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This can be an aggravating problem with a simple solution. There are keyways on each axle shaft, and what oldtimers call a Woodruff key. That's the piece of metal that forces the wheels to turn with the axle. Try tightening the locknuts. If that doesn't work they can be replaced easily.
Depending on the style of chair. If the seat is supported by 4 individual posts, or a single post. You will have to remove the seat either way. If it is 4 posts, you will have to remove the retaining pins and raise each post. If it is a single post, usually this has a bolt that needs to be loosened and removed before you can raise the post.
Open the rear cover. Disconnect the large power plug. Remove the retainer pin from the front footplate assembly. Lift the footplate and front panel assembly up and then forward. Slide the battery tray forward - minding that the battery power plug will need to travel to the front. Once the tray is out, unsnap, unbolt and replace the batteries. Reassemble in reverse order.
Bird If you have help you can tilt the chair to the side of the good tire and place a block under the frame behind the flat tire set it down on the block to lift the flat tire off the ground enough for you to remove the bolt holding the tire on the axle remove the tire assembly and the rim is a split one remove the 4 nuts holing it together and remove the tire and tube to patch the tube then reverse the procedure to get it back together. Put grease or vaseline on the axle before you put the rim back on and then tighten the nut you should be rolling again Hope this helps
This mnaual wheelchair has dual position rear axles and caster forks to allow seat to floor height changes with no additional components. What this means is that the wheelchair is adjustable in height based upon the position of the front caster wheel axles and rear wheel axles. Raising the axles lowers the chair. Lowering the axle postion raises the chair. If the rear axles of the rear wheels are in the top position you can lower the wheels and raise the chair. Likewise, if the caster axles of the front wheels are in the top hole of the fork then put the wheels and axles in the lower hole to raise the chair. It is easy to accomplish this with basic tools.
If the front and rear wheels are already in the lower holes (the chair is in its highest position) you have another option. This option is a more expensive way to raise the chair by buying 4 new wheels. Lets say for example you have 24" diameter rear wheels. If you purchase new 26" diameter wheels you will raise the chair 1". If you have 6" casters and put on 8" casters this raises the chair 1" in the front. Hope this helps.
The quick release axles on this chair have an adjusting nut on the outside end to adjust the length. The nut may have a disc cover on it for decoration. To adjust the axle length hold the end with the two balls on it with an adjustable crescent wrench set for the axle diameter and at the location of the balls. This way when you adjust the nut, the axle will turn until the balls contact the crescent wrench and the axle will stop turning. Turning the nut counterclockwise will lengthen the axle. All the nuts require a 3/4" wrench. Once you have made the axle longer you may need to put a washer between the hub and the axle receiver to keep the hub from rubbing.
In my experience, the hub may be rubbing because the camber tube is not even where the frame connects/clamps to it. Loosen the camber tube mounting bolts or clamps. Measure both sides and correct by marking the original camber tube position first, then adjust left to right for even spacing. Only adjust left to right do not rotate the camber tube since that will change the camber (unless you have zero camber). If you lengthen the axles this way check that the new adjustment allows the axle to lock in the camber tube. Tug on the wheel to make sure it is locked in the tube before getting in to ride. Hope this helps.
cathjh7 what type of chair do you have? Are you talking about the drive wheels on the motors? Usually there is a bolt or nut in the center of ech wheel. On some chairs there is a lock washer with a bent tab keeping the bolt from getting loose. This tab must be bent down flat before you can remove the bolt. Once you have the bolt or nut removed pull up on the wheel and it should come off the axle. Now for the bad news---- if the wheels have not been removed in a long time and you have ridden through water or in wet grass the hub can get rusted to the axle and they are very difficult if not impossible to get off. I have had to use a tierod tool to get them off and I have had to replace the entire motor because I couldn't get the wheel off the axle. It might be best to see the provider you got the chair from for help with this problem. Hope this helps you
The three light flash indicates a short circuit between the left motor(as you are sitting in the chair)and the battery. Check all the wiring from the control box to the motor and make sure it is not damaged in any way. If it is okay, you have most likely fried the left side motor. A new motor-gearbox assembly for this chair runs in the neighborhood of $1,400.00, or you can take the motor off and take it in for a full rebuild for about $250 or so. Unplug the joystick and remove the seat and cowl. Jack up the left side with both motors in gear. Remove the center nut cover and take off the nut holding on the wheel taking care to retain the key that slides into the groove on the axle. Disconnect the wiring plug to the motor and remove the six bolts holding the motor to the frame. Separate the gearbox from the motor and take the motor to a rewind shop for repairs. Reinstall and it should be good to go.