I kite a lot and use the same North pump that i ordered with my 4 kites (2011)
It does service easily by unscrewing the cap of pump
North supplies with pump a lubricant
Must have pumped my Rebels over 150 times with it and serviced my pump easily about 4 times
My pump still works great and i pump 90% of the time at beach
By the way i got 2 pumps originally for my kites and one is still brand new in the box untouched
Those are the North Maintenance Instructions as it appears on their pump:
Unscrew the cap and pull it out together with the piston.
Clean the inner cylinder and the piston and take care that the sealing rings are always lubricated.
For re-assembly please place the piston carefully into the cylinder.
Lube it up and have fun kiting