Ingersoll Rand IR21BS Manual página 51

DISASSEMBLING THE IR21BV AND IR21BS PAVING BREAKER
GENERAL INSTRUCTIONS
• Clean the breaker outer surface.
• Do not disassemble the breaker any further than neces-
sary 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 prevent distortion. Take
extra care with threaded parts and housings.
• Do not remove any part that is a press fi t in or on a sub-
assembly unless the removal of the part is necessary for
repairs or replacement.
• Do not disassemble the breaker unless a complete set of
and O-rings is available for replacement.
DISASSEMBLY OF THE FRONTHEAD
Remove nut (25) and fronthead pinch bolt (24) from the front-
head (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 muffl er (29)
from the cylinder.
Firmly grip the cylinder upright in a vice with leather or
copper cover jaws. Loosen the four handle screws (26) and
remove nuts (27).
Lift the handle assembly (5) or (42) from the cylinder assem-
bly tap with a hide mallet to loosen if necessary.
For BV models only:
Press or tap out the handle pivot pin
(12) remove both handle lever (8 and 9) from the handle body
(5) together with the trigger (7).
Remove the handle springs (11) from their pockets.
Tap out the sleeve (13) to detach the handle levers from
each other. Remove the handle springs (11) from the handle
body (5).
If it is necessary to remove the handle stop (14), use a punch
of suitable size (15-19 mm dia.) and drift out the stop (14)
from the handle casting from the cylinder side.
It is possible at this stage to remove the trigger pin (15) if
reqiured.
Unscrew the inlet bushing (18), and remove trigger spring
(17), trigger ball (16) and throttle pin (15).
Unscrew and remove the oiler plug (39) and sealing washer
(38) and drain the oil in the reservoir into a suitable recep-
tacle for safe disposal.
Pry out the wick plug (37) from the base of the handle cast-
ing. Inspect the wick (36) and wick holder (35) if clean and
remove if necessary.
Remove the handle grips (10) if they are to be replaced it may
prove easier to cut the grips off.
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 (5) should
not normally be necessary. If it is necessary cut off the handle
grips (10) and drift or press out spring pin (48). Securely
support the handle body (42) beneath a press and using a
suitably sized pressing bar press out the handle bar (43) from
the handle body (5).
Unscrew the inlet bushing (18), and remove trigger spring
(17), trigger ball (16) and trigger pin (46).
Unscrew and remove the oiler plug (39) and sealing washer
(38) and drain the oil in the reservoir into a suitable recep-
tacle for safe disposal.
Pry out the wick plug (37) from the base of the handle cast-
ing. Inspect the wick (36) and wick holder (35) if clean and
remove if necessary.
Remove the handle grips (10) if they are to be replaced it may
prove easier to cut the grips off.
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 retained with
Loctite 601 – do not disassemble unless replacement is nec-
essary.
The cushion bushing (33) is pressed in the cylinder – do not
disassemble unless replacement is necessary.
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