|Problems with control valves are few and far between but |
certainly within the realm of possibility.
I do not suspect the pump because you do not complain of a lack
of ground speed going forward. Your complaint seems to be
when reversing the tractor only. The pump has no idea which
way the tractor is heading. It just pumps oil or it does not pump
oil. It's a black or white situation.
The drive motor does know about direction but the usual
complaint is that the tractor will back up quite well but lacks
power going forward. This is due to the tractor travelling
forward 90 percent of the time or more, thus putting more wear
and tear on certain parts that are rotating while travelling
forward. For these reasons, I do not suspect the drive motor.
The spool in the control valve may be damaged. The only way to
know for certain is to remove that valve, dismantle it and have it
inspected by a knowledgeable person. These valves can be
commonly found on e-Bay for very reasonable prices. You could
also contact antiquesetc on MTF's CCI forum because Ken parts
out tractors and often has these valves.
You already realize the genius of the Case tractor's
uncomplicated design, so there is no reason to relegate your 442
to that of a parts tractor when the problem can be solved rather
easily and inexpensively. The Kohler is probably the easiest and
least costly engine to rebuild and that needs to be done whether
there is a minor issue with the hydraulics or not.
Take a peek at the 442 recently restored by Doug Wartil over at
the Case, Colt, Ingersoll forum. Your 442 could end up looking
just like his and I'm sure that Doug would be pleased to give you
any assistance you may need.
I realize that you may be slightly frustrated at the moment but
don't allow yourself to be influenced by the negativity of a
couple of people on this forum. Every forum has members like
this. If you truly believe that the linkage is tight, then why not
buy a used valve, install it and refill the system with clean oil?
That might be the quickest way to put your mind at ease so you
can get on with the restoration process.