
7
to unscrew the Driving Blade Jam Nut and remove it.
Hold the Piston from turning while unscrewing the Jam
Nut by holding the piston hex with a 1-1/8” box wrench
(Part #: 09-445-29768).
6. Push out the 1/4" diameter blade retaining Dowel Pin
and remove the broken Driving Blade stub.
7. Install a new Driving Blade in the slot and replace
the Dowel Pin. Screw on the retaining Jam Nut using
the same tools. If the Jam Nut becomes worn and loose
after frequent removals, it should be replaced.
8. Check the fit, there should be some sideways
movement between the Driving Blade and the Jam Nut
assembly. This is desirable and helps the blade to align
itself with the mating parts.
9. Reassemble the components. Be sure to align
the Driving Blade with the slot in the Adapter Foot
Assembly, it goes in only one way.
DRIVING BLADE ASSEMBLY REMOVAL:
1. Disconnect the air supply.
2. Remove Rubber Plunger Cap (#18).
3. Unscrew & remove Body Cap (#2).
4. Push Safety Yoke (#26) aside and unscrew the three
10-32 cap screws holding the Plunger (#13) to the
Return Cylinder (#12).
5. Pull the Plunger up and out of the Nailer Body (#1)
cavity.
6. Remove the Return Cylinder 0 Ring Gasket (#34)
located on the top of the Return Cylinder under the
Plunger.
7. Turn the Nailer over and remove the four cap screws
(#48), that fasten the Adapter Foot and Nail Channel
Assembly to the Nailer Body and lift the Assembly off
the Body.
8. Remove the Rubber Bumper (#31).
9. Pull the Driving Blade Assembly out of the Nailer
Body by pulling on the Driving Blade.
10. Hold the Piston Rod (#10) with an 11/16" socket
over its hex end opposite the Piston. Do not use pliers
or a vise anywhere on the metal parts, they can
damage the sealing surfaces.
11. Use box wrenches to remove the 5/8-18 Jam Nut
(#49). Remove the Dowel Pin (#42) and Driving
Blade (#17).
12. Unscrew the Piston from the Piston Rod using
box wrenches and separate the Piston, Piston Rod
and Return Cylinder.
SEAL REPLACEMENT:
There are 7 seals that may require replacement.
We recommend that you have your POWERNAIL
Dealer replace the Seals.
SEAL KIT:
You may choose to buy a Seal Replacement Kit
and replace the seals yourself. It is good practice to
replace all seals at one time regardless if only one
seal needs replacement.
SEAL DESCRIPTION & NUMBER:
1. Piston U cup Lip Seal (#19)
2. Return Cylinder U cup Lip Seal (#20)
3. Piston Rod U cup Lip Seal (#21)
4. Rubber Seat (#30)
5. Plunger Seal Set (#32)
6. Plunger Wiper Seal (#33)
7. Return Cylinder 0 Ring Gasket (#34)
To change Seals follow these procedures. Be sure
the air line is disconnected from the Nailer first
before making any repairs. Consult the illustration
for the name and location of the following
component parts.
TO REPLACE THE SEALS:
Plunger Seal Set (#32):
1. Remove the Teflon®Seal and its O-ring expander
from the Plunger groove using a bent paper clip or
pick. Be sure not to scratch the inside walls of the
seal groove with the wire hook.
2. Clean out the seal groove. Place a new O-ring
into the seal groove by stretching it over the Plunger
body. Make sure the O-ring is not twisted in the
groove. Place a new Teflon®Seal Ring into the seal
groove over the O-ring.
OPERATION, continued...