• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Another Cummins PT (PTG-VS) question

S

Shane Kennedy

Member
Joined
May 10, 2019
Messages
6
Location
Ireland
Can anyone advise: Cummins LTA10 fuel pressure pump PTG-VS, I may have lost some parts out of the VS governor, but 1) I'm not sure what, or how the thing is supposed to assemble, 2) I don't actually use the VS function anyway. Is there a simple way for me to block or bypass the VS governor assembly, or can anyone send or link me to an exploded diagram ? I had dismantled the pump to find why it wasn't pushing pressure, and found that the pressure regulator was stuck after a year idle.
Thanks-in-advance
 
S

Shane Kennedy

Member
Joined
May 10, 2019
Messages
6
Location
Ireland
Got it. Watching the simulation, it is the "weight assist plunger", and I have lost the spring that goes behind it. Thanks for the pointers. An advice on how to check the shims are right ?
 
S

Shane Kennedy

Member
Joined
May 10, 2019
Messages
6
Location
Ireland
I am still in trouble with my PTG-VS pump. Fuel is still not getting through to the shutoff valve, and there is a fuel return port on the top of the gear-pump which is giving substantial pressure when the pump is rotated. If I remove the AFC piston, and remove the plug that was partially hidden under the AFC cover, I get free fuel flow that far, and the pressure is relieved from the return line. I have failed to find a mesh/magnet strainer anywhere, was that left out of the VS pumps ?
 
Truck Shop

Truck Shop

Senior Member
Joined
Dec 7, 2015
Messages
16,992
Location
WWW.
I will only say this once, unless you have major knowledge about a PT pump and a test stand and know how to operate it plus a full book of cpl calibrations you are shooting in the dark.
 
S

Shane Kennedy

Member
Joined
May 10, 2019
Messages
6
Location
Ireland
It wont be the first time that i have "shot in the dark" and hit the bullseye. I have quite a reputation for an intuitive understanding of how things work. I will get there in this case too. I am not adjusting anything. I don't want to spend money when I may decide to replace the whole engine (in a boat) anyway.
 
kshansen

kshansen

Senior Member
Joined
Mar 11, 2012
Messages
11,165
Location
Central New York, USA
Occupation
Retired Mechanic in Stone Quarry
Well good luck! Just remember to have some way to kill that engine when you try to restart it. A plate of steel over the air intake works good just don't get fingers in the way or they will be calling you Lefty!

Diesels like to take off fast if some little part is out of place in the fuel system!
 
You must log in or register to reply here.
Top