Maintenance Section - Ingersoll Rand 772 Manual De Operación Y Mantenimiento

Always wear eye protection when operating or
performing maintenance on this tool.
Always turn off air supply and disconnect air supply
hose before installing, removing or adjusting any
accessory on this tool, or before performing any
maintenance on this tool.
LUBRICATION
Each time a Model 772 Air Hammer is disassembled for
maintenance, repair or replacement of parts, lubricate the
tool as follows:
Inject approximately 3 cc of oil into the air inlet and
operate the tool for 5 seconds to coat the internal parts
with oil.
DISASSEMBLY
General Instructions
1. Do not disassemble the tool any further than
necessary to replace or repair damaged parts.
2. Whenever grasping a tool or part in a vise, always use
leather–covered or copper–covered vise jaws to
protect the surface of the part and help prevent
distortion. This is particularly true of threaded
members and housings.
3. Do not remove any part which is a press fit in or on a
subassembly unless the removal of that part is
necessary for repairs or replacement.
4. Do not disassemble the Air Hammer unless you have
a complete set of new gaskets and O–rings for
replacement.
Disassembly of the Air Hammer
1. Remove the tool Retainer (16).
2. Slide the Exhaust Deflector (13) off the Barrel (15).
3. Clamp the flats of the Barrel in leather–covered or
copper–covered vise jaws with the Offset Handle
Assembly (1) upward.
4. Carefully unscrew the Handle.
5. Remove the Valve Cap (10), Valve (11), Valve Spacer
(9), Valve Seat (8), two Dowel Pins (12), and the
Piston (14).
Disassembly of the Throttle Mechanism
1. Unscrew the Throttle Valve Bushing Assembly and
withdraw the throttle mechanism. Remove the
Throttle Valve Spring (7).

MAINTENANCE SECTION

2.
3.
General Instructions
1.
2.
3.
Assembly of the Throttle Mechanism
1.
2.
3.
4.
Assembly of the Air Hammer
1.
2.
3.
4.
5.
6.
7.
15
Press the Throttle Valve (2) from the Throttle Valve
Button (4). Remove the Throttle Valve Bushing
Assembly from the Throttle Valve.
If required, remove the Throttle Valve Face (3) and
the Throttle Valve Bushing Seal (6).
ASSEMBLY
Whenever grasping a tool or part in a vise, always use
leather–covered or copper–covered vise jaws. Take
extra care with threaded parts and housings.
Always clean every part and wipe every part with a
thin film of oil before installation.
Apply a film of O–ring lubricant to all O–rings before
final assembly.
If required, replace the Throttle Seal Bushing Seal (6)
and the Throttle Valve Face (3) onto the Throttle
Valve Bushing Assembly (5).
Press the Throttle Valve (2) into the Throttle Valve
Button (4).
Clamp the Offset Handle Assembly (1) of the Air
Hammer in leather–covered or copper–covered vise
jaws with the opening upward.
Place the large end of the Throttle Valve Spring (7)
into the Offset Handle Assembly. Screw the Valve
Bushing Throttle Valve into the Handle and tighten
to 30 ft–lb minimum.
Clamp the Barrel (15) in leather–covered or
copper–covered vise jaws with the Handle end up.
Place the Piston (14) into the Barrel.
Place the Dowel Pins (12) into the dowel pin holes in
the Barrel.
With the Dowel Pins going through the dowel pin
holes in the Valve Seat (8) and Valve Spacer (9), place
the Seat and Spacer onto the Barrel.
Place the Valve (11) on the Valve Spacer.
With the Dowel Pins going through the dowel pin
holes in the Valve Cap (10), place the Cap on the
Barrel.
Screw the Offset Handle Assembly (1) onto the Barrel
tighten to 120 ft–lb (162 Nm) torque.