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Volvo EC-140C - what tool to remove this piston lock nut

just-a-mechanic

just-a-mechanic

Well-Known Member
Joined
Sep 20, 2018
Messages
62
Location
Alabama
As the title says what is the correct tool to remove this lock nut from my boom hydraulic cylinder?

IMG_0453.png

The outside dimension is 75 mm. The grooves are 5 mm deep. Across the flats the interior dimension is 65 mm.

What is the proper term for this nut?

Lock nut
Spindle nut
Groove nut

I think I may have to build something. A spanner wrench can not hold the torque required for this, I don’t believe.
 
uffex

uffex

Senior Member
Joined
Jan 23, 2012
Messages
4,464
Location
Lincoln UK
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Admin
Good day
Example attached one clockwise the other counterclockwise.
Kind regards
Uffex
1709585038753.png
 
uffex

uffex

Senior Member
Joined
Jan 23, 2012
Messages
4,464
Location
Lincoln UK
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Good day
That is an example as you did not tell me which cylinder, but its bound to be dammed tight. I do not have any illustration of the tool, but it would need to be substantial and well-made. I will try to find the tool maybe FunWithFuel can help out.
Kind regards
Uffex
 
uffex

uffex

Senior Member
Joined
Jan 23, 2012
Messages
4,464
Location
Lincoln UK
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Admin
Good day
I have checked that is the correct spec for the boom cylinders.
Kind regards
Uffex
 
D

Delmer

Senior Member
Joined
Jan 3, 2013
Messages
8,891
Location
WI
I've built tools to take off gland nuts with similar notches. A 2' piece of pipe to fit the outside diameter, then weld in four pieces of key stock, then apply leverage to the free end. In this case you don't need as deep a socket, so deep enough to reach the inner nut, then weld a plate to one end and a pipe to slide a bar into for leverage.
 
DD57

DD57

Member
Joined
Dec 8, 2023
Messages
11
Location
Pennsylvania
If you get a tool, and you're trying to loosen the nuts,and it won't go,try heating the nuts with a torch. That will loosen the loctite if there is any in there .Good Luck
 
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