Maintenance Section - Doosan DCT2PS Manual Del Usuario

WAR NIN G
Always wear eye protection when operating or
performing maintenance on this tool.
Always turn off the air supply and disconnect the air
supply hose before installing, removing or adjusting
any accessory on this tool or before performing any
maintenance on this tool.
DISASSEMBLY
General Instructions
1. Do not disassemble the tool any further than necessary to
replace or repair damaged parts.
2. When 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 tool unless you have a complete
set of new gaskets and O–rings for replacement.
5. Clean the exterior of the Pickhammer before disassembly.
6. Provide a clean work area for disassembling the
Pickhammer.
7. Handle all parts carefully. Hardened parts may chip or
break if dropped on a hard surface.
8. Probe all porting to loosen and clean out all foreign
matter. Place small parts in a clean box to prevent loss.
Disassembly of the Pickhammer
For DCT3PS and DCT5PS
1. Grasp the Handle (1) firmly in leather–covered or copper–
covered vise jaws with the Cylinder (22) upward and
remove handle locking screw (25).
CAUTI ON
Do not exert extreme pressure on the Handle.
The Handle can be cracked if the vise is tightened
excessively.
2. Using a large adjustable wrench on the flats of the
Cylinder, loosen the Cylinder.
NOT IC E
Do not loosen the Cylinder unless a new O–ring (11)
is available. This O–ring is usually damaged during
disassembly.

MAINTENANCE SECTION

3. Remove the Pickhammer from the vise and unscrew the
Cylinder from the Handle.
4. For Model DCT3PS, remove the Cylinder Spacer (12),
Washer Guide (13), Spring Washer Assembly (15), Piston
Shield (17) and Piston (21) from the Cylinder.
For Model DCT5PS, remove the Cylinder Spacer (12),
Upper Valve Seat (14), Valve (18), Lower Valve Seat (19),
Piston Bumper (16), two Valve Pins (20) and Piston (21)
from the Cylinder.
5. Remove the O–ring from the Cylinder.
6. For Model DCT5PS, press the Nozzle (23) from the
Cylinder if the Nozzle requires replacement.
7. Using a wrench, remove the Inlet Bushing Assembly (10)
from the Handle.
8. Remove the Throttle Valve Spring (9), Throttle Valve Pin
(8), Throttle Valve Face (7) and the Throttle Valve Stem
(6).
9. If the Throttle Valve Stem Bushing (5) requires
replacement, press the Throttle Lever Pin (3) from the
Handle and remove the Throttle Lever (2). Using an
arbor press and a rod that fits into the throttle lever slot,
press the Bushing out of the Handle through the Inlet
Bushing opening.
10. If the Throttle Valve Stem Bushing (5) requires
replacement, press the Throttle Lever Pin (3) from the
Handle, and remove the Safety Throttle Lever (1A).
Using an arbor press and a rod that fits into the throttle
lever slot, press the Bushing out of the Handle through
the Inlet Bushing opening.
11. If the Safety Lever (1B) requires replacement, press the
Safety Lever Pin (1C) from the Handle, and remove the
Safety Lever and the Safety Lever Spring.
For DCT2PS
1. Grasp the Handle (1) firmly in the leather–covered or
copper–covered vise jaws with Cylinder (19) upward.
Do not exert extreme pressure on the Handle.
The Handle can be cracked if the vise is
tightened excessively.
2. Remove the Retainer (29).
3. Remove the Deflector (28) from the Cylinder.
4. Remove the Handle Pin (25).
5. Using a large adjustable wrench on the flats of the
Cylinder, loosen the Cylinder.
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