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Sounds like you might be on to the problem. If it stops when you pull both levers in, obviously the clutches are disengaging properly. My crawler will not turn when I pull one lever only and without using one of the brakes, that is if I'm on a straightaway with no load (it will slowly drift in the direction of the pulled clutch lever though). If I'm going uphill or are dozing something (providing forward resistance), and pull one lever only, then it will turn without using the corresponding brake. You can try that to be sure, try dozing a load of dirt or going up a hill and then pull only one lever. The machine should start to turn with some intensity in the direction of the pulled lever (although not a pivot turn). My crawler has inspection covers for the clutch/brake assy under the machine (directly between the finals in the rear), yours is probably similar. Remove those and try to inspect the function of the band brakes (assuming you have band brakes and not discs?). If you do have typical band brakes over a clutch drum, then you should be able to observe the gripping action of the bands as the brakes are depressed (you'll need an assistant for this). There should also be an adjuster that will allow you to tighten the band so as to remove free play in the pedal system (does yours have excessive play/travel in the pedal?). Make sure this is adjusted properly so that when the pedal is depressed, each band cinches tightly around the drum and good pedal resistance is observed on both sides. There is also another set bolt on my crawler that helps remove slack/slop from the brake bands. Again, yours might be similar. You adjust it by screwing it in all the way until it contacts the band, and then back off a turn or two. Lastly check to ensure there is not a lot of grease or oil contamination on your brake pads or band/disc surfaces. Plus make sure you actually have good lining left and aren't down to metal to metal. Hope this helps, good luck
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