Ransburg M90 Handguns 77073, 77132 - Manual (Page 25)

AH-99-01.3
M90 Handguns - Maintenance
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> Check all parts for damage or wear.
Replace those that are damaged or worn
with new parts.
> Inspect the sealing areas for wear at
the front and rear of the needle shaft. If
rough or uneven, replace it.
N O T E N O T E N O T E N O T E N O T E
Reassembly Reassembly Reassembly Reassembly Reassembly
1. Install a new Teflon seal and the valve
seat body into the chamber at the front
of the barrel. Use the nozzle wrench to
tighten.
2. Place the seal pusher onto the front
needle shaft section with the flat side
forward.
3. Push a new u-cup seal onto the front
needle shaft section with the cup portion
forward.
4. Place the seal spreader onto the front
needle shaft section with the flattest side
forward.
5. Screw the jam nut onto the threads of
the front needle shaft section until it
reaches the bottom of the threads.
Then screw the ball valve needle on by
hand until it bottoms on the threads of
the needle shaft. Using two 2.5mm
wrenches, tighten the jam nut against
the ball valve needle.
6. Fill the inner diameter of the packing
tube with dielectric grease. Insert the
needle shaft, rear section first, into the
packing tube. Rotate the needle shaft
while moving it back and forth inside the
packing tube until fully inserted.
7. With your finger, wipe the excess
grease from both ends of the packing
tube. Using the excess grease, apply a
thin film to the outer surface of the pack-
ing tube.
8. Apply a light film of dielectric grease to a
new o-ring and install it into the external
groove of the rear seal container.
9. Insert a new spring-loaded u-cup into
the seal container (with the concave
side facing outward). Use the rear seal
retainer to fully seat the u-cup.
10. Place the rear seal container subassem-
bly (with the u-cup seal rearward) onto
the back of the needle shaft and slide it
onto its sealing area.
11. Install the rear seal retainer onto the rear
needle shaft section.
12. Place the packing nut with the slots
rearward onto the rear needle shaft sec-
tion.
13. Screw the trigger adjustment nut onto
the rear needle shaft section with the
hexagon rearward and the spring re-
tainer with the hexagon forward. Do not
lock the hexagon nuts in place.
14. Install the needle shaft subassembly
into the packing chamber from the rear
of the barrel with the ball valve needle
forward.
15. Push the needle shaft subassembly for-
ward until the packing nut will engage
it’s mating thread in the barrel and screw
it into place by hand approximately 3
turns.
16. Tighten the packing nut using the spe-
cial multi-purpose wrench until there is a
firm resistance felt while moving the
needle shaft in and out. Then tighten it
an additional 1/16 to 1/8 turn.
> Be generous with the dielectric grease
when applying it to the packing tube and
needle shaft. This helps to remove air
voids from this chamber. DO NOT apply
so much grease that it creates an air lock
during assembly of the gun.
N O T E N O T E N O T E N O T E N O T E
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