I have had a Berkshire 736 for about a year. It has been a good runner and puller, until recently. It now goes forward in a slow and 'lurching' manner. In reverse, it operates normally. The e unit is clean and the wheels are clean and have no lateral movement. There is a lot of knowledge on this Forum and hopefully someone can offer suggestions to get it back to normal operation. Your comments are invited and appreciated. Thank you..
Ed
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The right rear axle bushing is always the one that wears out first(from forward operation), pushing the axle left, the right rear wheel into the frame, and the worm wheel off center.
Use one(or two or as needed) 671M-22 clips/retaining rings and snap them on to the drive axle to the left of the worm wheel. You want to have between half to the full width of a 671M-22 clip of end play in the axle for best performance. Keep the entire gearbox & axle lubed well with a synthetic HP grease(Lucas Red 'N' Tacky #2, eg.).
If you can source some clips with the same inner diameter as the 671M-22, but larger outer diameter, that would be beneficial. The last good tip I heard was to use an appropriate number of plastic bread closure clips(cut to be round) instead of the 671M-22. Very little friction with that method and they too slip right over the axle and stay on.
The perfect repair is to pull the back 4 wheels & 2 axles to replace the bushings properly, and that will require the right tools and wheel cups for proper quartering upon reassembly.
The nature of the worm drive acting on the armature could explain the directionality of the issue. This could be exasperated by worn bearings and shims introducing excess axial play into the armature shaft. Further, a stuck or worn brush/spring may also not be able to cope with the axial play.
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