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Well, not sure I actually solved the problem! I was ready to start taking things apart, with a focus on upper and lower shaft bearings, per some good advise I had from a very knowledgeable chap on this site. Anyway, I decided to change the oil and put an ISO 100 oil in the hydraulics (SAE 30); I did that, and so far, there has been a significant improvement in the steering. The previous owner had an ISO 46 hydraulic oil in the system, which he had subsequently changed to a 10W30. The straight 30 is of course heavier at operating temp, which for me tends to be cool; in fact, since most of my work is in the woods in winter, the 10W30 hydraulic oil was operating as a 10 weight. The downside of the SAE 30 is with the cold, the steering can be a bit stiff at the cold temps.
I am keeping my fingers crossed that my steering continues to work as it now does, in which case I will not do the teardown.

420a belarus steering problem
Belarus
Replies 4 Post by p15cwbm

Thank you Cowrider!
When I unscrew the cap, and pull the plunger, will diesel start to freeflow from the booster pump? I do have a valve at the tank although I am not sure it will work; it is very stiff and I am hesitant to force it for fear of it breaking off. It actually seems to be rusted into place at the tank!
Regards,
Wayne

Belarus 420A - Problems bleeding Injection Pump
Belarus
Replies 4 Post by p15cwbm

I am having problems bleeding the injection pump, and injector lines. I believe the air is getting into the system at the primer pump. Any experiences with this primer (booster) pump? When I pump, the diesel squirts up along the shaft, and pressure will not build. If diesel gets out, I am concerned that air gets in along the same path. The bleed plug above this pump does not fill; rather, I continue getting air and a bit of diesel. Most of the diesel comes out at the plunger shaft, as noted above. Primer pump may need to be rebuilt?

Belarus 420A - Problems bleeding Injection Pump
Belarus
Replies 1 Post by p15cwbm

Thanks for the quick reply! I will check out the Yahoo site you have noted. The hydraulic fluid currently on this tractor is AW32, but I am not sure if this is adequate for the power steering; as far as I can tell, the steering and general hydraulics work off the same pump. The previous owner did change the pump which I believe failed due to the 32 oil in warm weather i.e. not heavy enough. I am into cold weather now so the 32 may be ok but I just want to determine what the original spec was for the system. Thanks again and I will go to the Yahoo site.

Lubricants
Belarus
Replies 3 Post by p15cwbm