Troubleshooting (Continued)

Problem

Cause

Correction

Loss of power in any one

Worn or damaged rod seals on

Repack cylinder. Rebuild cylinder,

cylinder, including lift

cylinder; external leaks

replacing damaged parts as necessary.

and crowd

 

 

Spool not moved to full stroke

Check spool travel - should be .26”

 

 

 

either way, or a total of .52”.

 

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 .26”

 

 

either way, or a total of .52”.

 

 

 

 

Relief valve setting in backhoe

Relief pressure will have to be checked

 

control valve too low or defective

and corrections made. Backhoe

 

 

system pressure is 2400 PSI. Relief

 

 

valve may need cleaning and over

 

 

hauling, or entire cartridge must be

 

 

replaced.

 

 

 

 

Worn control valve

Replace the control valve.

 

 

 

Maximum swing action

Bent piston rod in cylinder

Replace or rebuild the cylinder; replace

cannot be obtained

 

damaged parts.

 

Something jamming the swing

Remove interference.

 

linkage

 

 

 

 

Slow operation of machine

 

 

(lack of power) all cylinders

Low oil supply in reservoir

Fill to proper level.

 

 

 

 

Oil viscosity too heavy, or oil

Use recommended hydraulic fluid. Run

 

is not at operating temperature

machine until oil reaches operating

 

 

temperature.

 

Insufficient pumping

Advance engine throttle.

 

 

 

 

Diverter valve on prime mover

Diverter valve may need rebuilding or

 

leaking externally or bypassing

replacing.

 

oil internally through valve to

 

 

reservoir

 

 

Excessive back pressure

Relieve condition. Restriction may be

 

 

from outlet to reservoir.

19

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Bush Hog 2165 manual Troubleshooting

2165 specifications

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