Doosan DCT2PS Manual Del Usuario página 34

MAINTENANCE SECTION
TROUBLESHOOTING GUIDE
Trouble Probable Cause
Pickhammer will not start Plugged exhaust port or air
passages caused by dirt or hose
particles
Stuck valve due to gummy oil or
incorrect assembly
Frozen piston due to improper
lubrication
Restriction in the air hose
Pickhammer loses power rapidly
Air hose too long
Air Hose diameter too small
Clogged Inlet Bushing screen
Low air supply pressure
Pickhammer lacks power
Running on Fronthead cushion
Plugged air passages
Lack of lubricating oil
Clogged Inlet Bushing Screen
Tool not properly broken in
Cylinder overheating on new
Pickhammer
Running on Fronthead cushion
Tool overheating after break-in
period
Piston not hitting shank because
shank is short
Pulling steel at full throttle
Lack of lubricant or improper
lubricating oil
Lubricating oil too heavy, slowing
Erratic or sluggish operating down valve action
Gummed oil or dirt in operating
parts
Clogged Inlet Bushing screen
Excessive moisture in the air
Freezing at exhaust ports supply line (Usually occurs in low
ambient temperatures)
Excessive moisture in the air
Fogging supply line
Over lubrication
NOTIC E
SAVE THESE INSTRUCTIONS. DO NOT DESTROY.
Solution
Dismantle the Pickhammer and clean out all ports
and air passages. Keep the air hose in top notch
condition; never use a soft, deteriorated hose.
Remove and clean the valve chest parts. Never
use dirty oil or oil that does not conform to the
recommended specifications. Check for correct
valve assembly procedures.
Repair the piston by placing in a high speed lathe
and dressing with fine emery cloth.
Never run the Pickhammer without the
proper lubricating oil in the lubricator.
Never allow the air hose to kink or make
sharp bends.
As a general rule, keep the air hose length under
15 m (49 ft).
Use a 13 mm (1/2") inside diameter air
supply hose.
Clean the screen in the Inlet Bushing Assembly
The maximum air supply pressure at the tool
should be 6.2 bar (90 psig).
Keep shank fed-up to the work. Always
maintain a constant pressure when operating
the Pickhammer.
Disassemble the Pickhammer and clean out all
ports and passages.
Maintain the proper oil level in the lubricator.
Steel shank must show a film of oil.
Clean the screen in the Inlet Bushing Assembly.
Stop operating the tool and perform initial
servicing. Never run a new Pickhammer at full
throttle until a proper break-in period has been com-
pleted.
Keep shank fed-up to the work. Always
maintain a constant pressure when operating
the Pickhammer.
Remove the shank from the Pickhammer
Use minimum throttle when pulling steels away
from work.
Before operating the Pickhammer, make
sure the lubricating oil reservoir is full of
proper lubricant.
Use only the recommended lubricating oil.
Disassemble the tool and clean out dirt and
gummy residue. Service the Pickhammer with
clean oil. Protect the tool from dirt when idle.
Clean the screen in the Inlet Bushing Assembly.
Install moisture traps in the air supply line or
add anti-freeze lubricant directly through
the air inlet. Use anti-freeze lubricant.
Clean out the air lines. IF moisture traps
are installed in the air supply line, drain
the moisture.
Adjust the lubricator for the proper rate
lubricant feed.
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Models DCT2PS, DCT3PS and DCT5PS Pickhammers are designed for breaking concrete and other demoliti-
on work in construction applications.
HOW TO ORDER A PICKHAMMER
Model Impacts/min.
DCT2PS 2850
DCT3PS 3850
DCT5PS 2550
MODEL DCT2PS PICKHAMMER
MODEL
CPN MODEL
1 Grip Handle ...................... – • 18 Valve Pin ...........................
2 Throttle Lever .................. 88100904 19 Cylinder ............................
• 3 Throttle Lever Pin ............ 88098249 20 Piston ................................
• 4 Throttle Valve Face .......... 88099171 21 Nozzle ................................
5 Throttle Valve Seat .......... 88099189 25 Handle Lock Pin ...............
• 6 Throttle Valve Spring ....... 88099197 28 Deflector ............................
29 Retainer ............................
7 Valve Stopper.................... 88099205
• 8 Throttle Valve Stem ......... 88099213 • 30 Spacer Ring
9 Throttle Valve Stem Bush 88099221
10 Inlet Bushing .................... 88100912
• 12 Valve .................................. 88100938
*
13 Valve Box .......................... 25012543
• Indicates Tune-Up Kit Part
* Not Illustrated
PARTS
Piston Stroke
in mm
2 50
1–1/2 37
2–3/8 60
(Dwg. TPB996)
CPN
88099239
21867353
56752041
21867346
88099247
88098652
88102116
1 mm ................................. 88098702
1.5 mm .............................. 56746910
Nameplate ........................ 22112981
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