It sounds like you have a serious engine problem and I suggest you stop trying to run it as you may cause a lot more damage. Take it to a John Deere repairer who will be able to find out what is wrong with it.
SOURCE: change oil in riding lawn mower
look at the side of the engine down low. There should be a pipe plug screwed in that has a square head. Put a drain pan under the area and remove this plug and the oil will drain out. It's best if the engine is warm. You should get 1 1/2 quarts of oil out of it. Let it drain for about 5 minutes and then re-install the pipe plug. Add 1 1/2 quarts of 30W oil and then cut the grass !
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SOURCE: John Deere 160 riding mower. When I try to engage
CK THE SEAT SWICH OR THE BRAKE SWICH ONE OFEM IS BAD
SOURCE: chute for bagger keeps getting clogged
John Deere LA 125. Chute keeps clogging up with grass.
SOURCE: my john deere rideing mower idles up and down at
The motor has a governor that controls its speed, and if one of the pivoting parts or linkages is sticking this would happen. Look for the throttle linkage on the engine carburetor (move your throttle up and down, watch what moves). The governor will be a second linkage attached to the throttle arm. Squirt some WD-40 on any rotating parts and make sure a foreign object isn't stuck in there. It could also be the part of the governor that's internal to the engine -- harder to get at, but not expensive to fix.
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