Congrats on being a two grease gun guy... (-: To fill my Wanner I give a half turn on the black handle at the bottom which disconnects it`s grip on the body of the gun, exposing a link or two of chain, which is connected to a piston in the guns cylinder/body.
Now holding the gun firmly you can pull on the chain which will draw the piston down the body of the gun against the strong internal spring.. using the slot either side of the central hole through which the chain runs, in order to lock any link you choose to hold the piston at any particular position of it`s stroke.
with the pressure off the piston you can unscrew the head off the other end of the gun`s body and if the grease now exposed is old and hard, best get your fingers dirty and get it out...
If required you can release the spring pressure to allow the piston to rise, using the chain to lock the piston at any particular height..
The idea of recharging the gun was in times past cans of grease had a tight fitting cover over the grease within the can which had a hole in it`s centre… The idea being that you could refil the gun with the head removed, by holding it in place over the hole and while pressing down on the gun you pull on the chain at the same time thus pressurising the grease and sucking it into the gun..
Whether you find this works for you or not...?
Me I tend yo just fill the gun with my fingers trying to trap as little air as possible.
Once full, just screw the head back on and release the chain links allowing the spring to pressurise the grease within the gun, hold the gun upside down and allow the loose chain links to fall back into the gun, replace the black handle.
Chances are that your gun will not pressurise the grease, as the pumping mechanism will have air in it due to the refilling process.
You should have two BLEED screws the one sticking out of the back of the head is an air bleed screw, if you unscrew that you will hear air escaping, followed by an ever growing worm of grease, best to shut that off once after perhaps 20mm of work has escaped..
The gun should now pump grease when the handle is operated..
The other bleed valve on top of the head is to release pressure should the gun be fixed to the nipple with pressure which can happen if there is some sort of blockage and you have pumped up the pressure to the max you can and no grease escapes from the suspension.... if you use the bleed valve thumb screw it will then allow you to disconnect the nozzle.
Hope this helps.
