When I say squash, what we’re doing is we’re pushing the packings into the cylinder. They’re flaring out onto the piston to ensure that we get appropriate seal.
Because as you’ll see further, there is the sides and seals by five in the top and the need compression to make sure they seal on the piston and enable that the chamber pressure is maintained within the chamber and not exhausting at the top.
So, the castellated nut, in this instance, may need adjusting; if it was leaking. What I would do then is, I would isolate the air off the pump which is the valve on the back.
Three-way valve – (1,2..) isolated the pressure.
Also, what I’ll do is because the air matter won’t actuate, I’ll open this valve here to dump any pressure.
Therefore, there’s no pressure. This system is no longer pressurized.
That’s why that valve must work.
So, I open that valve and then with a c-section spanner, I’ll place the c-section spanner on the packings on the castellated nut.
Now, this top nut here squashes the packings down into the cylinder.
What I’ll do is I’ll adjust it slightly tightening.
What I don’t want you to do is put a C-section spanner on there and bash it because if you overtighten those packings, you actually elongate or carve out the wall — the integral wall of the piston itself.
Because you’ll have the pack is too tight or ultimately the air mode will stall because it can’t cope with the torque that you’ve applied on those packings
This is an indicator for lubrication.
This is an indicator for packing where.