PHQ250JHMAVL Jackleg MK 1 Parts and Repair Manual PDF

Page 37
Troubleshooting Guides
Problem Probable Cause Remedy
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Always blow the air hose.
Air line supply blocked
Check air connection screen.
104. Rock drill will not
start when throttle
handle is advanced.
Piston sticks air hissing past
Dirt in automatic valve assembly
or valve gummed by thick oil
Automatic valve flooded by
lubricant or gummed by grease.
Cylinder may be dented or
damaged. Replace cylinder at
the rockdrill shop. (SM 61-66)
Return drill to rock drill shop
to repair valve. (SM 53-56)
(SM 111)
Ice in the muffler or exhaust ports (SM 106)
Damaged front cylinder washer
Hone or ream front cylinder
washer or replace. (SM 63-66)
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Lubricant too heavy (thick) for the
(SM 111).
ambient operating temperature.
105. Rock drill runs
erratically or lacks
power during drilling
operations.
Penetration is erratic or
slower than normal.
Improper amount of lubricant. (SM 111).
Valve chest sticking
Side rods tightened unevenly
Parts broken inside the drill.
Pawls and springs worn out
Insufficient air supply to leg (SM 112).
Check parts for sharp edges.
Check operation (SM 53-56)
Relax side rod nuts; re-tighten
properly (SM 85).
Replace broken parts at the
rockdrill to shop
Replace broken parts at the
rockdrill to shop (SM 80)
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106. Water coming out of the
exhaust ports on the drill.
Rockdrill freezing up and
the muffler or exhaust ports Excess water in the air
are blocked with ice. entering the rock drill
Excess fogging in the work
place area.
Install water trap in pipeline.
Blow moisture out of hoses.
Check water tube for breakage
cracks or missing rubber seal.
Check the O-Ring (164231)
inside the Backhead (SM 87)
Water pressure must be less
than air pressure by 30 psi.
Version 200711