Troubleshooting (Continued)

 

 

 

 

 

 

 

 

 

 

 

 

Problem

 

Cause

 

Correction

 

 

 

 

 

 

Lift, crowd or bucket

 

Problems involving the control

 

Dirt and shreds of packing material are

 

 

 

 

 

 

 

 

 

 

 

 

cylinders drop under load

 

valve (cont.)

 

the usual causes of valve malfunction.

 

 

 

when control spools

 

 

 

 

 

Be sure the reservoir oil supply is kept

 

 

 

shifted from neutral

 

 

 

 

 

clean and only factory supplied packing

 

 

 

 

 

 

 

 

 

packings are used in cylinder repair.

 

 

 

 

 

 

 

 

 

Everything must be clean and free of

 

 

 

 

 

 

 

 

 

dirt during the oil line removal and

 

 

 

 

 

 

 

 

 

replacement, and during any cylinder

 

 

 

 

 

 

 

 

 

work.

 

 

 

Load drops or settles

 

Loose oil line connections,

 

Tighten all hose connections and replace

 

 

 

 

 

 

leaks in line or broken lines

 

replace any damaged o-rings at leaking

 

 

 

 

 

 

 

 

 

o-ring fittings. Check and replace any

 

 

 

 

 

 

 

 

 

damaged hoses and lines.

 

 

 

 

 

Oil is bypassing cylinder piston,

 

Replace or rebuild the cylinder; replace

 

 

 

 

 

 

scored piston, worn piston

 

damaged parts.

 

 

 

 

 

packing, or defective piston

 

 

 

 

 

 

 

 

 

 

 

 

 

 

assembly

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Worn or damaged rod seals on

 

Repack cylinder. Rebuild cylinder,

 

 

 

 

 

 

cylinder; external leaks

 

replacing damaged parts as necessary.

 

 

 

 

 

Worn control valve

 

Replace the control valve.

 

 

 

 

 

 

Damaged or worn spool seals

 

Replace spool end seals.

 

 

 

 

 

Leaky cylinders

 

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.

 

 

 

Leaky valve

 

Loose oil line connections,

 

Tighten all hose connections and

 

 

 

 

 

 

leaks in line or broken lines

 

replace any damaged O-rings at

 

 

 

 

 

 

 

 

 

leaking O-ring fittings. Check and

 

 

 

 

 

 

 

 

 

replace any damaged hoses and lines.

 

 

 

 

 

Excessive back pressure

 

Relieve condition. Restriction may be

 

 

 

 

 

 

 

 

 

 

from outlet to reservoir.

 

 

 

 

 

Paint on valve spool; sticking

 

Clean valve spool. Binding is usually

 

 

 

 

 

 

valve spool or scored valve

 

caused from an over tightened plug,

 

 

 

 

 

spool

 

mounting bolt, fitting in valve body or

 

 

 

 

 

 

 

 

 

tie rod bolt. If a plug or fitting in the

 

 

 

 

 

 

 

 

 

valve body is leaking, do not overtighten

 

 

 

 

 

 

 

 

 

in an effort to stop leak. This will distort

 

 

 

 

 

 

 

 

 

body casting and cause spools to bind.

 

 

 

 

 

 

 

 

 

(cont.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 24
Image 24
Bush Hog CBH80, CBH60, CBH70 manual Troubleshooting

CBH60, CBH70, CBH80 specifications

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