Roosa Master JDB4 help

/ Roosa Master JDB4 help #1  

Ster1

Bronze Member
Joined
Oct 13, 2022
Messages
56
Tractor
Mitsubishi
Hi folks,
I'm working on my 401 that followed me home. The injection pump stopped injecting, so I started digging into it and found an extremely dirty fuel system and extremely dirty pump. I have the JDB4 all tore apart, and I think it's salvageable, but I ran into a problem, and I'm looking for help. I'm cleaning up the pump head, and I took out the 3 little screws / passage plugs and a small rod fell out. I wasn't watching for it, and it just came out when I was playing with the pump. I will try to attach a pic where I have labeled the 3 holes A B and C. My hope is that someone might know which screw that little rod goes with. It fits in either A or B (c is too small). The rod is toward the top of the pic. It's a little blurry but it's not much to see. It looks like a finish nail that's about 1 1/4" long. If anyone knows where it goes, I'd appreciate knowing. Furthermore, I'd extra appreciate telling me what the heck a little rod is doing in there in the first place. Thanks a bunch!
 

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/ Roosa Master JDB4 help
  • Thread Starter
#3  
Thank you!
 
/ Roosa Master JDB4 help #4  
On a JDB there’s 2 wires..
1 is a vent wire and the other is a keeper ..
The vent wire usually gets stuck but the retainer is free..
Let me know what ur measurement is if u haven’t put it back together yet..
 
/ Roosa Master JDB4 help
  • Thread Starter
#5  
On a JDB there’s 2 wires..
1 is a vent wire and the other is a keeper ..
The vent wire usually gets stuck but the retainer is free..
Let me know what ur measurement is if u haven’t put it back together yet..
Hey there! I'm the one you've been helping over on heavy equipment forums, so I won't duplicate here. You da man.

Here's the link to our whole conversation, in case anyone wants to read it

 

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