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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 22
Image 22
Bush Hog CBH60, CBH80, CBH70 manual Troubleshooting

CBH60, CBH70, CBH80 specifications

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Another key characteristic of the CBH models is their user-friendly design. The intuitive controls allow for easy operation, making it accessible even for those who may not have extensive experience with machinery. The cutting decks feature a quick-release mechanism, streamlining maintenance and facilitating blade changes when necessary.

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