IR IR40BV Exploitation Et Entretien page 51

DISASSEMBLING THE IR40BV AND IR40BS PAVING BREAKER
GENERAL INSTRUCTIONS
• Clean the breaker outer surface.
• Do not disassemble the breaker any further than
necessary to replace or repair damaged or worn
parts.
• Whenever grasping a breaker or a part in a vice,
always use leather or copper -covered vice jaws to
protect the surface of the part and help pre vent
distortion. Take extra care with threaded parts
and housings.
• Do not remove any part that is a press fi t in or
on a subassembly unless the removal of the part
is necessary for repairs or replacement.
• Do not disassemble the breaker unless a com plete
set of and O-rings is available for re place ment.
DISASSEMBLY OF THE FRONTHEAD
Remove nut (25) and fronthead pinch bolt (24) from
the fronthead (3). Lightly tap the fronthead (using a
hide mallet if necessary) from the cylinder (1).
Press or drift out the two fronthead spring pins (22,
23) and remove the latch (6).
The plunger (20) and the plunger spring (21) can be
removed from the fronthead.
Handle Disassembly (BV and BS models)
Using a hide mallet tap loose and remove the muf fl er
(29) from the cylinder.
Firmly grip the cylinder upright in a vice with leath er
or copper covered jaws.
Loosen the four-handle nuts (27), unscrew and re-
move the four-handle screw's (26).
Lift the handle assembly (5) or (42) from the cyl in der
(1) (tap with a hide mallet if necessary).
For BV models only: Press or tap out the handle
pivot pin (12), remove both handle levers (8 and 9)
from the handle body (5) together with the trigger
(7). Tap out the sleeve (13) to detach the handle le-
vers from each other. Remove the handle springs
(11) from the handle body (5). If it is necessary to
remove the handle lever stop (14), use a punch of a
suitable size (∅15 to 19 mm) and drift the stop out
from the cylinder side.
It is possible to remove the trigger pin (15) at this
stage if required.
Unscrew the inlet bushing (18), and remove trig-
ger spring (17) the trigger ball (16) and throttle pin
(15).
Remove the handle screws (40) and washers (39)
(if fi tted) and remove the handle grips (10). It may
prove easier to cut off the old handle grips if they
are to be replaced.
For BS models only: Drift or press out the spring
pin (45) and remove the trigger lever (44)
The trigger pin (46) may be removed at this stage
if required.
Removal of the handle bar (43) from the casting
should not normally be necessary. If this is required
fi rst cut off the rubber hand-grips (10) and drift or
press out the lock spring pin (45). Securely support
the handle body (42) beneath a press and using a
suitably sized pressing bar press the handle bar out
of the handle body.
Unscrew the inlet bushing (18), and remove trig-
ger spring (17) the trigger ball (16) and trigger pin
(46).
Remove the handle screws (40) and washers (39)
and remove the handle grips (47). It may prove
easier to cut off the old handle grips if they are to
be replaced.
CYLINDER DISASSEMBLY
Remove the spacing washer (30) and valve plate (31).
Slide valve ring (34) from cylinder (1).
Remove sealing ring (28).
Release the cylinder from the vice, invert and allow
the piston (4) to slide out and be caught.
The nozzle (2) is pressed in the cylinder and re-
tained with Loctite 601 – do not disassemble unless
re place ment is necessary.
The cushion bushing (33) is pressed in the cylinder –
do not disassemble unless replacement is nec es sary.
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