Trelawny Single Scaler Heavy Duty, Operation And Maintenance Manual

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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 'O'Ring
(2), remove the spring (3), push out the
valve stem (4) and remove the 'O'Ring
(5). Check the valve 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 (17), the threads within the bore
of the bodies (23/24) and the tapers on
piston and cutter heads. The end caps
will require securing with a thread-
locking adhesive. It is good practice to
renew all ‘O’ Rings (2/5) and the brush
seals (22). Replace any parts showing
signs of wear; paying particular attention
to the small bore of the cylinder.
Head Assembly - Taper Fit (On-Site)
Thoroughly clean around area of cutter
head and piston. Remove all traces of
debris/oil from the taper on the piston
(20) and internal taper of the cutter head
(25/26/27) by cleaning with suitable oil
free solvent. Place the tool in a position
where the end cap is on a solid surface;
Select one of the cleaned new cutter
heads and place on to the taper of the
piston. Using a soft-faced hammer
deliver a sharp blow to the cutter head.
Head Assembly - taper fit (Workshop)
Remove all traces of oil and dirt etc, from
the taper diameter on the piston (20) and
cutter head (25/26/27) by cleaning with
suitable oil free solvent. Fit the piston
into the cylinder (21) as shown in the
service layout. Place the assembly onto
a solid surface; fit a new brush-seal (22)
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, replacements will be
required.
One Piece Piston and Piston/Cylinder
assembly (Workshop)
Lubricate the piston (20/33) and cylinder
bore (21/29) and push the piston into the
cylinder bore.
Excessive operator pressure will not
improve the tool efficiency but will
cause premature tool failure and
operator fatigue.
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 (17) has become unscrewed.
Maintenance
Maintenance must only be carried out by
a competent person. Disconnect the
tool from the air supply before
carrying 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 (25/26/27)
facing uppermost. Place the head
removal washer (32) between the cutter
head and the body; insert the removal
pin (31), 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.
One Piece Piston & Piston/Cylinder
Assembly removal (Workshop)
Hold the scaler body (24) in a vice, using
the flats provided and with the end cap
uppermost. On triple scalers, secure the
tool in a vice, clamping on all three cutter
heads (On one piece pistons take care
not to clamp on the ground surfaces).
Unscrew the end cap (17). Remove
spring cap (19) and spring (18) 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 (32) between the cutter
head and the cylinder; insert the removal
pin (31), 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 servicing (Workshop)
Clamp the handle (10) assembly firmly in
a soft face jawed vice (valve body end)
throttle lever upper most. Using a 3mm
diameter pin punch, remove the throttle
Lay the tool on a bench with the body
(23/24) on its side and Insert the cylinder
assembly into the body.
Valve Body assembly (Workshop)
Clamp the handle (10) assembly firmly in
a soft faced vice (valve body end), 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.
FINAL ASSEMBLY (Workshop)
Assemble the end cap (17), fit spring
(18) into the end cap and fit spring cap
(19) into the end cap as shown in the
service layout.
Select as required, a piston/cutterhead,
insert into the body (23/24) and apply a
few drops of air tool lubricant to the top
of the piston(s).
Hold the handle (10) in a soft faced vice
ensuring the screw cap threads are
uppermost.
Remove all traces of oil from the
screwed cap threads and 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 torque 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.
Machinery Directive
Information
This machine has been designed and
produced in accordance with the
following directives: 2006/42/EC
Machinery Directive
and applicable harmonised standard:
EN ISO 1 1148-4:2010
Trelawny tools are thoroughly tested
under specified conditions in accordance
with applicable internationally recognised
standards.
MAINTENANCE