believe that the pneumatic tires on plastic rims are the best for the cart. They ride smoothly over rough surfaces and easily over soft sand. Also the plastic rims are unaffected by salt water. I wouldn't advise anything else unless you will only use the cart on smooth, hard surfaces and in fresh water. I hope you have found these instructions useful.
Dave Martin
Page updated 09/30/2002 rj