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Remove the handle, disassemble the lower section of the top to get to the heater. Make sure the unit is unplugged! Use miniature bottle brushes like the painters use to clean paint sprayers (I purchased mine from Harbor Freight for about $4) and clean out the ports. Also check the valve that the trigger opens. It is located just above the heater.
On my LGM, the motor that drives the soap pump had siezed. I disassembled down to the pump and separated the motor from the pump. With pliers, forced the motor shaft to turn and sprayed lubricant (lithium grease) onto motor's front and rear bearings. Heater box is a little tricky to remove. Remove 4 screws to remove top plate. Lift heater out and remove insulator. Remove two screws from inside box to remove heater box bottom.
Need model #, but if unit is NOT a pro 2X then see following repair. If the unit does not spray from nozzle but DOES spray from upholstery hose, then the heater is likely clogged and the upper handle must be disassembled and heater removed and replaced. If the spray doesn't come out from either place, then check belts. If belts are o.k. you need to disassemble base and likely replace pump. pump replacement is a little tricky.
Remove the cap for the flow indicator, then there 6 screws to remove to take off the top, before removing the top, turn the smart mix valve to about the half way point so the piston won't fall off. When you are ready to re-install the top cover, just before pushing it all of the way down, turn the smart mix valve to the water only setting, then push it into place, re-install the screws and the flow indicator parts.
Unscrew the cap for the flow indicator, remove the 6 screws, the top will come off. When you put the top back on, make sure the piston is hooked on the smart mix knob(underneath the top cover) set the smart mix valve in the wtaer only setting, then put the top back on. Turn the smart mix valve to make sure it is turning like it should, then re-install the 6 screws and the flow indicator parts. (don't over tighten the screws)
First take off the cover on the left side oif the top cover, then turn it over, remove the screw holding the red lock and pull the cap and brush roll out, remove the cap, remove the cogged belt, then you can put the new pump belt thru that slot, put over the pulley on the pump and then stretch it to go over the motor shaft. Then put back together.
Most times they don't break, it is the 2 screw holes at the back that back and the top will raise up from the base. If this is the case, remove the 2 screws and install longer ones with a flat washer on them to fashen down the top. But first the top will have to be removed to put the handle release in the right spot. You would probably look at around $60 to repair, unless the top needs replaecment, then it would be more parts.