MAINTENANCE
Never allow the tool to run continuously
whilst not in contact with the surface
being prepared.
Please be aware: that this tool will
reduce in power or stop working if the
end cap (20) has become unscrewed.
Maintenan e
Maintenance must only be carried out by
a competent person.
Dis onne t the tool from the air
supply before arrying out any of the
following operations.
Clean all debris from the exterior of the
tool.
Head removal - Taper Fit (On site)
Lay the scaling hammer on a solid
surface with the cutter head (21) facing
uppermost. Place the head removal
washer (23) between the cutter head and
the body; insert the removal pin (22), into
cutter head hole (refer to diagram for
pictorial illustration). Wearing safety
glasses, using a medium size hammer
give a sharp blow to the head of the pin,
which will release the cutter head from
the piston.
One Pie e Piston & Piston/Cylinder
Assembly removal (Workshop)
Hold the single scaler body (14) in a
vice, using the flats provided and with
the end cap uppermost. Unscrew the
end cap (20). Remove spring cap (18)
and spring (19) from the end cap. From
the bottom of the body, push up the
cutter head to remove the piston
assembly.
Head removal - Taper Fit (Workshop)
Lay the piston and cylinder assembly on
a solid surface with the cutter head
facing uppermost. Place the head
removal washer (23) between the cutter
head and the cylinder; insert the removal
pin (22), into cutter head hole (refer to
diagram for pictorial illustration).
Wearing safety glasses and using a
medium size hammer, give a sharp blow
to the head of the pin, which will release
the cutter head from the piston.
Inspect all components for wear, replace
as necessary.
Valve body servi ing (Workshop)
Clamp the assembly firmly in a soft face
jawed vice, using the flats provided on
the valve body, with the throttle lever
upper most.
Using a 3mm diameter pin punch,
remove the throttle lever roll pin (8), and
then remove the throttle lever (7).
Rotate the tool 180 degrees in the vice to
access the valve. Unscrew the valve cap
(1) using a screwdriver, check the valve
cap’s 'O'Ring (2). Remove the spring (3).
Remove the valve stem (4) and the valve
seat 'O' Ring (5). Check the valve stem
and 'O'Ring for wear.
Assembly (Workshop)
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
end cap (20), the threads within the bore
of the body (14) and also the taper of the
piston and cutter head. The end caps will
re uire securing with a thread-locking
adhesive. It is good practice to renew the
O’ Rings (2 & 5) and the brush seal (15).
Replace any parts showing signs of
wear; paying particular attention to the
small bore of the cylinder.
Valve Body assembly (Workshop)
Clamp the assembly firmly in a soft face
jawed vice, using the flats provided on
the valve body, insert new valve stem
'O'Ring (5) into valve body (6), followed
by the valve stem (4), spring (3), then the
valve cap (1) complete with its O'Ring
(2), tighten the valve cap with a
screwdriver. Rotate assembly 180
degrees in vice. Using a 3mm diameter
pin punch locate and align the throttle
lever (7) in position, then drive in the
throttle lever roll pin (8) into the pin
location.
Head Assembly - Taper Fit (On-Site)
Thoroughly clean the cutter head and
piston. Remove all traces of debris/oil
from the taper on the piston (17) and the
internal taper of the cutter head (21) by
cleaning with suitable oil free solvent.
Place the tool in a position where the
end cap is on a solid surface; Fit a new
and cleaned cutter head and place on to
the taper of the piston. Using a soft-
faced hammer deliver a sharp blow to
the cutter head. (Using a hard faced
hammer may cause the tungsten carbide
inserts to chip or shatter which could
cause a serious injury to you).
Head Assembly - taper fit (Workshop)
Remove all traces of oil and dirt etc, from
the taper on the piston (17) and cutter
head (21) by cleaning with suitable oil
free solvent. Fit the piston into the
cylinder (16) as shown in the service
layout.
Flexible Conne tor
If the Flexible Connector (12) re uires
replacement, return the tool to you local
distributor who will arrange for a new
connector to be fitted. These connectors
are fitted with uni ue retaining clips (13)
and a special machine is re uired to fit
them. Do not replace with a similar hose
or Jubilee type clips, this could be
dangerous to the operator and will not
produce the same vibration reduction
characteristics.
Place the assembly onto a solid surface;
fit a new brush-seal (15) over the piston
and into the recess of the cylinder.
Select one of the cleaned new cutter
head and place on to the taper of the
piston.
Using a soft-faced hammer deliver a
sharp blow to the cutter head.
Note: If you are re-fitting a used cutter
head to the piston it is essential that the
internal diameter of the cutter head is re-
surfaced using a medium grade of emery
cloth - this will ensure a good fit between
cutter head and piston, do not use
adhesive of any description on the taper.
If the taper has expanded to much on
the old cutter heads, they may not stay
on the piston, and replacements will be
re uired.
One Pie e Piston and Piston/Cylinder
assembly (Workshop)
Lubricate the piston (17a) and cylinder
bore(16a) and push the piston into the
cylinder bore.
FINAL ASSEMBLY
Both types (Workshop)
Lay the tool on a bench with the body
(14) on its side and insert the cylinder
assembly into the body and apply a few
drops of air tool lubricant to the top of the
piston.
Hold the body (14) in a soft fa ed vice
ensuring the screw cap threads are
uppermost.
Assemble the end cap (20), fit spring
(19) into the recess in the end cap and
then fit spring cap (18) into the end cap
as shown in the service layout.
Remove all traces of oil from the end cap
threads and the threads of the body by
cleaning with suitable oil free solvent.
Apply a bead of Loctite 243 sealant to
the first 3 threads of the end cap.
Screw end cap assembly into the body
until finger tight and using a suitable
spanner tor ue down to 55N.m.
(40 lbs.ft).
DISPOSAL
When the tool and its accessories are
taken out of service for disposal, it is
recommended that: -
They are rendered unusable to prevent
improper re-use.
They are dismantled into component
form, segregated according to material
composition and disposed of using waste
recycling processes specified by local
regulations.
