TROUBLESHOOTING (Continued)

Problem

Cause

Correction

Machine loses power after

Diverter valve on prime move

Diverter valve may need rebuilding or

operating satisfactorily

leaking or bypassing oil internally

replacing.

initially

through valve to reservoir

 

 

Excessive back pressure

Relieve condition. Restriction may be

 

 

from outlet to reservoir.

 

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.

 

 

 

Loss of power in lift or

Spool not moved to full stroke

Check spool travel- should be .26”

crowd cylinder, but other

 

either way, or a total of .52”.

cylinders function properly

 

 

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.

 

Problems involving the control

This valve is a precision device and is

 

valve

not intended for any extensive field

 

 

adjustment or repair. Field replace-

 

 

ment parts are limited to seal kits,

 

 

cartridges, valve sections and tie rods.

 

 

Replacement of these parts, the

 

 

opening of check cavities and certain

 

 

relief cavities to examine for trapped

 

 

dirt, or resetting of the main relief valve

 

 

with the use of good pressure gauge,

 

 

should be referred to qualified service

 

 

personnel.

 

 

Dirt and shreds of packing material are

 

 

the usual causes of valve malfunction.

 

 

Be sure the reservoir oil supply is kept

 

 

clean and only factory supplied

 

 

packings are used in cylinder repair.

 

 

Everything must be clean and free of

 

 

dirt during oil line removal and

 

 

replacement, and during any cylinder

 

 

work.

Loss of power in any one

Loose oil line connections,

Tighten all hose connections and

cylinder, including lift

leaks in line or broken lines

replace any damaged O-rings at

and crowd

 

leaking O-ring fittings. Check and

 

 

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.

 

 

18

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Bush Hog 2165 manual Troubleshooting

2165 specifications

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