SUNWARD SWDE200B - Unintended Machine Actions; Pilot Valve Staff Issues; Abnormal Sounds, Shocks, Smells

SWDE120A DOWN-THE-HOLE DRILLING RIG OPERATOR’S MANUAL BOOK
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93
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No action or slow action of
cylinder
1．Relevant pilot valve malfunction.
2．Relevant direction control valve
malfunction
3．Relevant overload valve
malfunction.
4．Hydraulic cylinder staff damaged
5．Hydraulic cylinder oil sealer
damaged
1．Repair
2．Contact with local distributor.
3．Contact with local distributor.
4．Contact with local distributor.
5．Change oil sealer.
Engine stop, no action or slow
action of pilot controlled valve.
1． No pressure or not enough
pressure of bag type accumulator.
2． One way valve leaks oil.
1．Add nitrogen
2．Check valve holes
One side of crawlers not moving
or slow moving (Moving
deflective)
1．Control pilot valve malfunction
2．Relevant direction control valve
and brake valve malfunction
3．Central connector oil sealer
damage
4．Hydraulic motor malfunction
5．Travel reducer malfunction
6．Displacement of Double
hydraulic pump is unequal
1．Repair
2．Contact with local distributor
3．Contact with local distributor
4．Contact with local distributor
Hydraulic oil temperature raising
too quickly or too high.
1．Oil cooler surface is dirty
2．Hydraulic parts abrasion, capacity
efficiency decreases
3．Relief valve and overload valves
are started too frequently.
1．Wash them.
2．Contact with local distributor
3．Change drilling method.
Certain action without operating
joystick
1．Main control valve staff is stuck
2．Main control valve core is stuck
1． Contact with local distributor
2． Contact with local distributor
Pilot valve top staff leaving out
Post hole sealer on pilot valve top
staff is damaged or aged.
Check and change.
Abnormal sound, shock, smell
Air or oil is aged, degenerative.
Pay frequent attention and change it
in time