PAGE 8
SF11ex DECK hammer
ASSEMBLY
Ensure all parts are clean and that all internal parts have a film
of air tool oil, unless specified otherwise. Avoid lubricating oil
contaminating the threads of the body, and the screw cap.
These will require securing with a thread-locking adhesive.
Replace any parts that show signs of wear. If the tool has been
fully serviced it is recommended to change anti-vibration
pads (18) and (21).
Taper Fit Head Pistons
Ensure that all traces of oil/grease are removed from the new
cutter head taper and piston taper using a suitable oil free
solvent. Fit the piston into the cylinder as shown in the service
layout. Fit a new brush seal into the cylinder recess. Select a
cutter head and place on to the taper of the piston. Place the
assembly on to a solid flat surface, and with the cutter head
uppermost, deliver a sharp blow with a soft faced hammer to
seat the cutter head onto the piston taper. (The use of a hard
faced hammer will damage the cutter head).
Assembly of Scaling Head
Removal all traces of oil from screwed cap and cylinder block
threads. Select a cutter head/piston/cylinder/brush seal
assembly and apply a few drops of air tool oil to the top of the
piston and fit into the body, repeat with the other assemblies.
Fit spring (26) into a screwed cap (25) and fit spring cap (27)
into screwed cap, as shown in the service layout. Apply a
small bead of Loctite 243 (Threadloc) or its equivalent to the
first two threads of the spring cap and screw down by hand,
fully tighten the screwed cap using a suitable spanner, to a
torque of 81.5 Nm (60 lb/ ft).
Sub-frame to Scaling Head
Align mounting holes on sub-frame (22) with anti-vibration pad
(21) studs and fit as shown in service layout. Fit washer (20)
and locknut (19) to both studs and fasten both nuts down to a
torque of 40lb ft.
Wheel to Sub-frame
Slide wheel (23) onto sub-frame axle, fit washer (20) and
insert a new split pin (24) into the hole. Separate legs on split
pin and bend round with pliers or otherwise. Repeat on the
other wheel.
MAINTENANCE
Disconnect the tool from the air supply before carrying out
any of the following operations.
Dismantling
Clean all debris from the exterior of the tool.
Head Removal – Taper Fit Pistons
Lay the machine down on its side. Unscrew and remove
screwed cap (25). Remove spring cap (27) and spring (26).
From the bottom of the unit push on the cutter head and
remove the piston assembly. Repeat for all other cylinders.
Place the head removal washer between the cutter head and
the cylinder, place cylinder assembly on a flat solid surface
with the cutter head upper most, insert the removal pin into
the cutter head hole so that it rests on the end of the piston.
Wearing safety glasses, deliver a sharp blow to the head of
the pin with a medium sized hammer and the cutter head will
be released from the piston.
Piston and Cylinder removal
Unscrew and remove screwed cap (25). Remove spring cap
(27) and spring (26) from the bottom of the scaling head push
up and remove the piston (30) cylinder (28) and brush seal
(29) as an assembly. Repeat for all other cylinders.
Wheel removal
Lay tool on side. Close the split pin (24) and remove the pin,
remove washer (20) and slide the wheel (23) from the axle.
Handle Assembly from Sub-Frame
Remove locking pin (11) to free handle. Lay tool down with
hoses uppermost. Unscrew the connector on the hose (7)
from the adaptor nearest to the scaling head. Select two
15/16” A/F spanners to fit bolt (16) and nut (15). Unscrew and
remove both nut (15) and washer (17), withdraw bolt (16) and
washer (17).
Sub-Frame from Scaling Head
Repeat the above, then select a 3/4” A/F spanner and unlock
nut (19) unscrew nut and remove both nut and washer (20).
Repeat for other side.
Ball Valve from mounting
Unscrew hose fittings from ball valve (6) unscrew 4 nuts (5)
and remove u-bolts (3) and mounting brackets (4).
Lifting plate from Handle Assembly
Select a 13mm A/F spanner to suit nut (8) and a 6mm A/F
Allen Key to suit cap head screw (9) and unlock screw (9).
Remove washer (8a) and repeat for other screw.
VERY IMPORTANT
Only a competent person, in a suitably equipped
workshop, must carry out maintenance.
VERY IMPORTANT
Disconnect the tool from the air supply before carrying out
any of the following operations.
