Troubleshooting (Continued)
Problem
Cause
Correction
Loss of power in any one
Scored piston rods and worn
Replace or rebuild the cylinder; replace
cylinder, including lift
guides in cylinder
damaged parts.
and crowd (cont.)
Bent piston rod in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Worn or damaged rod seals on
Repack cylinder. Rebuild cylinder,
cylinder; external leaks
replacing damaged parts as necessary.
Spool not moved to full stroke
Check spool travel - should be .16”
either way, or a total of .32” for CBH60.
Spool travel should be .28” either way,
or a total of .56” for CBH70 CBH80.
Overload relief valve in the control
Clean relief carefully but do not disturb
valve stuck open or malfunctioning
its pressure setting as it cannot be field
calibrated, or replace cartridge.
Worn control valve
Replace the control valve.
Loss of power in swing
Loose oil line connections,
Tighten all hose connections and
cylinders, but other
leaks in line or broken lines
replace any damaged O-rings at
cylinders functioning
leaking O-ring fittings. Check and
properly.
replace any damaged hoses and lines.
Restrictions in oil lines
Check and replace any damaged hoses
and lines. Check for pinched hoses.
Oil is bypassing cylinder piston,
Replace or rebuild the cylinder; replace
scored piston, worn piston
damaged parts.
packing, or defective piston
assembly
Scored piston rods and worn
Replace or rebuild the cylinder; replace
guides in cylinder
damaged parts.
Bent piston rod in cylinder
Replace or rebuild the cylinder; replace
damaged parts.
Worn or damaged rod seals on
Repack cylinder. Rebuild cylinder,
cylinder; external leaks
replacing damaged parts as necessary.
Spool not moved to full stroke
Check spool travel - should be .16”
either way, or a total of .32” for CBH60.
Spool travel should be .28” either way,
or a total of .56” for CBH70 CBH80.
Relief valve setting in backhoe
Relief pressure will have to be checked
control valve too low or
and corrections made. Backhoe
defective
system pressure is 2000 PSI (CBH60),
2250 PSI (CBH70), 2550 PSI (CBH80),
Relief valve may need cleaning and or
overhauling or entire cartridge must be
replaced.
Worn control valve
Replace the control valve.
20
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