Murray 3904 Steering Sector Hunt

Part number is 21692.  Found a listing for it but it is sold out.  Recording this hear to make the search easier in the future. The pinion 21492 is also with a bracket.

This is the DR Trimmer   Model 64020 acquired in July of 2019.   Unlike most of the other power equipment I use this one was purchased.   It uses the same engine as the trash picked push mower we use around the yard.  It has its own story which I will relate in another post.

Had not used it much as I did not have string for it.   Purchased a spool of  (fill this in)  early summer.  The thing worked for a few hours then stopped.   The carb had the white deposits. Cleaned the carb but used one I had cleaned and stored earlier, looked identical.  But this only got another hour out of it.   Cleaned the jet, fuel tank and installed one of the clear plastic filters with the paper filter element.  

That worked up till yesterday.   It just stopped while running but not in use.   Figured it was the fuel filter.  Pulled off the air cleaner and it was solid with green plant dust.  They may have been the cause.   But I had already loosened the nut on the fuel bowl so I swapped out the jet for one I recently clean.

What was wrong?  Most likely the poor thing was starved for air.   Either that or the jet plugged which is possible but unlikely with the paper fuel filter.

Another problem with this machine is that it throws its strings.   The string is installed as shown in the following image.

The strings are supposed to be cut to 23 inches.   I found that making them a bit longer and then tying a knot in the strings where they exit the mow head generally keeps them in place up till everything up to and including the knot is gone.

It could well be that DR Trimmer brand strings/line will work better.  

Update

Seems I have been ignoring this blog.   The foundry stuff have moved to https://nmlfoundry.blogspot.com.

It is mid August 2021 and the weeds on our 2 acres have gotten away from me.

The DYT4000 has a blow head gasket since last year.
Have the DR Trimmer working but stops after a while seems to be overheating.   May take it down to the car wash and clean the fins.  They are open but may have a coating of weed goo that is insulating.

The BX has several small hydraulic leaks but they add up and at $60 the hydraulic fluid gets expensive.  A while back I started changing the old leaky quick connectors for the loader with new ones that are incompatible with the old.  Still have one connector that has not come loose.  Thinking maybe cut slits in it with the dremel and peel it off.  But it also looks like the hose end where the quick connector screws on is bad.  So will try to get it off on the other end and replace the hose too.

The old push mower has not been working.   Spark problem.   Thinking next step is to pull the new coil again and file the coil mounting posts down to new metal.   

Update:
The DYT4000 head gasket was good.  Should have done a leak down test.  Now it does need a head gasket.  Have 2 gaskets in stock but are the wrong number.   Not sure what that is about.

On the BX replaced the 3 steel lines that connect to the loader.  Removed the line with the stuck connector and put it in the vice.    There is still one connector to chance on the loader.  It is still leaking under the floor pan.  Oil on the radiator screen.
  
The mower works great after freshening up the coil mount posts!

Briggs 8HP Gear Reduction 170452 0549 01

 I had two digits transposed in the original post for this engine.  170542 instead of 170452.

17 ci
0 series
4 Horizontal, Flow Jet, Belt drive   ... well horizontal for sure
5 Gear reduction 6:1
9 Mechanical starter

Link to reference
Numerical Number System

Thinking about putting this engine on the sand muller.
Say we run the engine a 2000 RPM
The 6:1 output is 333 RPM
A 10:1 right angle gearbox would result in 33 RPM which is about right IIRC.  Need to look.
But I don't see an affordable gearbox.
So a mule drive would do the right angle thing.     Maybe some of the reduction too.
Need to look back at the earlier work I did on the muller in the Foundry blog.
Not seeing much advantage as complexity is similar.
Well at least I got the model number figured out.

It a gas engine is the choice a vertical shaft engine would be the way to go even if it needs one more belt.  Not fond of using a mule drive.  And 8 HP is over kill.   There is a small electric start mower in the junk that might be a better choice.