Bush Hog 2165 manual TROUBLESHOOTING Continued, Problem, Cause, Correction

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.

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