Hydraulic test port kit

   / Hydraulic test port kit #1  

racerboy832

Silver Member
Joined
Aug 15, 2010
Messages
231
Location
Connecticut
Tractor
Deutz Allis 5220 w FEL and Backhoe
On both of my mini excavators on the pressure side 90 degree fittings there is a allen plug. On my cheap micrometer it shows the outside diameter of the plug threads is .375 The 1/4-28 thread seems to match the pitch of the plug but not the diameter. 1/8 pipe seems too big. I am trying to come up with an adapter to check pressures. The machine in a Kubota KX 121-2 excavator. Anyone have any adaptor leads?
 
   / Hydraulic test port kit #2  
Could be BSPT 1/8- 28.
 
   / Hydraulic test port kit #3  
Does this plug have a seal washer or does it look more like a tapered set screw?

If seal washer could be 1/8 BSPP
 
   / Hydraulic test port kit
  • Thread Starter
#6  
It is a tapered thread with no washer. I am thinking its 1/8-BSPT The manual says 1/8 PT but when i google around, alot of people have run into this trying to put oil pressure gauges on their tractors. The gauges are NPT and the factory Hole is BSPT. All I can find is brass adapters but I am not sure about 3000+ PSI on Brass.
 
 
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