Senin, 26 Mei 2014

What is wrong with my lawn tractor? 1981 statesman 18hp?




chich


I have a little trouble staring it. I have to hook it to my truck battery to get it to turn over enough to start. After it starts and warms up it acts like it is over heating and looses power in all 4 gears when it is taking off and when i am going up the least little hill. It does alright on completely level ground. I have changed the oil and put new spark plugs in it and have cleaned out from around the heads and the fly wheel and it still looses power. What could be wrong with it???


Answer
You have two separate problems. Having to jump start it indicates a bad battery (is the battery the same age as the tractor?), or charging system. The power loss when it gets warm sounds like a bad ignition coil or breaker points. A weak ignition will be more evident under a load. You may also have a fuel flow problem, which again shows up under load. A restricted fuel filter, debris in the float valve or even the carburetor jets. A dirty air filter will cause the engine to smoke but you didn't mention that as a symptom. One last thing. Make sure the engine governor linkage is able to move freely. If the governor can't open when a load is place on the engine, you will get the same symptoms.

I have a Craftsman riding lawn tractor, a Lt1000 auto trans but it only has reverse gear?




Rod G


It has no forward gears, won't move forward, but does have reverse,,What could be causing this problem ?? Thanks in advance, Rod


Answer
1. Be certain that the amount of oil you added and the oil SAE is correct (10W / 30W) - It is possible you have air trapped somewhere in the transmission or if the amount of oil is inadequate the pump may be cavitating, (pulling air).

2. Check the shift linkage and be certain that the adjustment is correct. The second season for my tractor I noticed that the forward speed was dropping off and I changed the linkage to provide greater range of movement on the control arm located on the transmission. If your model is like mine you will notice that the transmission shift linkage arm (on the transmission) has 2 location holes for the shift linkage rod. The factory installation uses the hole farthest away from the pivot point for the control arm which minimizes the movement and thereby the forward and reverse speeds. I moved the shift linkage to the inside hole on the transmission shift control arm and the speed, especially forward, was back to its' perky self. Prior to moving the linkage arm, the shift knob would hit the limit of the Z slot and limit speed. Now the shift know does not bottom out, rather, the shift control in the transmission limits the movement of the shifter knob. No doubt now that the shifter is requesting full forward from the transmission.

3. Check the linkage to be sure that when you place the shift into forward that the dump valve is not engaging somehow. The dump valve is associated with the brake and is used to regulate pressure in the transmission to achieve a clutch effect. If you have noticed, when you have the transmission in full forward (normally working transmission) and the throttle full, you can ease off the brake and the tractor will gradually increase the forward speed as you continue to release the brake to full off positing. This is accomplished through a linkage tie into the transmission to push down what appears to be a little plunger or button on the transmission. It is also possible that the little plunger is sticking. keep in mind that the hydraulic force needed to move in reverse may not be as much as for forward due to internal gearing. In other words, your hydraulic pressure may be low in general and only showing its' ugly head in forward.

4. Can your tractor back-up a hill with authority? If it can then you may have an internal leak in the forward side of the internal system.




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