Ingersoll-Rand IR12PS, Operation And Maintenance, Page: 51 / 56

51
GENERAL INSTRUCTIONS
• Clean the Pickhammer outer sur face.
• Do not disassemble the pick ham mer any fur ther than
necessary to re place or repair damaged or worn parts.
• Whenever grasping a pick ham mer or a part in a vice,
always use leath er or copper-covered vice jaws to pro tect
the surface of the part and help pre vent dis tor tion. Take
extra care with thread ed parts and hous ings.
• Do not remove any part that is a press fi t in or on a sub-
assembly unless the removal of the part is nec es sary for
repairs or re place ment.
• Do not disassemble the pick ham mer un less a com-
plete set of O-rings is available for re place ment.
DISASSEMBLY OF THE FRONTHEAD
Screw retainer models
Unscrew retainer (12) off the cylinder (1) and remove chis el
buffer (13) from inside retainer. Remove seal ring (8) from
its groove in the cylinder.
Latch retainer models
Remove nut (17) and fronthead pinch bolt (16) from the front-
head (15). Light ly tap the fronthead (using a hide mal let if
necessary) off the cylinder (1).
Press or drift out the two fronthead spring pins (18, 19) and
remove the latch lever (20).
The plunger (22) and plunger spring (21) can be re moved
from the front head.
MAIN DISASSEMBLY
Grip handle body (24) fi rmly in a vice (use leather or cop per
covered vice jaws).
Remove muffl er retaining clip (10) from its groove in the cyl-
in der (IR9PS mod els only).
Insert three or four pieces of thin sheet steel ap prox i mate ly
8 mm wide, be neath the retaining lip of the muffl er moul d ing
(9) (small diameter end). These will allow the rubber re tain ing
lip of the muffl er to slide along over the groove in the cylinder
and ease re mov al of the muffl er.
Slide off muffl er (9) over the cylinder exposing the cyl in der
fl ats.
Remove locking pin (7) from its hole in cylinder, the pin is
provided with an M4 internal thread to assist removal.
Remove the handle from the vice, invert the pick-
ham mer and grip the fl ats of the cylinder in the vice.
Use a pipe about 1.5 Meters long po si tioned through
the loop of the handle to fi rst loosen and then com-
plete ly un screw the handle as sem bly from the cylinder
and remove. – Warn ing – once the handle is un screwed
from the cyl in der the pis ton and valve parts will be free
to fall and could cause injury.
HANDLE DISASSEMBLY
Grip handle body (24) in leather or cop per covered vice jaws
and unscrew throt tle valve plug (29) using a 13 mm span-
ner.
Withdraw throttle spring (28), throttle ball (27) and throttle
pin (32).
Remove the trigger (25) by pressing or drifting out trig ger
pin (26).
Unscrew quick release coupling (31) from inlet bush ing
(30).
The inlet bushing (30) can be removed if required though it
is assembled into the handle using a high strength retainer
and disassembly is not normally necessary.
CYLINDER DISASSEMBLY
Remove the spacing washer (6) and valve plate (5).
Slide off valve ring (4) from cylinder (1).
Allow piston (3) to slide out of the cylinder bore and be
caught.
The nozzle (2) is pressed into the cylinder and re tained with
Loctite 601 – do not disassemble unless re place ment is nec-
es sary.
DISASSEMBLING THE IR9PS AND IR12PS PICKHAMMERS