It is good practice to renew all
O'Rings and especially the locknut
wiper seal O‟Ring that is located
inside the lock nut (17).
Replace any parts showing signs of
wear; paying particular attention to
the small bore of the cylinder.
Prior to assembly, inspect the centre
shaft of the body, if there is any sign
of corrosion lightly polish out any
markings with fine emery cloth.
Fit one of the O'Rings (17) over the
centre shaft to act as a cushion.
Fit a new O‟Ring seal (17) into the
locknut (16) and lubricate the seal
(17) using general-purpose bearing
grease.
Slide the locknut onto the centre
shaft, followed by the tab washer
(16A) with the tab towards the
spring. Liberally grease the centre
shaft prior to fitting the spring (15).
Then insert a 4mm rod/bar through
hole in the centre shaft.
Rotate the spring (15) until there is
sufficient clearance to fit the thrust
ring (13).
Fit a new circlip (14). Relieve the
tension in the spring by rotating
approximately two turns in the
opposite direction. Check that the
new circlip (14) is seated correctly
and is secure before removing the
4mm pin.
Piston and Cylinder Assembly.
(Threaded Piston)
Fit a new wiper seal (24) and
O'Rings (21) and (22) to the
appropriate small and large grooves
on the cylinder (23).
Fit a new O'Ring (20) to the piston
(19) and insert into the cylinder (23).
Screw on the compactor foot (25) or
Scabbler head until it butts up
against shoulder of piston (19).
Hold in vice vertically, gripping on
compactor foot (25) or Scabbler
head on the spanner flats.
Fully secure using a suitable wrench
on the piston‟s (19) spanner flats to
a torque of 500lbs/ft (678Nm).
OPERATION / MAINTENANCE
Hold body assembly (18) on the flats
provided and unscrew the cylinder
(23).
(Threaded Piston)
Hold the Compactor foot (25) or
Scabbler head (27) securely in a
vice, then using a 1¼” (32mm)
spanner on the piston flats, unscrew
the compactor foot and remove the
piston (19) from the cylinder (23).
Remove the piston O' Ring (20) and
remove cylinder wiper seal (24) and
O' Rings (21) and (22).
(Pin fit Piston)
Hold the compactor foot or Scabbler
head (25) securely in a vice, then
using a 12mm punch drive out the
spiral retaining pin (30) and remove
the compactor foot or Scabbler
head, remove the piston (19) from
the cylinder (23). Remove cylinder
wiper seal (24) and O' Rings (21)
and (22).
Valve Body Servicing
Hold handle tube (11) in vice,
approximately six inches (150mm)
away from the valve assembly and
with the locking rivet uppermost,
knock out the rivet using a sharp
chisel. Looking as from the top of
the handle, using a soft-faced
hammer, strike the air inlet boss
downward in an anti clockwise
direction and unscrew from handle
tube (11).
This may need a sharp blow initially
to break the bond. Remove the
handle tube (11) from the vice.
Secure the valve body assembly in
the vice, holding on the main body.
Using a suitable spanner unscrew
the adapter (1) from the valve body,
remove the spring (2) and retrieve
the valve stem (6) with its O‟Rings
(3) and (26). Using a 8mm punch,
drive out the throttle lever pivot pin
and withdraw the throttle lever (5).
ASSEMBLY
Before any assembly takes place,
ensure all parts are clean and have
a film of air tool oil lubrication unless
otherwise stated.
Avoid lubricating oil or grease
contaminating the threads of the
cylinder (23), tube handle lock nut
(17), and handle valve body (4).
These will require securing with a
thread-locking adhesive.
Ensure that the threads of the
cylinder and body are clean and free
of oil; apply a bead of Loctite 243 or
similar to the first few threads of the
cylinder (19).
Hold the body assembly in a vice on
the flats provided and screw cylinder
(23) in by hand, using a suitable
wrench on the spanner flats tighten
to a recommended torque of 135Nm
(100 lbs/ft).
Piston and Cylinder Assembly.
(Pin fit Piston)
Fit a new wiper seal (24) and both
O' rings (21) and (22) to the
appropriate small and large grooves
on the cylinder (23).
Insert the piston (19) into the
cylinder .
Fit the compactor foot (25) or
Scabbler head until it butts up
against the piston.
Align the holes in the piston and
compactor foot or Scabbler head.
A 7/16” Allen Key is a good fit for this
purpose or use a suitable piece of
wooden dowelling.
Hold the spiral pin (30) with a pair of
pliers to avoid hitting the fingers, and
then using a hammer, drive in the
spiral pin (30) fully to secure the
compactor foot or Scabbler head.
Ensure that the threads of the
cylinder and body (18) are clean and
free of oil; apply a bead of Loctite
243 or similar to the first few threads
of the cylinder.
Hold the body in a vice on the flats
provided and screw cylinder in by
hand, using a suitable wrench on the
spanner flats on the cylinder (12)
tighten to a recommended torque of
15Nm (100 lbs/ft).
Handle/Valve Body Assembly
Apply general-purpose grease to the
valve stem, insert valve stem (6) with
its O'Ring (3) into valve guide
followed by the spring (2).
Screw in adaptor (1) by hand and
using a 27mm (1 1/16”) spanner fully
tighten.
